count keyframes to current time

[openskies2009]

Letssay I have a keyframe of text source layer changing every second for ten seconds, and the playhead is somewhere between five and six seconds. I want an expression to count all all previous keyframes, so it would return five in this case. Once we jump up to six seconds it returns six, counting all the previous source text key-frames. how would I do this?

[Theodoros Tziatzios]

Let's call your text layer with the keyframes on the Source Text: myText

Create a second empty text layer and put this expression on its Source Text:

if (thisComp.layer("myText").text.sourceText.nearestKey(time).time > time) {
  thisComp.layer("myText").text.sourceText.nearestKey(time).index-1;
} else {
  thisComp.layer("myText").text.sourceText.nearestKey(time).index;
}

Hope this helps.

And this thread should be moved to the Expressions Sub-forum