Drupal Form API: form_set_error() on a fieldset element.

August 23rd, 2008 |

Drupal

Ever tried to set an error to a fieldset element in the form validate function (form_set_error function)? I tried it and it didn't work. So after some digging around form.inc I found the answer (a clean fix at that!).

Tutorial Requirements:

Drupal 5.
PHPTemplate based theme.
Know how to do a quick Copy and Paste.

First you will open your form.inc file and copy the theme_fieldset() function. Next open your template.php file that can be found in your theme folder (if you are using garland /themes/garland, if your using another theme look for its folder). You will then paste the function in that template.php file and make just a few changes.

<?php
/**
 * Format a group of form items.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: attributes, title, value, description, children, collapsible, collapsed
 * @return
 *   A themed HTML string representing the form item group.
 */
function theme_fieldset($element) {
  if ($element['#collapsible']) {
    drupal_add_js('misc/collapse.js');

    if (!isset($element['#attributes']['class'])) {
      $element['#attributes']['class'] = '';
    }

    $element['#attributes']['class'] .= ' collapsible';
    if ($element['#collapsed']) {
     $element['#attributes']['class'] .= ' collapsed';
    }
  }

  return '<fieldset' . drupal_attributes($element['#attributes']) .'>' . ($element['#title'] ? '<legend>'. $element['#title'] .'</legend>' : '') . ($element['#description'] ? '<div class="description">'. $element['#description'] .'</div>' : '') . $element['#children'] . $element['#value'] . "</fieldset>\n";
}
?>

What needs to happen is we need to override the this themable function in our theme so that we can change the way that the fieldset elements are output. This is one of Drupal's greatest assets, a simple, clean approach to overriding the standard Drupal output.

So after copying that function into your template.php file you need to make a few modifications, change the function name to "phptemplate_fieldset" and add a sinle extra line of code:

<?php
  _form_set_class($element);
?>

So let's put it all together and see what the function becomes:

<?php
/**
 * Format a group of form items.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: attributes, title, value, description, children, collapsible, collapsed
 * @return
 *   A themed HTML string representing the form item group.
 */
function phptemplate_fieldset($element) {
  if ($element['#collapsible']) {
    drupal_add_js('misc/collapse.js');

    if (!isset($element['#attributes']['class'])) {
      $element['#attributes']['class'] = '';
    }

    $element['#attributes']['class'] .= ' collapsible';
    if ($element['#collapsed']) {
     $element['#attributes']['class'] .= ' collapsed';
    }
  }
  _form_set_class($element);
  return '<fieldset' . drupal_attributes($element['#attributes']) .'>' . ($element['#title'] ? '<legend>'. $element['#title'] .'</legend>' : '') . ($element['#description'] ? '<div class="description">'. $element['#description'] .'</div>' : '') . $element['#children'] . $element['#value'] . "</fieldset>\n";
}
?>

Voila, you now have a .error class attached to the fieldset html element after setting a form error using the form_set_error function.

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