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Was really pleased when I came across this, as I'm having to define Easing as strings a lot of the time, although for some reason it isn't working for me. I always get -

ReferenceError: EaseLookup is not defined


- whenever I try to put it into action.


I tried to get it to work in one of the example files (carousel.html), just in case my own files were missing something or had something in them that was interfering but no dice.


TweenLite.fromTo(boxes[i], 1, {css:{marginTop:-500}}, {css:positions[boxes[i].attr("data-pos")], delay:i * 0.1 + 0.25, ease:EaseLookup.find("Elastic.easeOut")});


Same error as above, and EasePack.min. js is loaded in the header etc.

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Sorry about any confusion there, but EaseLookup isn't available in the JS flavor yet - that's just for the ActionScript/Flash version. However, you should still be able to get the eases you want because they're all stored in the com.greensock.easing object, so Elastic.easeOut would be at com.greensock.easing.Elastic.easeOut. Therefore, you can simply parse your string and do the lookup yourself. See what I mean? Maybe something like this (rough/untested):


var str = "Elastic.easeOut";
var ease = com.greensock.easing[ str.split(".")[0] ][ str.split(".")[1] ];

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  • 4 months later...
  • 1 month later...

Check out this thread:



It's now integrated into GSAP. :) Just download the latest version. http://www.greensock.com/gsap-js/ (or if you're a Club GreenSock member, get it with all your bonus stuff at https://www.greensock.com/account/)

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