how to change css variable in js code example
Example 1: how to change a css variable with javascript
var root = document.querySelector(':root');
root.style.setProperty('--variable', 'lightblue');
/or/
root.style.setProperty('--variable', myColor);
Example 2: javascript get css variable
let docStyle = getComputedStyle(document.documentElement);
let myVarVal docStyle.getPropertyValue('--my-variable-name');
docStyle.setProperty('--my-variable-name', '#fff');
Example 3: set css variable from javascript
document.documentElement.style.cssText = "--tab-count: 3";
/or/
document.documentElement.style.setProperty("--tab-count", 5);
/or/
document.documentElement.setAttribute("style", "--tab-count: 5");
Example 4: change css variable with javascript
let root = document.documentElement;
root.addEventListener("mousemove", e => {
root.style.setProperty('--mouse-x', e.clientX + "px");
root.style.setProperty('--mouse-y', e.clientY + "px");
});