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get name from effect controls and add them to expression

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Sam Catt
get name from effect controls and add them to expression
on May 16, 2018 at 10:05:56 pm

So i've been pondering on this for a while now.

I want to select a layer and, in an AE UI input text field specify how many iterations of an effect control I want: I.E

Target 1
Target 2
Target 3
Target 4
Target 5

etc etc. I have this working perfectly. Now I want to be able to take the effect control names and add them to the layers expression

I.E:

- start of expression here -
target 1
target 2
target 3
target 4
target 5
- end of expression here -

my guess, is I would have to create an array? and then link back to the arrays name in the expression = "";

Though I have no idea how to actually go about doing that exact thing. My current code is below, ignore the "5" in for (var n = 0; n < 5; n++){ it's a dummy for selecting 5 in te UI text box

app.beginUndoGroup("Dynamic Parenting");

var myComp = app.project.activeItem;

if (myComp == null || !(myComp instanceof CompItem)){
alert(errorNoCompSelected);
} else {
var selectedLayers = myComp.selectedLayers;

if (selectedLayers.length==0) {
alert(errorNoLayerSelected);
} else {
for (var i = 0; i &lt; selectedLayers.length; i++){
selectedLayers[i].property("Rotation").expression = "Target 1";
var effectLocation = selectedLayers[0].property("Effects");
var effectCount = effectLocation.numProperties;
for (var n = 0; n &lt; 5; n++){
var addEffect = selectedLayers[0].property("Effects").addProperty("Layer Control");
var nPlusOne = n+1
addEffect.name = "target" + " \""+nPlusOne+"\" ";
var addEffect = selectedLayers[0].property("Effects").addProperty("Slider Control");
addEffect.name = "fade" + " \""+nPlusOne+"\" ";
}
for (var m = 1; m &lt;= 1; m++){
var currentExpression = selectedLayers[0].property("Rotation").expression;
selectedLayers[0].property("Rotation").expression = " \""+currentExpression+"\" " + "something";
}


}
}
}


app.endUndoGroup();


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