mjon_git/src/main/webapp/WEB-INF/jsp/cnt/CNTDT_0000000343.jsp
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<div class="post-heirarchy">Posted in: <a href="http://learn.jquery.com/using-jquery-core/">Using jQuery Core</a></div>
<article class="post-123 page type-page status-publish hentry" id="post-123">
<header class="entry-header">
<h1 class="entry-title">$( document ).ready()</h1>
</header>
<div class="entry-content">
<p>A page can&#39;t be manipulated safely until the document is &quot;ready.&quot; jQuery detects this state of readiness for you. Code included inside <code>$( document ).ready()</code> will only run once the page Document Object Model (DOM) is ready for JavaScript code to execute. Code included inside <code>$( window ).on( &quot;load&quot;, function() { ... })</code> will run once the entire page (images or iframes), not just the DOM, is ready.</p>
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<div class="line"><code><span class="comment">// A $( document ).ready() block.</span></code></div>
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<div class="container">
<div class="line"><code>$( document ).ready(<span class="keyword">function</span>() {</code></div>
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<div class="container">
<div class="line"><code>console.log( <span class="string">&quot;ready!&quot;</span> );</code></div>
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<div class="container">
<div class="line"><code>});</code></div>
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<p>Experienced developers sometimes use the shorthand <code>$()</code> for <code>$( document ).ready()</code>. If you are writing code that people who aren&#39;t experienced with jQuery may see, it&#39;s best to use the long form.</p>
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<div class="line"><code><span class="comment">// Shorthand for $( document ).ready()</span></code></div>
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<div class="line"><code>$(<span class="keyword">function</span>() {</code></div>
</div>
<div class="container">
<div class="line"><code>console.log( <span class="string">&quot;ready!&quot;</span> );</code></div>
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<div class="line"><code>});</code></div>
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<p>You can also pass a named function to <code>$( document ).ready()</code> instead of passing an anonymous function.</p>
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<div class="line"><code><span class="comment">// Passing a named function instead of an anonymous function.</span></code></div>
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<div class="line"><code><span class="function"><span class="keyword">function</span> <span class="title">readyFn</span><span class="params">( jQuery )</span> {</span></code></div>
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<div class="line"><code><span class="comment">// Code to run when the document is ready.</span></code></div>
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<div class="line"><code>}</code></div>
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<div class="line">&nbsp;</div>
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<div class="container">
<div class="line"><code>$( document ).ready( readyFn );</code></div>
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<div class="container">
<div class="line"><code><span class="comment">// or:</span></code></div>
</div>
<div class="container">
<div class="line"><code>$( window ).on( <span class="string">&quot;load&quot;</span>, readyFn );</code></div>
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<p>The example below shows <code>$( document ).ready()</code> and <code>$( window ).on( &quot;load&quot; )</code> in action. The code tries to load a website URL in an <code>&lt;iframe&gt;</code> and checks for both events:</p>
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<pre>
&nbsp;</pre>
<div class="container">
<div class="line"><code><span class="tag">&lt;<span class="title">html</span>&gt;</span></code></div>
</div>
<div class="container">
<div class="line"><code><span class="tag">&lt;<span class="title">head</span>&gt;</span></code></div>
</div>
<div class="container">
<div class="line"><code><span class="tag">&lt;<span class="title">script</span> <span class="attribute">src</span>=<span class="value">&quot;https://code.jquery.com/jquery-1.9.1.min.js&quot;</span>&gt;</span><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div>
</div>
<div class="container">
<div class="line"><code><span class="tag">&lt;<span class="title">script</span>&gt;</span></code></div>
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<div class="container">
<div class="line"><code>$( document ).ready(<span class="keyword">function</span>() {</code></div>
</div>
<div class="container">
<div class="line"><code>console.log( <span class="string">&quot;document loaded&quot;</span> );</code></div>
</div>
<div class="container">
<div class="line"><code>});</code></div>
</div>
<div class="container">
<div class="line">&nbsp;</div>
</div>
<div class="container">
<div class="line"><code>$( window ).on( <span class="string">&quot;load&quot;</span>, <span class="keyword">function</span>() {</code></div>
</div>
<div class="container">
<div class="line"><code>console.log( <span class="string">&quot;window loaded&quot;</span> );</code></div>
</div>
<div class="container">
<div class="line"><code>});</code></div>
</div>
<div class="container">
<div class="line"><code><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div>
</div>
<div class="container">
<div class="line"><code><span class="tag">&lt;/<span class="title">head</span>&gt;</span></code></div>
</div>
<div class="container">
<div class="line"><code><span class="tag">&lt;<span class="title">body</span>&gt;</span></code></div>
</div>
<div class="container">
<div class="line"><code><span class="tag">&lt;<span class="title">iframe</span> <span class="attribute">src</span>=<span class="value">&quot;http://techcrunch.com&quot;</span>&gt;</span><span class="tag">&lt;/<span class="title">iframe</span>&gt;</span></code></div>
</div>
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<div class="line"><code><span class="tag">&lt;/<span class="title">body</span>&gt;</span></code></div>
</div>
<div class="container">
<div class="line"><code><span class="tag">&lt;/<span class="title">html</span>&gt;</span></code></div>
</div>
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<div class="prev six columns"><a href="http://learn.jquery.com/using-jquery-core/dollar-object-vs-function/">$ vs $() </a></div>
<div class="next six columns"><a href="http://learn.jquery.com/using-jquery-core/avoid-conflicts-other-libraries/">Avoiding Conflicts with Other Libraries </a></div>
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<h3>Last Updated</h3>
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<li class="icon-calendar icon-large" title="Last Updated"><span>January 16, 2017</span></li>
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<h3>Suggestions, Problems, Feedback?</h3>
<a class="button dark" href="https://github.com/jquery/learn.jquery.com/tree/master/page/using-jquery-core/document-ready.md">Open an Issue or Submit a Pull Request on GitHub</a></aside>
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