selecting the first of multiple classes

Not sure if you can do this, but I want to select the first of two classes of an element with jQuery and return it's first class only.

<div class="mo开发者_Python百科dule blue">

I want to return 'module'.

tried this:

var state = $('body').attr('class').first();

but none of that seems to work, thanks for any advice.

Try

var class = $('.module').attr('class');
var st = class.split(' ');
var firstClass = st[0];

Once you have a reference to the element, simply get it's className attribute and split it by space, and then you'll have the first class at [0] in the split array:

var className = $(element).attr('class'),
    split = className.split(/\s+/g);

alert(split[0] || 'Empty className');

How about a one liner?

var state = $('body').attr('class').replace(/\s.+$/, "");