drupal: Form API, dynamically hide or show fields based on input

php drupal drupal-7 drupal-fapi drupal-forms
LoneWolfPR picture LoneWolfPR · Oct 5, 2012 · Viewed 13.5k times · Source

I'm building a form module. One of the early fields is a set of radio buttons. By default the first button is selected. Next I'll have a series of select boxes. One needs to be visible, the others invisible. Then as the user selects a different radio button I want different select boxes to show or hide. How can I hide the field and label by default and show it later dependent upon which radio button (or another select box option for that matter) is chosen?

Answer

Muhammad Reda picture Muhammad Reda · Oct 6, 2012

You can use the #states property to achieve that. The #states property can be applied to all Form API elements.

Here's the documentation link with an example.

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