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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">.mouseover()</h1>
<div class="entry-meta jq-clearfix">
Categories:
<span class="category"><a href="http://api.jquery.com/category/events/" title="View all posts in Events">Events</a> > <a href="http://api.jquery.com/category/events/mouse-events/" title="View all posts in Mouse Events">Mouse Events</a></span>
</div>
</div>
<div id="mouseover1" class="entry method">
<h2 class="jq-clearfix roundTop section-title">
<span class="name">.mouseover( handler(eventObject) )</span> <span class="returns">Returns: <a class="return" href="http://api.jquery.com/Types/#jQuery">jQuery</a></span>
</h2>
<div class="jq-box roundBottom entry-details">
<p class="desc"><strong>Description: </strong>Bind an event handler to the "mouseover" JavaScript event, or trigger that event on an element.</p>
<ul class="signatures">
<li class="signature" id="mouseover-handlereventObject">
<h4 class="name">
<span class="versionAdded">version added: <a href="/category/version/1.0/">1.0</a></span>.mouseover( handler(eventObject) )</h4>
<p class="arguement"><strong>handler(eventObject)</strong>A function to execute each time the event is triggered.</p>
</li>
<li class="signature" id="mouseover-eventData-handlereventObject">
<h4 class="name">
<span class="versionAdded">version added: <a href="/category/version/1.4.3/">1.4.3</a></span>.mouseover( [eventData], handler(eventObject) )</h4>
<p class="arguement"><strong>eventData</strong>A map of data that will be passed to the event handler.</p>
<p class="arguement"><strong>handler(eventObject)</strong>A function to execute each time the event is triggered.</p>
</li>
<li class="signature" id="mouseover"><h4 class="name">
<span class="versionAdded">version added: <a href="/category/version/1.0/">1.0</a></span>.mouseover()</h4></li>
</ul>
<div class="longdesc">
<p>This method is a shortcut for <code>.bind('mouseover', handler)</code> in the first two variations, and <code>.trigger('mouseover')</code> in the third.</p>
<p>The <code>mouseover</code> event is sent to an element when the mouse pointer enters the element. Any HTML element can receive this event.</p>
<p>For example, consider the HTML:</p>
<pre><div id="outer">
Outer
<div id="inner">
Inner
</div>
</div>
<div id="other">
Trigger the handler
</div>
<div id="log"></div></pre>
<p class="image"><img src="/images/0042_05_06.png" alt=""></p>
<p>The event handler can be bound to any element:</p>
<pre>$('#outer').mouseover(function() {
$('#log').append('<div>Handler for .mouseover() called.</div>');
});</pre>
<p>Now when the mouse pointer moves over the <span class="output">Outer</span> <code><div></code>, the message is appended to <code><div id="log"></code>. We can also trigger the event when another element is clicked:</p>
<pre>$('#other').click(function() {
$('#outer').mouseover();
});</pre>
<p>After this code executes, clicks on <span class="output">Trigger the handler</span> will also append the message.</p>
<p>This event type can cause many headaches due to event bubbling. For instance, when the mouse pointer moves over the <span class="output">Inner</span> element in this example, a <code>mouseover</code> event will be sent to that, then trickle up to <span class="output">Outer</span>. This can trigger our bound <code>mouseover</code> handler at inopportune times. See the discussion for <code>.mouseenter()</code> for a useful alternative.</p>
</div>
<h3>Example:</h3>
<div class="entry-examples" id="entry-examples"><div id="example-0">
<h4><span class="desc">Show the number of times mouseover and mouseenter events are triggered.
mouseover fires when the pointer moves into the child element as well, while mouseenter fires only when the pointer moves into the bound element.</span></h4>
<pre class="prettyprint"><code class="example demo-code"><!DOCTYPE html>
<html>
<head>
<style>
div.out { width:40%; height:120px; margin:0 15px;
background-color:#D6EDFC; float:left; }
div.in { width:60%; height:60%;
background-color:#FFCC00; margin:10px auto; }
p { line-height:1em; margin:0; padding:0; }
</style>
<script src="http://code.jquery.com/jquery-1.7rc2.js"></script>
</head>
<body>
<div class="out overout">
<span>move your mouse</span>
<div class="in">
</div>
</div>
<div class="out enterleave">
<span>move your mouse</span>
<div class="in">
</div>
</div>
<script>
var i = 0;
$("div.overout").mouseover(function() {
i += 1;
$(this).find("span").text( "mouse over x " + i );
}).mouseout(function(){
$(this).find("span").text("mouse out ");
});
var n = 0;
$("div.enterleave").mouseenter(function() {
n += 1;
$(this).find("span").text( "mouse enter x " + n );
}).mouseleave(function() {
$(this).find("span").text("mouse leave");
});
</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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