Set an event for a div with multiple class

I am tryi开发者_运维百科ng to set an event on a div whos parent has a class="classA classB"; My css is being applied but i cant figure out how to specify it with jquery. How do i set an event with jquery for this class combination

$('[class=classA classB]').live('click', function () {
        alert('a');
    });

html

<div class="classA classB">...moredivs...</div>

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Chain the classes in the selector, like this:

$('.classA.classB').live('click', function () {
    alert('a');
});

Without a space in-between, the selector will only match element that have all the classes.
Note: the class order doesn't have to match!