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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">jQuery.isFunction()</h1>
<div class="entry-meta jq-clearfix">
Categories:
<span class="category"><a href="http://api.jquery.com/category/utilities/" title="View all posts in Utilities">Utilities</a></span>
</div>
</div>
<div id="jQuery-isFunction1" class="entry method">
<h2 class="jq-clearfix roundTop section-title">
<span class="name">jQuery.isFunction( obj )</span> <span class="returns">Returns: <a class="return" href="http://api.jquery.com/Types/#boolean">boolean</a></span>
</h2>
<div class="jq-box roundBottom entry-details">
<p class="desc"><strong>Description: </strong>Determine if the argument passed is a Javascript function object. </p>
<ul class="signatures"><li class="signature" id="jQuery-isFunction-obj">
<h4 class="name">
<span class="versionAdded">version added: <a href="/category/version/1.2/">1.2</a></span>jQuery.isFunction( obj )</h4>
<p class="arguement"><strong>obj</strong>Object to test whether or not it is a function.</p>
</li></ul>
<div class="longdesc"><p><strong>Note:</strong> As of jQuery 1.3, functions provided by the browser like <code>alert()</code> and DOM element methods like <code>getAttribute()</code> are not guaranteed to be detected as functions in browsers such as Internet Explorer.</p></div>
<h3>Examples:</h3>
<div class="entry-examples" id="entry-examples">
<div id="example-0">
<h4>Example: <span class="desc">Test a few parameter examples.</span>
</h4>
<pre class="prettyprint"><code class="example demo-code"><!DOCTYPE html>
<html>
<head>
<style>
div { color:blue; margin:2px; font-size:14px; }
span { color:red; }
</style>
<script src="http://code.jquery.com/jquery-1.7rc2.js"></script>
</head>
<body>
<div>jQuery.isFunction(objs[0]) = <span></span></div>
<div>jQuery.isFunction(objs[1]) = <span></span></div>
<div>jQuery.isFunction(objs[2]) = <span></span></div>
<div>jQuery.isFunction(objs[3]) = <span></span></div>
<div>jQuery.isFunction(objs[4]) = <span></span></div>
<script>
function stub() {
}
var objs = [
function () {},
{ x:15, y:20 },
null,
stub,
"function"
];
jQuery.each(objs, function (i) {
var isFunc = jQuery.isFunction(objs[i]);
$("span").eq(i).text(isFunc);
});
</script>
</body>
</html></code></pre>
<h4>Demo:</h4>
<div class="demo code-demo"></div>
</div>
<div id="example-1">
<h4>Example: <span class="desc">Finds out if the parameter is a function.</span>
</h4>
<pre class="prettyprint"><code class="example">$.isFunction(function(){});</code></pre>
<h4>Result:</h4>
<pre><code class="results">true</code></pre>
</div>
</div>
</div>
</div>
</div>
</body></html>
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