Posted By
Bajarangi soft ,
Posted On 07-11-2020
Complete Code For Changing Variables Onclick Of Button Using CSS.
<!DOCTYPE html>
<html>
<head>
<title>How To Change CSS Variables Onclick Of Button Using JS</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"/>
</head>
<style>
:root {
--blue: #1e90ff;
--pink: #df9fbf;
--white: #ffffff;
--green: #408000;
}
body {
background-color: var(--pink);
}
h2 {
border-bottom: 2px solid var(--green);
}
.bg_container {
color: var(--green);
background-color: var(--white);
padding: 15px;
}
button {
background-color: var(--white);
color: var(--blue);
border: 1px solid var(--blue);
padding: 5px;
}
.button1 {
--button-blue: #0000ff;
background-color: var(--white);
color: var(--button-blue);
border: 1px solid var(--button-blue);
padding: 5px;
}
</style>
<body>
<br/><br/>
<div class="container">
<br>
<div class="text-center">
<h1 id="color" style="color: white;">CSS Variables Onclick Of Button Using JS</h1>
</div>
<br>
<div class="bg_container">
<h2>Lorem Ipsum</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar
felis blandit.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar
felis blandit.</p>
<p>
<button class="button1">Category I</button>
<button class="button1">Category II</button>
<button class="button1">Category III</button>
<button>Yes</button>
<button>No</button>
</p>
<button type="button" onclick="myFunction_get()">Get CSS Variable with JavaScript</button>
<button type="button" onclick="myFunction_set()">Change CSS Variable with JavaScript</button>
</div>
</div>
</body>
</html>
<script>
// Get the root element
var r = document.querySelector(':root');
// Create a function for getting a variable value
function myFunction_get() {
// Get the styles (properties and values) for the root
var rs = getComputedStyle(r);
// Alert the value of the --blue variable
alert("The value of --blue is: " + rs.getPropertyValue('--blue'));
}
// Create a function for setting a variable value
function myFunction_set() {
// Set the value of variable --blue to another value (in this case "lightblue")
r.style.setProperty('--blue', 'red');
}
</script>