clientside_validation.module 26.8 KB
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<?php
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// $Id$
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/**
 * @file
 * Add client side validation to a webform.
 */

/**
 * Implementation of hook_form_alter().
 */
function clientside_validation_form_alter(&$form, &$form_state, $form_id) {
  if (strpos($form_id, 'webform_client_form') !== FALSE) {
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    if (isset($form['actions']['previous'])) {
      if (isset($form['actions']['previous']['#attributes'])) {
        if (isset($form['actions']['previous']['#attributes']['class'])) {
          $form['actions']['previous']['#attributes']['class'] .= ' cancel';
        }
        else {
          $form['actions']['previous']['#attributes']['class'] = 'cancel';
        }
      }
      else {
        $form['actions']['previous']['#attributes']['class'] = 'cancel';
      }
    }
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    $form['#after_build'][] = 'clientside_validation_webform_after_build';
  } 
  else {
    switch ($form['#id']) {
      case 'node-form':
      case 'webform-component-edit-form':
        $form['#after_build'][] = 'clientside_validation_form_after_build';
        break;
      default:
        $form['#after_build'][] = 'clientside_validation_form_after_build';
        break;
    }
  }
}

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/**
 * Implements hook_menu().
 */
function clientside_validation_menu() {
  $items['admin/structure/clientside_validation'] = array(
    'title' => 'Clientside Validation',
    'description' => 'Administer clientside validation.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('clientside_validation_admin_settings'),
    'access arguments' => array('administer site configuration'),
  );
  return $items;
}

function clientside_validation_admin_settings() {
  $form['clientside_validation'] = array(
    '#type' => 'fieldset',
    '#collapsible' => FALSE,
    '#collapsed' => FALSE,
    '#title' => t('Field name formatting'),
    '#description' => t('You can define the prefix and suffix of the field names in the error messages here.'),
  );
  $form['clientside_validation']['clientside_validation_prefix'] = array(
    '#title' => t('Field name prefix'),
    '#description' => t('The prefix of the field name in the error messages.'),
    '#type' => 'textfield',
    '#default_value' => variable_get('clientside_validation_prefix', ''),
  );
  $form['clientside_validation']['clientside_validation_suffix'] = array(
    '#title' => t('Field name suffix'),
    '#description' => t('The suffix of the field name in the error messages.'),
    '#type' => 'textfield',
    '#default_value' => variable_get('clientside_validation_suffix', ''),
  );
  $form['clientside_validation']['example_image'] = array(
    '#type' => 'item',
    '#title' => t('Example'),
    '#value' => '<img id="clientside_validation_example_image" src="' . base_path() . drupal_get_path('module', 'clientside_validation') . '/errormsg.png" alt="' . t('Error message example') . '" />',
    '#description' => t('Filling in double quotes in both the above fields will give this result.'),
  );

  $form['clientside_validation_min'] = array(
    '#type' => 'fieldset',
    '#collapsible' => FALSE,
    '#collapsed' => FALSE,
    '#title' => t('Use minified version of jquery.validate.js'),
    '#description' => t('You can use the minified version of the library.'),
  );
  $form['clientside_validation_min']['clientside_validation_use_minified'] = array(
    '#type' => 'radios',
    '#options' => array(
      '0' => t('No'), 
      '1' => t('Yes')
    ),
    '#default_value' => variable_get('clientside_validation_use_minified', 0), 
    '#title' => t('Use minified version?'),
  );
  
