grunt

6 files changed, 38 insertions, 26 deletions

diff --git a/js/dist/collapse.js b/js/dist/collapse.js
index dcf368128b..670f9ad284 100644
--- a/js/dist/collapse.js
+++ b/js/dist/collapse.js
@@ -59,7 +59,8 @@ var Collapse = function ($) {
 
   var Selector = {
     ACTIVES: '.card > .show, .card > .collapsing',
-    DATA_TOGGLE: '[data-toggle="collapse"]'
+    DATA_TOGGLE: '[data-toggle="collapse"]',
+    DATA_CHILDREN: 'data-children'
   };
 
   /**
@@ -76,13 +77,20 @@ var Collapse = function ($) {
       this._element = element;
       this._config = this._getConfig(config);
       this._triggerArray = $.makeArray($('[data-toggle="collapse"][href="#' + element.id + '"],' + ('[data-toggle="collapse"][data-target="#' + element.id + '"]')));
-
       this._parent = this._config.parent ? this._getParent() : null;
 
       if (!this._config.parent) {
         this._addAriaAndCollapsedClass(this._element, this._triggerArray);
       }
 
+      this._selectorActives = Selector.ACTIVES;
+      if (this._parent) {
+        var childrenSelector = this._parent.hasAttribute(Selector.DATA_CHILDREN) ? this._parent.getAttribute(Selector.DATA_CHILDREN) : null;
+        if (childrenSelector !== null) {
+          this._selectorActives = childrenSelector + ' > .show, ' + childrenSelector + ' > .collapsing';
+        }
+      }
+
       if (this._config.toggle) {
         this.toggle();
       }
@@ -115,7 +123,7 @@ var Collapse = function ($) {
       var activesData = void 0;
 
       if (this._parent) {
-        actives = $.makeArray($(this._parent).find(Selector.ACTIVES));
+        actives = $.makeArray($(this._parent).find(this._selectorActives));
         if (!actives.length) {
           actives = null;
         }
@@ -195,9 +203,8 @@ var Collapse = function ($) {
       }
 
       var dimension = this._getDimension();
-      var offsetDimension = dimension === Dimension.WIDTH ? 'offsetWidth' : 'offsetHeight';
 
-      this._element.style[dimension] = this._element[offsetDimension] + 'px';
+      this._element.style[dimension] = this._element.getBoundingClientRect()[dimension] + 'px';
 
       Util.reflow(this._element);
 
