jQuery .has() method checks existence for a selector
Syntax and Description
The .has() method constructs a new jQuery object from a subset of the matching elements.
.has(selector)
selector is a string containing a
selector expression to match elements against.
Return value is the new jQuery object.
Consider a page with a nested list as follows:
<ul>/* w w w . jav a 2 s. c om*/
<li>1</li>
<li>2
<ul>
<li>list item 2-a</li>
<li>list item 2-b</li>
</ul>
</li>
<li>3</li>
<li>4</li>
</ul>
The following code
$('li').has('ul').css('background-color', 'red');
marks item 2 to red.