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76 lines
No EOL
3 KiB
HTML
76 lines
No EOL
3 KiB
HTML
<!DOCTYPE html>
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<html lang='en'><head>
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<meta charset="utf-8" /><meta http-equiv='content-type' content='text/html; charset=UTF-8' /></head><body>
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<div data-role="page">
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<div data-role="header">
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<h1>.has()</h1>
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</div>
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<div data-role="content" data-theme="c" id="has1">
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<h2 class="jq-clearfix roundTop section-title">
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<span class="name">.has( selector )</span> <span class="returns">Returns: <a class="return" href="http://docs.jquery.com/Types#jQuery">jQuery</a></span>
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</h2>
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<div class=" entry-details">
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<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>
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<ul class="signatures">
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<li class="signature" id="has-selector">
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<h4 class="name">
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<span class="versionAdded">version added: <a href="/category/version/1.4/">1.4</a></span>.has( selector )</h4>
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<p class="arguement"><strong>selector</strong>A string containing a selector expression to match elements against.</p>
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</li>
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<li class="signature" id="has-contained">
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<h4 class="name">
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<span class="versionAdded">version added: <a href="/category/version/1.4/">1.4</a></span>.has( contained )</h4>
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<p class="arguement"><strong>contained</strong>A DOM element to match elements against.</p>
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</li>
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</ul>
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<div class="longdesc">
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<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>
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<p>Consider a page with a nested list as follows:</p>
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<pre>
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<ul>
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<li>list item 1</li>
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<li>list item 2
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<ul>
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<li>list item 2-a</li>
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<li>list item 2-b</li>
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</ul>
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</li>
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<li>list item 3</li>
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<li>list item 4</li>
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</ul>
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</pre>
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<p>We can apply this method to the set of list items as follows:</p>
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<pre>$('li').has('ul').css('background-color', 'red');</pre>
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<p>The result of this call is a red background for item 2, as it is the only <code><li></code> that has a <code><ul></code> among its descendants.</p>
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</div>
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<h3>Example:</h3>
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<div id="entry-examples" class="entry-examples"><div id="example-0">
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<h4><span class="desc">Check if an element is inside another.</span></h4>
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<pre><code class="example demo-code"><!DOCTYPE html>
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<html>
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<head>
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<style>
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.full { border: 1px solid red; }
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</style>
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<script src="http://code.jquery.com/jquery-latest.js"></script>
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</head>
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<body>
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<ul><li>Does the UL contain an LI?</li></ul>
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<script>
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$("ul").append("<li>" + ($("ul").has("li").length ? "Yes" : "No") + "</li>");
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$("ul").has("li").addClass("full");
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</script>
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</body>
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</html></code></pre>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div></div>
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</div>
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</div>
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</div>
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</body></html> |