  return system_settings_form($form);
}

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/**
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 * Webform.
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 */
function clientside_validation_webform_after_build(&$form, &$form_state) {
  $js_rules = array();
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  clientside_validation_webform_after_build_recurse($form['#id'], $form, $form_state, $js_rules);
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  if ($webform_validation_rules = clientside_validation_webform_validation($form_state['values']['details']['nid'])) {
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    foreach ($webform_validation_rules as $webform_validation_rule) {
      switch ($webform_validation_rule['validator']) {
        case 'min_length':
          foreach ($webform_validation_rule['components'] as $component) {
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          $message = t('!name field has a minimum length of !minl characters.', array('!name' => variable_get('clientside_validation_prefix', '') . $component['name'] . variable_get('clientside_validation_suffix', ''), '!minl' => $webform_validation_rule['data']));
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           _clientside_validation_set_minmaxlength('submitted[' . $component['form_key'] . ']', $component['name'], $webform_validation_rule['data'], '', $js_rules, $message);
          }
          break;
        case 'max_length':
          foreach ($webform_validation_rule['components'] as $component) {
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            $message = t('!name field has a maximum length of !maxl characters.', array('!name' => variable_get('clientside_validation_prefix', '') . $component['name'] . variable_get('clientside_validation_suffix', ''), '!maxl' => $webform_validation_rule['data']));
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            _clientside_validation_set_minmaxlength('submitted[' . $component['form_key'] . ']', $component['name'], '', $webform_validation_rule['data'], $js_rules, $message);
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          }
          break;
        case 'numeric':
          foreach ($webform_validation_rule['components'] as $component) {
            $range = explode('-', $webform_validation_rule['data']);
            if (!empty($range[0]) && $range[0] != '0') {
              if (!isset($range[1])) {
                $range[1] = $range[0];
                $range[0] = 0;
              }
              _clientside_validation_set_minmax('submitted[' . $component['form_key'] . ']', $component['name'], $range[0], $range[1], $js_rules);
            }
          }
          break;
        case 'equal':
          $others = $webform_validation_rule['components'];
          $firstone = array_shift($others);
          foreach ($others as $component) {
            _clientside_validation_set_equal('submitted[' . $component['form_key'] . ']', $component['name'], $firstone, $js_rules);
          }
          break;
        case 'unique':
          $all = $webform_validation_rule['components'];
          while (count($all) > 1) {
            $firstone = array_shift($all);
            foreach ($all as $component) {
              $message = (isset($webform_validation_rule['error_message']) && !empty($webform_validation_rule['error_message'])) ? $webform_validation_rule['error_message'] : '';
              _clientside_validation_set_not_equal('submitted[' . $component['form_key'] . ']', $component['name'], $firstone, $js_rules, $message);
            }
          }
          break;
        case 'specific_value':
          foreach ($webform_validation_rule['components'] as $component) {
            $value = explode(',', $webform_validation_rule['data']);
            $message = (isset($webform_validation_rule['error_message']) && !empty($webform_validation_rule['error_message'])) ? $webform_validation_rule['error_message'] : '';
            _clientside_validation_set_specific_value('submitted[' . $component['form_key'] . ']', $component['name'], $value, $js_rules, $message);
          }
          break;
        case 'select_min':
          foreach ($webform_validation_rule['components'] as $component) {
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            _clientside_validation_set_minmaxlength('submitted[' . $component['form_key'] . ']', $component['name'], $webform_validation_rule['data'], '', $js_rules);
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          }
          break;
        case 'select_max':
          foreach ($webform_validation_rule['components'] as $component) {
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            _clientside_validation_set_minmaxlength('submitted[' . $component['form_key'] . ']', $component['name'], '', $webform_validation_rule['data'], $js_rules);
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          }
          break;
        case 'select_exact':
          foreach ($webform_validation_rule['components'] as $component) {
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            _clientside_validation_set_minmaxlength('submitted[' . $component['form_key'] . ']', $component['name'], $webform_validation_rule['data'], $webform_validation_rule['data'], $js_rules);
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          }
          break;
        case 'validEAN':
          foreach ($webform_validation_rule['components'] as $component) {
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            $message = (isset($webform_validation_rule['error_message']) && !empty($webform_validation_rule['error_message'])) ? $webform_validation_rule['error_message'] : 'Not a valid EAN number.';
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            _clientside_validation_set_ean('submitted[' . $component['form_key'] . ']', $component['name'], $js_rules, $message);
          }
          break;
      }
    }
  }
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  if (!empty($js_rules)) {
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    $settings['clientsideValidation']['general'] = array(
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      "errorClass" => "error",
      "wrapper" => "li",
    );
    $settings['clientsideValidation']['forms'][$form['#id']]['settings'] = array(
      "errorContainer" => "#formerrors-" . $form['#id'],
      "errorLabelContainer" => "#formerrors-" . $form['#id'] . " ul",
    );
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    foreach ($js_rules as $key => $rule) {
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      if (isset($rule['checkboxgroupminmax'])) {
        $settings['clientsideValidation']['forms'][$form['#id']]['checkboxrules'][$key] = array(
            'checkboxgroupminmax' => $rule['checkboxgroupminmax'],
            'messages' => array('checkboxgroupminmax' => $rule['messages']['checkboxgroupminmax'])
        );
        unset($rule['checkboxgroupminmax']);
        unset($rule['messages']['checkboxgroupminmax']);
        if (empty($rule['messages'])) {
          unset($rule['messages']);
        }
      }
      if (!empty($rule)) {
        $settings['clientsideValidation']['forms'][$form['#id']]['rules'][$key] = $rule;
      }
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    }
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    if (variable_get('clientside_validation_use_minified', 0) == 0) {
      drupal_add_js(drupal_get_path('module', 'clientside_validation') . '/jquery-validate/jquery.validate.js');
    }
    else {
      drupal_add_js(drupal_get_path('module', 'clientside_validation') . '/jquery-validate/jquery.validate.min.js');
    }
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    drupal_add_js(drupal_get_path('module', 'clientside_validation') . '/clientside_validation.js');
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    drupal_add_js($settings, 'setting');
  }
  return $form;
}

