I'm trying to turn a blue button red by using an onclick, but then I also want the button to turn back to being blue after clicking again using the same onclick function.
How would I do this?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.round {
border-radius: 5px;
color: aliceblue;
}
.blue {
background-color: blue;
}
.red {
background-color: red;
}
</style>
</head>
<body>
<button id="btn" class="round blue" onclick="clickBtn()">button</button>
<script>
function clickBtn() {
let btn = document.getElementById('btn')
if(btn.classList.contains('blue')) {
btn.classList.remove('blue')
btn.classList.add('red')
} else {
btn.classList.remove('red')
btn.classList.add('blue')
}
}
</script>
</body>
</html>You can give the button a default background color, then add a click event listener to it which toggles a class that applies a different background color:
document.querySelector('button').addEventListener('click', function(){ this.classList.toggle("red") })button{
background-color:green;
}
.red{
background-color:red;
}<button>Hello World!</button>