Merge branch 'search-bar-first-iteration' into 'master'

Search bar first iteration

Closes #21747

See merge request !7345

26 files changed, 2157 insertions, 18 deletions

diff --git a/app/assets/javascripts/application.js b/app/assets/javascripts/application.js
index e43afbb4cc9..f0615481ed2 100644
--- a/app/assets/javascripts/application.js
+++ b/app/assets/javascripts/application.js
@@ -58,6 +58,7 @@
 /*= require_directory ./extensions */
 /*= require_directory ./lib/utils */
 /*= require_directory ./u2f */
+/*= require_directory ./droplab */
 /*= require_directory . */
 /*= require fuzzaldrin-plus */
 /*= require es6-promise.auto */
diff --git a/app/assets/javascripts/dispatcher.js.es6 b/app/assets/javascripts/dispatcher.js.es6
index 54f13e328bd..99a34651639 100644
--- a/app/assets/javascripts/dispatcher.js.es6
+++ b/app/assets/javascripts/dispatcher.js.es6
@@ -84,6 +84,9 @@
           break;
         case 'projects:merge_requests:index':
         case 'projects:issues:index':
+          if (gl.FilteredSearchManager) {
+            new gl.FilteredSearchManager();
+          }
           Issuable.init();
           new gl.IssuableBulkActions({
             prefixId: page === 'projects:merge_requests:index' ? 'merge_request_' : 'issue_',
diff --git a/app/assets/javascripts/droplab/droplab.js b/app/assets/javascripts/droplab/droplab.js
new file mode 100644
index 00000000000..ed545ec8748
--- /dev/null
+++ b/app/assets/javascripts/droplab/droplab.js
@@ -0,0 +1,701 @@
+/* eslint-disable */
+// Determine where to place this
+if (typeof Object.assign != 'function') {
+  Object.assign = function (target, varArgs) { // .length of function is 2
+    'use strict';
+    if (target == null) { // TypeError if undefined or null
+      throw new TypeError('Cannot convert undefined or null to object');
+    }
+
+    var to = Object(target);
+
+    for (var index = 1; index < arguments.length; index++) {
+      var nextSource = arguments[index];
+
+      if (nextSource != null) { // Skip over if undefined or null
+        for (var nextKey in nextSource) {
+          // Avoid bugs when hasOwnProperty is shadowed
+          if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
+            to[nextKey] = nextSource[nextKey];
+          }
+        }
+      }
+    }
+    return to;
+  };
+}
+
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.droplab = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+var DATA_TRIGGER = 'data-dropdown-trigger';
+var DATA_DROPDOWN = 'data-dropdown';
+
+module.exports = {
+  DATA_TRIGGER: DATA_TRIGGER,
+  DATA_DROPDOWN: DATA_DROPDOWN,
+}
+
+},{}],2:[function(require,module,exports){
+// Custom event support for IE
+if ( typeof CustomEvent === "function" ) {
+  module.exports = CustomEvent;
+} else {
+  require('./window')(function(w){
+    var CustomEvent = function ( event, params ) {
+      params = params || { bubbles: false, cancelable: false, detail: undefined };
+      var evt = document.createEvent( 'CustomEvent' );
+      evt.initCustomEvent( event, params.bubbles, params.cancelable, params.detail );
+      return evt;
+    }
+    CustomEvent.prototype = w.Event.prototype;
+
+    w.CustomEvent = CustomEvent;
+  });
+  module.exports = CustomEvent;
+}
+
+},{"./window":11}],3:[function(require,module,exports){
+var CustomEvent = require('./custom_event_polyfill');
+var utils = require('./utils');
+
+var DropDown = function(list) {
+  this.hidden = true;
+  this.list = list;
+  this.items = [];
+  this.getItems();
+  this.addEvents();
+  this.initialState = list.innerHTML;
+};
+
+Object.assign(DropDown.prototype, {
+  getItems: function() {
+    this.items = [].slice.call(this.list.querySelectorAll('li'));
+    return this.items;
+  },
+
+  clickEvent: function(e) {
+    // climb up the tree to find the LI
+    var selected = utils.closest(e.target, 'LI');
+
+    if(selected) {
+      e.preventDefault();
+      this.hide();
+      var listEvent = new CustomEvent('click.dl', {
+        detail: {
+          list: this,
+          selected: selected,
+          data: e.target.dataset,
+        },
+      });
+      this.list.dispatchEvent(listEvent);
+    }
+  },
+
+  addEvents: function() {
+    this.clickWrapper = this.clickEvent.bind(this);
+    // event delegation.
+    this.list.addEventListener('click', this.clickWrapper);
+  },
+
+  toggle: function() {
+    if(this.hidden) {
+      this.show();
+    } else {
+      this.hide();
+    }
+  },
+
+  setData: function(data) {
+    this.data = data;
+    this.render(data);
+  },
+
+  addData: function(data) {
+    this.data = (this.data || []).concat(data);
+    this.render(data);
+  },
+
+  // call render manually on data;
+  render: function(data){
+    // debugger
+    // empty the list first
+    var sampleItem;
+    var newChildren = [];
+    var toAppend;
+
+    for(var i = 0; i < this.items.length; i++) {
+      var item = this.items[i];
+      sampleItem = item;
+      if(item.parentNode && item.parentNode.dataset.hasOwnProperty('dynamic')) {
+        item.parentNode.removeChild(item);  
+      }
+    }
+
+    newChildren = this.data.map(function(dat){
+      var html = utils.t(sampleItem.outerHTML, dat);
+      var template = document.createElement('div');
+      template.innerHTML = html;
+      // console.log(template.content)
+
+      // Help set the image src template
+      var imageTags = template.querySelectorAll('img[data-src]');
+      // debugger
+      for(var i = 0; i < imageTags.length; i++) {
+        var imageTag = imageTags[i];
+        imageTag.src = imageTag.getAttribute('data-src');
+        imageTag.removeAttribute('data-src');
+      }
+
+      if(dat.hasOwnProperty('droplab_hidden') && dat.droplab_hidden){
+        template.firstChild.style.display = 'none'
+      }else{
+        template.firstChild.style.display = 'block';
+      }
+      return template.firstChild.outerHTML;
+    });
+    toAppend = this.list.querySelector('ul[data-dynamic]');
+    if(toAppend) {
+      toAppend.innerHTML = newChildren.join('');
+    } else {
+      this.list.innerHTML = newChildren.join('');  
+    }
+  },
+
+  show: function() {
+    // debugger
+    this.list.style.display = 'block';
+    this.hidden = false;
+  },
+
+  hide: function() {
+    // debugger
+    this.list.style.display = 'none';
+    this.hidden = true;
+  },
+
+  destroy: function() {
+    if (!this.hidden) {
+      this.hide();
+    }
+
+    this.list.removeEventListener('click', this.clickWrapper);
+  }
+});
+
+module.exports = DropDown;
+
+},{"./custom_event_polyfill":2,"./utils":10}],4:[function(require,module,exports){
+require('./window')(function(w){
+  module.exports = function(deps) {
+    deps = deps || {};
+    var window = deps.window || w;
+    var document = deps.document || window.document;
+    var CustomEvent = deps.CustomEvent || require('./custom_event_polyfill');
+    var HookButton = deps.HookButton || require('./hook_button');
+    var HookInput = deps.HookInput || require('./hook_input');
+    var utils = deps.utils || require('./utils');
+    var DATA_TRIGGER = require('./constants').DATA_TRIGGER;
+
+    var DropLab = function(hook){
+      if (!(this instanceof DropLab)) return new DropLab(hook);
+      this.ready = false;
+      this.hooks = [];
+      this.queuedData = [];
+      this.config = {};
+      this.loadWrapper;
+      if(typeof hook !== 'undefined'){
+        this.addHook(hook);
+      }
+    };
+
+
+    Object.assign(DropLab.prototype, {
+      load: function() {
+        this.loadWrapper();
+      },
+
+      loadWrapper: function(){
+        var dropdownTriggers = [].slice.apply(document.querySelectorAll('['+DATA_TRIGGER+']'));
+        this.addHooks(dropdownTriggers).init();
+      },
+
+      addData: function () {
+        var args = [].slice.apply(arguments);
+        this.applyArgs(args, '_addData');
+      },
+
+      setData: function() {
+        var args = [].slice.apply(arguments);
+        this.applyArgs(args, '_setData');
+      },
+
+      destroy: function() {
+        for(var i = 0; i < this.hooks.length; i++) {
+          this.hooks[i].destroy();
+        }
+        this.hooks = [];
+        this.removeEvents();
+      },
+
+      applyArgs: function(args, methodName) {
+        if(this.ready) {
+          this[methodName].apply(this, args);
+        } else {
+          this.queuedData = this.queuedData || [];
+          this.queuedData.push(args);
+        }
+      },
+
+      _addData: function(trigger, data) {
+        this._processData(trigger, data, 'addData');
+      },
+
+      _setData: function(trigger, data) {
+        this._processData(trigger, data, 'setData');
+      },
+
+      _processData: function(trigger, data, methodName) {
+        for(var i = 0; i < this.hooks.length; i++) {
+          var hook = this.hooks[i];
+          if(hook.trigger.dataset.hasOwnProperty('id')) {
+            if(hook.trigger.dataset.id === trigger) {
+              hook.list[methodName](data);
+            }
+          }
+        }
+      },
+
+      addEvents: function() {
+        var self = this;
+        this.windowClickedWrapper = function(e){
+          var thisTag = e.target;
+          if(thisTag.tagName !== 'UL'){
+            // climb up the tree to find the UL
+            thisTag = utils.closest(thisTag, 'UL');
+          }
+          if(utils.isDropDownParts(thisTag)){ return }
+          if(utils.isDropDownParts(e.target)){ return }
+          for(var i = 0; i < self.hooks.length; i++) {
+            self.hooks[i].list.hide();
+          }
+        }.bind(this);
+        w.addEventListener('click', this.windowClickedWrapper);
+      },
+
+      removeEvents: function(){
+        w.removeEventListener('click', this.windowClickedWrapper);
+        w.removeEventListener('load', this.loadWrapper);
+      },
+
+      changeHookList: function(trigger, list, plugins, config) {
+        trigger = document.querySelector('[data-id="'+trigger+'"]');
+        // list = document.querySelector(list);
+        this.hooks.every(function(hook, i) {
+          if(hook.trigger === trigger) {
+            hook.destroy();
+            this.hooks.splice(i, 1);
+            this.addHook(trigger, list, plugins, config);
+            return false;
+          }
+          return true
+        }.bind(this));
+      },
+
+      addHook: function(hook, list, plugins, config) {
+        if(!(hook instanceof HTMLElement) && typeof hook === 'string'){
+          hook = document.querySelector(hook);
+        }
+        if(!list){
+          list = document.querySelector(hook.dataset[utils.toDataCamelCase(DATA_TRIGGER)]);
+        }
+        
+        if(hook) {
+          if(hook.tagName === 'A' || hook.tagName === 'BUTTON') {
+            this.hooks.push(new HookButton(hook, list, plugins, config));
+          } else if(hook.tagName === 'INPUT') {
+            this.hooks.push(new HookInput(hook, list, plugins, config));
+          }
+        }
+        return this;
+      },
+
+      addHooks: function(hooks, plugins, config) {
+        for(var i = 0; i < hooks.length; i++) {
+          var hook = hooks[i];
+          this.addHook(hook, null, plugins, config);
+        }
+        return this;
+      },
+
+      setConfig: function(obj){
+        this.config = obj;
+      },
+
+      init: function () {
+        this.addEvents();
+        var readyEvent = new CustomEvent('ready.dl', {
+          detail: {
+            dropdown: this,
+          },
+        });
+        window.dispatchEvent(readyEvent);
+        this.ready = true;
+        for(var i = 0; i < this.queuedData.length; i++) {
+          this.addData.apply(this, this.queuedData[i]);
+        }
+        this.queuedData = [];
+        return this;
+      },
+    });
+
+    return DropLab;
+  };
+});
+
+},{"./constants":1,"./custom_event_polyfill":2,"./hook_button":6,"./hook_input":7,"./utils":10,"./window":11}],5:[function(require,module,exports){
+var DropDown = require('./dropdown');
+
+var Hook = function(trigger, list, plugins, config){
+  this.trigger = trigger;
+  this.list = new DropDown(list);
+  this.type = 'Hook';
+  this.event = 'click';
+  this.plugins = plugins || [];
+  this.config = config || {};
+  this.id = trigger.dataset.id;
+};
+
+Object.assign(Hook.prototype, {
+
+  addEvents: function(){},
+
+  constructor: Hook,
+});
+
+module.exports = Hook;
+
+},{"./dropdown":3}],6:[function(require,module,exports){
+var CustomEvent = require('./custom_event_polyfill');
+var Hook = require('./hook');
+
+var HookButton = function(trigger, list, plugins, config) {
+  Hook.call(this, trigger, list, plugins, config);
+  this.type = 'button';
+  this.event = 'click';
+  this.addEvents();
+  this.addPlugins();
+};
+
+HookButton.prototype = Object.create(Hook.prototype);
+
+Object.assign(HookButton.prototype, {
+  addPlugins: function() {
+    for(var i = 0; i < this.plugins.length; i++) {
+      this.plugins[i].init(this);
+    }
+  },
+
+  clicked: function(e){
+    var buttonEvent = new CustomEvent('click.dl', {
+      detail: {
+        hook: this,
+      },
+      bubbles: true,
+      cancelable: true
+    });
+    this.list.show();
+    e.target.dispatchEvent(buttonEvent);
+  },
+
+  addEvents: function(){
+    this.clickedWrapper = this.clicked.bind(this);
+    this.trigger.addEventListener('click', this.clickedWrapper);
+  },
+
+  removeEvents: function(){
+    this.trigger.removeEventListener('click', this.clickedWrapper);
+  },
+
+  restoreInitialState: function() {
+    this.list.list.innerHTML = this.list.initialState;
+  },
+
+  removePlugins: function() {
+    for(var i = 0; i < this.plugins.length; i++) {
+      this.plugins[i].destroy();
+    }
+  },
+
+  destroy: function() {
+    this.restoreInitialState();
+    this.removeEvents();
+    this.removePlugins();
+  },
+
+
+  constructor: HookButton,
+});
+
+
+module.exports = HookButton;
+
+},{"./custom_event_polyfill":2,"./hook":5}],7:[function(require,module,exports){
+var CustomEvent = require('./custom_event_polyfill');
+var Hook = require('./hook');
+
+var HookInput = function(trigger, list, plugins, config) {
+  Hook.call(this, trigger, list, plugins, config);
+  this.type = 'input';
+  this.event = 'input';
+  this.addPlugins();
+  this.addEvents();
+};
+
+Object.assign(HookInput.prototype, {
+  addPlugins: function() {
+    var self = this;
+    for(var i = 0; i < this.plugins.length; i++) {
+      this.plugins[i].init(self);
+    }
+  },
+
+  addEvents: function(){
+    var self = this;
+
+    this.mousedown = function mousedown(e) {
+      var mouseEvent = new CustomEvent('mousedown.dl', {
+        detail: {
+          hook: self,
+          text: e.target.value,
+        },
+        bubbles: true,
+        cancelable: true
+      });
+      e.target.dispatchEvent(mouseEvent);
+    }
+
+    this.input = function input(e) {
+      var inputEvent = new CustomEvent('input.dl', {
+        detail: {
+          hook: self,
+          text: e.target.value,
+        },
+        bubbles: true,
+        cancelable: true
+      });
+      e.target.dispatchEvent(inputEvent);
+      self.list.show();
+    }
+
+    this.keyup = function keyup(e) {
+      keyEvent(e, 'keyup.dl');
+    }
+
+    this.keydown = function keydown(e) {