diff --git a/js/dist/collapse.js.map b/js/dist/collapse.js.map
index c6d84d52b7..88370841ec 100644
--- a/js/dist/collapse.js.map
+++ b/js/dist/collapse.js.map
@@ -1 +1 @@
-{"version":3,"sources":["../src/collapse.js"],"names":["Collapse","$","NAME","VERSION","DATA_KEY","EVENT_KEY","DATA_API_KEY","JQUERY_NO_CONFLICT","fn","TRANSITION_DURATION","Default","toggle","parent","DefaultType","Event","SHOW","SHOWN","HIDE","HIDDEN","CLICK_DATA_API","ClassName","COLLAPSE","COLLAPSING","COLLAPSED","Dimension","WIDTH","HEIGHT","Selector","ACTIVES","DATA_TOGGLE","element","config","_isTransitioning","_element","_config","_getConfig","_triggerArray","makeArray","id","_parent","_getParent","_addAriaAndCollapsedClass","hasClass","hide","show","Error","actives","activesData","find","length","data","startEvent","trigger","isDefaultPrevented","_jQueryInterface","call","dimension","_getDimension","removeClass","addClass","style","setAttribute","attr","setTransitioning","complete","Util","supportsTransitionEnd","capitalizedDimension","toUpperCase","slice","scrollSize","one","TRANSITION_END","emulateTransitionEnd","offsetDimension","reflow","isTransitioning","dispose","removeData","extend","Boolean","typeCheckConfig","hasWidth","selector","each","i","_getTargetFromElement","triggerArray","isOpen","toggleClass","getSelectorFromElement","$this","test","undefined","document","on","event","preventDefault","target","Constructor","noConflict","jQuery"],"mappings":";;;;;;AAGA;;;;;;;AAOA,IAAMA,WAAY,UAACC,CAAD,EAAO;;AAGvB;;;;;;AAMA,MAAMC,OAAsB,UAA5B;AACA,MAAMC,UAAsB,eAA5B;AACA,MAAMC,WAAsB,aAA5B;AACA,MAAMC,kBAA0BD,QAAhC;AACA,MAAME,eAAsB,WAA5B;AACA,MAAMC,qBAAsBN,EAAEO,EAAF,CAAKN,IAAL,CAA5B;AACA,MAAMO,sBAAsB,GAA5B;;AAEA,MAAMC,UAAU;AACdC,YAAS,IADK;AAEdC,YAAS;AAFK,GAAhB;;AAKA,MAAMC,cAAc;AAClBF,YAAS,SADS;AAElBC,YAAS;AAFS,GAApB;;AAKA,MAAME,QAAQ;AACZC,mBAAwBV,SADZ;AAEZW,qBAAyBX,SAFb;AAGZY,mBAAwBZ,SAHZ;AAIZa,uBAA0Bb,SAJd;AAKZc,8BAAyBd,SAAzB,GAAqCC;AALzB,GAAd;;AAQA,MAAMc,YAAY;AAChBL,UAAa,MADG;AAEhBM,cAAa,UAFG;AAGhBC,gBAAa,YAHG;AAIhBC,eAAa;AAJG,GAAlB;;AAOA,MAAMC,YAAY;AAChBC,WAAS,OADO;AAEhBC,YAAS;AAFO,GAAlB;;AAKA,MAAMC,WAAW;AACfC,aAAc,oCADC;AAEfC,iBAAc;AAFC,GAAjB;;AAMA;;;;;;AArDuB,MA2DjB7B,QA3DiB;AA6DrB,sBAAY8B,OAAZ,EAAqBC,MAArB,EAA6B;AAAA;;AAC3B,WAAKC,gBAAL,GAAwB,KAAxB;AACA,WAAKC,QAAL,GAAwBH,OAAxB;AACA,WAAKI,OAAL,GAAwB,KAAKC,UAAL,CAAgBJ,MAAhB,CAAxB;AACA,WAAKK,aAAL,GAAwBnC,EAAEoC,SAAF,CAAYpC,EAClC,qCAAmC6B,QAAQQ,EAA3C,wDAC0CR,QAAQQ,EADlD,QADkC,CAAZ,CAAxB;;AAKA,WAAKC,OAAL,GAAe,KAAKL,OAAL,CAAatB,MAAb,GAAsB,KAAK4B,UAAL,EAAtB,GAA0C,IAAzD;;AAEA,UAAI,CAAC,KAAKN,OAAL,CAAatB,MAAlB,EAA0B;AACxB,aAAK6B,yBAAL,CAA+B,KAAKR,QAApC,EAA8C,KAAKG,aAAnD;AACD;;AAED,UAAI,KAAKF,OAAL,CAAavB,MAAjB,EAAyB;AACvB,aAAKA,MAAL;AACD;AACF;;AAGD;;AAWA;;AA7FqB,uBA+FrBA,MA/FqB,qBA+FZ;AACP,UAAIV,EAAE,KAAKgC,QAAP,EAAiBS,QAAjB,CAA0BtB,UAAUL,IAApC,CAAJ,EAA+C;AAC7C,aAAK4B,IAAL;AACD,OAFD,MAEO;AACL,aAAKC,IAAL;AACD;AACF,KArGoB;;AAAA,uBAuGrBA,IAvGqB,mBAuGd;AAAA;;AACL,UAAI,KAAKZ,gBAAT,EAA2B;AACzB,cAAM,IAAIa,KAAJ,CAAU,2BAAV,CAAN;AACD;;AAED,UAAI5C,EAAE,KAAKgC,QAAP,EAAiBS,QAAjB,CAA0BtB,UAAUL,IAApC,CAAJ,EAA+C;AAC7C;AACD;;AAED,UAAI+B,gBAAJ;AACA,UAAIC,oBAAJ;;AAEA,UAAI,KAAKR,OAAT,EAAkB;AAChBO,kBAAU7C,EAAEoC,SAAF,CAAYpC,EAAE,KAAKsC,OAAP,EAAgBS,IAAhB,CAAqBrB,SAASC,OAA9B,CAAZ,CAAV;AACA,YAAI,CAACkB,QAAQG,MAAb,EAAqB;AACnBH,oBAAU,IAAV;AACD;AACF;;AAED,UAAIA,OAAJ,EAAa;AACXC,sBAAc9C,EAAE6C,OAAF,EAAWI,IAAX,CAAgB9C,QAAhB,CAAd;AACA,YAAI2C,eAAeA,YAAYf,gBAA/B,EAAiD;AAC/C;AACD;AACF;;AAED,UAAMmB,aAAalD,EAAEa,KAAF,CAAQA,MAAMC,IAAd,CAAnB;AACAd,QAAE,KAAKgC,QAAP,EAAiBmB,OAAjB,CAAyBD,UAAzB;AACA,UAAIA,WAAWE,kBAAX,EAAJ,EAAqC;AACnC;AACD;;AAED,UAAIP,OAAJ,EAAa;AACX9C,iBAASsD,gBAAT,CAA0BC,IAA1B,CAA+BtD,EAAE6C,OAAF,CAA/B,EAA2C,MAA3C;AACA,YAAI,CAACC,WAAL,EAAkB;AAChB9C,YAAE6C,OAAF,EAAWI,IAAX,CAAgB9C,QAAhB,EAA0B,IAA1B;AACD;AACF;;AAED,UAAMoD,YAAY,KAAKC,aAAL,EAAlB;;AAEAxD,QAAE,KAAKgC,QAAP,EACGyB,WADH,CACetC,UAAUC,QADzB,EAEGsC,QAFH,CAEYvC,UAAUE,UAFtB;;AAIA,WAAKW,QAAL,CAAc2B,KAAd,CAAoBJ,SAApB,IAAiC,CAAjC;AACA,WAAKvB,QAAL,CAAc4B,YAAd,CAA2B,eAA3B,EAA4C,IAA5C;;AAEA,UAAI,KAAKzB,aAAL,CAAmBa,MAAvB,EAA+B;AAC7BhD,UAAE,KAAKmC,aAAP,EACGsB,WADH,CACetC,UAAUG,SADzB,EAEGuC,IAFH,CAEQ,eAFR,EAEyB,IAFzB;AAGD;;AAED,WAAKC,gBAAL,CAAsB,IAAtB;;AAEA,UAAMC,WAAW,SAAXA,QAAW,GAAM;AACrB/D,UAAE,MAAKgC,QAAP,EACGyB,WADH,CACetC,UAAUE,UADzB,EAEGqC,QAFH,CAEYvC,UAAUC,QAFtB,EAGGsC,QAHH,CAGYvC,UAAUL,IAHtB;;AAKA,cAAKkB,QAAL,CAAc2B,KAAd,CAAoBJ,SAApB,IAAiC,EAAjC;;AAEA,cAAKO,gBAAL,CAAsB,KAAtB;;AAEA9D,UAAE,MAAKgC,QAAP,EAAiBmB,OAAjB,CAAyBtC,MAAME,KAA/B;AACD,OAXD;;AAaA,UAAI,CAACiD,KAAKC,qBAAL,EAAL,EAAmC;AACjCF;AACA;AACD;;AAED,UAAMG,uBAAuBX,UAAU,CAAV,EAAaY,WAAb,KAA6BZ,UAAUa,KAAV,CAAgB,CAAhB,CAA1D;AACA,UAAMC,wBAAgCH,oBAAtC;;AAEAlE,QAAE,KAAKgC,QAAP,EACGsC,GADH,CACON,KAAKO,cADZ,EAC4BR,QAD5B,EAEGS,oBAFH,CAEwBhE,mBAFxB;;AAIA,WAAKwB,QAAL,CAAc2B,KAAd,CAAoBJ,SAApB,IAAoC,KAAKvB,QAAL,CAAcqC,UAAd,CAApC;AACD,KAzLoB;;AAAA,uBA2LrB3B,IA3LqB,mBA2Ld;AAAA;;AACL,UAAI,KAAKX,gBAAT,EAA2B;AACzB,cAAM,IAAIa,KAAJ,CAAU,2BAAV,CAAN;AACD;;AAED,UAAI,CAAC5C,EAAE,KAAKgC,QAAP,EAAiBS,QAAjB,CAA0BtB,UAAUL,IAApC,CAAL,EAAgD;AAC9C;AACD;;AAED,UAAMoC,aAAalD,EAAEa,KAAF,CAAQA,MAAMG,IAAd,CAAnB;AACAhB,QAAE,KAAKgC,QAAP,EAAiBmB,OAAjB,CAAyBD,UAAzB;AACA,UAAIA,WAAWE,kBAAX,EAAJ,EAAqC;AACnC;AACD;;AAED,U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Util from './util'\n\n\n/**\n * --------------------------------------------------------------------------\n * Bootstrap (v4.0.0-alpha.6): collapse.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)\n * --------------------------------------------------------------------------\n */\n\nconst Collapse = (($) => {\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Constants\n   * ------------------------------------------------------------------------\n   */\n\n  const NAME                = 'collapse'\n  const VERSION             = '4.0.0-alpha.6'\n  const DATA_KEY            = 'bs.collapse'\n  const EVENT_KEY           = `.${DATA_KEY}`\n  const DATA_API_KEY        = '.data-api'\n  const JQUERY_NO_CONFLICT  = $.fn[NAME]\n  const TRANSITION_DURATION = 600\n\n  const Default = {\n    toggle : true,\n    parent : ''\n  }\n\n  const DefaultType = {\n    toggle : 'boolean',\n    parent : 'string'\n  }\n\n  const Event = {\n    SHOW           : `show${EVENT_KEY}`,\n    SHOWN          : `shown${EVENT_KEY}`,\n    HIDE           : `hide${EVENT_KEY}`,\n    HIDDEN         : `hidden${EVENT_KEY}`,\n    CLICK_DATA_API : `click${EVENT_KEY}${DATA_API_KEY}`\n  }\n\n  const ClassName = {\n    SHOW       : 'show',\n    COLLAPSE   : 'collapse',\n    COLLAPSING : 'collapsing',\n    COLLAPSED  : 'collapsed'\n  }\n\n  const Dimension = {\n    WIDTH  : 'width',\n    HEIGHT : 'height'\n  }\n\n  const Selector = {\n    ACTIVES     : '.card > .show, .card > .collapsing',\n    DATA_TOGGLE : '[data-toggle=\"collapse\"]'\n  }\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Class Definition\n   * ------------------------------------------------------------------------\n   */\n\n  class Collapse {\n\n    constructor(element, config) {\n      this._isTransitioning = false\n      this._element         = element\n      this._config          = this._getConfig(config)\n      this._triggerArray    = $.makeArray($(\n        `[data-toggle=\"collapse\"][href=\"#${element.id}\"],` +\n        `[data-toggle=\"collapse\"][data-target=\"#${element.id}\"]`\n      ))\n\n      this._parent = this._config.parent ? this._getParent() : null\n\n      if (!this._config.parent) {\n        this._addAriaAndCollapsedClass(this._element, this._triggerArray)\n      }\n\n      if (this._config.toggle) {\n        this.toggle()\n      }\n    }\n\n\n    // getters\n\n    static get VERSION() {\n      return VERSION\n    }\n\n    static get Default() {\n      return Default\n    }\n\n\n    // public\n\n    toggle() {\n      if ($(this._element).hasClass(ClassName.SHOW)) {\n        this.hide()\n      } else {\n        this.show()\n      }\n    }\n\n    show() {\n      if (this._isTransitioning) {\n        throw new Error('Collapse is transitioning')\n      }\n\n      if ($(this._element).hasClass(ClassName.SHOW)) {\n        return\n      }\n\n      let actives\n      let activesData\n\n      if (this._parent) {\n        actives = $.makeArray($(this._parent).find(Selector.ACTIVES))\n        if (!actives.length) {\n          actives = null\n        }\n      }\n\n      if (actives) {\n        activesData = $(actives).data(DATA_KEY)\n        if (activesData && activesData._isTransitioning) {\n          return\n        }\n      }\n\n      const startEvent = $.Event(Event.SHOW)\n      $(this._element).trigger(startEvent)\n      if (startEvent.isDefaultPrevented()) {\n        return\n      }\n\n      if (actives) {\n        Collapse._jQueryInterface.call($(actives), 'hide')\n        if (!activesData) {\n          $(actives).data(DATA_KEY, null)\n        }\n      }\n\n      const dimension = this._getDimension()\n\n      $(this._element)\n        .removeClass(ClassName.COLLAPSE)\n        .addClass(ClassName.COLLAPSING)\n\n      this._element.style[dimension] = 0\n      this._element.setAttribute('aria-expanded', true)\n\n      if (this._triggerArray.length) {\n        $(this._triggerArray)\n          .removeClass(ClassName.COLLAPSED)\n          .attr('aria-expanded', true)\n      }\n\n      this.setTransitioning(true)\n\n      const complete = () => {\n        $(this._element)\n          .removeClass(ClassName.COLLAPSING)\n          .addClass(ClassName.COLLAPSE)\n          .addClass(ClassName.SHOW)\n\n        this._element.style[dimension] = ''\n\n        this.setTransitioning(false)\n\n        $(this._element).trigger(Event.SHOWN)\n      }\n\n      if (!Util.supportsTransitionEnd()) {\n        complete()\n        return\n      }\n\n      const capitalizedDimension = dimension[0].toUpperCase() + dimension.slice(1)\n      const scrollSize           = `scroll${capitalizedDimension}`\n\n      $(this._element)\n        .one(Util.TRANSITION_END, complete)\n        .emulateTransitionEnd(TRANSITION_DURATION)\n\n      this._element.style[dimension] = `${this._element[scrollSize]}px`\n    }\n\n    hide() {\n      if (this._isTransitioning) {\n        throw new Error('Collapse is transitioning')\n      }\n\n      if (!$(this._element).hasClass(ClassName.SHOW)) {\n        return\n      }\n\n      const startEvent = $.Event(Event.HIDE)\n      $(this._element).trigger(startEvent)\n      if (startEvent.isDefaultPrevented()) {\n        return\n      }\n\n      const dimension       = this._getDimension()\n      const offsetDimension = dimension === Dimension.WIDTH ?\n        'offsetWidth' : 'offsetHeight'\n\n      this._element.style[dimension] = `${this._element[offsetDimension]}px`\n\n      Util.reflow(this._element)\n\n      $(this._element)\n        .addClass(ClassName.COLLAPSING)\n        .removeClass(ClassName.COLLAPSE)\n        .removeClass(ClassName.SHOW)\n\n      this._element.setAttribute('aria-expanded', false)\n\n      if (this._triggerArray.length) {\n        $(this._triggerArray)\n          .addClass(ClassName.COLLAPSED)\n          .attr('aria-expanded', false)\n      }\n\n      this.setTransitioning(true)\n\n      const complete = () => {\n        this.setTransitioning(false)\n        $(this._element)\n          .removeClass(ClassName.COLLAPSING)\n          .addClass(ClassName.COLLAPSE)\n          .trigger(Event.HIDDEN)\n      }\n\n      this._element.style[dimension] = ''\n\n      if (!Util.supportsTransitionEnd()) {\n        complete()\n        return\n      }\n\n      $(this._element)\n        .one(Util.TRANSITION_END, complete)\n        .emulateTransitionEnd(TRANSITION_DURATION)\n    }\n\n    setTransitioning(isTransitioning) {\n      this._isTransitioning = isTransitioning\n    }\n\n    dispose() {\n      $.removeData(this._element, DATA_KEY)\n\n      this._config          = null\n      this._parent          = null\n      this._element         = null\n      this._triggerArray    = null\n      this._isTransitioning = null\n    }\n\n\n    // private\n\n    _getConfig(config) {\n      config = $.extend({}, Default, config)\n      config.toggle = Boolean(config.toggle) // coerce string values\n      Util.typeCheckConfig(NAME, config, DefaultType)\n      return config\n    }\n\n    _getDimension() {\n      const hasWidth = $(this._element).hasClass(Dimension.WIDTH)\n      return hasWidth ? Dimension.WIDTH : Dimension.HEIGHT\n    }\n\n    _getParent() {\n      const parent   = $(this._config.parent)[0]\n      const selector =\n        `[data-toggle=\"collapse\"][data-parent=\"${this._config.parent}\"]`\n\n      $(parent).find(selector).each((i, element) => {\n        this._addAriaAndCollapsedClass(\n          Collapse._getTargetFromElement(element),\n          [element]\n        )\n      })\n\n      return parent\n    }\n\n    _addAriaAndCollapsedClass(element, triggerArray) {\n      if (element) {\n        const isOpen = $(element).hasClass(ClassName.SHOW)\n        element.setAttribute('aria-expanded', isOpen)\n\n        if (triggerArray.length) {\n          $(triggerArray)\n            .toggleClass(ClassName.COLLAPSED, !isOpen)\n            .attr('aria-expanded', isOpen)\n        }\n      }\n    }\n\n\n    // static\n\n    static _getTargetFromElement(element) {\n      const selector = Util.getSelectorFromElement(element)\n      return selector ? $(selector)[0] : null\n    }\n\n    static _jQueryInterface(config) {\n      return this.each(function () {\n        const $this   = $(this)\n        let data      = $this.data(DATA_KEY)\n        const _config = $.extend(\n          {},\n          Default,\n          $this.data(),\n          typeof config === 'object' && config\n        )\n\n        if (!data && _config.toggle && /show|hide/.test(config)) {\n          _config.toggle = false\n        }\n\n        if (!data) {\n          data = new Collapse(this, _config)\n          $this.data(DATA_KEY, data)\n        }\n\n        if (typeof config === 'string') {\n          if (data[config] === undefined) {\n            throw new Error(`No method named \"${config}\"`)\n          }\n          data[config]()\n        }\n      })\n    }\n\n  }\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Data Api implementation\n   * ------------------------------------------------------------------------\n   */\n\n  $(document).on(Event.CLICK_DATA_API, Selector.DATA_TOGGLE, function (event) {\n    event.preventDefault()\n\n    const target = Collapse._getTargetFromElement(this)\n    const data   = $(target).data(DATA_KEY)\n    const config = data ? 'toggle' : $(this).data()\n\n    Collapse._jQueryInterface.call($(target), config)\n  })\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * jQuery\n   * ------------------------------------------------------------------------\n   */\n\n  $.fn[NAME]             = Collapse._jQueryInterface\n  $.fn[NAME].Constructor = Collapse\n  $.fn[NAME].noConflict  = function () {\n    $.fn[NAME] = JQUERY_NO_CONFLICT\n    return Collapse._jQueryInterface\n  }\n\n  return Collapse\n\n})(jQuery)\n\nexport default Collapse\n"]}
\ No newline at end of file
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Util from './util'\n\n\n/**\n * --------------------------------------------------------------------------\n * Bootstrap (v4.0.0-alpha.6): collapse.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)\n * --------------------------------------------------------------------------\n */\n\nconst Collapse = (($) => {\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Constants\n   * ------------------------------------------------------------------------\n   */\n\n  const NAME                = 'collapse'\n  const VERSION             = '4.0.0-alpha.6'\n  const DATA_KEY            = 'bs.collapse'\n  const EVENT_KEY           = `.${DATA_KEY}`\n  const DATA_API_KEY        = '.data-api'\n  const JQUERY_NO_CONFLICT  = $.fn[NAME]\n  const TRANSITION_DURATION = 600\n\n  const Default = {\n    toggle : true,\n    parent : ''\n  }\n\n  const DefaultType = {\n    toggle : 'boolean',\n    parent : 'string'\n  }\n\n  const Event = {\n    SHOW           : `show${EVENT_KEY}`,\n    SHOWN          : `shown${EVENT_KEY}`,\n    HIDE           : `hide${EVENT_KEY}`,\n    HIDDEN         : `hidden${EVENT_KEY}`,\n    CLICK_DATA_API : `click${EVENT_KEY}${DATA_API_KEY}`\n  }\n\n  const ClassName = {\n    SHOW       : 'show',\n    COLLAPSE   : 'collapse',\n    COLLAPSING : 'collapsing',\n    COLLAPSED  : 'collapsed'\n  }\n\n  const Dimension = {\n    WIDTH  : 'width',\n    HEIGHT : 'height'\n  }\n\n  const Selector = {\n    ACTIVES     : '.card > .show, .card > .collapsing',\n    DATA_TOGGLE : '[data-toggle=\"collapse\"]',\n    DATA_CHILDREN : 'data-children'\n  }\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Class Definition\n   * ------------------------------------------------------------------------\n   */\n\n  class Collapse {\n\n    constructor(element, config) {\n      this._isTransitioning = false\n      this._element         = element\n      this._config          = this._getConfig(config)\n      this._triggerArray    = $.makeArray($(\n        `[data-toggle=\"collapse\"][href=\"#${element.id}\"],` +\n        `[data-toggle=\"collapse\"][data-target=\"#${element.id}\"]`\n      ))\n      this._parent = this._config.parent ? this._getParent() : null\n\n      if (!this._config.parent) {\n        this._addAriaAndCollapsedClass(this._element, this._triggerArray)\n      }\n\n      this._selectorActives = Selector.ACTIVES\n      if (this._parent) {\n        const childrenSelector = this._parent.hasAttribute(Selector.DATA_CHILDREN) ? this._parent.getAttribute(Selector.DATA_CHILDREN) : null\n        if (childrenSelector !