t4d_ t4d_ - 5 months ago 27
CSS Question

Change CSS variable using jQuery

Is it possible to change a variable used in CSS using jQuery?
Simple example:



html {
--defaultColor: teal;
}
.box {
background: var(--defaultColor);
width: 100px;
height: 100px;
margin: 5px;
float: left;
}
.circle {
background: #eee;
border: 2px solid var(--defaultColor);
width: 100px;
height: 100px;
margin: 5px;
float: left;
border-radius: 100%;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="clickToChange" type="button" style="width: 100%;">Click to Change</button>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<br/>
<div class="circle"></div>
<div class="circle"></div>
<div class="circle"></div>





How can I change the variable color from teal to red for example? This one doesn't work.

$("#clickToChange").click(function(){
$(html).css("--defaultColor", "red");
});

Answer

You may change the css variable using plain JavaScript elem.style.setProperty("variableName", "variableProp");

$("html").on('click', function() {
  
  $("body").get(0).style.setProperty("--color", "hotpink");
  
});
body {
  --color: blue;
  background-color: var(--color);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

click me!