bubbling and capturing in javascript

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Coco
23 Jan 2016
1// prevent bubbling effect
2function DownloadAsset(AssetId, e) {
3
4    if (!e) var e = window.event
5    e.cancelBubble = true;
6    if (e.stopPropagation) e.stopPropagation();
7
8    // your ajax call
9    $.ajax({....})
10}
source
Karl
02 Oct 2018
1var logElement = document.getElementById('log');
2
3function log(msg) {
4    logElement.innerHTML += ('<p>' + msg + '</p>');
5}
6
7function capture() {
8    log('capture: ' + this.firstChild.nodeValue.trim());
9}
10
11function bubble() {
12    log('bubble: ' + this.firstChild.nodeValue.trim());
13}
14
15function clearOutput() {
16    logElement.innerHTML = "";
17}
18
19var divs = document.getElementsByTagName('div');
20for (var i = 0; i < divs.length; i++) {
21    divs[i].addEventListener('click', capture, true);
22    divs[i].addEventListener('click', bubble, false);
23}
24var clearButton = document.getElementById('clear');
25clearButton.addEventListener('click', clearOutput);
source
Simon
29 Feb 2017
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}
source
Olivia
14 Mar 2017
1<div>1
2    <div>2
3        <div>3
4            <div>4
5                <div>5</div>
6            </div>
7        </div>
8    </div>
9</div>
10<button id="clear">clear output</button>
11<section id="log"></section>
source
Josué
01 Jan 2021
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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