Range Selector /Advanced/Mode question

Question

Hello friends, I ran into a problemI want the parameter Range Selector /Advanced/Mode switching using the checkbox controllerFor example, if the check box is off, value AddIf the check box is on, value SubstractPlease respond, knowledgeable friends! I am very bad at expressionsChat GPT does not know anything about this))effect("Reverse Direction")("Checkbox") == 1 ? 1 : 0;this code doesn't workThanks in advance!

Rick Gerard · Answer

In my experience, using Chat GBT to help or create expressions for After Effects has a success rate of about 10%.

Numbers, not names, drive menus like the Range Selector/Advanced/Mode. The numbers start from 1, not zero.

The easiest way to understand what is going on is to use an if/else statement:

ctrl = effect("Checkbox Control")("Checkbox");
if (ctrl == 0)
	1;
else
	2;

Without an if statement, the expression would look like this:

ctrl = effect("Checkbox Control")("Checkbox");
ctrl == 0 ? 1 : 2;

Setting up an Effect/Expression Control as a variable is always a good idea. The ctrl checkbox switch starts at 0 for not selected, then goes to 1.

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