function clientside_validation_webform_after_build_recurse($form_id, &$form, &$form_state, &$js_rules) {
  if ($children = array_values(element_children($form))) {
    foreach ($children as $index => $item) {
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      $element = $form[$item];
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      if (isset($element['#title'])) {
        if ($element['#required']) {
          if (isset($element['#webform_component']) && $element['#webform_component']['type'] == 'time' && isset($element['hour']['#name'])) {
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            $message = t('Hour in !name field is required.', array('!name' => variable_get('clientside_validation_prefix', '') . $element['#title'] . variable_get('clientside_validation_suffix', '')));
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            _clientside_validation_set_required($element['hour']['#name'], $element['#title'], TRUE, $js_rules, $message);
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            $message = t('Minute in !name field is required.', array('!name' => variable_get('clientside_validation_prefix', '') . $element['#title'] . variable_get('clientside_validation_suffix', '')));
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            _clientside_validation_set_required($element['minute']['#name'], $element['#title'], TRUE, $js_rules, $message);
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          }
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          elseif (isset($element['#webform_component']) && $element['#webform_component']['type'] == 'date') {
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            $message = t('Month in !name field is required.', array('!name' => variable_get('clientside_validation_prefix', '') . $element['#title'] . variable_get('clientside_validation_suffix', '')));
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            _clientside_validation_set_required($element['#name'] . '[month]', $element['#title'], TRUE, $js_rules, $message);
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            $message = t('Day in !name field is required.', array('!name' => variable_get('clientside_validation_prefix', '') . $element['#title'] . variable_get('clientside_validation_suffix', '')));
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            _clientside_validation_set_required($element['#name'] . '[day]', $element['#title'], TRUE, $js_rules, $message);
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            $message = t('Year in !name field is required.', array('!name' => variable_get('clientside_validation_prefix', '') . $element['#title'] . variable_get('clientside_validation_suffix', '')));
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            _clientside_validation_set_required($element['#name'] . '[year]', $element['#title'], TRUE, $js_rules, $message);
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            if (is_numeric($element['#year_start']) && is_numeric($element['#year_end'])) {
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              $message = t('The entered date needs to be between the years @start and @end.', array('@start' => $element['#year_start'], '@end' => $element['#year_end']));
              _clientside_validation_set_minmax($element['#name'] . '[year]', $element['#title'], $element['#year_start'], $element['#year_end'], $js_rules, $message);
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            }            
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          }
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          elseif ($element['#type'] == 'checkboxes') {
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            $id = '#' . $element['#id'];
            _clientside_validation_set_checkboxgroup_minmax($element['#name'], $element['#title'], $id, $js_rules);
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          }
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          elseif ($element['#type'] == 'select' && $element['#multiple']) {
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            _clientside_validation_set_required($element['#name'] . '[]', $element['#title'], TRUE, $js_rules);
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          }
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          elseif (isset($element['#type'])) {
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            _clientside_validation_set_required($element['#name'], $element['#title'], TRUE, $js_rules);
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          }
        }
        if (isset($element['#webform_component']) && $element['#webform_component']['type'] == 'file' && $element['#webform_component']['mandatory'] == "1") {
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          _clientside_validation_set_required($element['#name'], $element['#title'], TRUE, $js_rules);
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          if (isset($element['#webform_component']['extra']['filtering']['types'])) {
            $extensions = $element['#webform_component']['extra']['filtering']['types'];
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            _clientside_validation_set_extensions($element['#name'], $extensions, $js_rules);
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          }
        }
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        if (isset($element['#maxlength']) && $element['#maxlength']) {
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          $message = t('!name field has a max length of !maxl characters.', array('!name' => variable_get('clientside_validation_prefix', '') . $element['#title'] . variable_get('clientside_validation_suffix', ''), '!maxl' => $element['#maxlength']));
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          _clientside_validation_set_minmaxlength($element['#name'], $element['#title'], '', $element['#maxlength'], $js_rules, $message);
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        }
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        if (isset($element['#webform_component']) && $element['#webform_component']['type'] == 'email') {
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          _clientside_validation_set_email($element['#name'], $element['#title'], $js_rules);
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        }
      }
      clientside_validation_webform_after_build_recurse($form_id, $element, $form_state, $js_rules);
    }
  }
}

