Creating custom filters in views 2

A project that I’m currently working on requires a classifieds system which is fairly straight forward to setup. I’m using the location module for users to specify a location of the classified. To make the search easy I created a simple views page with exposed filters, but I wanted to have a select field with only Australian states.

Out of the box the location module only gives you an exposed autocomplete field for the state/province. This is what I was trying to achieve.

From this: filters_fig1_0.jpg

To this: filters_fig2.jpg

The only way I could do this is with a custom filter.

Creating a custom filter

First we have to let views know about your module.

// in locationstate.module
function locationstate_views_api()
  return array(
    'api' => 2,
    'path' => drupal_get_path('module', 'locationstate') . '/inc',

To keep the locationstate module directory tidy we’ll place all views file in the /inc folder.

Create a file called in the /inc directory and add thehook_views_data function.

function locationstate_views_data() {
  $data = array();
  if(module_exists('location')) {
    $data['location']['state_au'] = array(
      'title' => t('States AU'),
      'help' => t('Filter by AU states.'),
      'real field' => 'province',
      'group' => t('Location state'),
      'filter' => array(
        'handler' => 'locationstate_handler_filter_state',
  return $data;

Next we’ll have to register the locationstate_handler_filter_state filter so views is aware of it.

You can do this by using the hook_views_handlers function.

function locationstate_views_handlers() {
  return array(
    'info' => array(
      'path' => drupal_get_path('module', 'locationstate') . '/inc',
    'handlers' => array(
      // The name of my handler
      'locationstate_handler_filter_state' => array(
        // The name of the handler we are extending.
        'parent' => 'views_handler_filter_string',

Finally we’ll have to create the actual filter file. Because the filter is calledlocationstate_handler_filter_state, views will search for with in the /inc directory.

Create a file called and paste the following.

class locationstate_handler_filter_state extends views_handler_filter_string {
   * Shortcut to display the exposed options form.
  function value_form(&$form, &$form_state) {
    $form['value'] = array(
    '#type' => 'select',
    '#title' => t('State'),
    '#options' => array(
      'ACT' => t('ACT'),
      'NSW' => t('NSW'),
      'NT' => t('NT'),
      'QLD' => t('QLD'),
      'SA' => t('SA'),
      'TAS' => t('TAS'),
      'VIC' => t('VIC'),
      'WA' => t('WA'),
    return $form;

There you have it, now you should have a custom views filter. Also check out for more info. I have also attached the module to this post so you guys can download it.

UPDATE: Check this tutorial on creating a filter with SQL joins. Drupal: How to create Views 2 filters for your new module