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grimey test
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Warning: Please note

This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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Is it possible to animate the opacity of a DIV's background-image property?


I have a client who wants a slideshow on his index page with the header on top of the images with a little transparency. The images will swap out beneath the header. Horrible idea, I know, but it's a paycheck.



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Hello grimey and Welcome to  the GreenSock Forums!


This is definitely possible with GSAP, and very easy:


Working example animating opacity:

See the Pen KqLIe by jonathan (@jonathan) on CodePen



// cache element in variable
var $img = $('#box');
// set initial CSS opacity to 0
// GSAP handles the cross browser vendor prefixes
// animate CSS opacity to 1
TweenMax.to($img,3, {opacity:1});


<div id="box"></div>


#box {
     background-repeat: no-repeat;
     background-position: 0 0;
     background-color: transparent;
     width: 538px;
     height: 196px;

Also you could use autoAlpha instead of opacity in GSAP for a better fade in and fade out.


Same example but with autoAlpha:

See the Pen iHdek by jonathan (@jonathan) on CodePen


Taken from CSSPlugin Docs:


autoAlpha - the same thing as "opacity" except that when the value hits "0", the "visibility" property will be set to "hidden" in order to improve browser rendering performance and prevent clicks/interactivity on the target. When the value is anything other than 0, "visibility" will be set to "inherit". We don't set it to "visible" in order to honor inheritance (imagine the parent element is hidden - setting the child to visible explicitly would cause it to appear when that's probably not what was intended). And for convenience, if the element's visibility is initially set to "hidden" and opacity is 1, it will assume opacity should also start at 0. This makes it simple to start things out on your page as invisible (set your css visibility:hidden) and then fade them in whenever you want.


You can learn more about GSAP in the Docs:


Documentation: TweenMaxTweenLiteTimelineMaxTimelineLitePlugins


Does that help? :)

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Whoa. Thank you! This is a lifesaver!




P.S. I've actually used GSAP with AS3 for years, but am starting to need it for web work now. Whoever thought JS was a suitable replacement for AS3 was in err, IMO. :)

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In order to add to Jonathan's advice another choice could be use the :after pseudo-element and the CSS Rule plugin. I remembered a codepen Jamie did some time using the plugin so I'm just leeching his brain, so-to speak :D


I've set up a codepen:


See the Pen cEBbg by rhernando (@rhernando) on CodePen


Although you don't have full browser support, IE8 doesn't support the negative z-index hack that puts the pseudo element behind the actual element.



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  • 6 months later...

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