From 1a0a0858efa0e1e3c6bebd38058df8ad39ca27a5 Mon Sep 17 00:00:00 2001
From: Martijn Cuppens <martijn.cuppens@gmail.com>
Date: Sat, 2 May 2020 11:11:24 +0200
Subject: Remove checkbox/radio toggle from button plugin in favor of a CSS
 only solution

---
 js/src/button.js             |  78 ++-------------------
 js/tests/unit/button.spec.js | 161 -------------------------------------------
 2 files changed, 5 insertions(+), 234 deletions(-)

(limited to 'js')

diff --git a/js/src/button.js b/js/src/button.js
index 67f3b96279..fd29e5218b 100644
--- a/js/src/button.js
+++ b/js/src/button.js
@@ -8,7 +8,6 @@
 import { getjQuery } from './util/index'
 import Data from './dom/data'
 import EventHandler from './dom/event-handler'
-import SelectorEngine from './dom/selector-engine'
 
 /**
  * ------------------------------------------------------------------------
@@ -23,18 +22,10 @@ const EVENT_KEY = `.${DATA_KEY}`
 const DATA_API_KEY = '.data-api'
 
 const CLASS_NAME_ACTIVE = 'active'
-const CLASS_NAME_DISABLED = 'disabled'
-const CLASS_NAME_FOCUS = 'focus'
 
-const SELECTOR_DATA_TOGGLE_CARROT = '[data-toggle^="button"]'
-const SELECTOR_DATA_TOGGLE = '[data-toggle="buttons"]'
-const SELECTOR_INPUT = 'input:not([type="hidden"])'
-const SELECTOR_ACTIVE = '.active'
-const SELECTOR_BUTTON = '.btn'
+const SELECTOR_DATA_TOGGLE = '[data-toggle="button"]'
 
 const EVENT_CLICK_DATA_API = `click${EVENT_KEY}${DATA_API_KEY}`
-const EVENT_FOCUS_DATA_API = `focus${EVENT_KEY}${DATA_API_KEY}`
-const EVENT_BLUR_DATA_API = `blur${EVENT_KEY}${DATA_API_KEY}`
 
 /**
  * ------------------------------------------------------------------------
@@ -57,51 +48,8 @@ class Button {
   // Public
 
   toggle() {
-    let triggerChangeEvent = true
-    let addAriaPressed = true
-
-    const rootElement = this._element.closest(SELECTOR_DATA_TOGGLE)
-
-    if (rootElement) {
-      const input = SelectorEngine.findOne(SELECTOR_INPUT, this._element)
-
-      if (input && input.type === 'radio') {
-        if (input.checked &&
-          this._element.classList.contains(CLASS_NAME_ACTIVE)) {
-          triggerChangeEvent = false
-        } else {
-          const activeElement = SelectorEngine.findOne(SELECTOR_ACTIVE, rootElement)
-
-          if (activeElement) {
-            activeElement.classList.remove(CLASS_NAME_ACTIVE)
-          }
-        }
-
-        if (triggerChangeEvent) {
-          if (input.hasAttribute('disabled') ||
-            rootElement.hasAttribute('disabled') ||
-            input.classList.contains(CLASS_NAME_DISABLED) ||
-            rootElement.classList.contains(CLASS_NAME_DISABLED)) {
-            return
-          }
-
-          input.checked = !this._element.classList.contains(CLASS_NAME_ACTIVE)
-          EventHandler.trigger(input, 'change')
-        }
-
-        input.focus()
-        addAriaPressed = false
-      }
-    }
-
-    if (addAriaPressed) {
-      this._element.setAttribute('aria-pressed',
-        !this._element.classList.contains(CLASS_NAME_ACTIVE))
-    }
-
-    if (triggerChangeEvent) {
-      this._element.classList.toggle(CLASS_NAME_ACTIVE)
-    }
+    // Toggle class and sync the `aria-pressed` attribute with the return value of the `.toggle()` method
+    this._element.setAttribute('aria-pressed', this._element.classList.toggle(CLASS_NAME_ACTIVE))
   }
 
   dispose() {
@@ -136,10 +84,10 @@ class Button {
  * ------------------------------------------------------------------------
  */
 
-EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE_CARROT, event => {
+EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, event => {
   event.preventDefault()
 
-  const button = event.target.closest(SELECTOR_BUTTON)
+  const button = event.target.closest(SELECTOR_DATA_TOGGLE)
 
   let data = Data.getData(button, DATA_KEY)
   if (!data) {
@@ -149,22 +97,6 @@ EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE_CARROT, eve
   data.toggle()
 })
 
-EventHandler.on(document, EVENT_FOCUS_DATA_API, SELECTOR_DATA_TOGGLE_CARROT, event => {
-  const button = event.target.closest(SELECTOR_BUTTON)
-
-  if (button) {
-    button.classList.add(CLASS_NAME_FOCUS)
-  }
-})
-
-EventHandler.on(document, EVENT_BLUR_DATA_API, SELECTOR_DATA_TOGGLE_CARROT, event => {
-  const button = event.target.closest(SELECTOR_BUTTON)
-
-  if (button) {
-    button.classList.remove(CLASS_NAME_FOCUS)
-  }
-})
-
 const $ = getjQuery()
 
 /**
diff --git a/js/tests/unit/button.spec.js b/js/tests/unit/button.spec.js
index f7caf23f62..ac32b4b897 100644
--- a/js/tests/unit/button.spec.js
+++ b/js/tests/unit/button.spec.js
@@ -1,11 +1,9 @@
 import Button from '../../src/button'
-import EventHandler from '../../src/dom/event-handler'
 
 /** Test helpers */
 import {
   getFixture,
   clearFixture,
-  createEvent,
   jQueryMock
 } from '../helpers/fixture'
 
