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Home >Web Front-end >JS Tutorial >How to change an element's class using JavaScript?
The className attribute is used to change the class of an element. Here we will see two examples -
In this example, we will use the className attribute to change the class of the element. Let's say we have a div with class oldStyle -
<div id="mydiv" class="oldStyle"> <p>The div...</p> </div>
We will use the className attribute to set the above oldStyle class to a new class, i.e. newStyle -
function demoFunction() {
document.getElementById("mydiv").className = "newStyle";
}
We achieved the above goal by calling demoFunction() by clicking the following button -
<p>Click the below button to change the class</p> <button onclick="demoFunction()">Change Class</button>
Let’s see the complete example -
<!DOCTYPE html>
<html>
<style>
.oldStyle {
background-color: yellow;
padding: 5px;
border: 2px solid orange;
font-size: 15px;
}
.newStyle {
background-color: green;
text-align: center;
font-size: 25px;
padding: 7px;
}
</style>
<body>
<h1>Changing the class</h1>
<p>Click the below button to change the class</p>
<button onclick="demoFunction()">Change Class</button>
<div id="mydiv" class="oldStyle">
<p>The div...</p>
</div>
<script>
function demoFunction() {
document.getElementById("mydiv").className = "newStyle";
}
</script>
</body>
</html>
We can also create a button that works in both ways, that is, toggle. Clicking the button again switches it back -
<!DOCTYPE html>
<html>
<style>
.oldStyle {
background-color: yellow;
padding: 5px;
border: 2px solid orange;
font-size: 15px;
}
.newStyle {
background-color: green;
text-align: center;
font-size: 25px;
padding: 7px;
}
</style>
<body>
<h1>Toggle the class</h1>
<p>Click the below button to toggle the classes</p>
<button onclick="demoFunction()">Toggle Class</button>
<div id="mydiv" class="oldStyle">
<p>The div...</p>
</div>
<script>
function demoFunction() {
const element = document.getElementById("mydiv");
if (element.className == "oldStyle") {
element.className = "newStyle";
} else {
element.className = "oldStyle";
}
}
</script>
</body>
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