+      keyEvent(e, 'keydown.dl');
+    }
+
+    function keyEvent(e, keyEventName){
+      var keyEvent = new CustomEvent(keyEventName, {
+        detail: {
+          hook: self,
+          text: e.target.value,
+          which: e.which,
+          key: e.key,
+        },
+        bubbles: true,
+        cancelable: true
+      });
+      e.target.dispatchEvent(keyEvent);
+      self.list.show();
+    }
+
+    this.events = this.events || {};
+    this.events.mousedown = this.mousedown;
+    this.events.input = this.input;
+    this.events.keyup = this.keyup;
+    this.events.keydown = this.keydown;
+    this.trigger.addEventListener('mousedown', this.mousedown);
+    this.trigger.addEventListener('input', this.input);
+    this.trigger.addEventListener('keyup', this.keyup);
+    this.trigger.addEventListener('keydown', this.keydown);
+  },
+
+  removeEvents: function(){
+    this.trigger.removeEventListener('mousedown', this.mousedown);
+    this.trigger.removeEventListener('input', this.input);
+    this.trigger.removeEventListener('keyup', this.keyup);
+    this.trigger.removeEventListener('keydown', this.keydown);
+  },
+
+  restoreInitialState: function() {
+    this.list.list.innerHTML = this.list.initialState;
+  },
+
+  removePlugins: function() {
+    for(var i = 0; i < this.plugins.length; i++) {
+      this.plugins[i].destroy();
+    }
+  },
+
+  destroy: function() {
+    this.restoreInitialState();
+    this.removeEvents();
+    this.removePlugins();
+    this.list.destroy();
+  }
+});
+
+module.exports = HookInput;
+
+},{"./custom_event_polyfill":2,"./hook":5}],8:[function(require,module,exports){
+var DropLab = require('./droplab')();
+var DATA_TRIGGER = require('./constants').DATA_TRIGGER;
+var keyboard = require('./keyboard')();
+var setup = function() {
+  window.DropLab = DropLab;
+};
+
+
+module.exports = setup();
+
+},{"./constants":1,"./droplab":4,"./keyboard":9}],9:[function(require,module,exports){
+require('./window')(function(w){
+  module.exports = function(){
+    var currentKey;
+    var currentFocus;
+    var currentIndex = 0;
+    var isUpArrow = false;
+    var isDownArrow = false;
+    var removeHighlight = function removeHighlight(list) {
+      var listItems = list.list.querySelectorAll('li');
+      for(var i = 0; i < listItems.length; i++) {
+        listItems[i].classList.remove('dropdown-active');
+      }
+      return listItems;
+    };
+
+    var setMenuForArrows = function setMenuForArrows(list) {
+      var listItems = removeHighlight(list);
+      if(currentIndex>0){
+        if(!listItems[currentIndex-1]){
+          currentIndex = currentIndex-1; 
+        }
+        listItems[currentIndex-1].classList.add('dropdown-active');
+      }
+    };
+
+    var mousedown = function mousedown(e) {
+      var list = e.detail.hook.list;
+      removeHighlight(list);
+      list.show();
+      currentIndex = 0;
+      isUpArrow = false;
+      isDownArrow = false;
+    };
+    var selectItem = function selectItem(list) {
+      var listItems = removeHighlight(list);
+      var currentItem = listItems[currentIndex-1];
+      var listEvent = new CustomEvent('click.dl', {
+        detail: {
+          list: list,
+          selected: currentItem,
+          data: currentItem.dataset,
+        },
+      });
+      list.list.dispatchEvent(listEvent);
+      list.hide();
+    }
+
+    var keydown = function keydown(e){
+      var typedOn = e.target;
+      isUpArrow = false;
+      isDownArrow = false;
+
+      if(e.detail.which){
+        currentKey = e.detail.which;
+        if(currentKey === 13){
+          selectItem(e.detail.hook.list);
+          return;
+        }
+        if(currentKey === 38) {
+          isUpArrow = true;
+        }
+        if(currentKey === 40) {
+          isDownArrow = true;
+        }
+      } else if(e.detail.key) {
+        currentKey = e.detail.key;
+        if(currentKey === 'Enter'){
+          selectItem(e.detail.hook.list);
+          return;
+        }
+        if(currentKey === 'ArrowUp') {
+          isUpArrow = true; 
+        }
+        if(currentKey === 'ArrowDown') {
+          isDownArrow = true;
+        }
+      }
+      if(isUpArrow){ currentIndex--; }
+      if(isDownArrow){ currentIndex++; }
+      if(currentIndex < 0){ currentIndex = 0; }
+      setMenuForArrows(e.detail.hook.list);
+    };
+
+    w.addEventListener('mousedown.dl', mousedown);
+    w.addEventListener('keydown.dl', keydown);
+  };
+});
+},{"./window":11}],10:[function(require,module,exports){
+var DATA_TRIGGER = require('./constants').DATA_TRIGGER;
+var DATA_DROPDOWN = require('./constants').DATA_DROPDOWN;
+
+var toDataCamelCase = function(attr){
+  return this.camelize(attr.split('-').slice(1).join(' '));
+};
+
+// the tiniest damn templating I can do
+var t = function(s,d){
+  for(var p in d)
+    s=s.replace(new RegExp('{{'+p+'}}','g'), d[p]);
+  return s;
+};
+
+var camelize = function(str) {
+  return str.replace(/(?:^\w|[A-Z]|\b\w)/g, function(letter, index) {
+    return index == 0 ? letter.toLowerCase() : letter.toUpperCase();
+  }).replace(/\s+/g, '');
+};
+
+var closest = function(thisTag, stopTag) {
+  while(thisTag.tagName !== stopTag && thisTag.tagName !== 'HTML'){
+    thisTag = thisTag.parentNode;
+  }
+  return thisTag;
+};
+
+var isDropDownParts = function(target) {
+  if(target.tagName === 'HTML') { return false; }
+  return (
+    target.hasAttribute(DATA_TRIGGER) || 
+      target.hasAttribute(DATA_DROPDOWN)
+  );
+};
+
+module.exports = {
+  toDataCamelCase: toDataCamelCase,
+  t: t,
+  camelize: camelize,
+  closest: closest,
+  isDropDownParts: isDropDownParts,
+};
+
+},{"./constants":1}],11:[function(require,module,exports){
+module.exports = function(callback) {
+  return (function() {
+    callback(this);
+  }).call(null);
+};
+
+},{}]},{},[8])(8)
+});
diff --git a/app/assets/javascripts/droplab/droplab_ajax.js b/app/assets/javascripts/droplab/droplab_ajax.js
new file mode 100644
index 00000000000..f20610b3811
--- /dev/null
+++ b/app/assets/javascripts/droplab/droplab_ajax.js
@@ -0,0 +1,79 @@
+/* eslint-disable */
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g=(g.droplab||(g.droplab = {}));g=(g.ajax||(g.ajax = {}));g=(g.datasource||(g.datasource = {}));g.js = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+/* global droplab */
+
+require('../window')(function(w){
+  function droplabAjaxException(message) {
+    this.message = message;
+  }
+
+  w.droplabAjax = {
+    _loadUrlData: function _loadUrlData(url) {
+      return new Promise(function(resolve, reject) {
+        var xhr = new XMLHttpRequest;
+        xhr.open('GET', url, true);
+        xhr.onreadystatechange = function () {
+          if(xhr.readyState === XMLHttpRequest.DONE) {
+            if (xhr.status === 200) {
+              var data = JSON.parse(xhr.responseText);
+              return resolve(data);
+            } else {
+              return reject([xhr.responseText, xhr.status]);
+            }
+          }
+        };
+        xhr.send();
+      });
+    },
+
+    init: function init(hook) {
+      var self = this;
+      var config = hook.config.droplabAjax;
+
+      if (!config || !config.endpoint || !config.method) {
+        return;
+      }
+
+      if (config.method !== 'setData' && config.method !== 'addData') {
+        return;
+      }
+
+      if (config.loadingTemplate) {
+        var dynamicList = hook.list.list.querySelector('[data-dynamic]');
+
+        var loadingTemplate = document.createElement('div');
+        loadingTemplate.innerHTML = config.loadingTemplate;
+        loadingTemplate.setAttribute('data-loading-template', '');
+
+        this.listTemplate = dynamicList.outerHTML;
+        dynamicList.outerHTML = loadingTemplate.outerHTML;
+      }
+
+      this._loadUrlData(config.endpoint)
+        .then(function(d) {
+          if (config.loadingTemplate) {
+            var dataLoadingTemplate = hook.list.list.querySelector('[data-loading-template]');
+
+            if (dataLoadingTemplate) {
+              dataLoadingTemplate.outerHTML = self.listTemplate;
+            }
+          }
+          hook.list[config.method].call(hook.list, d);
+        }).catch(function(e) {
+          throw new droplabAjaxException(e.message || e);
+        });
+    },
+
+    destroy: function() {
+    }
+  };
+});
+},{"../window":2}],2:[function(require,module,exports){
+module.exports = function(callback) {
+  return (function() {
+    callback(this);
+  }).call(null);
+};
+
+},{}]},{},[1])(1)
+});
\ No newline at end of file
diff --git a/app/assets/javascripts/droplab/droplab_ajax_filter.js b/app/assets/javascripts/droplab/droplab_ajax_filter.js
new file mode 100644
index 00000000000..af163f76851
--- /dev/null
+++ b/app/assets/javascripts/droplab/droplab_ajax_filter.js
@@ -0,0 +1,145 @@
+/* eslint-disable */
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g=(g.droplab||(g.droplab = {}));g=(g.ajax||(g.ajax = {}));g=(g.datasource||(g.datasource = {}));g.js = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+/* global droplab */
+
+require('../window')(function(w){
+  w.droplabAjaxFilter = {
+    init: function(hook) {
+      this.destroyed = false;
+      this.hook = hook;
+      this.notLoading();
+
+      this.debounceTriggerWrapper = this.debounceTrigger.bind(this);
+      this.hook.trigger.addEventListener('keydown.dl', this.debounceTriggerWrapper);
+      this.hook.trigger.addEventListener('focus', this.debounceTriggerWrapper);
+      this.trigger(true);
+    },
+
+    notLoading: function notLoading() {
+      this.loading = false;
+    },
+
+    debounceTrigger: function debounceTrigger(e) {
+      var NON_CHARACTER_KEYS = [16, 17, 18, 20, 37, 38, 39, 40, 91, 93];
+      var invalidKeyPressed = NON_CHARACTER_KEYS.indexOf(e.detail.which || e.detail.keyCode) > -1;
+      var focusEvent = e.type === 'focus';
+
+      if (invalidKeyPressed || this.loading) {
+        return;
+      }
+
+      if (this.timeout) {
+        clearTimeout(this.timeout);
+      }
+
+      this.timeout = setTimeout(this.trigger.bind(this, focusEvent), 200);
+    },
+
+    trigger: function trigger(getEntireList) {
+      var config = this.hook.config.droplabAjaxFilter;
+      var searchValue = this.trigger.value;
+
+      if (!config || !config.endpoint || !config.searchKey) {
+        return;
+      }
+
+      if (config.searchValueFunction) {
+        searchValue = config.searchValueFunction();
+      }
+
+      if (config.loadingTemplate && this.hook.list.data === undefined ||
+        this.hook.list.data.length === 0) {
+        var dynamicList = this.hook.list.list.querySelector('[data-dynamic]');
+
+        var loadingTemplate = document.createElement('div');
+        loadingTemplate.innerHTML = config.loadingTemplate;
+        loadingTemplate.setAttribute('data-loading-template', true);
+
+        this.listTemplate = dynamicList.outerHTML;
+        dynamicList.outerHTML = loadingTemplate.outerHTML;
+      }
+
+      if (getEntireList) {
+        searchValue = '';
+      }
+
+      if (config.searchKey === searchValue) {
+        return this.list.show();
+      }
+
+      this.loading = true;
+
+      var params = config.params || {};
+      params[config.searchKey] = searchValue;
+      var self = this;
+      this._loadUrlData(config.endpoint + this.buildParams(params)).then(function(data) {
+        if (config.loadingTemplate && self.hook.list.data === undefined ||
+          self.hook.list.data.length === 0) {
+          const dataLoadingTemplate = self.hook.list.list.querySelector('[data-loading-template]');
+
+          if (dataLoadingTemplate) {
+            dataLoadingTemplate.outerHTML = self.listTemplate;
+          }
+        }
+
+        if (!self.destroyed) {
+          var hookListChildren = self.hook.list.list.children;
+          var onlyDynamicList = hookListChildren.length === 1 && hookListChildren[0].hasAttribute('data-dynamic');
+
+          if (onlyDynamicList && data.length === 0) {
+            self.hook.list.hide();
+          }
+
+          self.hook.list.setData.call(self.hook.list, data);
+        }
+        self.notLoading();
+      });
+    },
+
+    _loadUrlData: function _loadUrlData(url) {
+      return new Promise(function(resolve, reject) {
+        var xhr = new XMLHttpRequest;
+        xhr.open('GET', url, true);
+        xhr.onreadystatechange = function () {
+          if(xhr.readyState === XMLHttpRequest.DONE) {
+            if (xhr.status === 200) {
+              var data = JSON.parse(xhr.responseText);
+              return resolve(data);
+            } else {
+              return reject([xhr.responseText, xhr.status]);
+            }
+          }
+        };
+        xhr.send();
+      });
+    },
+
+    buildParams: function(params) {
+      if (!params) return '';
+      var paramsArray = Object.keys(params).map(function(param) {
+        return param + '=' + (params[param] || '');
+      });
+      return '?' + paramsArray.join('&');
+    },
+
+    destroy: function destroy() {
+      if (this.timeout) {
+        clearTimeout(this.timeout);
+      }
+
+      this.destroyed = true;
+
+      this.hook.trigger.removeEventListener('keydown.dl', this.debounceTriggerWrapper);
+      this.hook.trigger.removeEventListener('focus', this.debounceTriggerWrapper);
+    }
+  };
+});
+},{"../window":2}],2:[function(require,module,exports){
+module.exports = function(callback) {
+  return (function() {
+    callback(this);
+  }).call(null);
+};
+
+},{}]},{},[1])(1)
+});
\ No newline at end of file
diff --git a/app/assets/javascripts/droplab/droplab_filter.js b/app/assets/javascripts/droplab/droplab_filter.js
new file mode 100644
index 00000000000..41a220831f9
--- /dev/null
+++ b/app/assets/javascripts/droplab/droplab_filter.js
@@ -0,0 +1,60 @@
+/* eslint-disable */
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g=(g.droplab||(g.droplab = {}));g=(g.filter||(g.filter = {}));g.js = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+/* global droplab */
+
+require('../window')(function(w){
+  w.droplabFilter = {
+
+    keydownWrapper: function(e){
+        var list = e.detail.hook.list;
+        var data = list.data;
+        var value = e.detail.hook.trigger.value.toLowerCase();
+        var config = e.detail.hook.config.droplabFilter;
+        var matches = [];
+        var filterFunction;
+        // will only work on dynamically set data
+        if(!data){
+          return;
+        }
+
+        if (config && config.filterFunction && typeof config.filterFunction === 'function') {
+          filterFunction = config.filterFunction;
+        } else {
+          filterFunction = function(o){
+            // cheap string search
+            o.droplab_hidden = o[config.template].toLowerCase().indexOf(value) === -1;
+            return o;
+          };
+        }
+
+        matches = data.map(function(o) {
+          return filterFunction(o, value);
+        });
+        list.render(matches);
+    },
+
+    init: function init(hookInput) {
+      var config = hookInput.config.droplabFilter;
+
+      if (!config || (!config.template && !config.filterFunction)) {
+        return;
+      }
+
+      this.hookInput = hookInput;
