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<!DOCTYPE html>
<html lang='en'><head><meta http-equiv='content-type' content='text/html; charset=UTF-8' /></head><body>
<div class="entry-content">
<div class="entry-title roundTop">
<h1 class="jq-clearfix">:hidden Selector</h1>
<div class="entry-meta jq-clearfix">
Categories:
<span class="category"><a href="http://api.jquery.com/category/selectors/" title="View all posts in Selectors">Selectors</a> > <a href="http://api.jquery.com/category/selectors/jquery-selector-extensions/" title="View all posts in jQuery Extensions">jQuery Extensions</a></span> | <span class="category"><a href="http://api.jquery.com/category/selectors/" title="View all posts in Selectors">Selectors</a> > <a href="http://api.jquery.com/category/selectors/visibility-filter-selectors/" title="View all posts in Visibility Filter">Visibility Filter</a></span>
</div>
</div>
<div id="hidden1" class="entry selector">
<h2 class="jq-clearfix roundTop section-title">
<span class="name">hidden</span> selector</h2>
<div class="jq-box roundBottom entry-details">
<h4 class="name">
<span class="versionAdded">version added: <a href="/category/version/1.0/">1.0</a></span>jQuery(':hidden')</h4>
<p class="desc"><strong>Description: </strong>Selects all elements that are hidden.</p>
<div class="longdesc">
<p>Elements can be considered hidden for several reasons:</p>
<ul>
<li>They have a CSS <code>display</code> value of <code>none</code>.</li>
<li>They are form elements with <code>type="hidden"</code>.</li>
<li>Their width and height are explicitly set to 0.</li>
<li>An ancestor element is hidden, so the element is not shown on the page.</li>
</ul>
<p>Elements with <code>visibility: hidden</code> or <code>opacity: 0</code> are considered to be visible, since they still consume space in the layout. During animations that hide an element, the element is considered to be visible until the end of the animation. During animations to show an element, the element is considered to be visible at the start of the animation.</p>
<p>How <code>:hidden</code> is determined was changed in jQuery 1.3.2. An element is assumed to be hidden if it or any of its parents consumes no space in the document. CSS visibility isn't taken into account (therefore <code>$(elem).css('visibility','hidden').is(':hidden') == false</code>). The <a href="http://docs.jquery.com/Release:jQuery_1.3.2#:visible.2F:hidden_Overhauled">release notes</a> outline the changes in more detail.</p>
</div>
<h3 id="notes-0">Additional Notes:</h3>
<div class="longdesc"><ul><li>Because <code>:hidden</code> is a jQuery extension and not part of the CSS specification, queries using <code>:hidden</code> cannot take advantage of the performance boost provided by the native DOM <code>querySelectorAll()</code> method. To achieve the best performance when using <code>:hidden</code> to select elements, first select the elements using a pure CSS selector, then use <a href="http://api.jquery.com/filter/"><code>.filter(":hidden")</code></a>.</li></ul></div>
<h3>Example:</h3>
<div class="entry-examples" id="entry-examples"><div id="example-0">
<h4><span class="desc">Shows all hidden divs and counts hidden inputs.</span></h4>
<pre class="prettyprint"><code class="example demo-code"><!DOCTYPE html>
<html>
<head>
<style>
div { width:70px; height:40px; background:#ee77ff; margin:5px; float:left; }
span { display:block; clear:left; color:red; }
.starthidden { display:none; }
</style>
<script src="http://code.jquery.com/jquery-1.7rc2.js"></script>
</head>
<body>
<span></span>
<div></div>
<div style="display:none;">Hider!</div>
<div></div>
<div class="starthidden">Hider!</div>
<div></div>
<form>
<input type="hidden" />
<input type="hidden" />
<input type="hidden" />
</form>
<span>
</span>
<script>
// in some browsers :hidden includes head, title, script, etc...
var hiddenEls = $("body").find(":hidden").not("script");
$("span:first").text("Found " + hiddenEls.length + " hidden elements total.");
$("div:hidden").show(3000);
$("span:last").text("Found " + $("input:hidden").length + " hidden inputs.");
</script>
</body>
</html></code></pre>
<h4>Demo:</h4>
<div class="demo code-demo"></div>
</div></div>
</div>
</div>
</div>
</body></html>
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