【JS】JavaScript：事件：冒泡和捕获机制

• Z时代
• 2024-01-10
• 分类：技术分享

一般的事件处理不需要考虑这种情况。但是，这不仅是一个常见面试题，而且有其实际使用场景。

演示准备

1. 有父子两个元素

   <div id="propagate"> <p> 源栈欢迎您 </p> </div>

   为了便于演示，加上一点CSS效果：

   <style> #propagate { padding: 30px; border: 1px solid; } #propagate > p { background-color: blue; border: 1px dashed; } </style>

2. 都注册了事件

   var father = document.getElementById('propagate'), child = father.children[0]; father.addEventListener('click', function (event) { console.log('event handler on father'); }); child.addEventListener('click', function () { console.log('event handler on child'); });

3. 用户点击在子元素上

@想一想@：

1. 这是不是也同时点在了父元素上？
2. 所以，是不是一次事件就会调用两个handler？
3. 那么，先触发的是子元素，还是父元素呢？

演示：略

冒泡和捕获

浏览器大战_（复习）_的年代，不同的浏览器使用了不同的机制来处理这种场景

• 冒泡（bubble）：事件从内向外传递，先触发子元素事件，再触发父元素的
• 捕获（capture）：事件从外向内传递，先触发父元素事件，再触发子元素的

现代浏览器都按W3C标准进行了统一。

当事件行为发生时，有两个“传播”阶段：首先由外向内“捕获”，然后再从内向外“冒泡”，如下图所示。

addEventListener()控制

那为什么上述演示的结果感觉是只有“冒泡”呢？

因为我们在绑定事件时（默认）指明了：该事件处理程序只适用/响应于冒泡阶段。

addEventListener()还有第三个参数useCapture，当其为

• false：事件绑定在冒泡阶段（默认）
• true：事件绑定在捕获阶段

演示：

father.addEventListener('click', function (event) { console.log('event handler on father'); }, true); child.addEventListener('click', function () { console.log('event handler on child'); }, true);

以及：__父true子false，父false子true

理解：上述（由浏览器控制的）①②③④四个阶段始终是存在的，我们能控制的是：事件处理程序（handler）在哪一个阶段（phase）予以响应。

两个Target

现在我们来看一个真实的适用场景：给一个父元素里面的所有子元素绑定click事件。

<div id="propagate"> <p> 源栈欢迎您 </p> <p> 大神小班 </p> <p> 灵活学制 </p> </div>

要求显示_用户所点击DOM元素_（如何确定？能不能用this？）的文本。

实际上，这里面可以使用的有三个对象：

• event.currentTarget（等同于this）：JavaScript代码中绑定事件的DOM元素
• event.target：(用户)点击的DOM元素

father.addEventListener('click', function (event) { console.log('this === event.target:' + (this === event.target)); console.log('event.target:' + event.target.innerHTML); //符合题意需求 console.log('this === event.currentTarget:' + (this === event.currentTarget)); console.log('event.currentTarget:' + event.currentTarget.innerHTML); });

@试一试@：当在父子元素上都绑定了事件之后，又各自使用冒泡/捕获，会是一种什么情形？

stopPropagation()

可以想象，事件冒泡/捕获机制极有可能会带来胡乱，所以有时候我们需要：阻止事件（行为）继续向上传递，这就需要调用：

event.stopPropagation();

注意：propagation包含冒泡和捕获

演示：采用冒泡/捕获，在父子元素事件handler中添加__stopPropagation()

常见面试题

问：stopPropagation()和preventDefault()的区别？

• 联系：都是event方法，都能阻止事件发生

• 区别：

  • preventDefault()阻止的DOM元素默认的（不是我们JavaScript开发人员绑定的）事件，如提交按钮的提交，超链接的跳转……
  • stopPropagation()阻止的不是事件本身，是事件的传播，通过阻止事件传播阻止JavaScript开发人员的绑定事件

作业

1. 用代码和PPT演示：事件的冒泡和排序传播https://github.com/hdfgfgh546...

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