+      this.hookInput.trigger.addEventListener('keyup.dl', this.keydownWrapper);
+    },
+
+    destroy: function destroy(){
+      this.hookInput.trigger.removeEventListener('keyup.dl', this.keydownWrapper);
+    }
+  };
+});
+},{"../window":2}],2:[function(require,module,exports){
+module.exports = function(callback) {
+  return (function() {
+    callback(this);
+  }).call(null);
+};
+
+},{}]},{},[1])(1)
+});
\ No newline at end of file
diff --git a/app/assets/javascripts/filtered_search/dropdown_hint.js.es6 b/app/assets/javascripts/filtered_search/dropdown_hint.js.es6
new file mode 100644
index 00000000000..63c20f57520
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/dropdown_hint.js.es6
@@ -0,0 +1,66 @@
+/*= require filtered_search/filtered_search_dropdown */
+
+/* global droplabFilter */
+
+(() => {
+  class DropdownHint extends gl.FilteredSearchDropdown {
+    constructor(droplab, dropdown, input, filter) {
+      super(droplab, dropdown, input, filter);
+      this.config = {
+        droplabFilter: {
+          template: 'hint',
+          filterFunction: gl.DropdownUtils.filterHint,
+        },
+      };
+    }
+
+    itemClicked(e) {
+      const { selected } = e.detail;
+
+      if (selected.tagName === 'LI') {
+        if (selected.hasAttribute('data-value')) {
+          this.dismissDropdown();
+        } else {
+          const token = selected.querySelector('.js-filter-hint').innerText.trim();
+          const tag = selected.querySelector('.js-filter-tag').innerText.trim();
+
+          if (tag.length) {
+            gl.FilteredSearchDropdownManager.addWordToInput(token.replace(':', ''));
+          }
+          this.dismissDropdown();
+          this.dispatchInputEvent();
+        }
+      }
+    }
+
+    renderContent() {
+      const dropdownData = [{
+        icon: 'fa-pencil',
+        hint: 'author:',
+        tag: '&lt;@author&gt;',
+      }, {
+        icon: 'fa-user',
+        hint: 'assignee:',
+        tag: '&lt;@assignee&gt;',
+      }, {
+        icon: 'fa-clock-o',
+        hint: 'milestone:',
+        tag: '&lt;%milestone&gt;',
+      }, {
+        icon: 'fa-tag',
+        hint: 'label:',
+        tag: '&lt;~label&gt;',
+      }];
+
+      this.droplab.changeHookList(this.hookId, this.dropdown, [droplabFilter], this.config);
+      this.droplab.setData(this.hookId, dropdownData);
+    }
+
+    init() {
+      this.droplab.addHook(this.input, this.dropdown, [droplabFilter], this.config).init();
+    }
+  }
+
+  window.gl = window.gl || {};
+  gl.DropdownHint = DropdownHint;
+})();
diff --git a/app/assets/javascripts/filtered_search/dropdown_non_user.js.es6 b/app/assets/javascripts/filtered_search/dropdown_non_user.js.es6
new file mode 100644
index 00000000000..f06c3fc9c6f
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/dropdown_non_user.js.es6
@@ -0,0 +1,44 @@
+/*= require filtered_search/filtered_search_dropdown */
+
+/* global droplabAjax */
+/* global droplabFilter */
+
+(() => {
+  class DropdownNonUser extends gl.FilteredSearchDropdown {
+    constructor(droplab, dropdown, input, filter, endpoint, symbol) {
+      super(droplab, dropdown, input, filter);
+      this.symbol = symbol;
+      this.config = {
+        droplabAjax: {
+          endpoint,
+          method: 'setData',
+          loadingTemplate: this.loadingTemplate,
+        },
+        droplabFilter: {
+          filterFunction: gl.DropdownUtils.filterWithSymbol.bind(null, this.symbol),
+        },
+      };
+    }
+
+    itemClicked(e) {
+      super.itemClicked(e, (selected) => {
+        const title = selected.querySelector('.js-data-value').innerText.trim();
+        return `${this.symbol}${gl.DropdownUtils.getEscapedText(title)}`;
+      });
+    }
+
+    renderContent(forceShowList = false) {
+      this.droplab
+        .changeHookList(this.hookId, this.dropdown, [droplabAjax, droplabFilter], this.config);
+      super.renderContent(forceShowList);
+    }
+
+    init() {
+      this.droplab
+        .addHook(this.input, this.dropdown, [droplabAjax, droplabFilter], this.config).init();
+    }
+  }
+
+  window.gl = window.gl || {};
+  gl.DropdownNonUser = DropdownNonUser;
+})();
diff --git a/app/assets/javascripts/filtered_search/dropdown_user.js.es6 b/app/assets/javascripts/filtered_search/dropdown_user.js.es6
new file mode 100644
index 00000000000..e80d266ae89
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/dropdown_user.js.es6
@@ -0,0 +1,53 @@
+/*= require filtered_search/filtered_search_dropdown */
+
+/* global droplabAjaxFilter */
+
+(() => {
+  class DropdownUser extends gl.FilteredSearchDropdown {
+    constructor(droplab, dropdown, input, filter) {
+      super(droplab, dropdown, input, filter);
+      this.config = {
+        droplabAjaxFilter: {
+          endpoint: '/autocomplete/users.json',
+          searchKey: 'search',
+          params: {
+            per_page: 20,
+            active: true,
+            project_id: this.getProjectId(),
+            current_user: true,
+          },
+          searchValueFunction: this.getSearchInput.bind(this),
+          loadingTemplate: this.loadingTemplate,
+        },
+      };
+    }
+
+    itemClicked(e) {
+      super.itemClicked(e,
+        selected => selected.querySelector('.dropdown-light-content').innerText.trim());
+    }
+
+    renderContent(forceShowList = false) {
+      this.droplab.changeHookList(this.hookId, this.dropdown, [droplabAjaxFilter], this.config);
+      super.renderContent(forceShowList);
+    }
+
+    getProjectId() {
+      return this.input.getAttribute('data-project-id');
+    }
+
+    getSearchInput() {
+      const query = this.input.value.trim();
+      const { lastToken } = gl.FilteredSearchTokenizer.processTokens(query);
+
+      return lastToken.value || '';
+    }
+
+    init() {
+      this.droplab.addHook(this.input, this.dropdown, [droplabAjaxFilter], this.config).init();
+    }
+  }
+
+  window.gl = window.gl || {};
+  gl.DropdownUser = DropdownUser;
+})();
diff --git a/app/assets/javascripts/filtered_search/dropdown_utils.js.es6 b/app/assets/javascripts/filtered_search/dropdown_utils.js.es6
new file mode 100644
index 00000000000..c27ef3042d1
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/dropdown_utils.js.es6
@@ -0,0 +1,79 @@
+(() => {
+  class DropdownUtils {
+    static getEscapedText(text) {
+      let escapedText = text;
+      const hasSpace = text.indexOf(' ') !== -1;
+      const hasDoubleQuote = text.indexOf('"') !== -1;
+
+      // Encapsulate value with quotes if it has spaces
+      // Known side effect: values's with both single and double quotes
+      // won't escape properly
+      if (hasSpace) {
+        if (hasDoubleQuote) {
+          escapedText = `'${text}'`;
+        } else {
+          // Encapsulate singleQuotes or if it hasSpace
+          escapedText = `"${text}"`;
+        }
+      }
+
+      return escapedText;
+    }
+
+    static filterWithSymbol(filterSymbol, item, query) {
+      const updatedItem = item;
+      const { lastToken, searchToken } = gl.FilteredSearchTokenizer.processTokens(query);
+
+      if (lastToken !== searchToken) {
+        const title = updatedItem.title.toLowerCase();
+        let value = lastToken.value.toLowerCase();
+
+        if ((value[0] === '"' || value[0] === '\'') && title.indexOf(' ') !== -1) {
+          value = value.slice(1);
+        }
+
+        // Eg. filterSymbol = ~ for labels
+        const matchWithoutSymbol = lastToken.symbol === filterSymbol && title.indexOf(value) !== -1;
+        const match = title.indexOf(`${lastToken.symbol}${value}`) !== -1;
+
+        updatedItem.droplab_hidden = !match && !matchWithoutSymbol;
+      } else {
+        updatedItem.droplab_hidden = false;
+      }
+
+      return updatedItem;
+    }
+
+    static filterHint(item, query) {
+      const updatedItem = item;
+      let { lastToken } = gl.FilteredSearchTokenizer.processTokens(query);
+      lastToken = lastToken.key || lastToken || '';
+
+      if (!lastToken || query.split('').last() === ' ') {
+        updatedItem.droplab_hidden = false;
+      } else if (lastToken) {
+        const split = lastToken.split(':');
+        const tokenName = split[0].split(' ').last();
+
+        const match = updatedItem.hint.indexOf(tokenName.toLowerCase()) === -1;
+        updatedItem.droplab_hidden = tokenName ? match : false;
+      }
+
+      return updatedItem;
+    }
+
+    static setDataValueIfSelected(filter, selected) {
+      const dataValue = selected.getAttribute('data-value');
+
+      if (dataValue) {
+        gl.FilteredSearchDropdownManager.addWordToInput(filter, dataValue);
+      }
+
+      // Return boolean based on whether it was set
+      return dataValue !== null;
+    }
+  }
+
+  window.gl = window.gl || {};
+  gl.DropdownUtils = DropdownUtils;
+})();
diff --git a/app/assets/javascripts/filtered_search/filtered_search_bundle.js b/app/assets/javascripts/filtered_search/filtered_search_bundle.js
new file mode 100644
index 00000000000..d188718c5f3
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/filtered_search_bundle.js
@@ -0,0 +1,7 @@
+ // This is a manifest file that'll be compiled into including all the files listed below.
+ // Add new JavaScript code in separate files in this directory and they'll automatically
+ // be included in the compiled file accessible from http://example.com/assets/application.js
+ // It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
+ // the compiled file.
+ //
+ /*= require_tree . */
diff --git a/app/assets/javascripts/filtered_search/filtered_search_dropdown.js.es6 b/app/assets/javascripts/filtered_search/filtered_search_dropdown.js.es6
new file mode 100644
index 00000000000..886d8113f4a
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/filtered_search_dropdown.js.es6
@@ -0,0 +1,102 @@
+(() => {
+  const DATA_DROPDOWN_TRIGGER = 'data-dropdown-trigger';
+
+  class FilteredSearchDropdown {
+    constructor(droplab, dropdown, input, filter) {
+      this.droplab = droplab;
+      this.hookId = input.getAttribute('data-id');
+      this.input = input;
+      this.filter = filter;
+      this.dropdown = dropdown;
+      this.loadingTemplate = `<div class="filter-dropdown-loading">
+        <i class="fa fa-spinner fa-spin"></i>
+      </div>`;
+      this.bindEvents();
+    }
+
+    bindEvents() {
+      this.itemClickedWrapper = this.itemClicked.bind(this);
+      this.dropdown.addEventListener('click.dl', this.itemClickedWrapper);
+    }
+
+    unbindEvents() {
+      this.dropdown.removeEventListener('click.dl', this.itemClickedWrapper);
+    }
+
+    getCurrentHook() {
+      return this.droplab.hooks.filter(h => h.id === this.hookId)[0] || null;
+    }
+
+    itemClicked(e, getValueFunction) {
+      const { selected } = e.detail;
+
+      if (selected.tagName === 'LI' && selected.innerHTML) {
+        const dataValueSet = gl.DropdownUtils.setDataValueIfSelected(this.filter, selected);
+
+        if (!dataValueSet) {
+          const value = getValueFunction(selected);
+          gl.FilteredSearchDropdownManager.addWordToInput(this.filter, value);
+        }
+
+        this.dismissDropdown();
+      }
+    }
+
+    setAsDropdown() {
+      this.input.setAttribute(DATA_DROPDOWN_TRIGGER, `#${this.dropdown.id}`);
+    }
+
+    setOffset(offset = 0) {
+      this.dropdown.style.left = `${offset}px`;
+    }
+
+    renderContent(forceShowList = false) {
+      if (forceShowList && this.getCurrentHook().list.hidden) {
+        this.getCurrentHook().list.show();
+      }
+    }
+
+    render(forceRenderContent = false, forceShowList = false) {
+      this.setAsDropdown();
+
+      const currentHook = this.getCurrentHook();
+      const firstTimeInitialized = currentHook === null;
+
+      if (firstTimeInitialized || forceRenderContent) {
+        this.renderContent(forceShowList);
+      } else if (currentHook.list.list.id !== this.dropdown.id) {
+        this.renderContent(forceShowList);
+      }
+    }
+
+    dismissDropdown() {
+      // Focusing on the input will dismiss dropdown
+      // (default droplab functionality)
+      this.input.focus();
+    }
+
+    dispatchInputEvent() {
+      // Propogate input change to FilteredSearchDropdownManager
+      // so that it can determine which dropdowns to open
+      this.input.dispatchEvent(new Event('input'));
+    }
+
+    hideDropdown() {
+      this.getCurrentHook().list.hide();
+    }
+
+    resetFilters() {
+      const hook = this.getCurrentHook();
+      const data = hook.list.data;
+      const results = data.map((o) => {
+        const updated = o;
+        updated.droplab_hidden = false;
+        return updated;
+      });
+      hook.list.render(results);
+    }
+  }
+
+  window.gl = window.gl || {};
+  gl.FilteredSearchDropdown = FilteredSearchDropdown;
+})();
diff --git a/app/assets/javascripts/filtered_search/filtered_search_dropdown_manager.js.es6 b/app/assets/javascripts/filtered_search/filtered_search_dropdown_manager.js.es6
new file mode 100644
index 00000000000..1cd0483877a
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/filtered_search_dropdown_manager.js.es6
@@ -0,0 +1,193 @@
+/* global DropLab */
+
+(() => {
+  class FilteredSearchDropdownManager {
+    constructor() {
+      this.tokenizer = gl.FilteredSearchTokenizer;
+      this.filteredSearchInput = document.querySelector('.filtered-search');
+
+      this.setupMapping();
+
+      this.cleanupWrapper = this.cleanup.bind(this);
+      document.addEventListener('page:fetch', this.cleanupWrapper);
+    }
+
+    cleanup() {
+      if (this.droplab) {
+        this.droplab.destroy();
+        this.droplab = null;
+      }
+
+      this.setupMapping();
+
+      document.removeEventListener('page:fetch', this.cleanupWrapper);
+    }
+
+    setupMapping() {
+      this.mapping = {
+        author: {
+          reference: null,
+          gl: 'DropdownUser',
+          element: document.querySelector('#js-dropdown-author'),
+        },
+        assignee: {
+          reference: null,
+          gl: 'DropdownUser',
+          element: document.querySelector('#js-dropdown-assignee'),
+        },
+        milestone: {
+          reference: null,
+          gl: 'DropdownNonUser',
+          extraArguments: ['milestones.json', '%'],
+          element: document.querySelector('#js-dropdown-milestone'),
+        },
+        label: {
+          reference: null,
+          gl: 'DropdownNonUser',
+          extraArguments: ['labels.json', '~'],
+          element: document.querySelector('#js-dropdown-label'),
+        },
+        hint: {
+          reference: null,
+          gl: 'DropdownHint',
+          element: document.querySelector('#js-dropdown-hint'),
+        },
+      };
+    }
+
+    static addWordToInput(tokenName, tokenValue = '') {
+      const input = document.querySelector('.filtered-search');
+      const word = `${tokenName}:${tokenValue}`;
+
+      const { lastToken, searchToken } = gl.FilteredSearchTokenizer.processTokens(input.value);
+      const lastSearchToken = searchToken.split(' ').last();
+      const lastInputCharacter = input.value[input.value.length - 1];
+      const lastInputTrimmedCharacter = input.value.trim()[input.value.trim().length - 1];
+
+      // Remove the typed tokenName
