Question

I’m trying to set a background for a div using jQuery:

$(".cover").css("background", "yellow");

However I keep getting:

Uncaught TypeError: Cannot call method ‘css’ of null

Also tried with adding an id instead of a class:

$("cover").css("background", "yellow"); 

but then it says:

Uncaught TypeError: Object # has no method ‘css’

Source code: http://pastebin.com/FEVwL8iq

Answer 1

Edit: I can see you’re using Mootools on the page as well.

Mootools has probably assigned it self to $. Try changing the expression to this:

jQuery(".cover").css("background", "yellow");