Validating CCK Form Fields

Custom validations with form error set on CCK may require custom coding. This is one such exercise for both Drupal 6 and Drupal 7.

Drupal 6

<?php /** * Validations for Employee Leave */ function custom_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) { if ($op == 'validate' && $node->type == 'lms') { $start_date =$node->field_lms_start_date[0]['value']; $end_date =$node->field_lms_end_date[0]['value']; if($start_date > $end_date){ form_set_error('field_lms_start_date', 'Start Date of Leave Should be less than End Date of Leave'); } } } ?>

Drupal 7

<?php function custom_form_alter(&$form, &$form_state, $form_id) { if($form_id == 'exam_node_form') { $form['#validate'][] = 'custom_exam_node_form_validate'; } } function custom_exam_node_form_validate(&$form, &$form_state){ $exam_type = $form_state['values']['field_exam_assessment'][LANGUAGE_NONE][0]['tid']; if($exam_type == 45){ // External Assessment form_set_error('field_exam_assessment',"Teaching Staff cannot create Assessment of type External. Please contact administrator"); } } ?>