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/**
 * Implements hook_webform_validation().
 */
function clientside_validation_webform_validation($nid) {
  static $webform_validation_rules;
  if (!isset($webform_validation_rules[$nid])) {
    if (module_exists('webform_validation')) {
      $webform_validation_rules[$nid] = webform_validation_get_node_rules($nid);
    }
    else {
      $webform_validation_rules[$nid] = NULL;
    }
  }
  return $webform_validation_rules[$nid];
}

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/**
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 * Regular form
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 */
function clientside_validation_form_after_build(&$form, &$form_state) {
  static $js_rules = array();
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  clientside_validation_form_after_build_recurse($form['#id'], $form, $form_state, $js_rules);
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  if (!empty($js_rules)) {
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    $settings['clientsideValidation']['general'] = array(
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      "errorClass" => "error",
      "wrapper" => "li",
    );
    $settings['clientsideValidation']['forms'][$form['#id']]['settings'] = array(
      "errorContainer" => "#formerrors-" . $form['#id'],
      "errorLabelContainer" => "#formerrors-" . $form['#id'] . " ul",
    );
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    foreach ($js_rules as $key => $rule) {
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      if (isset($rule['checkboxgroupminmax'])) {
        $settings['clientsideValidation']['forms'][$form['#id']]['checkboxrules'][$key] = array(
            'checkboxgroupminmax' => $rule['checkboxgroupminmax'],
            'messages' => array('checkboxgroupminmax' => $rule['messages']['checkboxgroupminmax'])
        );
        unset($rule['checkboxgroupminmax']);
        unset($rule['messages']['checkboxgroupminmax']);
        if (empty($rule['messages'])) {
          unset($rule['messages']);
        }
      }
      if (!empty($rule)) {
        $settings['clientsideValidation']['forms'][$form['#id']]['rules'][$key] = $rule;
      }
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    }
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    if (variable_get('clientside_validation_use_minified', 0) == 0) {
      drupal_add_js(drupal_get_path('module', 'clientside_validation') . '/jquery-validate/jquery.validate.js');
    }
    else {
      drupal_add_js(drupal_get_path('module', 'clientside_validation') . '/jquery-validate/jquery.validate.min.js');
    }
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    drupal_add_js(drupal_get_path('module', 'clientside_validation') . '/clientside_validation.js');
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    drupal_add_js($settings, 'setting');
  }
  
  return $form;
}

function clientside_validation_form_after_build_recurse($form_id, &$form, &$form_state, &$js_rules) {
  if ($children = array_values(element_children($form))) {
    foreach ($children as $index => $item) {
      $element = &$form[$item];
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      $types = array(
        'textfield', 'textarea', 'select', 'radio', 'checkbox', 'password', 'file', 'radios', 'checkboxes',
      );
      if (isset($element['#type']) && in_array($element['#type'], $types)) {
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        clientside_validation_regular($form_id, $element, $js_rules);
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      }
      clientside_validation_form_after_build_recurse($form_id, $element, $form_state, $js_rules);
    }
  }
}

