How to use CSS transition to animate dropdown menu?

Question

I know that transitions don't work when changing the display mode between classes.

So I was thinking to use jQuery to change classes. I made a fiddle here: http://jsfiddle.net/v8GTz/ but it doesn't seem to work properly :(

It looks like the border is getting animated, but the height doesn't. And opacity only animates once.

What am I doing wrong here?

ok, I managed to make the fade effect work, but the height is still not animating:

http://jsfiddle.net/XYD9K/

niaccurshi · Accepted Answer · 2013-03-02 13:59:18Z

2

Specifically, you aren't removing the class of "expanded" when you stop hovering on your "ul ul". You're actually adding it again, which I guess is an unintended mistake!

answered Mar 2, 2013 at 13:59

niaccurshi

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niaccurshi Over a year ago

I've added an updated jsfiddle for you, jsfiddle.net/XYD9K/1, which shows how you can get your desired effect without needing to worry about Javascript. Note that the elements are always display:block,but we alter the max-height and opacity to get our desired effect. This isn't perfect, you may wish to add some javascript in to determine the height of the dropdown, and alter that ul's "max-height" value to match it. This will provide the most crisp slide up/down.

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