The gform_before_delete_field Gravity Forms action hook allows you to perform actions right before a field is deleted from a form.
Usage
add_action('gform_before_delete_field', 'do_cleanup', 10, 2);
Parameters
$form_id(integer) – ID of the current form.$field_id(integer) – ID of the deleted field.
More information
See Gravity Forms Docs: gform_before_delete_field
Examples
Log Field Deletion
This example adds a log file entry when a field is deleted.
add_action('gform_before_delete_field', 'log_field_deleted', 10, 2);
function log_field_deleted($form_id, $field_id) {
$log_file = ABSPATH . '/gf_deleted_fields.log';
$f = fopen($log_file, 'a');
$user = wp_get_current_user();
$form = GFAPI::get_form($form_id);
$field = RGFormsModel::get_field($form, $field_id);
fwrite($f, date('c') . " - Field deleted by {$user->user_login}. Form ID: {$form_id}. Field: {$field["label"]} (ID: {$field_id})\n");
fclose($f);
}