How to query the number of child elements in jquery: 1. Use the children() function to obtain and return a collection containing all child elements; 2. Use the length attribute to obtain the number of all child elements in the element collection. , the syntax is "parent element object.children().length".
The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.
How to query the number of child elements in jquery
In jquery, you can use the children() method and the length attribute to query the number of child elements number.
The children() function obtains and returns a set containing all child elements
The length attribute obtains the number of all child elements in the element set
Implementation code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="js/jquery-1.10.2.min.js"></script>
<script>
$(document).ready(function() {
$("button").click(function() {
var res = $("div").children().length;
alert("子元素个数为："+res);
});
});
</script>
</head>
<body>
<div>
<p>子元素1</p>
<p>子元素2</p>
<p>子元素3</p>
</div><br>
<button>div元素中有几个子元素</button>
</body>
</html>
[Recommended learning: jQuery video tutorial, web front-end 】
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