Form validation issue

edited August 2015 in Modules
Hi,
I just wanted to ask if you have an idea to solve my issue...
I have a simple module create form where I can add some values and have checkbox to control if these values will be displayed in the frontend. Now I thought to have a cross-validation like: if checkbox show_city is true, then the field city should be a required field. if show_city is false, the field should be optional...

Is that possible with the form builder api?

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