How to check if an element has a certain class name with jQuery
jQuery comes with two methods to check if an element has a certain class name. Both methods have the same functionality.
- is(‘.classname’)
- hasClass(‘.classname’)
For example, to check if div element has a class name of ‘redColor’.
1. is(‘.classname’)
$('div').is('.redColor')
2. hasClass(‘.classname’)
$('div').hasClass('.redColor')
Example
If the div element has a class name of ‘redColor’, then change its class to ‘blueColor’.
<html>
<head>
<style type="text/css">
.redColor {
background:red;
}
.blueColor {
background:blue;
}
</style>
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
</head>
<body>
<h1>jQuery check if an element has a certain class</h1>
<div class="redColor">This is a div tag with class name of "redColor"</div>
<p>
<button id="isTest">is('.redColor')</button>
<button id="hasClassTest">hasClass('.redColor')</button>
<button id="reset">reset</button>
</p>
<script type="text/javascript">
$("#isTest").click(function () {
if($('div').is('.redColor')){
$('div').addClass('blueColor');
}
});
$("#hasClassTest").click(function () {
if($('div').hasClass('.redColor')){
$('div').addClass('blueColor');
}
});
$("#reset").click(function () {
location.reload();
});
</script>
</body>
</html>
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classname should be without dot for hasClass function.
$('div').hasClass('redColor')great! yousaved my night!