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showing results for - "what is event bubbling in javascript with example"
Federico
20 Apr 2020
1p {
2    line-height: 0;
3}
4
5div {
6    display:inline-block;
7    padding: 5px;
8
9    background: #fff;
10    border: 1px solid #aaa;
11    cursor: pointer;
12}
13
14div:hover {
15    border: 1px solid #faa;
16    background: #fdd;
17}
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Leah
01 Apr 2019
1<script>
2	form.onclick = function(event) {
3  event.target.style.backgroundColor = 'yellow';
4
5  // chrome needs some time to paint yellow
6  setTimeout(() => {
7    alert("target = " + event.target.tagName + ", this=" + this.tagName);
8    event.target.style.backgroundColor = ''
9  }, 0);
10};
11</script>
12<html>
13<head>
14  <meta charset="utf-8">
15  <link rel="stylesheet" href="example.css">
16</head>
17
18<body>
19  A click shows both <code>event.target</code> and <code>this</code> to compare:
20
21  <form id="form">FORM
22    <div>DIV
23      <p>P</p>
24    </div>
25  </form>
26</body>
27</html>
28
29<!-- A handler on a parent element can always get the details about where it actually happened.
30
31The most deeply nested element that caused the event is called a target element, accessible as event.target.
32
33Note the differences from this (=event.currentTarget):
34
35event.target – is the “target” element that initiated the event, it doesn’t change through the bubbling process.
36this – is the “current” element, the one that has a currently running handler on it.
37For instance, if we have a single handler form.onclick, then it can “catch” all clicks inside the form. No matter where the click happened, it bubbles up to <form> and runs the handler.
38
39In form.onclick handler:
40
41this (=event.currentTarget) is the <form> element, because the handler runs on it.
42event.target is the actual element inside the form that was clicked. -->
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