+      if (word.indexOf(lastSearchToken) === 0 && searchToken !== '') {
+        // Remove spaces after the colon
+        if (lastInputCharacter === ' ' && lastInputTrimmedCharacter === ':') {
+          input.value = input.value.trim();
+        }
+
+        input.value = input.value.slice(0, -1 * lastSearchToken.length);
+      } else if (lastInputCharacter !== ' ' || (lastToken && lastToken.value[lastToken.value.length - 1] === ' ')) {
+        // Remove the existing tokenValue
+        const lastTokenString = `${lastToken.key}:${lastToken.symbol}${lastToken.value}`;
+        input.value = input.value.slice(0, -1 * lastTokenString.length);
+      }
+
+      input.value += word;
+    }
+
+    updateCurrentDropdownOffset() {
+      this.updateDropdownOffset(this.currentDropdown);
+    }
+
+    updateDropdownOffset(key) {
+      if (!this.font) {
+        this.font = window.getComputedStyle(this.filteredSearchInput).font;
+      }
+
+      const filterIconPadding = 27;
+      const offset = gl.text
+        .getTextWidth(this.filteredSearchInput.value, this.font) + filterIconPadding;
+
+      this.mapping[key].reference.setOffset(offset);
+    }
+
+    load(key, firstLoad = false) {
+      const mappingKey = this.mapping[key];
+      const glClass = mappingKey.gl;
+      const element = mappingKey.element;
+      let forceShowList = false;
+
+      if (!mappingKey.reference) {
+        const dl = this.droplab;
+        const defaultArguments = [null, dl, element, this.filteredSearchInput, key];
+        const glArguments = defaultArguments.concat(mappingKey.extraArguments || []);
+
+        // Passing glArguments to `new gl[glClass](<arguments>)`
+        mappingKey.reference = new (Function.prototype.bind.apply(gl[glClass], glArguments))();
+      }
+
+      if (firstLoad) {
+        mappingKey.reference.init();
+      }
+
+      if (this.currentDropdown === 'hint') {
+        // Force the dropdown to show if it was clicked from the hint dropdown
+        forceShowList = true;
+      }
+
+      this.updateDropdownOffset(key);
+      mappingKey.reference.render(firstLoad, forceShowList);
+
+      this.currentDropdown = key;
+    }
+
+    loadDropdown(dropdownName = '') {
+      let firstLoad = false;
+
+      if (!this.droplab) {
+        firstLoad = true;
+        this.droplab = new DropLab();
+      }
+
+      const match = gl.FilteredSearchTokenKeys.searchByKey(dropdownName.toLowerCase());
+      const shouldOpenFilterDropdown = match && this.currentDropdown !== match.key
+        && this.mapping[match.key];
+      const shouldOpenHintDropdown = !match && this.currentDropdown !== 'hint';
+
+      if (shouldOpenFilterDropdown || shouldOpenHintDropdown) {
+        const key = match && match.key ? match.key : 'hint';
+        this.load(key, firstLoad);
+      }
+    }
+
+    setDropdown() {
+      const { lastToken, searchToken } = this.tokenizer
+        .processTokens(this.filteredSearchInput.value);
+
+      if (this.filteredSearchInput.value.split('').last() === ' ') {
+        this.updateCurrentDropdownOffset();
+      }
+
+      if (lastToken === searchToken && lastToken !== null) {
+        // Token is not fully initialized yet because it has no value
+        // Eg. token = 'label:'
+
+        const split = lastToken.split(':');
+        const dropdownName = split[0].split(' ').last();
+        this.loadDropdown(split.length > 1 ? dropdownName : '');
+      } else if (lastToken) {
+        // Token has been initialized into an object because it has a value
+        this.loadDropdown(lastToken.key);
+      } else {
+        this.loadDropdown('hint');
+      }
+    }
+
+    resetDropdowns() {
+      // Force current dropdown to hide
+      this.mapping[this.currentDropdown].reference.hideDropdown();
+
+      // Re-Load dropdown
+      this.setDropdown();
+
+      // Reset filters for current dropdown
+      this.mapping[this.currentDropdown].reference.resetFilters();
+
+      // Reposition dropdown so that it is aligned with cursor
+      this.updateDropdownOffset(this.currentDropdown);
+    }
+
+    destroyDroplab() {
+      this.droplab.destroy();
+    }
+  }
+
+  window.gl = window.gl || {};
+  gl.FilteredSearchDropdownManager = FilteredSearchDropdownManager;
+})();
diff --git a/app/assets/javascripts/filtered_search/filtered_search_manager.js.es6 b/app/assets/javascripts/filtered_search/filtered_search_manager.js.es6
new file mode 100644
index 00000000000..ffd0d7e9cba
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/filtered_search_manager.js.es6
@@ -0,0 +1,171 @@
+/* global Turbolinks */
+
+(() => {
+  class FilteredSearchManager {
+    constructor() {
+      this.filteredSearchInput = document.querySelector('.filtered-search');
+      this.clearSearchButton = document.querySelector('.clear-search');
+
+      if (this.filteredSearchInput) {
+        this.tokenizer = gl.FilteredSearchTokenizer;
+        this.dropdownManager = new gl.FilteredSearchDropdownManager();
+
+        this.bindEvents();
+        this.loadSearchParamsFromURL();
+        this.dropdownManager.setDropdown();
+
+        this.cleanupWrapper = this.cleanup.bind(this);
+        document.addEventListener('page:fetch', this.cleanupWrapper);
+      }
+    }
+
+    cleanup() {
+      this.unbindEvents();
+      document.removeEventListener('page:fetch', this.cleanupWrapper);
+    }
+
+    bindEvents() {
+      this.setDropdownWrapper = this.dropdownManager.setDropdown.bind(this.dropdownManager);
+      this.toggleClearSearchButtonWrapper = this.toggleClearSearchButton.bind(this);
+      this.checkForEnterWrapper = this.checkForEnter.bind(this);
+      this.clearSearchWrapper = this.clearSearch.bind(this);
+      this.checkForBackspaceWrapper = this.checkForBackspace.bind(this);
+
+      this.filteredSearchInput.addEventListener('input', this.setDropdownWrapper);
+      this.filteredSearchInput.addEventListener('input', this.toggleClearSearchButtonWrapper);
+      this.filteredSearchInput.addEventListener('keydown', this.checkForEnterWrapper);
+      this.filteredSearchInput.addEventListener('keyup', this.checkForBackspaceWrapper);
+      this.clearSearchButton.addEventListener('click', this.clearSearchWrapper);
+    }
+
+    unbindEvents() {
+      this.filteredSearchInput.removeEventListener('input', this.setDropdownWrapper);
+      this.filteredSearchInput.removeEventListener('input', this.toggleClearSearchButtonWrapper);
+      this.filteredSearchInput.removeEventListener('keydown', this.checkForEnterWrapper);
+      this.filteredSearchInput.removeEventListener('keyup', this.checkForBackspaceWrapper);
+      this.clearSearchButton.removeEventListener('click', this.clearSearchWrapper);
+    }
+
+    checkForBackspace(e) {
+      // 8 = Backspace Key
+      // 46 = Delete Key
+      if (e.keyCode === 8 || e.keyCode === 46) {
+        // Reposition dropdown so that it is aligned with cursor
+        this.dropdownManager.updateCurrentDropdownOffset();
+      }
+    }
+
+    checkForEnter(e) {
+      if (e.keyCode === 13) {
+        e.preventDefault();
+
+        // Prevent droplab from opening dropdown
+        this.dropdownManager.destroyDroplab();
+
+        this.search();
+      }
+    }
+
+    toggleClearSearchButton(e) {
+      if (e.target.value) {
+        this.clearSearchButton.classList.remove('hidden');
+      } else {
+        this.clearSearchButton.classList.add('hidden');
+      }
+    }
+
+    clearSearch(e) {
+      e.preventDefault();
+
+      this.filteredSearchInput.value = '';
+      this.clearSearchButton.classList.add('hidden');
+
+      this.dropdownManager.resetDropdowns();
+    }
+
+    loadSearchParamsFromURL() {
+      const params = gl.utils.getUrlParamsArray();
+      const inputValues = [];
+
+      params.forEach((p) => {
+        const split = p.split('=');
+        const keyParam = decodeURIComponent(split[0]);
+        const value = split[1];
+
+        // Check if it matches edge conditions listed in gl.FilteredSearchTokenKeys
+        const condition = gl.FilteredSearchTokenKeys.searchByConditionUrl(p);
+
+        if (condition) {
+          inputValues.push(`${condition.tokenKey}:${condition.value}`);
+        } else {
+          // Sanitize value since URL converts spaces into +
+          // Replace before decode so that we know what was originally + versus the encoded +
+          const sanitizedValue = value ? decodeURIComponent(value.replace(/\+/g, ' ')) : value;
+          const match = gl.FilteredSearchTokenKeys.searchByKeyParam(keyParam);
+
+          if (match) {
+            const indexOf = keyParam.indexOf('_');
+            const sanitizedKey = indexOf !== -1 ? keyParam.slice(0, keyParam.indexOf('_')) : keyParam;
+            const symbol = match.symbol;
+            let quotationsToUse = '';
+
+            if (sanitizedValue.indexOf(' ') !== -1) {
+              // Prefer ", but use ' if required
+              quotationsToUse = sanitizedValue.indexOf('"') === -1 ? '"' : '\'';
+            }
+
+            inputValues.push(`${sanitizedKey}:${symbol}${quotationsToUse}${sanitizedValue}${quotationsToUse}`);
+          } else if (!match && keyParam === 'search') {
+            inputValues.push(sanitizedValue);
+          }
+        }
+      });
+
+      // Trim the last space value
+      this.filteredSearchInput.value = inputValues.join(' ');
+
+      if (inputValues.length > 0) {
+        this.clearSearchButton.classList.remove('hidden');
+      }
+    }
+
+    search() {
+      const paths = [];
+      const { tokens, searchToken } = this.tokenizer.processTokens(this.filteredSearchInput.value);
+      const currentState = gl.utils.getParameterByName('state') || 'opened';
+      paths.push(`state=${currentState}`);
+
+      tokens.forEach((token) => {
+        const condition = gl.FilteredSearchTokenKeys
+          .searchByConditionKeyValue(token.key, token.value.toLowerCase());
+        const { param } = gl.FilteredSearchTokenKeys.searchByKey(token.key);
+        const keyParam = param ? `${token.key}_${param}` : token.key;
+        let tokenPath = '';
+
+        if (condition) {
+          tokenPath = condition.url;
+        } else {
+          let tokenValue = token.value;
+
+          if ((tokenValue[0] === '\'' && tokenValue[tokenValue.length - 1] === '\'') ||
+            (tokenValue[0] === '"' && tokenValue[tokenValue.length - 1] === '"')) {
+            tokenValue = tokenValue.slice(1, tokenValue.length - 1);
+          }
+
+          tokenPath = `${keyParam}=${encodeURIComponent(tokenValue)}`;
+        }
+
+        paths.push(tokenPath);
+      });
+
+      if (searchToken) {
+        paths.push(`search=${encodeURIComponent(searchToken)}`);
+      }
+
+      Turbolinks.visit(`?scope=all&utf8=✓&${paths.join('&')}`);
+    }
+  }
+
+  window.gl = window.gl || {};
+  gl.FilteredSearchManager = FilteredSearchManager;
+})();
diff --git a/app/assets/javascripts/filtered_search/filtered_search_token_keys.js.es6 b/app/assets/javascripts/filtered_search/filtered_search_token_keys.js.es6
new file mode 100644
index 00000000000..e46373024b6
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/filtered_search_token_keys.js.es6
@@ -0,0 +1,83 @@
+(() => {
+  const tokenKeys = [{
+    key: 'author',
+    type: 'string',
+    param: 'username',
+    symbol: '@',
+  }, {
+    key: 'assignee',
+    type: 'string',
+    param: 'username',
+    symbol: '@',
+  }, {
+    key: 'milestone',
+    type: 'string',
+    param: 'title',
+    symbol: '%',
+  }, {
+    key: 'label',
+    type: 'array',
+    param: 'name[]',
+    symbol: '~',
+  }];
+
+  const conditions = [{
+    url: 'assignee_id=0',
+    tokenKey: 'assignee',
+    value: 'none',
+  }, {
+    url: 'milestone_title=No+Milestone',
+    tokenKey: 'milestone',
+    value: 'none',
+  }, {
+    url: 'milestone_title=%23upcoming',
+    tokenKey: 'milestone',
+    value: 'upcoming',
+  }, {
+    url: 'label_name[]=No+Label',
+    tokenKey: 'label',
+    value: 'none',
+  }];
+
+  class FilteredSearchTokenKeys {
+    static get() {
+      return tokenKeys;
+    }
+
+    static getConditions() {
+      return conditions;
+    }
+
+    static searchByKey(key) {
+      return tokenKeys.find(tokenKey => tokenKey.key === key) || null;
+    }
+
+    static searchBySymbol(symbol) {
+      return tokenKeys.find(tokenKey => tokenKey.symbol === symbol) || null;
+    }
+
+    static searchByKeyParam(keyParam) {
+      return tokenKeys.find((tokenKey) => {
+        let tokenKeyParam = tokenKey.key;
+
+        if (tokenKey.param) {
+          tokenKeyParam += `_${tokenKey.param}`;
+        }
+
+        return keyParam === tokenKeyParam;
+      }) || null;
+    }
+
+    static searchByConditionUrl(url) {
+      return conditions.find(condition => condition.url === url) || null;
+    }
+
+    static searchByConditionKeyValue(key, value) {
+      return conditions
+        .find(condition => condition.tokenKey === key && condition.value === value) || null;
+    }
+  }
+
+  window.gl = window.gl || {};
+  gl.FilteredSearchTokenKeys = FilteredSearchTokenKeys;
+})();
diff --git a/app/assets/javascripts/filtered_search/filtered_search_tokenizer.js.es6 b/app/assets/javascripts/filtered_search/filtered_search_tokenizer.js.es6
new file mode 100644
index 00000000000..cf53845a48b
--- /dev/null
+++ b/app/assets/javascripts/filtered_search/filtered_search_tokenizer.js.es6
@@ -0,0 +1,45 @@
+(() => {
+  class FilteredSearchTokenizer {
+    static processTokens(input) {
+      // Regex extracts `(token):(symbol)(value)`
+      // Values that start with a double quote must end in a double quote (same for single)
+      const tokenRegex = /(\w+):([~%@]?)(?:('[^']*'{0,1})|("[^"]*"{0,1})|(\S+))/g;
+      const tokens = [];
+      let lastToken = null;
+      const searchToken = input.replace(tokenRegex, (match, key, symbol, v1, v2, v3) => {
+        let tokenValue = v1 || v2 || v3;
+        let tokenSymbol = symbol;
+
+        if (tokenValue === '~' || tokenValue === '%' || tokenValue === '@') {
+          tokenSymbol = tokenValue;
+          tokenValue = '';
+        }
+
+        tokens.push({
+          key,
+          value: tokenValue || '',
+          symbol: tokenSymbol || '',
+        });
+        return '';
+      }).replace(/\s{2,}/g, ' ').trim() || '';
+
+      if (tokens.length > 0) {
+        const last = tokens[tokens.length - 1];
+        const lastString = `${last.key}:${last.symbol}${last.value}`;
+        lastToken = input.lastIndexOf(lastString) ===
+          input.length - lastString.length ? last : searchToken;
+      } else {
+        lastToken = searchToken;
+      }
+
+      return {
+        tokens,
+        lastToken,
+        searchToken,
+      };
+    }
+  }
+
+  window.gl = window.gl || {};
+  gl.FilteredSearchTokenizer = FilteredSearchTokenizer;
+})();
diff --git a/app/assets/javascripts/lib/utils/common_utils.js.es6 b/app/assets/javascripts/lib/utils/common_utils.js.es6
index b8d637a9827..0c6a3cc3170 100644
--- a/app/assets/javascripts/lib/utils/common_utils.js.es6
+++ b/app/assets/javascripts/lib/utils/common_utils.js.es6
@@ -124,6 +124,12 @@
       return parsedUrl.pathname.charAt(0) === '/' ? parsedUrl.pathname : '/' + parsedUrl.pathname;
     };
 
