How to display and hide Drupal 7 fields, based on value of a specific field?

You can create a module and add a hook on node form using : hook_form_alter or hook_form_FORM_ID_alter.

I'm having a similar issue. I've created a working custom module called "bp" and I've gotten other "hook_" function to work using the bp_name_of_hook function naming. However I can't seem to hook into the form_alter function.

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