Description: Reduce the set of matched elements to those that have a descendant that matches the selector or DOM element.
.has( selector )
version added: 1.4
selector
A string containing a selector expression to match elements against.
.has( contained )
version added: 1.4
contained
A DOM element to match elements against.
Given a jQuery object that represents a set of DOM elements, the .has() method constructs a new jQuery object from a subset of the matching elements. The supplied selector is tested against the descendants of the matching elements; the element will be included in the result if any of its descendant elements matches the selector.
Consider a page with a simple list on it:
<ul>
<li>list item 1</li>
<li>list item 2
<ul>
<li>list item 2-a</li>
<li>list item 2-b</li>
</ul>
</li>
<li>list item 3</li>
<li>list item 4</li>
</ul>
We can apply this method to the set of list items:
$('li').has('ul').css('background-color', 'red');
The result of this call is a red background for item 2, as it is the only <li> that has a <ul> among its descendants.
- list item 1
- list item 2
- list item 2-a
- list item 2-b
- list item 3
- list item 4
Example
Check if an element is inside another.Example - Full source:
Check if an element is inside another.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style>
.full { border: 1px solid red; }
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript" language="javascript">
$(document).ready(function(){
$("ul").append("<li>" + ($("ul").has("li").length ? "Yes" : "No") + "");
$("ul").has("li").addClass("full");
});
</script>
</head>
<body>
<ul><li>Does the UL contain an LI?</li></ul>
</body>
</html>
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