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I have 2 check-boxes.

  • Checkbox 1: Attend event for 1 day
  • Checkbox 2: Attend event for 2 days

If a checkbox is selected, I want to hide the other one. I don't want the user to be able to select both. If I create 2 rules, I get a circular reference error which breaks the form.

How do I achieve what I described?

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  • There are some modules that do this on drupal.org for various versions of Drupal.
    – mradcliffe
    Commented Jul 12, 2018 at 14:11

2 Answers 2

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Simple solution: Don't use 2 fields with checkboxes, use one field with radio buttons.

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If you really need 2 checkboxes instead of a radio button, do the following: example with 2 checkboxes (Day1 and Day2).

enter image description here

For checkbox Day1 chose the following under Edit-Conditions

enter image description here

For checkbox Day2 do the same just vice versa.

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