jQuery.fn.extend()


jQuery.fn.extend( object )Returns: Object

Description: Merge the contents of an object onto the jQuery prototype to provide new jQuery instance methods.

The jQuery.fn.extend() method extends the jQuery prototype ($.fn) object to provide new methods that can be chained to the jQuery() function.

Example:

Add two methods to the jQuery prototype ($.fn) object and then use one of them.

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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery.fn.extend demo</title>
<style>
label {
display: block;
margin: .5em;
}
</style>
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<label><input type="checkbox" name="foo"> Foo</label>
<label><input type="checkbox" name="bar"> Bar</label>
<script>
jQuery.fn.extend({
check: function() {
return this.each(function() {
this.checked = true;
});
},
uncheck: function() {
return this.each(function() {
this.checked = false;
});
}
});
// Use the newly created .check() method
$( "input[type='checkbox']" ).check();
</script>
</body>
</html>

Demo: