• Adobe After Effects Expressions

  if/else exists expression

  Posted by Scott Mcgee on October 12, 2017 at 10:19 am

  for (var i = 1; i <= myComp.numLayers; i++){
  var myComp = app.project.activeItem;
  var nNum = myComp.layer(i).effect(“Name”)(“Slider”).value;
  var name = myObject[nNum].name;
  myComp.layer(i).name = name;
  };

  I’m having a little problem with my script.

  My name layers will never be the same, but the ones I want to effect will all have the slider “Name”…Again value will differ. The number is for my JSON reference…

  Now…The above expression in my script works fine, if I don’t have any other layers that have no slider or a different slider.

  I don’t have a way to reference the content of the slider, so I need it to say “if I exist change me else continue” I’ve tried a few things with no success.

  I’m sure I’ve read someone with a similar situation, but I’ve read about 50 different forums and can’t find anything. Any ideas?

  Scott Mcgee replied 8 years, 10 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  October 12, 2017 at 1:03 pm

  One way might be to use try/catch:

  
try{
// try to do something here
}catch(err){
continue; // end up here if it don't work
}


  Dan
• 

  Scott Mcgee

  October 12, 2017 at 1:30 pm

  I am a moron….

  I even tried a try/catch, but did it every wrong way possible, even when you posted that I did it wrong initially again and realised I have to put it in the loop for it too work, because I want to reference 4 categories I’ve been trying to put the try outside of it.

  That is working sport on now.

  Thank you for putting that, I would have gone around in circles otherwise.

  for (var i = 1; i <= myComp.numLayers; i++){

  try{
  var nNum = myComp.layer(i).effect(“Name”)(“Slider”).value;
  var name = myObject[nNum].name;
  myComp.layer(i).name = name;
  }catch(err){
  continue;
  }
  };

  for (var i = 1; i <= myComp.numLayers; i++){

  try{
  var lNum = myComp.layer(i).effect(“Location”)(“Slider”).value;
  var location = myObject[lNum].location;
  myComp.layer(i).name = location;
  }catch(err){
  continue;
  }
  };

  Unless you can think of a tidier way for this…I only have to do it 4 times and it’s only a find and replace. Last year I typed 480 text layers out, I’m doing it again this year and giving myself RSI hahahaha.

  Appreciate that.

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