== null) {\n          this._selectorActives = `${childrenSelector} > .show, ${childrenSelector} > .collapsing`\n        }\n      }\n\n      if (this._config.toggle) {\n        this.toggle()\n      }\n    }\n\n\n    // getters\n\n    static get VERSION() {\n      return VERSION\n    }\n\n    static get Default() {\n      return Default\n    }\n\n\n    // public\n\n    toggle() {\n      if ($(this._element).hasClass(ClassName.SHOW)) {\n        this.hide()\n      } else {\n        this.show()\n      }\n    }\n\n    show() {\n      if (this._isTransitioning) {\n        throw new Error('Collapse is transitioning')\n      }\n\n      if ($(this._element).hasClass(ClassName.SHOW)) {\n        return\n      }\n\n      let actives\n      let activesData\n\n      if (this._parent) {\n        actives = $.makeArray($(this._parent).find(this._selectorActives))\n        if (!actives.length) {\n          actives = null\n        }\n      }\n\n      if (actives) {\n        activesData = $(actives).data(DATA_KEY)\n        if (activesData && activesData._isTransitioning) {\n          return\n        }\n      }\n\n      const startEvent = $.Event(Event.SHOW)\n      $(this._element).trigger(startEvent)\n      if (startEvent.isDefaultPrevented()) {\n        return\n      }\n\n      if (actives) {\n        Collapse._jQueryInterface.call($(actives), 'hide')\n        if (!activesData) {\n          $(actives).data(DATA_KEY, null)\n        }\n      }\n\n      const dimension = this._getDimension()\n\n      $(this._element)\n        .removeClass(ClassName.COLLAPSE)\n        .addClass(ClassName.COLLAPSING)\n\n      this._element.style[dimension] = 0\n      this._element.setAttribute('aria-expanded', true)\n\n      if (this._triggerArray.length) {\n        $(this._triggerArray)\n          .removeClass(ClassName.COLLAPSED)\n          .attr('aria-expanded', true)\n      }\n\n      this.setTransitioning(true)\n\n      const complete = () => {\n        $(this._element)\n          .removeClass(ClassName.COLLAPSING)\n          .addClass(ClassName.COLLAPSE)\n          .addClass(ClassName.SHOW)\n\n        this._element.style[dimension] = ''\n\n        this.setTransitioning(false)\n\n        $(this._element).trigger(Event.SHOWN)\n      }\n\n      if (!Util.supportsTransitionEnd()) {\n        complete()\n        return\n      }\n\n      const capitalizedDimension = dimension[0].toUpperCase() + dimension.slice(1)\n      const scrollSize           = `scroll${capitalizedDimension}`\n\n      $(this._element)\n        .one(Util.TRANSITION_END, complete)\n        .emulateTransitionEnd(TRANSITION_DURATION)\n\n      this._element.style[dimension] = `${this._element[scrollSize]}px`\n    }\n\n    hide() {\n      if (this._isTransitioning) {\n        throw new Error('Collapse is transitioning')\n      }\n\n      if (!$(this._element).hasClass(ClassName.SHOW)) {\n        return\n      }\n\n      const startEvent = $.Event(Event.HIDE)\n      $(this._element).trigger(startEvent)\n      if (startEvent.isDefaultPrevented()) {\n        return\n      }\n\n      const dimension       = this._getDimension()\n\n      this._element.style[dimension] = `${this._element.getBoundingClientRect()[dimension]}px`\n\n      Util.reflow(this._element)\n\n      $(this._element)\n        .addClass(ClassName.COLLAPSING)\n        .removeClass(ClassName.COLLAPSE)\n        .removeClass(ClassName.SHOW)\n\n      this._element.setAttribute('aria-expanded', false)\n\n      if (this._triggerArray.length) {\n        $(this._triggerArray)\n          .addClass(ClassName.COLLAPSED)\n          .attr('aria-expanded', false)\n      }\n\n      this.setTransitioning(true)\n\n      const complete = () => {\n        this.setTransitioning(false)\n        $(this._element)\n          .removeClass(ClassName.COLLAPSING)\n          .addClass(ClassName.COLLAPSE)\n          .trigger(Event.HIDDEN)\n      }\n\n      this._element.style[dimension] = ''\n\n      if (!Util.supportsTransitionEnd()) {\n        complete()\n        return\n      }\n\n      $(this._element)\n        .one(Util.TRANSITION_END, complete)\n        .emulateTransitionEnd(TRANSITION_DURATION)\n    }\n\n    setTransitioning(isTransitioning) {\n      this._isTransitioning = isTransitioning\n    }\n\n    dispose() {\n      $.removeData(this._element, DATA_KEY)\n\n      this._config          = null\n      this._parent          = null\n      this._element         = null\n      this._triggerArray    = null\n      this._isTransitioning = null\n    }\n\n\n    // private\n\n    _getConfig(config) {\n      config = $.extend({}, Default, config)\n      config.toggle = Boolean(config.toggle) // coerce string values\n      Util.typeCheckConfig(NAME, config, DefaultType)\n      return config\n    }\n\n    _getDimension() {\n      const hasWidth = $(this._element).hasClass(Dimension.WIDTH)\n      return hasWidth ? Dimension.WIDTH : Dimension.HEIGHT\n    }\n\n    _getParent() {\n      const parent   = $(this._config.parent)[0]\n      const selector =\n        `[data-toggle=\"collapse\"][data-parent=\"${this._config.parent}\"]`\n\n      $(parent).find(selector).each((i, element) => {\n        this._addAriaAndCollapsedClass(\n          Collapse._getTargetFromElement(element),\n          [element]\n        )\n      })\n\n      return parent\n    }\n\n    _addAriaAndCollapsedClass(element, triggerArray) {\n      if (element) {\n        const isOpen = $(element).hasClass(ClassName.SHOW)\n        element.setAttribute('aria-expanded', isOpen)\n\n        if (triggerArray.length) {\n          $(triggerArray)\n            .toggleClass(ClassName.COLLAPSED, !isOpen)\n            .attr('aria-expanded', isOpen)\n        }\n      }\n    }\n\n\n    // static\n\n    static _getTargetFromElement(element) {\n      const selector = Util.getSelectorFromElement(element)\n      return selector ? $(selector)[0] : null\n    }\n\n    static _jQueryInterface(config) {\n      return this.each(function () {\n        const $this   = $(this)\n        let data      = $this.data(DATA_KEY)\n        const _config = $.extend(\n          {},\n          Default,\n          $this.data(),\n          typeof config === 'object' && config\n        )\n\n        if (!data && _config.toggle && /show|hide/.test(config)) {\n          _config.toggle = false\n        }\n\n        if (!data) {\n          data = new Collapse(this, _config)\n          $this.data(DATA_KEY, data)\n        }\n\n        if (typeof config === 'string') {\n          if (data[config] === undefined) {\n            throw new Error(`No method named \"${config}\"`)\n          }\n          data[config]()\n        }\n      })\n    }\n\n  }\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Data Api implementation\n   * ------------------------------------------------------------------------\n   */\n\n  $(document).on(Event.CLICK_DATA_API, Selector.DATA_TOGGLE, function (event) {\n    event.preventDefault()\n\n    const target = Collapse._getTargetFromElement(this)\n    const data   = $(target).data(DATA_KEY)\n    const config = data ? 'toggle' : $(this).data()\n\n    Collapse._jQueryInterface.call($(target), config)\n  })\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * jQuery\n   * ------------------------------------------------------------------------\n   */\n\n  $.fn[NAME]             = Collapse._jQueryInterface\n  $.fn[NAME].Constructor = Collapse\n  $.fn[NAME].noConflict  = function () {\n    $.fn[NAME] = JQUERY_NO_CONFLICT\n    return Collapse._jQueryInterface\n  }\n\n  return Collapse\n\n})(jQuery)\n\nexport default Collapse\n"]}
\ No newline at end of file
diff --git a/js/dist/dropdown.js b/js/dist/dropdown.js
index 6a1b227b11..0c81fe2162 100644
--- a/js/dist/dropdown.js
+++ b/js/dist/dropdown.js
@@ -90,15 +90,6 @@ var Dropdown = function ($) {
         return false;
       }
 
