Style And Class

With JavaScript you can access and update an element’s style and even its class. Say that you have two CSS classes:

.warning {color: yellow;}
.error {color: green;}

You can update or switch an element’s CSS class with the following JavaScript code:

var element = document.getElementById('element');
element.className = 'warning';

But you can access individual CSS attributes via an element’s style object, such as

var element = document.getElementById('element');  = 'green';

Of course, you might update an element’s style based on some event or in conjunction of an Ajax call.

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