Gabriel F. answered • 10/28/19
Tutor
5.0
(85)
Full Stack Software Developer and Mentor
This replaces all classes in element(s) with "changer" class with the "changed" class:
document.querySelector('.changer').className = "changed";
A little demo you can try out yourself:
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.changer, .changed {
width: 200px;
height: 200px;
color: white;
}
.changer {
background: blue;
}
.changed {
background: red;
}
</style>
</head>
<body>
<div class="changer"></div>
<script>
var changer = document.querySelector('.changer')
changer.addEventListener('click', e => {
changer.className = "changed";
// element background should change to red
});
</script>
</body>
</html>
