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chromos · (This post was last modified: 09-13-2017 06:42 PM by chromos.)

(09-13-2017 05:33 PM)Tyann Wrote: Hello

In an INPUT, I have 3 checkboxes: choices1 choices2 choices3
I wish that choice1 cancels choice2 and choice 3,
that choice2 or choice3 cancel choice1
but that choice2 and choice3 is possible.
Is it feasible?

I don't know if this is possible in one INPUT, but it looks to me your logic is somewhat redundant, ie. checkbox 1 is unnecessary:

1) checkbox 2 and/or 3 are checked => treat it as checkbox 1 is unchecked;
2) neither checkbox 2 nor checkbox 3 are checked => treat it as checkbox 1 is checked.