How to get the first few child elements in jquery-Front-end Q&A-php.cn

How to get the first few child elements in jquery

青灯夜游

Release： 2022-07-25 16:25:56

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The steps for jquery to obtain the first few child elements: 1. Use the children() function to obtain all child elements. The syntax "parent element.children();" will return a jquery object containing all child elements; 2. . Use the :lt() selector to narrow the range of child elements obtained by children(). The syntax "parent element.children(:lt(index))" will only obtain the child elements whose index value is less than the specified number and return it.

How to get the first few child elements in jquery

The operating environment of this tutorial: windows7 system, jquery3.6.0 version, Dell G3 computer.

In jquery, you can use the children() function and the :lt() selector to get the first few child elements.

Implementation steps:

Step 1: Use children() to get all child elements

children() You can get all direct child elements under the specified parent node

父元素.children()

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will return a jquery object containing all child elements

Step 2: Use:lt(index)Selector gets the first few child elements

Use: lt() selector to narrow the range of child elements obtained by children(), and only get elements whose index value is less than the specified number.

父元素.children(:lt(index))

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This will return a jquery object containing the first several child elements

Complete sample code: Get the first two child elements li of the parent element ul

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<script src="js/jquery-3.6.0.min.js"></script>
		<script>
			$(function () {
            $("button").click(function () {
				$("ul").children("li:lt(2)").css("background-color","red");
            })
        })
    </script>
	<style type="text/css">
		ul{
			background-color:yellow;
		}
		li{
			border:1px solid red;
			margin:10px;
		}
	</style>
	</head>
	<body>
		<ul>
			<li>香蕉</li>
			<li>苹果</li>
			<li>梨子</li>
			<li>橘子</li>
		</ul>
		<button>父元素ul的前2个子元素li</button>
	</body>
</html>

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How to get the first few child elements in jquery

Description: The

children() method returns all direct child elements of the selected element.

$(selector).children(filter)

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Parameter	Description
filter	Can select. Specifies a selector expression that narrows the search for child elements.

:lt(index) The selector selects elements whose index value is less than the specified number.

index values start from 0.

The most common usage: used with other selectors to select elements before a specific sequence number in the specified combination (such as the example above).

[Recommended learning: jQuery video tutorial, web front-end video]

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