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CSS Change Variables With JavaScript

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Change Variables With JavaScript #

CSS variables have access to the DOM, which means that you can change them with JavaScript.

Here is an example of how you can create a script to display and change the –blue variable from the example used in the previous pages. For now, do not worry if you are not familiar with JavaScript. You can learn more about JavaScript in our JavaScript Tutorial:

<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', 'lightblue'); } </script>

Browser Support #

The numbers in the table specify the first browser version that fully supports the var() function.

Function Chrome Internet explorer Mozila Firefox Safari Opera
var() 49.0 15.0 31.0 9.1 36.0

CSS var() Function #

Property Description
var() Inserts the value of a CSS variable

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