+    gl.utils.getUrlParamsArray = function () {
+      // We can trust that each param has one & since values containing & will be encoded
+      // Remove the first character of search as it is always ?
+      return window.location.search.slice(1).split('&');
+    };
+
     gl.utils.isMetaKey = function(e) {
       return e.metaKey || e.ctrlKey || e.altKey || e.shiftKey;
     };
diff --git a/app/assets/javascripts/lib/utils/text_utility.js b/app/assets/javascripts/lib/utils/text_utility.js
index 5066e3282d7..c856a26ae40 100644
--- a/app/assets/javascripts/lib/utils/text_utility.js
+++ b/app/assets/javascripts/lib/utils/text_utility.js
@@ -17,6 +17,21 @@
     gl.text.replaceRange = function(s, start, end, substitute) {
       return s.substring(0, start) + substitute + s.substring(end);
     };
+    gl.text.getTextWidth = function(text, font) {
+      /**
+      * Uses canvas.measureText to compute and return the width of the given text of given font in pixels.
+      *
+      * @param {String} text The text to be rendered.
+      * @param {String} font The css font descriptor that text is to be rendered with (e.g. "bold 14px verdana").
+      *
+      * @see http://stackoverflow.com/questions/118241/calculate-text-width-with-javascript/21015393#21015393
+      */
+      // re-use canvas object for better performance
+      var canvas = gl.text.getTextWidth.canvas || (gl.text.getTextWidth.canvas = document.createElement('canvas'));
+      var context = canvas.getContext('2d');
+      context.font = font;
+      return context.measureText(text).width;
+    };
     gl.text.selectedText = function(text, textarea) {
       return text.substring(textarea.selectionStart, textarea.selectionEnd);
     };
diff --git a/app/assets/javascripts/search_autocomplete.js.es6 b/app/assets/javascripts/search_autocomplete.js.es6
index 437f5dbbf7d..cec8856d4e7 100644
--- a/app/assets/javascripts/search_autocomplete.js.es6
+++ b/app/assets/javascripts/search_autocomplete.js.es6
@@ -142,8 +142,9 @@
     }
 