-      if ('ontouchstart' in document.documentElement && !$(parent).closest(Selector.NAVBAR_NAV).length) {
-
-        // if mobile we use a backdrop because click events don't delegate
-        var dropdown = document.createElement('div');
-        dropdown.className = ClassName.BACKDROP;
-        $(dropdown).insertBefore(this);
-        $(dropdown).on('click', Dropdown._clearMenus);
-      }
-
       var relatedTarget = {
         relatedTarget: this
       };
@@ -110,6 +101,16 @@ var Dropdown = function ($) {
         return false;
       }
 
+      // set the backdrop only if the dropdown menu will be opened
+      if ('ontouchstart' in document.documentElement && !$(parent).closest(Selector.NAVBAR_NAV).length) {
+
+        // if mobile we use a backdrop because click events don't delegate
+        var dropdown = document.createElement('div');
+        dropdown.className = ClassName.BACKDROP;
+        $(dropdown).insertBefore(this);
+        $(dropdown).on('click', Dropdown._clearMenus);
+      }
+
       this.focus();
       this.setAttribute('aria-expanded', true);
 
@@ -156,11 +157,6 @@ var Dropdown = function ($) {
         return;
       }
 
-      var backdrop = $(Selector.BACKDROP)[0];
-      if (backdrop) {
-        backdrop.parentNode.removeChild(backdrop);
-      }
-
       var toggles = $.makeArray($(Selector.DATA_TOGGLE));
 
       for (var i = 0; i < toggles.length; i++) {
@@ -183,6 +179,12 @@ var Dropdown = function ($) {
           continue;
         }
 
+        // remove backdrop only if the dropdown menu will be hidden
+        var backdrop = $(parent).find(Selector.BACKDROP)[0];
+        if (backdrop) {
+          backdrop.parentNode.removeChild(backdrop);
+        }
+
         toggles[i].setAttribute('aria-expanded', 'false');
 
