How to get bubbling elements in js event bubbling-JS Tutorial-php.cn

How to get bubbling elements in js event bubbling

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Release： 2024-02-20 09:13:36

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How to get bubbling elements in js event bubbling

How to get the bubbling element in js event bubbling, you need specific code examples

Event bubbling means that when an event on an element is triggered, its upper layer The parent element will also receive this event. In JavaScript, bubbling elements can be obtained through event objects. Below, I'll give you a concrete code example to explain how to get the bubbling element.

First, we need an HTML page that contains nested elements, as shown below:

<!DOCTYPE html>
<html>
<head>
<title>事件冒泡示例</title>
</head>
<body>
  <div id="outer">
    <div id="inner">
      <button id="button">点击我</button>
    </div>
  </div>

<script src="script.js"></script>
</body>
</html>

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In this page, we have an outer div element (id is "outer "), an inner div element (id is "inner"), and a button element (id is "button").

Next, we need a JavaScript file to handle event bubbling and get the bubbling element. In the script.js file, we will handle the click event and obtain the id of the bubbling element. The code is as follows:

// 获取外层div元素
var outer = document.getElementById('outer');

// 绑定点击事件处理函数
outer.addEventListener('click', function(event) {
  // 获取冒泡元素的id
  var bubbleElementId = event.target.id;
  
  // 打印冒泡元素的id
  console.log('冒泡元素的id：', bubbleElementId);
});

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In the above code, we first obtain the outer div element through the getElementById method, and then use the addEventListener method to bind a click event handler to it. In the event processing function, the target attribute of the event object is used to obtain the element that triggered the event, that is, the bubbling element. Then, we get the id of the bubble element through the id attribute of the target element. Finally, we use the console.log method to print the bubbled element's id to the browser's console.

When we click the button on the page, the event will bubble up to the outer div, and then we can see the id output of the bubbled element in the console.

Through the above code examples, we can clearly understand how to get bubble elements in JavaScript.

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