Fix handling of transitionend events dispatched by nested elements(#33845)

Fix handling of transitionend events dispatched by nested elements
Properly handle events from nested elements

Change `emulateTransitionEnd` to `executeAfterTransition` &&

js/src/base-component.js

@@ -7,10 +7,8 @@
 
 import Data from './dom/data'
 import {
-  emulateTransitionEnd,
-  execute,
-  getElement,
-  getTransitionDurationFromElement
+  executeAfterTransition,
+  getElement
 } from './util/index'
 import EventHandler from './dom/event-handler'
 
@@ -44,15 +42,7 @@ class BaseComponent {
   }
 
   _queueCallback(callback, element, isAnimated = true) {
-    if (!isAnimated) {
-      execute(callback)
-      return
-    }
-
-    const transitionDuration = getTransitionDurationFromElement(element)
-    EventHandler.one(element, 'transitionend', () => execute(callback))
-
-    emulateTransitionEnd(element, transitionDuration)
+    executeAfterTransition(callback, element, isAnimated)
   }
 
   /** Static */

js/src/modal.js

@@ -7,9 +7,7 @@
 
 import {
   defineJQueryPlugin,
-  emulateTransitionEnd,
   getElementFromSelector,
-  getTransitionDurationFromElement,
   isRTL,
   isVisible,
   reflow,
@@ -339,25 +337,28 @@ class Modal extends BaseComponent {
       return
     }
 
-    const isModalOverflowing = this._element.scrollHeight > document.documentElement.clientHeight
+    const { classList, scrollHeight, style } = this._element
+    const isModalOverflowing = scrollHeight > document.documentElement.clientHeight
 
-    if (!isModalOverflowing) {
-      this._element.style.overflowY = 'hidden'
+    // return if the following background transition hasn't yet completed
+    if ((!isModalOverflowing && style.overflowY === 'hidden') || classList.contains(CLASS_NAME_STATIC)) {
+      return
     }
 
-    this._element.classList.add(CLASS_NAME_STATIC)
-    const modalTransitionDuration = getTransitionDurationFromElement(this._dialog)
-    EventHandler.off(this._element, 'transitionend')
-    EventHandler.one(this._element, 'transitionend', () => {
-      this._element.classList.remove(CLASS_NAME_STATIC)
+    if (!isModalOverflowing) {
+      style.overflowY = 'hidden'
+    }
+
+    classList.add(CLASS_NAME_STATIC)
+    this._queueCallback(() => {
+      classList.remove(CLASS_NAME_STATIC)
       if (!isModalOverflowing) {
-        EventHandler.one(this._element, 'transitionend', () => {
-          this._element.style.overflowY = ''
-        })
-        emulateTransitionEnd(this._element, modalTransitionDuration)
+        this._queueCallback(() => {
+          style.overflowY = ''
+        }, this._dialog)
       }
-    })
-    emulateTransitionEnd(this._element, modalTransitionDuration)
+    }, this._dialog)
+
     this._element.focus()
   }
 

js/src/util/backdrop.js

@@ -6,7 +6,7 @@
  */
 
 import EventHandler from '../dom/event-handler'
-import { emulateTransitionEnd, execute, getElement, getTransitionDurationFromElement, reflow, typeCheckConfig } from './index'
+import { execute, executeAfterTransition, getElement, reflow, typeCheckConfig } from './index'
 
 const Default = {
   isVisible: true, // if false, we use the backdrop helper without adding any element to the dom
@@ -122,14 +122,7 @@ class Backdrop {
   }
 
   _emulateAnimation(callback) {
-    if (!this._config.isAnimated) {
-      execute(callback)
-      return
-    }
-
-    const backdropTransitionDuration = getTransitionDurationFromElement(this._getElement())
-    EventHandler.one(this._getElement(), 'transitionend', () => execute(callback))
-    emulateTransitionEnd(this._getElement(), backdropTransitionDuration)
+    executeAfterTransition(callback, this._getElement(), this._config.isAnimated)
   }
 }
 

js/src/util/index.js

@@ -126,24 +126,6 @@ const getElement = obj => {
   return null
 }
 
-const emulateTransitionEnd = (element, duration) => {
-  let called = false
-  const durationPadding = 5
-  const emulatedDuration = duration + durationPadding
-
-  function listener() {
-    called = true
-    element.removeEventListener(TRANSITION_END, listener)
-  }
-
-  element.addEventListener(TRANSITION_END, listener)
-  setTimeout(() => {
-    if (!called) {
-      triggerTransitionEnd(element)
-    }
-  }, emulatedDuration)
-}
-
 const typeCheckConfig = (componentName, config, configTypes) => {
   Object.keys(configTypes).forEach(property => {
     const expectedTypes = configTypes[property]
@@ -252,6 +234,35 @@ const execute = callback => {
   }
 }
 
+const executeAfterTransition = (callback, transitionElement, waitForTransition = true) => {
+  if (!waitForTransition) {
+    execute(callback)
+    return
+  }
+
+  const durationPadding = 5
+  const emulatedDuration = getTransitionDurationFromElement(transitionElement) + durationPadding
+
+  let called = false
+
+  const handler = ({ target }) => {
+    if (target !== transitionElement) {
+      return
+    }
+
+    called = true
+    transitionElement.removeEventListener(TRANSITION_END, handler)
+    execute(callback)
+  }
+
+  transitionElement.addEventListener(TRANSITION_END, handler)
+  setTimeout(() => {
+    if (!called) {
+      triggerTransitionEnd(transitionElement)
+    }
+  }, emulatedDuration)
+}
+
 /**
  * Return the previous/next element of a list.
  *
@@ -288,7 +299,6 @@ export {
   getTransitionDurationFromElement,
   triggerTransitionEnd,
   isElement,
-  emulateTransitionEnd,
   typeCheckConfig,
   isVisible,
   isDisabled,
@@ -300,5 +310,6 @@ export {
   onDOMContentLoaded,
   isRTL,
   defineJQueryPlugin,
-  execute
+  execute,
+  executeAfterTransition
 }