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Forums Adobe After Effects Expressions Check Box Expression: if one box is checked, the rest are automatically unchecked or disabled

  • Check Box Expression: if one box is checked, the rest are automatically unchecked or disabled

  • Elizabeth Starr

    May 13, 2020 at 5:32 pm

    I have 5 layers that can each be turned on with a checkbox. Problem is, I need only one box to be able to be checked at a time. Currently, you can check all 5 boxes, resulting in something not so desirable. How can I Iimit one check box checkable at a time?

    Thanks in advance for your help!!!! 🙂

    lay1 = thisComp.layer("INSTAGRAM").effect("Checkbox Control")("Checkbox");
    lay2 = thisComp.layer("TWITTER").effect("Checkbox Control")("Checkbox");
    lay3= thisComp.layer("FACEBOOK").effect("Checkbox Control")("Checkbox");
    lay4= thisComp.layer("YOUTUBE").effect("Checkbox Control")("Checkbox");
    lay5= thisComp.layer("SKYPE").effect("Checkbox Control")("Checkbox");
    lay6= thisComp.layer("SNAPCHAT").effect("Checkbox Control")("Checkbox");
    (lay1==1 || lay2==1 || lay3==1|| lay4==1|| lay5==1|| lay6==1)
    x= 630.5;
    x= 572.5;

  • Dan Ebberts

    May 13, 2020 at 5:37 pm

    In my experience, attempting to simulate radio button behavior with checkboxes is doomed to failure. It may seem like it works, but there are subtle order-of-operation dependencies that will make it unreliable. Can’t you use a dropdown menu instead?


  • Elizabeth Starr

    May 13, 2020 at 5:56 pm

    Sure! How would I rewrite the expression using a dropdown menu?

  • Dan Ebberts

    May 13, 2020 at 6:35 pm

    It depends on how you have things set up, but I guess I’d add a dropdown menu control to a layer named “Controls”, add 3 additional elements to the control and name them to match your previous expression:


    Then add an expression like this to each of your logo layers (this example would be for the FACEBOOK layer (#3 in the list):

    id = thisComp.layer(“Controls”).effect(“Dropdown Menu Control”)(“Menu”).value;
    x = id == 3 ? 630.5 : 572.5; // this is where you specify the id that corresponds to this layer

    Something like that…


  • Elizabeth Starr

    May 15, 2020 at 11:44 pm

    Thanks so much, Dan.

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