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Edify Technologies

Draggable - Cannot read property 'parentNode' of null

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I've been updating a working slider to GSAP 3 ? and am getting this breaking error: Cannot read property 'parentNode' of null. I've created a very simplified codepen where you'll see a working draggable box (for posterity) and one that uses a proxy, which causes the error.


Could there be a bug in Draggable.js?


The culprit is the updateMatrix() function at matrix = getGlobalMatrix(target.parentNode, true);. My proxy doesn't have a parentNode, so we're passing null here to getGlobalMatrix.


If we hop over to matrix.js the getGlobalMatrix(element, inverse) function starts with if (!element.parentNode) { ... }. We're already passing the parentNode as element (which is null in my case), so it seems weird to me to check for a second (grand)parentNode.


If it's helpful, the original slider was based on @OSUblake's Draggable Auto Slider which uses a proxy div as a target for the draggable.


See the Pen veyxyQ by osublake (@osublake) on CodePen





See the Pen JjooNrd by sallf (@sallf) on CodePen

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Def looks like an issue that @GreenSock will need to check out. 

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First of all, thanks so much for creating the reduced test case that makes things so clear, @Edify Technologies! I wish every user was as thoughtful as you. 


I have added some code to work around that edge case in the upcoming release which you can preview at https://s3-us-west-2.amazonaws.com/s.cdpn.io/16327/Draggable3.min.js (just clear your cache and refresh your demo page and it should work). Better? 

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Thanks @GreenSock, it's working with the updated draggable file. Every once in a while, a blind nut finds a squirrel...or something like that ?.

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