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Asked: 2026-05-12T23:31:07+00:00

I am building a website with some animated rollovers, where I animate the background

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I am building a website with some animated rollovers, where I animate the background image to give a colour fade effect. It works fine in FF3, Safari, chrome, but IE8 throws the "undefined is null or not an object" error.

Full text:

Message: 'undefined' is null or not an object
Line: 22
Char: 16
Code: 0
URI: http://www.philipdukes.co.uk/jquery.bgpos.js


Message: 'undefined' is null or not an object
Line: 22
Char: 16
Code: 0
URI: http://www.philipdukes.co.uk/jquery.bgpos.js

In my web page header I load jquery 1.3.2, then this bgpos library, found at the link in the error, then my homepage script.

Anytime I rollover the nav buttons, IE8 throws this error…

Any help would be appreciated: I know my code may not be the most stylish out there, so constructive criticism on that would also be welcome. I’d like to focus on this error though.

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1 Answer

  1. Editorial Team

    Stepping through things, it almost seems like it’s blowing up because

    $(item).css({backgroundPosition: '0 -246px'});

    doesn’t exist in the else clause of your homepage script.

    Edit: Just noticed that Jitter added above that “Maybe IE8 returns undefined for background-position when no explicit value is set.” Try setting the backgroundPosition in the else and see what happens.

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