• Adobe After Effects Expressions

  Only One Checkbox Selected Expression

  Posted by Nathaniel Costa on August 10, 2015 at 3:53 pm

  I have three checkboxes on a layer.
  Only one box should be checked at a time.
  I wrote an expression to uncheck the other two boxes when one is checked.
  It works until the playhead is moved then it reverts to the original values of the checkboxes.

  Can anyone help me figure this out?

  

  Kalleheikki Kannisto replied 7 years, 6 months ago 5 Members · 5 Replies
• 5 Replies

• 

  Dan Ebberts

  August 10, 2015 at 4:11 pm

  My advice–think of another way to do what you’re trying to do. I don’t think there’s a stable solution to the “force checkboxes to act like radio buttons” problem.

  Dan
• 

  Nathaniel Costa

  August 10, 2015 at 4:26 pm

  Thanks
• 

  Luis Martinez

  August 25, 2015 at 6:01 am

  I had the same problem once and I think Dan is right, there is no such thing in AE as “radio button code”. The solution I found was rather elegant: Pop-up menus.

  These pop-ups behave just like radio buttons, the only downside is that they’re not available as expression controls yet within AE (like Point, Color, Angle, etc.), so you must built a Pseudo Effect first and place them there. I use BatchFrame’s Custom Controls Creator and it works pretty well. I recommend you to watch all the tutorials so you can see how it works.

  Cheers.
• 

  Martin Lanciano

  January 31, 2019 at 6:41 pm

  This seems to do the trick:

  

  a=effect("a")("Checkbox");
b=effect("b")("Checkbox");
c=effect("c")("Checkbox");

  if (a+b+c == 0)

  { 1 }

  else if (a+b+c > 1)

  { 0 }

  else { value }

• 

  Kalleheikki Kannisto

  February 3, 2019 at 12:28 pm

  Moving forward on the timeline, the checkbox reverts to “a”.

  Kalleheikki Kannisto
  Senior Graphic Designer

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