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<?php
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function multipart_menu($may_cache) {
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$items = array();
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if ($may_cache) {
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$items[] = array('path' => 'multipart', 'access' => TRUE, 'title' => t('Multipart form'), 'callback' => 'multipart_page');
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}
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return $items;
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}
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/**
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* Just a form to demo the multipart.
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*/
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function multipart_page() {
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$form['field1'] = array('#type' => 'textfield', '#title' => 'field1');
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$form['field2'] = array('#type' => 'textfield', '#title' => 'field2');
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$form['field3'] = array('#type' => 'textfield', '#title' => 'field3');
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$form['part']['#tree'] = TRUE;
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$form['part']['field1a'] = array('#type' => 'textfield', '#title' => 'field1a');
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$form['part']['field2a'] = array('#type' => 'textfield', '#title' => 'field2a');
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$form['submit'] = array('#type' => 'submit', '#value' => 'Submit');
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return drupal_get_form('multipart', $form);
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}
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/**
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* Dump the values and restart.
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*/
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function multipart_submit($form_id, $form_values) {
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drupal_set_message(var_export($form_values, TRUE));
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drupal_goto($_GET['q']);
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}
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/**
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* Here you set which stage has which fields.
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*/
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function multipart_fields($stage) {
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$fields = array(
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0 => array('field1' => 1, 'part' => array('field1a' => 1)),
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1 => array('field2' => 1, 'part' => array('field2a' => 1)),
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2 => array('field3' => 1)
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);
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return isset($fields[$stage]) ? $fields[$stage] : array();
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}
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/**
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* This function changes the form accordin to multipart_fields.
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* If you are not calling your submit button 'submit', change it accordingly.
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*/
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function multipart_form_alter($form_id, &$form) {
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if ($form_id == 'multipart') {
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if (isset($_POST['edit']['stage']) && is_numeric($_POST['edit']['stage'])) {
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$current_stage = $_POST['edit']['stage'] + 1;
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}
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else {
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$current_stage = 0;
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}
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if ($current_fields = multipart_fields($current_stage)) {
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$current_fields['submit'] = 1;
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$form['submit']['#type'] = 'button';
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_multipart_hide($form, $current_fields);
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}
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$form['stage'] = array('#type' => 'hidden', '#value' => $current_stage);
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}
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}
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/**
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* This functions walks the form tree and sets non-value elements to hidden.
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*/
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function _multipart_hide(&$form, $current_fields) {
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$children = element_children($form);
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if (empty($children)) {
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if (!isset($current_fields) && $form['#type'] != 'value') {
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$form['#type'] = 'hidden';
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unset($form['#prefix'], $form['#suffix']);
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}
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}
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else {
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foreach (element_children($form) as $key) {
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_multipart_hide($form[$key], isset($current_fields) && isset($current_fields[$key]) ? $current_fields[$key] : NULL);
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}
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}
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}
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