         $(parent).removeClass(ClassName.SHOW).trigger($.Event(Event.HIDDEN, relatedTarget));
diff --git a/js/dist/dropdown.js.map b/js/dist/dropdown.js.map
index c27c117b43..0f8e851297 100644
--- a/js/dist/dropdown.js.map
+++ b/js/dist/dropdown.js.map
@@ -1 +1 @@
-{"version":3,"sources":["../src/dropdown.js"],"names":["Dropdown","$","NAME","VERSION","DATA_KEY","EVENT_KEY","DATA_API_KEY","JQUERY_NO_CONFLICT","fn","ESCAPE_KEYCODE","SPACE_KEYCODE","ARROW_UP_KEYCODE","ARROW_DOWN_KEYCODE","RIGHT_MOUSE_BUTTON_WHICH","REGEXP_KEYDOWN","RegExp","Event","HIDE","HIDDEN","SHOW","SHOWN","CLICK","CLICK_DATA_API","FOCUSIN_DATA_API","KEYDOWN_DATA_API","ClassName","BACKDROP","DISABLED","Selector","DATA_TOGGLE","FORM_CHILD","ROLE_MENU","ROLE_LISTBOX","NAVBAR_NAV","VISIBLE_ITEMS","element","_element","_addEventListeners","toggle","disabled","hasClass","parent","_getParentFromElement","isActive","_clearMenus","document","documentElement","closest","length","dropdown","createElement","className","insertBefore","on","relatedTarget","showEvent","trigger","isDefaultPrevented","focus","setAttribute","toggleClass","dispose","removeData","off","_jQueryInterface","config","each","data","undefined","Error","call","event","which","backdrop","parentNode","removeChild","toggles","makeArray","i","type","test","target","tagName","contains","hideEvent","removeClass","selector","Util","getSelectorFromElement","_dataApiKeydownHandler","preventDefault","stopPropagation","find","items","get","index","indexOf","prototype","e","Constructor","noConflict","jQuery"],"mappings":";;;;AAGA;;;;;;;AAOA,IAAMA,WAAY,UAACC,CAAD,EAAO;;AAGvB;;;;;;AAMA,MAAMC,OAA2B,UAAjC;AACA,MAAMC,UAA2B,eAAjC;AACA,MAAMC,WAA2B,aAAjC;AACA,MAAMC,kBAA+BD,QAArC;AACA,MAAME,eAA2B,WAAjC;AACA,MAAMC,qBAA2BN,EAAEO,EAAF,CAAKN,IAAL,CAAjC;AACA,MAAMO,iBAA2B,EAAjC,CAfuB,CAea;AACpC,MAAMC,gBAA2B,EAAjC,CAhBuB,CAgBa;AACpC,MAAMC,mBAA2B,EAAjC,CAjBuB,CAiBa;AACpC,MAAMC,qBAA2B,EAAjC,CAlBuB,CAkBa;AACpC,MAAMC,2BAA2B,CAAjC,CAnBuB,CAmBY;AACnC,MAAMC,iBAAiB,IAAIC,MAAJ,CAAcJ,gBAAd,SAAkCC,kBAAlC,SAAwDH,cAAxD,SAA0EC,aAA1E,CAAvB;;AAEA,MAAMM,QAAQ;AACZC,mBAA0BZ,SADd;AAEZa,uBAA4Bb,SAFhB;AAGZc,mBAA0Bd,SAHd;AAIZe,qBAA2Bf,SAJf;AAKZgB,qBAA2BhB,SALf;AAMZiB,8BAA2BjB,SAA3B,GAAuCC,YAN3B;AAOZiB,kCAA6BlB,SAA7B,GAAyCC,YAP7B;AAQZkB,kCAA6BnB,SAA7B,GAAyCC;AAR7B,GAAd;;AAWA,MAAMmB,YAAY;AAChBC,cAAW,mBADK;AAEhBC,cAAW,UAFK;AAGhBR,UAAW;AAHK,GAAlB;;AAMA,MAAMS,WAAW;AACfF,cAAgB,oBADD;AAEfG,iBAAgB,0BAFD;AAGfC,gBAAgB,gBAHD;AAIfC,eAAgB,eAJD;AAKfC,kBAAgB,kBALD;AAMfC,gBAAgB,aAND;AAOfC,mBAAgB,wCACA;AARD,GAAjB;;AAYA;;;;;;AAnDuB,MAyDjBlC,QAzDiB;AA2DrB,sBAAYmC,OAAZ,EAAqB;AAAA;;AACnB,WAAKC,QAAL,GAAgBD,OAAhB;;AAEA,WAAKE,kBAAL;AACD;;AAGD;;AAOA;;AAzEqB,uBA2ErBC,MA3EqB,qBA2EZ;AACP,UAAI,KAAKC,QAAL,IAAiBtC,EAAE,IAAF,EAAQuC,QAAR,CAAiBf,UAAUE,QAA3B,CAArB,EAA2D;AACzD,eAAO,KAAP;AACD;;AAED,UAAMc,SAAWzC,SAAS0C,qBAAT,CAA+B,IAA/B,CAAjB;AACA,UAAMC,WAAW1C,EAAEwC,MAAF,EAAUD,QAAV,CAAmBf,UAAUN,IAA7B,CAAjB;;AAEAnB,eAAS4C,WAAT;;AAEA,UAAID,QAAJ,EAAc;AACZ,eAAO,KAAP;AACD;;AAED,UAAI,kBAAkBE,SAASC,eAA3B,IACD,CAAC7C,EAAEwC,MAAF,EAAUM,OAAV,CAAkBnB,SAASK,UAA3B,EAAuCe,MAD3C,EACmD;;AAEjD;AACA,YAAMC,WAAeJ,SAASK,aAAT,CAAuB,KAAvB,CAArB;AACAD,iBAASE,SAAT,GAAqB1B,UAAUC,QAA/B;AACAzB,UAAEgD,QAAF,EAAYG,YAAZ,CAAyB,IAAzB;AACAnD,UAAEgD,QAAF,EAAYI,EAAZ,CAAe,OAAf,EAAwBrD,SAAS4C,WAAjC;AACD;;AAED,UAAMU,gBAAgB;AACpBA,uBAAgB;AADI,OAAtB;AAGA,UAAMC,YAAgBtD,EAAEe,KAAF,CAAQA,MAAMG,IAAd,EAAoBmC,aAApB,CAAtB;;AAEArD,QAAEwC,MAAF,EAAUe,OAAV,CAAkBD,SAAlB;;AAEA,UAAIA,UAAUE,kBAAV,EAAJ,EAAoC;AAClC,eAAO,KAAP;AACD;;AAED,WAAKC,KAAL;AACA,WAAKC,YAAL,CAAkB,eAAlB,EAAmC,IAAnC;;AAEA1D,QAAEwC,MAAF,EAAUmB,WAAV,CAAsBnC,UAAUN,IAAhC;AACAlB,QAAEwC,MAAF,EAAUe,OAAV,CAAkBvD,EAAEe,KAAF,CAAQA,MAAMI,KAAd,EAAqBkC,aAArB,CAAlB;;AAEA,aAAO,KAAP;AACD,KArHoB;;AAAA,uBAuHrBO,OAvHqB,sBAuHX;AACR5D,QAAE6D,UAAF,CAAa,KAAK1B,QAAlB,EAA4BhC,QAA5B;AACAH,QAAE,KAAKmC,QAAP,EAAiB2B,GAAjB,CAAqB1D,SAArB;AACA,WAAK+B,QAAL,GAAgB,IAAhB;AACD,KA3HoB;;AA8HrB;;AA9HqB,uBAgIrBC,kBAhIqB,iCAgIA;AACnBpC,QAAE,KAAKmC,QAAP,EAAiBiB,EAAjB,CAAoBrC,MAAMK,KAA1B,EAAiC,KAAKiB,MAAtC;AACD,KAlIoB;;AAqIrB;;AArIqB,aAuId0B,gBAvIc,6BAuIGC,MAvIH,EAuIW;AAC9B,aAAO,KAAKC,IAAL,CAAU,YAAY;AAC3B,YAAIC,OAAOlE,EAAE,IAAF,EAAQkE,IAAR,CAAa/D,QAAb,CAAX;;AAEA,YAAI,CAAC+D,IAAL,EAAW;AACTA,iBAAO,IAAInE,QAAJ,CAAa,IAAb,CAAP;AACAC,YAAE,IAAF,EAAQkE,IAAR,CAAa/D,QAAb,EAAuB+D,IAAvB;AACD;;AAED,YAAI,OAAOF,MAAP,KAAkB,QAAtB,EAAgC;AAC9B,cAAIE,KAAKF,MAAL,MAAiBG,SAArB,EAAgC;AAC9B,kBAAM,IAAIC,KAAJ,uBAA8BJ,MAA9B,OAAN;AACD;AACDE,eAAKF,MAAL,EAAaK,IAAb,CAAkB,IAAlB;AACD;AACF,OAdM,CAAP;AAeD,KAvJoB;;AAAA,aAyJd1B,WAzJc,wBAyJF2B,KAzJE,EAyJK;AACxB,UAAIA,SAASA,MAAMC,KAAN,KAAgB3D,wBAA7B,EAAuD;AACrD;AACD;;AAED,UAAM4D,WAAWxE,EAAE2B,SAASF,QAAX,EAAqB,CAArB,CAAjB;AACA,UAAI+C,QAAJ,EAAc;AACZA,iBAASC,UAAT,CAAoBC,WAApB,CAAgCF,QAAhC;AACD;;AAED,UAAMG,UAAU3E,EAAE4E,SAAF,CAAY5E,EAAE2B,SAASC,WAAX,CAAZ,CAAhB;;AAEA,WAAK,IAAIiD,IAAI,CAAb,EAAgBA,IAAIF,QAAQ5B,MAA5B,EAAoC8B,GAApC,EAAyC;AACvC,YAAMrC,SAAgBzC,SAAS0C,qBAAT,CAA+BkC,QAAQE,CAAR,CAA/B,CAAtB;AACA,YAAMxB,gBAAgB;AACpBA,yBAAgBsB,QAAQE,CAAR;AADI,SAAtB;;AAIA,YAAI,CAAC7E,EAAEwC,MAAF,EAAUD,QAAV,CAAmBf,UAAUN,IAA7B,CAAL,EAAyC;AACvC;AACD;;AAED,YAAIoD,UAAUA,MAAMQ,IAAN,KAAe,OAAf,IACV,kBAAkBC,IAAlB,CAAuBT,MAAMU,MAAN,CAAaC,OAApC,CADU,IACsCX,MAAMQ,IAAN,KAAe,SAD/D,KAEG9E,EAAEkF,QAAF,CAAW1C,MAAX,EAAmB8B,MAAMU,MAAzB,CAFP,EAEyC;AACvC;AACD;;AAED,YAAMG,YAAYnF,EAAEe,K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Util from './util'\n\n\n/**\n * --------------------------------------------------------------------------\n * Bootstrap (v4.0.0-alpha.6): dropdown.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)\n * --------------------------------------------------------------------------\n */\n\nconst Dropdown = (($) => {\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Constants\n   * ------------------------------------------------------------------------\n   */\n\n  const NAME                     = 'dropdown'\n  const VERSION                  = '4.0.0-alpha.6'\n  const DATA_KEY                 = 'bs.dropdown'\n  const EVENT_KEY                = `.${DATA_KEY}`\n  const DATA_API_KEY             = '.data-api'\n  const JQUERY_NO_CONFLICT       = $.fn[NAME]\n  const ESCAPE_KEYCODE           = 27 // KeyboardEvent.which value for Escape (Esc) key\n  const SPACE_KEYCODE            = 32 // KeyboardEvent.which value for space key\n  const ARROW_UP_KEYCODE         = 38 // KeyboardEvent.which value for up arrow key\n  const ARROW_DOWN_KEYCODE       = 40 // KeyboardEvent.which value for down arrow key\n  const RIGHT_MOUSE_BUTTON_WHICH = 3 // MouseEvent.which value for the right button (assuming a right-handed mouse)\n  const REGEXP_KEYDOWN = new RegExp(`${ARROW_UP_KEYCODE}|${ARROW_DOWN_KEYCODE}|${ESCAPE_KEYCODE}|${SPACE_KEYCODE}`)\n\n  const Event = {\n    HIDE             : `hide${EVENT_KEY}`,\n    HIDDEN           : `hidden${EVENT_KEY}`,\n    SHOW             : `show${EVENT_KEY}`,\n    SHOWN            : `shown${EVENT_KEY}`,\n    CLICK            : `click${EVENT_KEY}`,\n    CLICK_DATA_API   : `click${EVENT_KEY}${DATA_API_KEY}`,\n    FOCUSIN_DATA_API : `focusin${EVENT_KEY}${DATA_API_KEY}`,\n    KEYDOWN_DATA_API : `keydown${EVENT_KEY}${DATA_API_KEY}`\n  }\n\n  const ClassName = {\n    BACKDROP : 'dropdown-backdrop',\n    DISABLED : 'disabled',\n    SHOW     : 'show'\n  }\n\n  const Selector = {\n    BACKDROP      : '.dropdown-backdrop',\n    DATA_TOGGLE   : '[data-toggle=\"dropdown\"]',\n    FORM_CHILD    : '.dropdown form',\n    ROLE_MENU     : '[role=\"menu\"]',\n    ROLE_LISTBOX  : '[role=\"listbox\"]',\n    NAVBAR_NAV    : '.navbar-nav',\n    VISIBLE_ITEMS : '[role=\"menu\"] li:not(.disabled) a, '\n                  + '[role=\"listbox\"] li:not(.disabled) a'\n  }\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Class Definition\n   * ------------------------------------------------------------------------\n   */\n\n  class Dropdown {\n\n    constructor(element) {\n      this._element = element\n\n      this._addEventListeners()\n    }\n\n\n    // getters\n\n    static get VERSION() {\n      return VERSION\n    }\n\n\n    // public\n\n    toggle() {\n      if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {\n        return false\n      }\n\n      const parent   = Dropdown._getParentFromElement(this)\n      const isActive = $(parent).hasClass(ClassName.SHOW)\n\n      Dropdown._clearMenus()\n\n      if (isActive) {\n        return false\n      }\n\n      if ('ontouchstart' in document.documentElement &&\n         !$(parent).closest(Selector.NAVBAR_NAV).length) {\n\n        // if mobile we use a backdrop because click events don't delegate\n        const dropdown     = document.createElement('div')\n        dropdown.className = ClassName.BACKDROP\n        $(dropdown).insertBefore(this)\n        $(dropdown).on('click', Dropdown._clearMenus)\n      }\n\n      const relatedTarget = {\n        relatedTarget : this\n      }\n      const showEvent     = $.Event(Event.SHOW, relatedTarget)\n\n      $(parent).trigger(showEvent)\n\n      if (showEvent.isDefaultPrevented()) {\n        return false\n      }\n\n      this.focus()\n      this.setAttribute('aria-expanded', true)\n\n      $(parent).toggleClass(ClassName.SHOW)\n      $(parent).trigger($.Event(Event.SHOWN, relatedTarget))\n\n      return false\n    }\n\n    dispose() {\n      $.removeData(this._element, DATA_KEY)\n      $(this._element).off(EVENT_KEY)\n      this._element = null\n    }\n\n\n    // private\n\n    _addEventListeners() {\n      $(this._element).on(Event.CLICK, this.toggle)\n    }\n\n\n    // static\n\n    static _jQueryInterface(config) {\n      return this.each(function () {\n        let data = $(this).data(DATA_KEY)\n\n        if (!data) {\n          data = new Dropdown(this)\n          $(this).data(DATA_KEY, data)\n        }\n\n        if (typeof config === 'string') {\n          if (data[config] === undefined) {\n            throw new Error(`No method named \"${config}\"`)\n          }\n          data[config].call(this)\n        }\n      })\n    }\n\n    static _clearMenus(event) {\n      if (event && event.which === RIGHT_MOUSE_BUTTON_WHICH) {\n        return\n      }\n\n      const backdrop = $(Selector.BACKDROP)[0]\n      if (backdrop) {\n        backdrop.parentNode.removeChild(backdrop)\n      }\n\n      const toggles = $.makeArray($(Selector.DATA_TOGGLE))\n\n      for (let i = 0; i < toggles.length; i++) {\n        const parent        = Dropdown._getParentFromElement(toggles[i])\n        const relatedTarget = {\n          relatedTarget : toggles[i]\n        }\n\n        if (!$(parent).hasClass(ClassName.SHOW)) {\n          continue\n        }\n\n        if (event && (event.type === 'click' &&\n            /input|textarea/i.test(event.target.tagName) || event.type === 'focusin')\n            && $.contains(parent, event.target)) {\n          continue\n        }\n\n        const hideEvent = $.Event(Event.HIDE, relatedTarget)\n        $(parent).trigger(hideEvent)\n        if (hideEvent.isDefaultPrevented()) {\n          continue\n        }\n\n        toggles[i].setAttribute('aria-expanded', 'false')\n\n        $(parent)\n          .removeClass(ClassName.SHOW)\n          .trigger($.Event(Event.HIDDEN, relatedTarget))\n      }\n    }\n\n    static _getParentFromElement(element) {\n      let parent\n      const selector = Util.getSelectorFromElement(element)\n\n      if (selector) {\n        parent = $(selector)[0]\n      }\n\n      return parent || element.parentNode\n    }\n\n    static _dataApiKeydownHandler(event) {\n      if (!REGEXP_KEYDOWN.test(event.which) ||\n         /input|textarea/i.test(event.target.tagName)) {\n        return\n      }\n\n      event.preventDefault()\n      event.stopPropagation()\n\n      if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {\n        return\n      }\n\n      const parent   = Dropdown._getParentFromElement(this)\n      const isActive = $(parent).hasClass(ClassName.SHOW)\n\n      if (!isActive && event.which !