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How to query child elements with jquery

青灯夜游

Release： 2022-03-18 14:52:22

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How to query child elements in jquery: 1. Use the children() method to get the direct subset elements under the specified element; 2. Use the find() method to get all the elements under the specified element (including children). subset of a set) subset element.

How to query child elements with jquery

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

jQuery child element selector find() and children()

children() method: Get the element The direct subset element under
find() method: Get all (including subsets of subsets) subset elements under this element

<html>
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		div{
			/*background-color: pink;*/
		}
	</style>
</head>
<body>
    <div>
    	<span>11</span>
    	<span>
    		<ul>
    			<li class="no1">aaa</li>
    			<li>bbb</li>
    			<li>ccc</li>
    		</ul>
    	</span>
    	<span>222</span>
    	<ul>
    		<li>ddd</li>
    		<li>eee</li>
    		<li>fff</li>
    	</ul>
    </div>
 
 
</body>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
	$("div").children(".no1").css({color:&#39;#a61c00&#39;,backgroundColor:"#0000ff"});
	console.log($("div").children(".no1")[0]); // 打印获取到的dom元素 这时你会发现结果为 undefined 
 
	// $("div").find(".no1").css({color:&#39;#a61c00&#39;,backgroundColor:"#0000ff"});
</script>
</html>

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How to query child elements with jquery

At this point we will open the find item and comment

<html>
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		div{
			/*background-color: pink;*/
		}
	</style>
</head>
<body>
    <div>
    	<span>11</span>
    	<span>
    		<ul>
    			<li class="no1">aaa</li>
    			<li>bbb</li>
    			<li>ccc</li>
    		</ul>
    	</span>
    	<span>222</span>
    	<ul>
    		<li>ddd</li>
    		<li>eee</li>
    		<li>fff</li>
    	</ul>
    </div>
 
</body>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>
	// $("div").children(".no1").css({color:&#39;#a61c00&#39;,backgroundColor:"#0000ff"});
	// console.log($("div").children(".no1")[0]);
 
 
	$("div").find(".no1").css({color:&#39;#a61c00&#39;,backgroundColor:"#0000ff"});
	console.log($("div").find(".no1")[0]);
</script>
</html>

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Corresponding screenshot:

How to query child elements with jquery

Summarize the differences :

The children() method returns all direct child elements of the selected element (direct child elements, only sons and not grandchildren (: that is to say, no recursive traversal)

## The #find() method obtains the descendants of each element in the current element collection (note that the find() method must pass parameters, otherwise it will be invalid)

[Recommended learning:

jQuery video tutorial, web front end】

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