Mutiple css classes with a javascript variable

Question

How would I set mulitple CSS classes for an HTML element, with at least one normal class and one or more Javascript variables as classes?

Here's how I tried to do it, putting it in like a normal script:

<div class="style-a <script type="text/javascript">style-b</script>">

Then I saw that someone recommend this:

<div onload="this.class=style-a;">

But I'm pretty sure that would only work for one class.

Thoughts? Thanks in advance.

I'm pretty sure this.class wouldn't work for any classes, as it's this.className. In newer browser you can use this.classList.add('style-a'). — adeneo
– adeneo, Commented Apr 24, 2015 at 14:27
Have you tried separating the class names with a space to get multiple class names? Something like this.class='style-a class2'? — Patrick548
– Patrick548, Commented Apr 24, 2015 at 14:37
Neither of the above solutions worked for me. Thanks anyway. — Alex Slack
– Alex Slack, Commented Apr 24, 2015 at 15:09

AmmarCSE · Accepted Answer · 2015-04-24 14:30:18Z

2

Use setAttribute

var element = document.getElementById('myDiv');
element.setAttribute('class','class1 class2');

See it in action

answered Apr 24, 2015 at 14:30

AmmarCSE

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Comments

collapsar · Accepted Answer · 2015-04-24 14:55:52Z

You cannot insert script elements in html attributes to insert data computed by dynamically evaluated code.

Instead you might apply the following template:

<div id="#dyn-styles-1" class="style-a">
    <!-- div contents -->
</div>

<!-- ... -->

<script>
    //
    // Beware:
    //  - Execute _after_ the complete DOM has been built ( use handlers for `load` or `DOMContentLoaded` events)
    //  - Proof of concept only: coding style not recommended for production code
    //
    var js_var_containing_class = "style-b";

    //...

    document.getElementById("dyn-styles-1").className = document.getElementById("dyn-styles-1").className + " " + js_var_containing_class;

</script>

You need not rely on IDs but may refer to existing css classes instead:

var el = document.getElementsByClassName("style-a");

for (var i=0; i< el.length; i++) {
    el[i].className = el[i].className + " " + js_var_containing_class;
}

I tried this, but for some reason the class stays "style-a". Not sure why. Thanks though.

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