@@ -51,144 +49,6 @@ describe('Button', () => {
 
       expect(btnTestParent.classList.contains('active')).toEqual(true)
     })
-
-    it('should trigger input change event when toggled button has input field', done => {
-      fixtureEl.innerHTML = [
-        '<div class="btn-group" data-toggle="buttons">',
-        '  <label class="btn btn-primary">',
-        '    <input type="radio" id="radio" autocomplete="off"> Radio',
-        '  </label>',
-        '</div>'
-      ].join('')
-
-      const input = fixtureEl.querySelector('input')
-      const label = fixtureEl.querySelector('label')
-
-      input.addEventListener('change', () => {
-        expect().nothing()
-        done()
-      })
-
-      label.click()
-    })
-
-    it('should not trigger input change event when input already checked and button is active', () => {
-      fixtureEl.innerHTML = [
-        '<button type="button" class="btn btn-primary active" data-toggle="buttons">',
-        '  <input type="radio" id="radio" autocomplete="off" checked> Radio',
-        '</button>'
-      ].join('')
-
-      const button = fixtureEl.querySelector('button')
-
-      spyOn(EventHandler, 'trigger')
-
-      button.click()
-
-      expect(EventHandler.trigger).not.toHaveBeenCalled()
-    })
-
-    it('should remove active when an other radio button is clicked', () => {
-      fixtureEl.innerHTML = [
-        '<div class="btn-group btn-group-toggle" data-toggle="buttons">',
-        ' <label class="btn btn-secondary active">',
-        '   <input type="radio" name="options" id="option1" autocomplete="off" checked> Active',
-        ' </label>',
-        ' <label class="btn btn-secondary">',
-        '   <input type="radio" name="options" id="option2" autocomplete="off"> Radio',
-        ' </label>',
-        ' <label class="btn btn-secondary">',
-        '   <input type="radio" name="options" id="option3" autocomplete="off"> Radio',
-        ' </label>',
-        '</div>'
-      ].join('')
-
-      const option1 = fixtureEl.querySelector('#option1')
-      const option2 = fixtureEl.querySelector('#option2')
-
-      expect(option1.checked).toEqual(true)
-      expect(option1.parentElement.classList.contains('active')).toEqual(true)
-
-      const clickEvent = createEvent('click')
-
-      option2.dispatchEvent(clickEvent)
-
-      expect(option1.checked).toEqual(false)
-      expect(option1.parentElement.classList.contains('active')).toEqual(false)
-      expect(option2.checked).toEqual(true)
-      expect(option2.parentElement.classList.contains('active')).toEqual(true)
-    })
-
-    it('should do nothing if the child is not an input', () => {
-      fixtureEl.innerHTML = [
-        '<div class="btn-group btn-group-toggle" data-toggle="buttons">',
-        ' <label class="btn btn-secondary active">',
-        '   <span id="option1">el 1</span>',
-        ' </label>',
-        ' <label class="btn btn-secondary">',
-        '   <span id="option2">el 2</span>',
-        ' </label>',
-        ' <label class="btn btn-secondary">',
-        '   <span>el 3</span>',
-        ' </label>',
-        '</div>'
-      ].join('')
-
-      const option2 = fixtureEl.querySelector('#option2')
-      const clickEvent = createEvent('click')
-
-      option2.dispatchEvent(clickEvent)
-
-      expect().nothing()
-    })
-
-    it('should add focus class on focus event', () => {
-      fixtureEl.innerHTML = '<button class="btn" data-toggle="button"><input type="text"></button>'
-
-      const btn = fixtureEl.querySelector('.btn')
-      const input = fixtureEl.querySelector('input')
-
-      const focusEvent = createEvent('focus')
-      input.dispatchEvent(focusEvent)
-
-      expect(btn.classList.contains('focus')).toEqual(true)
-    })
-
-    it('should not add focus class', () => {
-      fixtureEl.innerHTML = '<button data-toggle="button"><input type="text"></button>'
-
-      const btn = fixtureEl.querySelector('button')
-      const input = fixtureEl.querySelector('input')
-
-      const focusEvent = createEvent('focus')
-      input.dispatchEvent(focusEvent)
-
-      expect(btn.classList.contains('focus')).toEqual(false)
-    })
-
-    it('should remove focus class on blur event', () => {
-      fixtureEl.innerHTML = '<button class="btn focus" data-toggle="button"><input type="text"></button>'
-
-      const btn = fixtureEl.querySelector('.btn')
-      const input = fixtureEl.querySelector('input')
-
-      const focusEvent = createEvent('blur')
-      input.dispatchEvent(focusEvent)
-
-      expect(btn.classList.contains('focus')).toEqual(false)
-    })
-
-    it('should not remove focus class on blur event', () => {
-      fixtureEl.innerHTML = '<button class="focus" data-toggle="button"><input type="text"></button>'
-
-      const btn = fixtureEl.querySelector('button')
-      const input = fixtureEl.querySelector('input')
-
-      const focusEvent = createEvent('blur')
-      input.dispatchEvent(focusEvent)
-
-      expect(btn.classList.contains('focus')).toEqual(true)
-    })
   })
 
   describe('toggle', () => {
@@ -206,27 +66,6 @@ describe('Button', () => {
       expect(btnEl.getAttribute('aria-pressed')).toEqual('true')
       expect(btnEl.classList.contains('active')).toEqual(true)
     })
-
-    it('should handle disabled attribute on non-button elements', () => {
-      fixtureEl.innerHTML = [
-        '<div class="btn-group disabled" data-toggle="buttons" aria-disabled="true" disabled>',
-        '  <label class="btn btn-danger disabled" aria-disabled="true" disabled>',
-        '    <input type="checkbox" aria-disabled="true" autocomplete="off" disabled class="disabled">',
-        '  </label>',
-        '</div>'
-      ].join('')
-
-      const btnGroupEl = fixtureEl.querySelector('.btn-group')
-      const btnDanger = fixtureEl.querySelector('.btn-danger')
-      const input = fixtureEl.querySelector('input')
-
-      const button = new Button(btnGroupEl)
-
-      button.toggle()
-
-      expect(btnDanger.hasAttribute('disabled')).toEqual(true)
-      expect(input.checked).toEqual(false)
-    })
   })
 
   describe('dispose', () => {
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