In rules you have the ability to check whether a field in a form has been changed by negating node-unchanged:field-xyz = 123.
I want to check whether a field has changed programmatically with the $form and $form_state.
How would you do this?
In rules you have the ability to check whether a field in a form has been changed by negating node-unchanged:field-xyz = 123.
I want to check whether a field has changed programmatically with the $form and $form_state.
How would you do this?
$formdefault value vs the$form_statevalue. If they are not equal, then there was a change. You'll want to do this inside a custom form validate or submit function. Usehook_form_alterto add your custom validate or submit function. See: Custom validation for a form? as an example.