== ESCAPE_KEYCODE ||\n           isActive && event.which === ESCAPE_KEYCODE) {\n\n        if (event.which === ESCAPE_KEYCODE) {\n          const toggle = $(parent).find(Selector.DATA_TOGGLE)[0]\n          $(toggle).trigger('focus')\n        }\n\n        $(this).trigger('click')\n        return\n      }\n\n      const items = $(parent).find(Selector.VISIBLE_ITEMS).get()\n\n      if (!items.length) {\n        return\n      }\n\n      let index = items.indexOf(event.target)\n\n      if (event.which === ARROW_UP_KEYCODE && index > 0) { // up\n        index--\n      }\n\n      if (event.which === ARROW_DOWN_KEYCODE && index < items.length - 1) { // down\n        index++\n      }\n\n      if (index < 0) {\n        index = 0\n      }\n\n      items[index].focus()\n    }\n\n  }\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Data Api implementation\n   * ------------------------------------------------------------------------\n   */\n\n  $(document)\n    .on(Event.KEYDOWN_DATA_API, Selector.DATA_TOGGLE,  Dropdown._dataApiKeydownHandler)\n    .on(Event.KEYDOWN_DATA_API, Selector.ROLE_MENU,    Dropdown._dataApiKeydownHandler)\n    .on(Event.KEYDOWN_DATA_API, Selector.ROLE_LISTBOX, Dropdown._dataApiKeydownHandler)\n    .on(`${Event.CLICK_DATA_API} 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\ No newline at end of file
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Util from './util'\n\n\n/**\n * --------------------------------------------------------------------------\n * Bootstrap (v4.0.0-alpha.6): dropdown.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)\n * --------------------------------------------------------------------------\n */\n\nconst Dropdown = (($) => {\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Constants\n   * ------------------------------------------------------------------------\n   */\n\n  const NAME                     = 'dropdown'\n  const VERSION                  = '4.0.0-alpha.6'\n  const DATA_KEY                 = 'bs.dropdown'\n  const EVENT_KEY                = `.${DATA_KEY}`\n  const DATA_API_KEY             = '.data-api'\n  const JQUERY_NO_CONFLICT       = $.fn[NAME]\n  const ESCAPE_KEYCODE           = 27 // KeyboardEvent.which value for Escape (Esc) key\n  const SPACE_KEYCODE            = 32 // KeyboardEvent.which value for space key\n  const ARROW_UP_KEYCODE         = 38 // KeyboardEvent.which value for up arrow key\n  const ARROW_DOWN_KEYCODE       = 40 // KeyboardEvent.which value for down arrow key\n  const RIGHT_MOUSE_BUTTON_WHICH = 3 // MouseEvent.which value for the right button (assuming a right-handed mouse)\n  const REGEXP_KEYDOWN = new RegExp(`${ARROW_UP_KEYCODE}|${ARROW_DOWN_KEYCODE}|${ESCAPE_KEYCODE}|${SPACE_KEYCODE}`)\n\n  const Event = {\n    HIDE             : `hide${EVENT_KEY}`,\n    HIDDEN           : `hidden${EVENT_KEY}`,\n    SHOW             : `show${EVENT_KEY}`,\n    SHOWN            : `shown${EVENT_KEY}`,\n    CLICK            : `click${EVENT_KEY}`,\n    CLICK_DATA_API   : `click${EVENT_KEY}${DATA_API_KEY}`,\n    FOCUSIN_DATA_API : `focusin${EVENT_KEY}${DATA_API_KEY}`,\n    KEYDOWN_DATA_API : `keydown${EVENT_KEY}${DATA_API_KEY}`\n  }\n\n  const ClassName = {\n    BACKDROP : 'dropdown-backdrop',\n    DISABLED : 'disabled',\n    SHOW     : 'show'\n  }\n\n  const Selector = {\n    BACKDROP      : '.dropdown-backdrop',\n    DATA_TOGGLE   : '[data-toggle=\"dropdown\"]',\n    FORM_CHILD    : '.dropdown form',\n    ROLE_MENU     : '[role=\"menu\"]',\n    ROLE_LISTBOX  : '[role=\"listbox\"]',\n    NAVBAR_NAV    : '.navbar-nav',\n    VISIBLE_ITEMS : '[role=\"menu\"] li:not(.disabled) a, '\n                  + '[role=\"listbox\"] li:not(.disabled) a'\n  }\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Class Definition\n   * ------------------------------------------------------------------------\n   */\n\n  class Dropdown {\n\n    constructor(element) {\n      this._element = element\n\n      this._addEventListeners()\n    }\n\n\n    // getters\n\n    static get VERSION() {\n      return VERSION\n    }\n\n\n    // public\n\n    toggle() {\n      if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {\n        return false\n      }\n\n      const parent   = Dropdown._getParentFromElement(this)\n      const isActive = $(parent).hasClass(ClassName.SHOW)\n\n      Dropdown._clearMenus()\n\n      if (isActive) {\n        return false\n      }\n\n      const relatedTarget = {\n        relatedTarget : this\n      }\n      const showEvent     = $.Event(Event.SHOW, relatedTarget)\n\n      $(parent).trigger(showEvent)\n\n      if (showEvent.isDefaultPrevented()) {\n        return false\n      }\n\n      // set the backdrop only if the dropdown menu will be opened\n      if ('ontouchstart' in document.documentElement &&\n         !$(parent).closest(Selector.NAVBAR_NAV).length) {\n\n        // if mobile we use a backdrop because click events don't delegate\n        const dropdown     = document.createElement('div')\n        dropdown.className = ClassName.BACKDROP\n        $(dropdown).insertBefore(this)\n        $(dropdown).on('click', Dropdown._clearMenus)\n      }\n\n      this.focus()\n      this.setAttribute('aria-expanded', true)\n\n      $(parent).toggleClass(ClassName.SHOW)\n      $(parent).trigger($.Event(Event.SHOWN, relatedTarget))\n\n      return false\n    }\n\n    dispose() {\n      $.removeData(this._element, DATA_KEY)\n      $(this._element).off(EVENT_KEY)\n      this._element = null\n    }\n\n\n    // private\n\n    _addEventListeners() {\n      $(this._element).on(Event.CLICK, this.toggle)\n    }\n\n\n    // static\n\n    static _jQueryInterface(config) {\n      return this.each(function () {\n        let data = $(this).data(DATA_KEY)\n\n        if (!data) {\n          data = new Dropdown(this)\n          $(this).data(DATA_KEY, data)\n        }\n\n        if (typeof config === 'string') {\n          if (data[config] === undefined) {\n            throw new Error(`No method named \"${config}\"`)\n          }\n          data[config].call(this)\n        }\n      })\n    }\n\n    static _clearMenus(event) {\n      if (event && event.which === RIGHT_MOUSE_BUTTON_WHICH) {\n        return\n      }\n\n      const toggles = $.makeArray($(Selector.DATA_TOGGLE))\n\n      for (let i = 0; i < toggles.length; i++) {\n        const parent        = Dropdown._getParentFromElement(toggles[i])\n        const relatedTarget = {\n          relatedTarget : toggles[i]\n        }\n\n        if (!$(parent).hasClass(ClassName.SHOW)) {\n          continue\n        }\n\n        if (event && (event.type === 'click' &&\n            /input|textarea/i.test(event.target.tagName) || event.type === 'focusin')\n            && $.contains(parent, event.target)) {\n          continue\n        }\n\n        const hideEvent = $.Event(Event.HIDE, relatedTarget)\n        $(parent).trigger(hideEvent)\n        if (hideEvent.isDefaultPrevented()) {\n          continue\n        }\n\n        // remove backdrop only if the dropdown menu will be hidden\n        const backdrop = $(parent).find(Selector.BACKDROP)[0]\n        if (backdrop) {\n          backdrop.parentNode.removeChild(backdrop)\n        }\n\n        toggles[i].setAttribute('aria-expanded', 'false')\n\n        $(parent)\n          .removeClass(ClassName.SHOW)\n          .trigger($.Event(Event.HIDDEN, relatedTarget))\n      }\n    }\n\n    static _getParentFromElement(element) {\n      let parent\n      const selector = Util.getSelectorFromElement(element)\n\n      if (selector) {\n        parent = $(selector)[0]\n      }\n\n      return parent || element.parentNode\n    }\n\n    static _dataApiKeydownHandler(event) {\n      if (!REGEXP_KEYDOWN.test(event.which) ||\n         /input|textarea/i.test(event.target.tagName)) {\n        return\n      }\n\n      event.preventDefault()\n      event.stopPropagation()\n\n      if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {\n        return\n      }\n\n      const parent   = Dropdown._getParentFromElement(this)\n      const isActive = $(parent).hasClass(ClassName.SHOW)\n\n      if (!isActive && event.which !== ESCAPE_KEYCODE ||\n           isActive && event.which === ESCAPE_KEYCODE) {\n\n        if (event.which === ESCAPE_KEYCODE) {\n          const toggle = $(parent).find(Selector.DATA_TOGGLE)[0]\n          $(toggle).trigger('focus')\n        }\n\n        $(this).trigger('click')\n        return\n      }\n\n      const items = $(parent).find(Selector.VISIBLE_ITEMS).get()\n\n      if (!items.length) {\n        return\n      }\n\n      let index = items.indexOf(event.target)\n\n      if (event.which === ARROW_UP_KEYCODE && index > 0) { // up\n        index--\n      }\n\n      if (event.which === ARROW_DOWN_KEYCODE && index < items.length - 1) { // down\n        index++\n      }\n\n      if (index < 0) {\n        index = 0\n      }\n\n      items[index].focus()\n    }\n\n  }\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Data Api implementation\n   * ------------------------------------------------------------------------\n   */\n\n  $(document)\n    .on(Event.KEYDOWN_DATA_API, Selector.DATA_TOGGLE,  Dropdown._dataApiKeydownHandler)\n    .on(Event.KEYDOWN_DATA_API, Selector.ROLE_MENU,    Dropdown._dataApiKeydownHandler)\n    .on(Event.KEYDOWN_DATA_API, Selector.ROLE_LISTBOX, Dropdown._dataApiKeydownHandler)\n    .on(`${Event.CLICK_DATA_API} ${Event.FOCUSIN_DATA_API}`, Dropdown._clearMenus)\n    .on(Event.CLICK_DATA_API, Selector.DATA_TOGGLE, Dropdown.prototype.toggle)\n    .on(Event.CLICK_DATA_API, Selector.FORM_CHILD, (e) => {\n      e.stopPropagation()\n    })\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * jQuery\n   * ------------------------------------------------------------------------\n   */\n\n  $.fn[NAME]             = Dropdown._jQueryInterface\n  $.fn[NAME].Constructor = Dropdown\n  $.fn[NAME].noConflict  = function () {\n    $.fn[NAME] = JQUERY_NO_CONFLICT\n    return Dropdown._jQueryInterface\n  }\n\n  return Dropdown\n\n})(jQuery)\n\nexport default Dropdown\n"]}
\ No newline at end of file
diff --git a/js/dist/util.js b/js/dist/util.js
index 2fda21d535..6eadcc31b9 100644
--- a/js/dist/util.js
+++ b/js/dist/util.js
@@ -111,13 +111,16 @@ var Util = function ($) {
     },
     getSelectorFromElement: function getSelectorFromElement(element) {
       var selector = element.getAttribute('data-target');
-
-      if (!selector) {
+      if (!selector || selector === '#') {
         selector = element.getAttribute('href') || '';
-        selector = /^#[a-z]/i.test(selector) ? selector : null;
       }
 