     getCategoryContents() {
-      var dashboardOptions, groupOptions, issuesPath, items, mrPath, name, options, projectOptions, userId, utils;
+      var dashboardOptions, groupOptions, issuesPath, items, mrPath, name, options, projectOptions, userId, userName, utils;
       userId = gon.current_user_id;
+      userName = gon.current_username;
       utils = gl.utils, projectOptions = gl.projectOptions, groupOptions = gl.groupOptions, dashboardOptions = gl.dashboardOptions;
       if (utils.isInGroupsPage() && groupOptions) {
         options = groupOptions[utils.getGroupSlug()];
@@ -158,10 +159,10 @@
           header: "" + name
         }, {
           text: 'Issues assigned to me',
-          url: issuesPath + "/?assignee_id=" + userId
+          url: issuesPath + "/?assignee_username=" + userName
         }, {
           text: "Issues I've created",
-          url: issuesPath + "/?author_id=" + userId
+          url: issuesPath + "/?author_username=" + userName
         }, 'separator', {
           text: 'Merge requests assigned to me',
           url: mrPath + "/?assignee_id=" + userId
diff --git a/app/assets/stylesheets/framework/filters.scss b/app/assets/stylesheets/framework/filters.scss
index 19827943385..fee38b05023 100644
--- a/app/assets/stylesheets/framework/filters.scss
+++ b/app/assets/stylesheets/framework/filters.scss
@@ -23,3 +23,118 @@
   }
 }
 
