progress NaN on tween's with duration 0

[erikb 28 Likes (Newbie)]

Programmatically setting a tween with duration 0 results in progress calls returning NaN.

I expected 1.

 

This is an edge case, but seemed worth reporting as it caused me to stumble.

Thank for taking a look at this issue and happy tweening to you all.

See the Pen GLQYyE?editors=0010 by jedierikb (@jedierikb) on CodePen

[Rodrigo 5,042 Likes (Superhero)]

If you ask me it seems about right.

 

Keep in mind that .set() instances are zero duration instances so, something that actually lasts nothing can have a progress? Is it at the start or the end?  So to me is actually correct that it doesn't have a progress.

 

Of course the Yoda of GSAP, our beloved master @GreenSock will clarify this for us all why set tweens progress don't have

 

Happy Tweening!!

[GreenSock 18,231 Likes (Superhero)]

Yeah, progress is basically a ratio of time / duration. So if the denominator is zero, you're gonna get NaN. 

 

You could tap into the ratio value and do something like this instead: 

 

console.log( t.duration() ? t.progress() : t.ratio );

 

So if the duration is zero, it'll just default to reporting the ratio. 

[erikb 28 Likes (Newbie)]

Thank you, that is a good idea re: ratio.