-      return selector;
+      try {
+        var $selector = $(selector);
+        return $selector.length > 0 ? selector : null;
+      } catch (error) {
+        return null;
+      }
     },
     reflow: function reflow(element) {
       return element.offsetHeight;
diff --git a/js/dist/util.js.map b/js/dist/util.js.map
index b9d4790880..011bc69b8b 100644
--- a/js/dist/util.js.map
+++ b/js/dist/util.js.map
@@ -1 +1 @@
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* --------------------------------------------------------------------------\n * Bootstrap (v4.0.0-alpha.6): util.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)\n * --------------------------------------------------------------------------\n */\n\nconst Util = (($) => {\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Private TransitionEnd Helpers\n   * ------------------------------------------------------------------------\n   */\n\n  let transition = false\n\n  const MAX_UID = 1000000\n\n  const TransitionEndEvent = {\n    WebkitTransition : 'webkitTransitionEnd',\n    MozTransition    : 'transitionend',\n    OTransition      : 'oTransitionEnd otransitionend',\n    transition       : 'transitionend'\n  }\n\n  // shoutout AngusCroll (https://goo.gl/pxwQGp)\n  function toType(obj) {\n    return {}.toString.call(obj).match(/\\s([a-zA-Z]+)/)[1].toLowerCase()\n  }\n\n  function isElement(obj) {\n    return 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\"${expectedTypes}\".`)\n          }\n        }\n      }\n    }\n  }\n\n  setTransitionEndSupport()\n\n  return Util\n\n})(jQuery)\n\nexport default Util\n"]}
\ No newline at end of file
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* --------------------------------------------------------------------------\n * Bootstrap (v4.0.0-alpha.6): util.js\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)\n * --------------------------------------------------------------------------\n */\n\nconst Util = (($) => {\n\n\n  /**\n   * ------------------------------------------------------------------------\n   * Private TransitionEnd Helpers\n   * ------------------------------------------------------------------------\n   */\n\n  let transition = false\n\n  const MAX_UID = 1000000\n\n  const TransitionEndEvent = {\n    WebkitTransition : 'webkitTransitionEnd',\n    MozTransition    : 'transitionend',\n    OTransition      : 'oTransitionEnd otransitionend',\n    transition       : 'transitionend'\n  }\n\n  // shoutout AngusCroll (https://goo.gl/pxwQGp)\n  function toType(obj) {\n    return {}.toString.call(obj).match(/\\s([a-zA-Z]+)/)[1].toLowerCase()\n  }\n\n  function isElement(obj) {\n    return 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element.getAttribute('href') || ''\n      }\n\n      try {\n        const $selector = $(selector)\n        return $selector.length > 0 ? selector : null\n      } catch (error) {\n        return null\n      }\n    },\n\n    reflow(element) {\n      return element.offsetHeight\n    },\n\n    triggerTransitionEnd(element) {\n      $(element).trigger(transition.end)\n    },\n\n    supportsTransitionEnd() {\n      return Boolean(transition)\n    },\n\n    typeCheckConfig(componentName, config, configTypes) {\n      for (const property in configTypes) {\n        if (configTypes.hasOwnProperty(property)) {\n          const expectedTypes = configTypes[property]\n          const value         = config[property]\n          const valueType     = value && isElement(value) ?\n                                'element' : toType(value)\n\n          if (!new RegExp(expectedTypes).test(valueType)) {\n            throw new Error(\n              `${componentName.toUpperCase()}: ` +\n              `Option \"${property}\" provided type \"${valueType}\" ` +\n              `but expected type \"${expectedTypes}\".`)\n          }\n        }\n      }\n    }\n  }\n\n  setTransitionEndSupport()\n\n  return Util\n\n})(jQuery)\n\nexport default Util\n"]}
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