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If you’re after the button to return the button’s name, try this:

button.onClick = function() {
alert(this.name);
}

A quick and dirty workaround would be to iterate back through your selected properties after applying the initial loop expression and identify those which have their expression turned off and apply the path loop expression to just those.

Are you sure you meant to post inside the After Effects Expressions forum?

I’m not sure on your use case, but say if you wanted to have a null object locked to the position of Rectangle 1 inside of Shape Layer 1, you could put this expression on the position of the null:

toWorld(thisComp.layer("Shape Layer 1").content("Rectangle 1").transform.position)

‘toWorld()’ converts layer space to world/comp space.

No. You’d need to look into scripting for that sort of functionality!

They are returning undefined because you haven’t defined them with

var

You could use

str.charAt(0)

where the argument, in this case, ‘0’, is the character of the string you want to look at. So something like this:

str = text.sourceText;
firstLetter = str.charAt(0);
if (firstLetter ===  "A") {
	[0,100]
} else if (firstLetter ===  "B") {    
	[0,200]
}

If you wanted to do it programmatically, perhaps something like this would…

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Instead of using

==

you’ll need to use

>= or <=

Yeah, the issue here is that you also need to update the bezier handles as you make the circle bigger. You have two options.

1. Redo your process with this script instead:

New Create Nulls From Paths Extended Includes More Features

and make sure ‘handle controls’ is checked. Then you’ll also need to animate the scale of each of the 4…

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This is super impressive.

It’s a drop down menu, so you need to set the value to the index of the option you want.

So something like this:

app.project.item(1).layer("Shape Layer 1").property("Contents").property("Shape 1").property("Contents").property("Stroke 1").property("Line Join").setValue(2);

Yeah.

seedRandom(a,b)

takes two arguments. a is the seed itself and b is ‘timeless’.

If you set timeless = true, the expression won’t reevaluate every frame – I think this is what you need.

So in summary, try this:

seedRandom(index,true);
start = random(1,90);
transComplete = effect(“Mask Fade Controls”)(“Transition Compl…

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Sure, try this. Parent the null to the rectangle, and put this expression in the null’s position property.

myRectangle = //pickwhip your rectangle
l = myRectangle.sourceRectAtTime().left;
t = myRectangle.sourceRectAtTime().top;
h = myRectangle.sourceRectAtTime().height;
[l,t + h/2];

It’s worth noting you’ll need to ‘unseparate’ the null’s position dimensions.

You could draw the wavy lines as paths, trace them using ‘Create Nulls From Paths’ and then drive the size of the circle by the position of the resulting nulls?