• Adobe After Effects Expressions

  Logical Operator "Or" and Drop Down Menus

  Posted by Christian Simpson on December 8, 2022 at 5:34 pm

  Hey Friends,
  I am trying to adjust the opacity of a layer using a if/then expression and drop down menus. I would like it if multiple drop down menu options were selected it would adjust the opacity of a layer.
  So basically if I select either option 3 or 4 in my drop down menu it will return 100% opacity, if neither of those are selected it returns 0%. I’ve tried to write this as many ways I know how and nothing seems to work. Any thoughts?

  if(comp("blind_resume_template").layer("blind_resume_control").effect("Sport")("Menu") == 3) || (comp("blind_resume_template").layer("blind_resume_control").effect("Sport")("Menu") == 4)
  	{100} else 0;

  Dan Ebberts replied 3 years, 8 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Dan Ebberts

  December 8, 2022 at 5:45 pm

  This should work:

  m = comp("blind_resume_template").layer("blind_resume_control").effect("Sport")("Menu");
  (m == 3 || m == 4) ? 100 : 0
• 

  Christian Simpson

  December 15, 2022 at 2:32 pm

  That worked perfectly, thank you Dan. I wish I could understand why however lol!
  What does the question mark and colon between 100 and 0 mean?
  Ternary Operator? If so, isn’t a ternary operator simply a more efficient but ultimately similar way to say the above? Shouldn’t the above still work?
  Thanks again for all the help you provide the community.
• 

  Dan Ebberts

  December 15, 2022 at 4:46 pm

  Yes, ternary operator. Yours should work if you balance a couple of mismatched parens I think.

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