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118 lines
No EOL
5.2 KiB
HTML
118 lines
No EOL
5.2 KiB
HTML
<!DOCTYPE html>
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<html lang='en'><head>
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<meta charset="utf-8">
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<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>
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<div data-role="page">
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<div data-role="header">
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<h1>.before()</h1>
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</div>
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<div data-role="content" data-theme="c" id="before1">
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<h2 class="jq-clearfix roundTop section-title">
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<span class="name">.before( content )</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>Insert content, specified by the parameter, before each element in the set of matched elements.</p>
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<ul class="signatures">
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<li class="signature" id="before-content">
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<h4 class="name">
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<span class="versionAdded">version added: <a href="/category/version/1.0/">1.0</a></span>.before( content )</h4>
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<p class="arguement"><strong>content</strong>An element, HTML string, or jQuery object to insert before each element in the set of matched elements.</p>
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</li>
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<li class="signature" id="before-function">
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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>.before( function )</h4>
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<p class="arguement"><strong>function</strong>A function that returns an HTML string to insert before each element in the set of matched elements.</p>
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</li>
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</ul>
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<div class="longdesc">
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<p>The <code>.before()</code> and <code><a href="/insertBefore">.insertBefore()</a></code> methods perform the same task. The major difference is in the syntax-specifically, in the placement of the content and target. With<code> .before()</code>, the selector expression preceding the method is the container before which the content is inserted. With <code>.insertBefore()</code>, on the other hand, the content precedes the method, either as a selector expression or as markup created on the fly, and it is inserted before the target container.</p>
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<p>Consider the following HTML:</p>
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<pre><div class="container">
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<h2>Greetings</h2>
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<div class="inner">Hello</div>
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<div class="inner">Goodbye</div>
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</div></pre>
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<p>We can create content and insert it before several elements at once:</p>
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<pre>$('.inner').before('<p>Test</p>');</pre>
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<p>Each inner <code><div></code> element gets this new content:</p>
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<pre><div class="container">
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<h2>Greetings</h2>
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<p>Test</p>
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<div class="inner">Hello</div>
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<p>Test</p>
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<div class="inner">Goodbye</div>
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</div></pre>
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<p>We can also select an element on the page and insert it before another:</p>
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<pre>$('.container').before($('h2'));</pre>
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<p>If an element selected this way is inserted elsewhere, it will be moved before the target (not cloned):</p>
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<pre><h2>Greetings</h2>
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<div class="container">
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<div class="inner">Hello</div>
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<div class="inner">Goodbye</div>
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</div></pre>
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<p>If there is more than one target element, however, cloned copies of the inserted element will be created for each target after the first.</p>
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<p>In jQuery 1.4, <code>.before()</code> and <code>.after()</code> will also work on disconnected DOM nodes:</p>
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<pre>$("<div/>").before("<p></p>");</pre>
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<p>The result is a jQuery set that contains a paragraph and a div (in that order).</p>
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</div>
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<h3>Examples:</h3>
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<div id="entry-examples" class="entry-examples">
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<div id="example-0">
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<h4>Example: <span class="desc">Inserts some HTML before all paragraphs.</span>
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</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>p { background:yellow; }</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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<p> is what I said...</p>
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<script>$("p").before("<b>Hello</b>");</script>
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</body>
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</html></code></pre>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div>
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<div id="example-1">
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<h4>Example: <span class="desc">Inserts a DOM element before all paragraphs.</span>
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</h4>
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<pre><code class="example demo-code"><!DOCTYPE html>
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<html>
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<head>
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<style>p { background:yellow; }</style>
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<script src="http://code.jquery.com/jquery-latest.js"></script>
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</head>
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<body>
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<p> is what I said...</p>
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<script>$("p").before( document.createTextNode("Hello") );</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>
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<div id="example-2">
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<h4>Example: <span class="desc">Inserts a jQuery object (similar to an Array of DOM Elements) before all paragraphs.</span>
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</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>p { background:yellow; }</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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<p> is what I said...</p><b>Hello</b>
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<script>$("p").before( $("b") );</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>
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</div>
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</div>
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</div>
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</div>
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</body></html> |