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function clientside_validation_regular($form_id, $element, &$js_rules) {
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  static $multiples = array();
  if (isset($element['#name']) && !isset($js_rules[$element['#name']])) {
    $el_name = $element['#name'];
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    $el_title = $el_name;
    if (isset($element['#title'])) {
      $el_title = $element['#title'];
    }
    $is_multiple = FALSE;
    if (isset($element['#multiple'])) {
      $is_multiple = $element['#multiple'];
    }
    switch ($element['#type']) {
      case 'textfield':
      case 'password':
      case 'textarea':
      case 'file':
        if ($is_multiple) {
          // Only first field is required
          if (!isset($multiples[$form_id][$el_name])) {
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            _clientside_validation_set_required($el_name, $el_title, $element['#required'], $js_rules);
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            $multiples[$form_id][$el_name] = 1;
          }
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        }
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        else {
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          _clientside_validation_set_required($el_name, $el_title, $element['#required'], $js_rules);
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        }
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        if (isset($element['#maxlength']) && $element['#maxlength'] > 0) {
          _clientside_validation_set_minmaxlength($el_name, $el_title, '', $element['#maxlength'], $js_rules);
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        }
        break;
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      case 'select':
        if ($is_multiple) {
          $el_name .= '[]';
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          if (!isset($element['#minlength'])) {
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            $element['#minlength'] = 0;
          }
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          $max = (($is_multiple === TRUE || $is_multiple == 1) ? '' : $is_multiple);
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          _clientside_validation_set_minmaxlength($el_name, $el_title, $element['#minlength'], $max, $js_rules);
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        }
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        _clientside_validation_set_required($el_name, $el_title, $element['#required'], $js_rules);
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        break;
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      case 'radio':
      case 'radios':
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        _clientside_validation_set_required($el_name, $el_title, $element['#required'], $js_rules);
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        break;
      case 'checkbox':
      case 'checkboxes':
        $is_multiple = (isset($element['#options']) && count($element['#options']>1));
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        if ($is_multiple && $element['#required']) {
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          $id = '#' . $element['#id'];
          _clientside_validation_set_checkboxgroup_minmax($element['#name'], $el_title, $id, $js_rules);
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        }
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        elseif ($element['#required']) {
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          _clientside_validation_set_required($el_name, $el_title, $element['#required'], $js_rules);
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        }
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        break;
    }
  }
}

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/**
 * Set validation rule for required fields.
 */
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function _clientside_validation_set_required($name, $title, $required, &$js_rules, $message = '') {
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  if ($required) {
    $js_rules[$name]['required'] = TRUE;
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    $js_rules[$name]['messages']['required'] = (empty($message)) ? t('!name field is required.', array('!name' => $title)) : $message;
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  }
}

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/**
 * Set validation rule for number fields.
 */
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function _clientside_validation_set_number($name, $title, $decimalpoint, &$js_rules) {
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  $js_rules[$name]['digits_negative'] = TRUE;
  $js_rules[$name]['messages']['digits_negative'] = t('!name field accepts only numbers.', array('!name' => $title));
}

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/**
 * Set validation rule for decimal fields.
 */
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function _clientside_validation_set_number_decimal($name, $title, $decimalpoint, &$js_rules) {
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  if ($decimalpoint == '.') {
    $js_rules[$name]['number'] = TRUE;
    $js_rules[$name]['messages']['number'] = t('!name field accepts only numbers (use a \'.\' as decimal point).', array('!name' => $title));
  }
  else {
    $js_rules[$name]['numberDE'] = TRUE;
    $js_rules[$name]['messages']['numberDE'] = t('!name field accepts only numbers (use a \',\' as decimal point).', array('!name' => $title));
  }
}

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/**
 * Set validation rule for fields with a minimum and/or a maximum value.
 */
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function _clientside_validation_set_minmax($name, $title, $min, $max, &$js_rules, $message = '') {
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  if (isset($min) && $min != '' && isset($max) && $max != '') {
    $js_rules[$name]['range'] = array($min, $max);
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    $js_rules[$name]['messages']['range'] = (empty($message)) ? t('!name field has to be between !min and !max.', array('!name' => $title, '!min' => $min, '!max' => $max)) : $message;
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  }
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  elseif (isset($min) && $min != '') {
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    $js_rules[$name]['min'] = $min;
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    $js_rules[$name]['messages']['min'] = (empty($message)) ? t('!name field has to be greater than !min.', array('!name' => $title, '!min' => $min)) : $message;
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  }
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  elseif (isset($max) && $max != '') {
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    $js_rules[$name]['max'] = $max;
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    $js_rules[$name]['messages']['max'] = (empty($message)) ? t('!name field has to be smaller than !max.', array('!name' => $title, '!max' => $max)) : $message;
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  }
}

