mirror of
https://github.com/Hopiu/jquery-mobile.git
synced 2026-03-18 06:50:23 +00:00
77 lines
No EOL
3.1 KiB
HTML
77 lines
No EOL
3.1 KiB
HTML
<!DOCTYPE html>
|
|
<html lang='en'><head>
|
|
<meta charset="utf-8">
|
|
<meta name="viewport" content="width=device-width, minimum-scale=1, maximum-scale=1"><meta http-equiv='content-type' content='text/html; charset=UTF-8' /></head><body>
|
|
<div data-role="page">
|
|
<div data-role="header">
|
|
<h1>.has()</h1>
|
|
|
|
</div>
|
|
<div data-role="content" data-theme="c" id="has1">
|
|
<h2 class="jq-clearfix roundTop section-title">
|
|
<span class="name">.has( selector )</span> <span class="returns">Returns: <a class="return" href="http://docs.jquery.com/Types#jQuery">jQuery</a></span>
|
|
</h2>
|
|
<div class=" entry-details">
|
|
<p class="desc"><strong>Description: </strong>Reduce the set of matched elements to those that have a descendant that matches the selector or DOM element.</p>
|
|
<ul class="signatures">
|
|
<li class="signature" id="has-selector">
|
|
<h4 class="name">
|
|
<span class="versionAdded">version added: <a href="/category/version/1.4/">1.4</a></span>.has( selector )</h4>
|
|
<p class="arguement"><strong>selector</strong>A string containing a selector expression to match elements against.</p>
|
|
</li>
|
|
<li class="signature" id="has-contained">
|
|
<h4 class="name">
|
|
<span class="versionAdded">version added: <a href="/category/version/1.4/">1.4</a></span>.has( contained )</h4>
|
|
<p class="arguement"><strong>contained</strong>A DOM element to match elements against.</p>
|
|
</li>
|
|
</ul>
|
|
<div class="longdesc">
|
|
<p>Given a jQuery object that represents a set of DOM elements, the <code>.has()</code> 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.</p>
|
|
<p>Consider a page with a nested list as follows:</p>
|
|
<pre>
|
|
<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>
|
|
</pre>
|
|
<p>We can apply this method to the set of list items as follows:</p>
|
|
<pre>$('li').has('ul').css('background-color', 'red');</pre>
|
|
<p>The result of this call is a red background for item 2, as it is the only <code><li></code> that has a <code><ul></code> among its descendants.</p>
|
|
</div>
|
|
<h3>Example:</h3>
|
|
<div id="entry-examples" class="entry-examples"><div id="example-0">
|
|
<h4><span class="desc">Check if an element is inside another.</span></h4>
|
|
<pre><code class="example demo-code"><!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<style>
|
|
.full { border: 1px solid red; }
|
|
</style>
|
|
<script src="http://code.jquery.com/jquery-latest.js"></script>
|
|
</head>
|
|
<body>
|
|
|
|
<ul><li>Does the UL contain an LI?</li></ul>
|
|
|
|
<script>
|
|
$("ul").append("<li>" + ($("ul").has("li").length ? "Yes" : "No") + "</li>");
|
|
$("ul").has("li").addClass("full");
|
|
</script>
|
|
</body>
|
|
</html></code></pre>
|
|
<h4>Demo:</h4>
|
|
<div class="demo code-demo"></div>
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
|
|
</div>
|
|
|
|
</body></html> |