• Adobe After Effects Expressions

  Is it possible to check if layer has an effect applied to it

  Posted by Billy Sides on April 21, 2015 at 5:36 pm

  I need to check if a layer below a layer has an effect applied to it.
  The problem I’m running into is if the effect doesn’t exist AE throws an error and disables the expression. Is there a way around this? I’ve tried other variations with little luck.

  My goal is to check if the layer below has a checkbox effect applied to it, then to check the value of the checkbox.

  if(checkbox exists && checkbox == true){
  50;
  }else{
  0;
  }

  if(thisComp.layer(index+1).effect("My Checkbox")("Checkbox")!= undefined && thisComp.layer(index+1).effect("My Checkbox")("Checkbox")==true){
50;
}else{
0;
}

  -bsides

  Dan Ebberts

  

  replied 11 years ago 2 Members · 1 Reply
• 1 Reply

• 

  Dan Ebberts

  April 21, 2015 at 5:55 pm

  I think I’d do it this way:

  
try{
if (thisComp.layer(index+1).effect("My Checkbox")("Checkbox").value == 1) 50 else 0;
}catch (err){
0;
}


  Dan

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