jQuery animate() regression since v1.5

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jQuery animate() function does not support some CSS properties since v1.5

Example with "backgroundPosition" property : $('#container').animate({backgroundPosition: '160px 50%'}, 1000);

Working with 1.4.4 (and older) ​http://jsfiddle.net/8CzvY/

Not working with 1.5 ​http://jsfiddle.net/8CzvY/1/

Is it a bug or is it not supported anymore ?

Thank you

Jon

[anonymous]

According to the documentation :

"All animated properties should be animated to a single numeric value, except as noted below; most properties that are non-numeric cannot be animated using basic jQuery functionality. (For example, width, height, or left can be animated but background-color cannot be.)"

Maybe it is new since 1.5 ?

Jon

[jitter]

Thanks for taking the time to contribute to the jQuery project by writing a bug report and providing a test case!

You already resolved this ticket all by yourself with the comment. The part of the documentation you quoted applies directly to this ticket. As backgroundPosition isn't a property with a single numeric value.

So this is basically a dupe of #7755 . You might want to look at ​my response there for a possible solution.

The reason I keep this ticket open is that this looks like a strange regression from 1.4.4 to 1.5, as there weren't that many changes to the css/animate related code afaik. So we should check what caused this to make sure we didn't break something else which IS supported.

[jitter]

#8189 is a duplicate of this ticket.

[jitter]

This got introduced by the fix for #7736 which made the "single numeric value" check for animation more strict (hint: rfxnum).

So the cause for your problems is the above mentioned fix which makes animate actually behave as the documentation describes more strictly.

This change also affects e.g. the bgpos-hook of the ​jQuery-cssHooks plugin.

[jitter]

#8190 is a duplicate of this ticket.

[snover]

Thanks for the report, but this is not a jQuery bug. The fact that this ever worked was coincidental; animating multi-value properties like background-position was never supported by default.

[jitter]

Duplicate of #7755.

[zachstronaut]

Support for animating background-position has been a part of jQuery animate (whether intentional or not) for at least all of 1.2.x, all of 1.3.x, and all of 1.4.x. I find it very unacceptable that this was broken in 1.5.x, that the unit tests did not catch this, and then when it was reported as a bug the response was "this was never intentionally supported, so this is not a bug."

Please reopen this bug report, and fix this issue.

[timmywil]

#9108 is a duplicate of this ticket.

[timmywil]

#9160 is a duplicate of this ticket.

[timmywil]

#9194 is a duplicate of this ticket.

[anonymous]

Replying to zachstronaut:

Support for animating background-position has been a part of jQuery animate (whether intentional or not) for at least all of 1.2.x, all of 1.3.x, and all of 1.4.x. I find it very unacceptable that this was broken in 1.5.x, that the unit tests did not catch this, and then when it was reported as a bug the response was "this was never intentionally supported, so this is not a bug."

Please reopen this bug report, and fix this issue.

Absolutely my opinion, I have a script I use regularly which is not working with jQuery >1.5...it uses the animation of the backgroundPosition proprety for a nice hover effect...you just can't take out a "feature" (as said above, whether intentional or not) out that was "ever" there...

[timmywil]

#9350 is a duplicate of this ticket.