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SVG Animation: changing path object in timeline

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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 Some information, especially the syntax, may be out of date for GSAP 3.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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Having googled this issue for some time I'd really appreciate some help. I'm sure this is simple when you know how!


I'm adapting the svg animation technique here 

See the Pen zLiux by GreenSock (@GreenSock) on CodePen


I want to animate a number of paths using a timeline.  I've setup a very simple 2 item demo of the issue: .  


This demo first calls the setupNext function to set the length and pathLength object (obj).


The first tween draws the first path (triangle) just fine.


onComplete in the first tween calls the setupNext function again to get and set length and pathLength values for the second path to tween.


In this second tween the length appears to set to zero (the rectangle vanishes) but the value doesn't tween to draw it again.


Looking at  a console.log() of the object it's clear I'm not setting it in the right way for the second tween. Is this a scope problem? Should I use invalidate()?


Anyone able to point me in the right direction?


Thank you.

See the Pen NPWJoV by fireball (@fireball) on CodePen

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Hi and welcome to the GreenSock forums.


Yeah, there are some bits of your code that aren't re-usable for multiple tweens.

Here is a little bit of a cleanup:


var svg1 = document.querySelector('#svg'+1);
var svg2 = document.querySelector('#svg'+2);
var tl = new TimelineLite();

//create a timeline with 2 tweens that draw 2 separate strokes

//this function creates a single tween that animates the stroke of an svg
function createLineTween(svg) { 
   var pathObject = {length:0, pathLength:svg.getTotalLength()}; 
   var tween = TweenLite.to(pathObject, 0.5, {length:pathObject.pathLength, onUpdate:drawLine, onUpdateParams:[pathObject, svg], immediateRender:true});
   return tween;

 //update stroke   
 function drawLine(obj, svg) {
  svg.style.strokeDasharray = [obj.length, obj.pathLength].join(' ');

Take a look here: http://codepen.io/GreenSock/pen/WbNBwO?editors=001


The basic idea is that the createLineTween() function is told which svg to use. It then creates a pathObject and a tween to draw the stroke.

That tween is then passed into a timeline via the add() method.


It appears the path of the rectangle isn't closing completely... not exactly sure why

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So neat!


Thank you. Thank you. Thank you....

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