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Forums Adobe After Effects Expressions Letters appearing in Alphabetical Order via Expression

  • Letters appearing in Alphabetical Order via Expression

  • Justin Viney

    November 18, 2019 at 4:54 am

    Hi, I’m looking to create a motion graphics sequence similar to the intro sequence of Birdman with the individual letters appearing in alphabetical order. I know how to make them appear randomly and I could do this manually via masking but was wondering if I could make an expression for the Animate:Opacity value to automate this for me.


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  • Oleg Pirogov

    November 18, 2019 at 11:26 am

    An Expression Selector for the Opacity Animator (with Opacity value = 0%) with this expression:

    text.sourceText.value.charCodeAt(textIndex-1)-97+1 <= time ? 0 : 100;

    will make letters appear in alphabetical order with the period of 1 second. This will work for the text consisting of lower-case letters only. If you change “97” to “65”, it will do the same for an all-upper-case-letters text.

  • Justin Viney

    November 25, 2019 at 1:51 am

    Hi Oleg, thanks for your reply. I tried the expression in the Animate Opacity Range Selector but am getting the message “property or method named ‘textIndex’ in Class ‘global’ is missing or does not exist. It may have been renamed, moved, deleted, or the name may have been mistyped.” I’ve attached a screenshot of my timeline below:

  • Oleg Pirogov

    November 25, 2019 at 11:14 am

    You should add an Expression Selector and use that expression for it, not Opacity.

  • Juan Lesta

    May 11, 2020 at 5:50 pm

    Thanks a lot Oleg.
    I am having problems trying to use this effect.
    I used an Expression selector unsuccessfully,

    any help will be welcome!!

    Thanks in advance

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