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eco_bach

Getting percentage complete of tween

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 Some information, especially the syntax, may be out of date for GSAP 3.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 there a way to easily get the percentage complete of a tween on an object?

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Hi,

 

The engine has the progress() method, which allows to get or set a particular instance's (Tween or Timeline) progress.

 

The value goes between 0 and 1 so it can be easily translated to percentage, in this cae it would be like this:

 

In order to get the value on a given event, for example a click event:

var tn = TweenLite.to(element, time, {vars});

var button = document.getElementById("button"),
    tweenProgress;

button.onclick = function()
{
  tweenProgress = tn.progress();
}

To get the value as the tween plays:

var tn = TweenLite.to(element, time, {vars, onUpdate:updateFunction}),
    tweenProgress;

function updateFunction()
{
  tweenProgress = tn.progress();
}

Finally to set the tween/timeline progress you just pass a number between 0 and 1 in the progress call:

var tn = TweenLite.to(element, time, {vars});

//set the tween's to be at half it's playtime
tn.progress(0.5);

 Here is a codepen that show how you can get the tween's progress:

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

 

Rodrigo.

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