Question

I have a div in a page that I can’t select with jQuery. I’ve tried selecting by ID and by class, with

alert(jQuery(".warningmessage").size());

and

alert($("#" + warningId).size());

but both return 0. The only thing I can think of that might have an effect is that the content containing the element was loaded with Ajax, or maybe there’s a syntax error on the page, although I can inspect it with Firebug and see the element there.

The page is part of an app so you have to log in to see it but I can post a demo login username/password if necessary.

The HTML is

<div class="warningmessage" id="rdvg2pgrktrbdw8um_warning"></div>

Answer 1

You have not provided enough details to receive a precise answer.

I would guess that your script is running before the page loads.
Move the <script> block to the bottom of the page.
Alternatively, wrap the code in $(function() { ... }).