+.filtered-search-container {
+  display: -webkit-flex;
+  display: flex;
+}
+
+.filtered-search-input-container {
+  display: -webkit-flex;
+  display: flex;
+  position: relative;
+  width: 100%;
+
+  .form-control {
+    padding-left: 25px;
+    padding-right: 25px;
+
+    &:focus ~ .fa-filter {
+      color: $common-gray-dark;
+    }
+  }
+
+  .fa-filter {
+    position: absolute;
+    top: 10px;
+    left: 10px;
+    color: $gray-darkest;
+  }
+
+  .fa-times {
+    right: 10px;
+    color: $gray-darkest;
+  }
+
+  .clear-search {
+    width: 35px;
+    background-color: transparent;
+    border: none;
+    position: absolute;
+    right: 0;
+    height: 100%;
+    outline: none;
+
+    &:hover .fa-times {
+      color: $common-gray-dark;
+    }
+  }
+}
+
+.dropdown-menu .filter-dropdown-item {
+  padding: 0;
+}
+
+.filter-dropdown {
+  max-height: 215px;
+  overflow-x: scroll;
+}
+
+.filter-dropdown-item {
+  .btn {
+    border: none;
+    width: 100%;
+    text-align: left;
+    padding: 8px 16px;
+    text-overflow: ellipsis;
+    overflow-y: hidden;
+    border-radius: 0;
+
+    .fa {
+      width: 15px;
+    }
+
+    .dropdown-label-box {
+      border-color: $white-light;
+      border-style: solid;
+      border-width: 1px;
+      width: 17px;
+      height: 17px;
+    }
+
+    &:hover,
+    &:focus {
+      background-color: $dropdown-hover-color;
+      color: $white-light;
+      text-decoration: none;
+
+      .avatar {
+        border-color: $white-light;
+      }
+    }
+  }
+
+  .dropdown-light-content {
+    font-size: 14px;
+    font-weight: 400;
+  }
+
+  .dropdown-user {
+    display: -webkit-flex;
+    display: flex;
+  }
+
+  .dropdown-user-details {
+    display: -webkit-flex;
+    display: flex;
+    -webkit-flex-direction: column;
+    flex-direction: column;
+  }
+}
+
+.hint-dropdown {
+  width: 250px;
+}
+
+.filter-dropdown-loading {
+  padding: 8px 16px;
+}
diff --git a/app/assets/stylesheets/framework/mobile.scss b/app/assets/stylesheets/framework/mobile.scss
index 92d687996e9..8e2c56a8488 100644
--- a/app/assets/stylesheets/framework/mobile.scss
+++ b/app/assets/stylesheets/framework/mobile.scss
@@ -23,12 +23,16 @@
     margin-right: 0;
   }
 
-  .issues-details-filters,
+  .issues-details-filters:not(.filtered-search-block),
   .dash-projects-filters,
   .check-all-holder {
     display: none;
   }
 
+  .issues-holder .issue-check {
+    display: none;
+  }
+
   .rss-btn {
     display: none;
   }
diff --git a/app/assets/stylesheets/framework/variables.scss b/app/assets/stylesheets/framework/variables.scss
index 3e52c482ece..cf9424ea5dd 100644
--- a/app/assets/stylesheets/framework/variables.scss
+++ b/app/assets/stylesheets/framework/variables.scss
@@ -264,6 +264,11 @@ $dropdown-toggle-active-border-color: darken($border-color, 14%);
 
 
 /*
+* Filtered Search
+*/
+$dropdown-hover-color: #3b86ff;
+
+/*
 * Buttons
 */
 $btn-active-gray: #ececec;
diff --git a/app/finders/issuable_finder.rb b/app/finders/issuable_finder.rb
index b4c14d05eaf..1576fc80a6b 100644
--- a/app/finders/issuable_finder.rb
+++ b/app/finders/issuable_finder.rb
@@ -165,31 +165,53 @@ class IssuableFinder
       end
   end
 
-  def assignee?
-    params[:assignee_id].present?
+  def assignee_id?
+    params[:assignee_id].present? && params[:assignee_id] != NONE
+  end
+
+  def assignee_username?
+    params[:assignee_username].present? && params[:assignee_username] != NONE
+  end
+
+  def no_assignee?
+    # Assignee_id takes precedence over assignee_username
+    params[:assignee_id] == NONE || params[:assignee_username] == NONE
   end
 
   def assignee
     return @assignee if defined?(@assignee)
 
     @assignee =
-      if assignee? && params[:assignee_id] != NONE
-        User.find(params[:assignee_id])
+      if assignee_id?
+        User.find_by(id: params[:assignee_id])
+      elsif assignee_username?
+        User.find_by(username: params[:assignee_username])
       else
         nil
       end
   end
 