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/**
 * Set validation rule for fields with a minimum and/or maximum length.
 */
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function _clientside_validation_set_minmaxlength($name, $title, $min, $max, &$js_rules, $message = '') {
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  if (isset($min) && $min != '' && isset($max) && $max != '') {
    $js_rules[$name]['rangelength'] = array($min, $max);
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    $js_rules[$name]['messages']['rangelength'] = (empty($message)) ? t('!name field has to have between !min and !max values.', array('!name' => $title, '!min' => $min, '!max' => $max)) : $message;
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  }
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  elseif (isset($min) && $min != '') {
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    $js_rules[$name]['minlength'] = $min;
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    $js_rules[$name]['messages']['minlength'] = (empty($message)) ? t('!name field has to have minimal !min values.', array('!name' => $title, '!min' => $min)) : $message;
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  }
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  elseif (isset($max) && $max != '') {
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    $js_rules[$name]['maxlength'] = $max;
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    $js_rules[$name]['messages']['maxlength'] = (empty($message)) ? t('!name field has to have maximum !max values.', array('!name' => $title, '!max' => $max)) : $message;
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  }
}

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/**
 * Set validation rule for required fields that must equal a value from an other field.
 */
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function _clientside_validation_set_equal($name, $title, $value, &$js_rules) {
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  $js_rules[$name]['equalTo'] = ':input[name=\'submitted[' . $value['form_key'] . ']\']';
  $js_rules[$name]['messages']['equalTo'] = t('!name field has to be equal to !firstone.', array('!name' => $title, '!firstone' => $value['name']));
}

/**
 * Set validation rule for fields that can not be equal to a value from an other field.
 */
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function _clientside_validation_set_not_equal($name, $title, $value, &$js_rules, $message = '') {
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  $js_rules[$name]['notEqualTo'] = ':input[name=\'submitted[' . $value['form_key'] . ']\']';
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  $message = empty($message) ? t('!name field has to different from !firstone.', array('!name' => $title, '!firstone' => $value['name'])) : $message;
  $js_rules[$name]['messages']['notEqualTo'] = $message;
}

/**
 * Set validation rule for fields that must be equal to a specific value.
 */
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function _clientside_validation_set_specific_value($name, $title, $value, &$js_rules, $message = '') {
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  $js_rules[$name]['oneOf'] = $value;
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  $message = empty($message) ? t('!name field has to different from !firstone.', array('!name' => $title, '!firstone' => $value['name'])) : $message;
  $js_rules[$name]['messages']['oneOf'] = $message;
}

/**
 * Set validation rule for ean number fields.
 */
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function _clientside_validation_set_ean($name, $title, &$js_rules, $message = '') {
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  $message = empty($message) ? t('!name field is not a valid EAN number.', array('!name' => $title)) : $message;
  $js_rules[$name]['validEAN'] = TRUE;
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  $js_rules[$name]['messages']['validEAN'] = $message;
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}

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/**
 * Set validation rule for file fields that must have a certain extension.
 */
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function _clientside_validation_set_extensions($name, $extensions, &$js_rules) {
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  $extension_list = preg_replace('#,(?![^,]+,)#', ' or', implode(', ', $extensions));
  $js_rules[$name]['accept'] = implode('|', $extensions);
  $js_rules[$name]['messages']['accept'] = t("Only files with a %exts extension are allowed.", array('%exts' => $extension_list));
}

/**
 * Set validation rule for checkboxes.
 */
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function _clientside_validation_set_checkboxgroup_minmax($name, $title, $id, &$js_rules, $min = 1, $max = 99) {
  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  $js_rules[$name]['checkboxgroupminmax'] = array($min, $max, $id);
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  $js_rules[$name]['messages']['checkboxgroupminmax'] = t('!name field is required.', array('!name' => $title));
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}

/**
 * Set validation rule for email fields.
 */
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function _clientside_validation_set_email($name, $title, &$js_rules) {
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  $title = variable_get('clientside_validation_prefix', '') . $title . variable_get('clientside_validation_suffix', '');
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  $js_rules[$name]['email'] = TRUE;
  $js_rules[$name]['messages']['email'] = t('The value in !name is not a valid email address.', array('!name' => $title));
}

function clientside_validation_drupal_json_encode($var) {
  return str_replace(array('<', '>', '&'), array('\u003c', '\u003e', '\u0026'), json_encode($var));
}