-  def author?
-    params[:author_id].present?
+  def author_id?
+    params[:author_id].present? && params[:author_id] != NONE
+  end
+
+  def author_username?
+    params[:author_username].present? && params[:author_username] != NONE
+  end
+
+  def no_author?
+    # author_id takes precedence over author_username
+    params[:author_id] == NONE || params[:author_username] == NONE
   end
 
   def author
     return @author if defined?(@author)
 
     @author =
-      if author? && params[:author_id] != NONE
-        User.find(params[:author_id])
+      if author_id?
+        User.find_by(id: params[:author_id])
+      elsif author_username?
+        User.find_by(username: params[:author_username])
       else
         nil
       end
@@ -263,16 +285,24 @@ class IssuableFinder
   end
 
   def by_assignee(items)
-    if assignee?
-      items = items.where(assignee_id: assignee.try(:id))
+    if assignee
+      items = items.where(assignee_id: assignee.id)
+    elsif no_assignee?
+      items = items.where(assignee_id: nil)
+    elsif assignee_id? || assignee_username? # assignee not found
+      items = items.none
     end
 
     items
   end
 
   def by_author(items)
-    if author?
-      items = items.where(author_id: author.try(:id))
+    if author
+      items = items.where(author_id: author.id)
+    elsif no_author?
+      items = items.where(author_id: nil)
+    elsif author_id? || author_username? # author not found
+      items = items.none
     end
 
     items
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index c816b616631..a112928c6de 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -244,7 +244,9 @@ module ApplicationHelper
       scope: params[:scope],
       milestone_title: params[:milestone_title],
       assignee_id: params[:assignee_id],
+      assignee_username: params[:assignee_username],
       author_id: params[:author_id],
+      author_username: params[:author_username],
       search: params[:search],
       label_name: params[:label_name]
     }
diff --git a/app/views/projects/issues/index.html.haml b/app/views/projects/issues/index.html.haml
index 26f3f0ac292..18e8372ecab 100644
--- a/app/views/projects/issues/index.html.haml
+++ b/app/views/projects/issues/index.html.haml
@@ -6,6 +6,9 @@
 = content_for :sub_nav do
   = render "projects/issues/head"
 
+- content_for :page_specific_javascripts do
+  = page_specific_javascript_tag('filtered_search/filtered_search_bundle.js')
+
 = content_for :meta_tags do
   - if current_user
     = auto_discovery_link_tag(:atom, url_for(params.merge(format: :atom, private_token: current_user.private_token)), title: "#{@project.name} issues")
@@ -20,7 +23,6 @@
             = icon('rss')
             %span.icon-label
               Subscribe
-        = render 'shared/issuable/search_form', path: namespace_project_issues_path(@project.namespace, @project)
         - if can? current_user, :create_issue, @project
           = link_to new_namespace_project_issue_path(@project.namespace,
                                                      @project,
@@ -30,7 +32,7 @@
                                                      title: "New Issue",
                                                      id: "new_issue_link" do
             New Issue
-    = render 'shared/issuable/filter', type: :issues
+    = render 'shared/issuable/search_bar', type: :issues
 
     .issues-holder
       = render 'issues'
diff --git a/app/views/shared/issuable/_search_bar.html.haml b/app/views/shared/issuable/_search_bar.html.haml
new file mode 100644
index 00000000000..8d7b1d616f4
--- /dev/null
+++ b/app/views/shared/issuable/_search_bar.html.haml
@@ -0,0 +1,127 @@
+- type = local_assigns.fetch(:type)
+
+.issues-filters
+  .issues-details-filters.row-content-block.second-block.filtered-search-block
+    = form_tag page_filter_path(without: [:assignee_id, :author_id, :milestone_title, :label_name, :search]), method: :get, class: 'filter-form js-filter-form' do
+      - if params[:search].present?
+        = hidden_field_tag :search, params[:search]
+      - if @bulk_edit
+        .check-all-holder
+          = check_box_tag "check_all_issues", nil, false,
+            class: "check_all_issues left"
+      .issues-other-filters.filtered-search-container
+        .filtered-search-input-container
+          %input.form-control.filtered-search{ placeholder: 'Search or filter results...', 'data-id' => 'filtered-search', 'data-project-id' => @project.id }
+          = icon('filter')
+          %button.clear-search.hidden{ type: 'button' }
+            = icon('times')
+          #js-dropdown-hint.dropdown-menu.hint-dropdown
+            %ul{ 'data-dropdown' => true }
+              %li.filter-dropdown-item{ 'data-value' => '' }
+                %button.btn.btn-link
+                  = icon('search')
+                  %span
+                    Keep typing and press Enter
+            %ul.filter-dropdown{ 'data-dynamic' => true, 'data-dropdown' => true }
+              %li.filter-dropdown-item
+                %button.btn.btn-link
+                  -# Encapsulate static class name `{{icon}}` inside #{} to bypass
+                  -# haml lint's ClassAttributeWithStaticValue
+                  %i.fa{ class: "#{'{{icon}}'}" }
+                  %span.js-filter-hint
+                    {{hint}}
+                  %span.js-filter-tag.dropdown-light-content
+                    {{tag}}
+          #js-dropdown-author.dropdown-menu
+            %ul.filter-dropdown{ 'data-dynamic' => true, 'data-dropdown' => true }
+              %li.filter-dropdown-item
+                %button.btn.btn-link.dropdown-user
+                  %img.avatar.avatar-inline{ 'data-src' => '{{avatar_url}}', alt: '{{name}}\'s avatar', width: '30' }
+                  .dropdown-user-details
+                    %span
+                      {{name}}
+                    %span.dropdown-light-content
+                      @{{username}}
+          #js-dropdown-assignee.dropdown-menu
+            %ul{ 'data-dropdown' => true }
+              %li.filter-dropdown-item{ 'data-value' => 'none' }
+                %button.btn.btn-link
+                  No Assignee
+              %li.divider
+            %ul.filter-dropdown{ 'data-dynamic' => true, 'data-dropdown' => true }
+              %li.filter-dropdown-item
+                %button.btn.btn-link.dropdown-user
+                  %img.avatar.avatar-inline{ 'data-src' => '{{avatar_url}}', alt: '{{name}}\'s avatar', width: '30' }
+                  .dropdown-user-details
+                    %span
+                      {{name}}
+                    %span.dropdown-light-content
+                      @{{username}}
+          #js-dropdown-milestone.dropdown-menu{ 'data-dropdown' => true }
+            %ul{ 'data-dropdown' => true }
+              %li.filter-dropdown-item{ 'data-value' => 'none' }
+                %button.btn.btn-link
+                  No Milestone
+              %li.filter-dropdown-item{ 'data-value' => 'upcoming' }
+                %button.btn.btn-link
+                  Upcoming
+              %li.divider
+            %ul.filter-dropdown{ 'data-dynamic' => true, 'data-dropdown' => true }
+              %li.filter-dropdown-item
+                %button.btn.btn-link.js-data-value
+                  {{title}}
+          #js-dropdown-label.dropdown-menu{ 'data-dropdown' => true }
+            %ul{ 'data-dropdown' => true }
+              %li.filter-dropdown-item{ 'data-value' => 'none' }
+                %button.btn.btn-link
+                  No Label
+              %li.divider
+            %ul.filter-dropdown{ 'data-dynamic' => true, 'data-dropdown' => true }
+              %li.filter-dropdown-item
+                %button.btn.btn-link
+                  %span.dropdown-label-box{ style: 'background: {{color}}' }
+                  %span.label-title.js-data-value
+                    {{title}}
+        .pull-right
+          = render 'shared/sort_dropdown'
+
+    - if @bulk_edit
+      .issues_bulk_update.hide
+        = form_tag [:bulk_update, @project.namespace.becomes(Namespace), @project, type], method: :post, class: 'bulk-update'  do
+          .filter-item.inline
+            = dropdown_tag("Status", options: { toggle_class: "js-issue-status", title: "Change status", dropdown_class: "dropdown-menu-status dropdown-menu-selectable", data: { field_name: "update[state_event]" } } ) do
+              %ul
+                %li
+                  %a{ href: "#", data: { id: "reopen" } } Open
+                %li
+                  %a{ href: "#", data: { id: "close" } } Closed
+          .filter-item.inline
+            = dropdown_tag("Assignee", options: { toggle_class: "js-user-search js-update-assignee js-filter-submit js-filter-bulk-update", title: "Assign to", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable",
+              placeholder: "Search authors", data: { first_user: (current_user.username if current_user), null_user: true, current_user: true, project_id: @project.id, field_name: "update[assignee_id]" } })
+          .filter-item.inline
+            = dropdown_tag("Milestone", options: { title: "Assign milestone", toggle_class: 'js-milestone-select js-extra-options js-filter-submit js-filter-bulk-update', filter: true, dropdown_class: "dropdown-menu-selectable dropdown-menu-milestone", placeholder: "Search milestones", data: { show_no: true, field_name: "update[milestone_id]", project_id: @project.id, milestones: namespace_project_milestones_path(@project.namespace, @project, :json), use_id: true } })
+          .filter-item.inline.labels-filter
+            = render "shared/issuable/label_dropdown", classes: ['js-filter-bulk-update', 'js-multiselect'], show_create: false, show_footer: false, extra_options: false, filter_submit: false, data_options: { persist_when_hide: "true", field_name: "update[label_ids][]", show_no: false, show_any: false, use_id: true }
+          .filter-item.inline
+            = dropdown_tag("Subscription", options: { toggle_class: "js-subscription-event", title: "Change subscription", dropdown_class: "dropdown-menu-selectable", data: { field_name: "update[subscription_event]" } } ) do
+              %ul
+                %li
+                  %a{ href: "#", data: { id: "subscribe" } } Subscribe
+                %li
+                  %a{ href: "#", data: { id: "unsubscribe" } } Unsubscribe
+
+          = hidden_field_tag 'update[issuable_ids]', []
+          = hidden_field_tag :state_event, params[:state_event]
+          .filter-item.inline
+            = button_tag "Update #{type.to_s.humanize(capitalize: false)}", class: "btn update_selected_issues btn-save"
+
+:javascript
+  new UsersSelect();
+  new LabelsSelect();
+  new MilestoneSelect();
+  new IssueStatusSelect();
+  new SubscriptionSelect();
+  $('form.filter-form').on('submit', function (event) {
+    event.preventDefault();
+    Turbolinks.visit(this.action + '&' + $(this).serialize());
+  });