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jvandyk |
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<?php
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// $Id$
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/**
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* Implementation of hook_help().
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*/
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function multipage_form_example_help($section) {
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switch ($section) {
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case 'admin/modules#description':
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return t('An example module showing how to handle multipage forms in FAPI.');
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case 'node/add#multipage_form_example':
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return t('This will show you an example multipage form submission.');
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}
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}
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/**
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* Implementation of hook_menu().
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*/
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function multipage_form_example_menu($may_cache) {
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$items = array();
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if (!$may_cache) {
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$items[] = array('title' => t('multipage form example'),
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'path' => 'node/add/multipage_form_example',
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'access' => TRUE,
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);
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}
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return $items;
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}
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/**
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* Implementation of hook_access().
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*/
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function multipage_form_example_access($op, $node) {
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return TRUE;
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}
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/**
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* Implementation of hook_node_info().
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*/
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function multipage_form_example_node_info() {
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return array('multipage_form_example' => array('name' => t('multipage form example'), 'base' => 'multipage_form_example'));
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}
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/**
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* Implementation of hook_form() for multipage_form_example. We don't set ANY
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* #required attributes here - we leave that up to multipage_form_example_pre_render().
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*/
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function multipage_form_example_form(&$node) {
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$form = array();
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// 'checkboxes' elements are just ridiculously hard--i recommend just
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// using a bunch of individual checkbox elements instead.
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// I suspect that multiselects would also be pretty difficult...
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// Here's a new form element, which enables you to store hidden values
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// in an array. Check out the element definition functions at the bottom
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// if you want to use this in a module. Keys show up in the
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// $_POST/$form_values like:
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// $_POST['edit']['test_hidden_array']['n'] = 'north'
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// $form_values['test_hidden_array']['n'] = 'north'
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$form['test_hidden_array'] = array(
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'#type' => 'hidden_array',
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'#values' => array('n' => 'north', 'e' => 'east', 'w' => 'west', 's' => 'south', ),
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);
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// Helper for our multipage - does field switching, sets options
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// based on validated $form_values instead of $_POST, and so forth.
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$form['#pre_render'] = array('multipage_form_example_pre_render');
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// Title and body, page 1
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$form['title'] = array(
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'#type' => 'textfield',
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'#title' => t('Title'),
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'#default_value' => isset($node->title) ? $node->title : NULL,
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'#description' => t("Enter a title for your favorites section."),
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'#size' => 60,
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'#maxlength' => 128,
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);
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$form['body'] = array(
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'#type' => 'textarea',
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'#title' => t('Description'),
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'#default_value' => isset($node->body) ? $node->body : NULL,
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'#description' => t('Add any additional info about your favorites.'),
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'#rows' => 20,
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);
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// Person, page 2
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$form['person'] = array(
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// This is a fieldset, but has to be set as such in #pre_render,
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// otherwise we either have the choice of displaying the <fieldset>
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// all the time, or not passing through the values of its children.
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'#title' => t('Your favorite person'),
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);
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$form['person']['fav_person'] = array(
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'#type' => 'textfield',
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'#title' => t('Name'),
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'#default_value' => isset($node->fav_person) ? $node->fav_person : NULL,
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'#description' => t('Enter their real name, or their code name if they like to fly stealth.'),
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);
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$form['person']['fav_person_desc'] = array(
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'#type' => 'textarea',
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'#title' => t('Description'),
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'#default_value' => isset($node->fav_person_desc) ? $node->fav_person_desc : NULL,
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'#description' => t('Juicy details go here...'),
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);
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$form['person']['fav_gummi'] = array(
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'#type' => 'checkbox',
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'#default_value' => isset($node->fav_gummi) ? $node->fav_gummi : 0,
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'#title' => t('Do they like gummi bears?'),
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);
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// Color and number, page 3
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$form['fav_color'] = array(
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'#type' => 'select',
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'#title' => t('Favorite color'),
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'#default_value' => isset($node->fav_color) ? $node->fav_color : 'red',
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'#options' => array('red' => t('Red'), 'green' => t('Green'), 'blue' => t('Blue'), 'yellow' => t('Yellow')),
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);
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$form['fav_number'] = array(
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'#type' => 'textfield',
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'#title' => t('Favorite number'),
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'#default_value' => isset($node->fav_number) ? $node->fav_number : NULL,
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);
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// Movie and tv show, page 4
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$form['fav_movie'] = array(
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'#type' => 'textfield',
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'#title' => t('Favorite movie'),
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'#default_value' => isset($node->fav_movie) ? $node->fav_movie : NULL,
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);
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$form['fav_tv'] = array(
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'#type' => 'radios',
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'#title' => t('How often do you watch your favorite tv show?'),
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'#default_value' => isset($node->fav_tv) ? $node->fav_tv : 'daily',
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'#options' => array('daily' => t('Daily'), 'weekly' => t('Weekly'), 'monthly' => t('Monthly'),),
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);
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// Some markup elements to help the user see what they've already
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// entered. Since the data won't be available until after the form
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// is submitted, we'll only build the basic element here, and then
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// we'll populate it in #pre_render
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$form['person_display'] = array(
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'#type' => 'markup',
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);
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$form['color_number_display'] = array(
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'#type' => 'markup',
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);
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// Add a back button
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$form['back'] = array(
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'#type' => 'button',
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'#value' => t('Back'),
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'#weight' => 35,
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);
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return $form;
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}
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/**
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* Implementation of hook_form_alter(). Here, we set up the 'page' field,
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* which keeps track of what stage the form is in.
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*/
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function multipage_form_example_form_alter($form_id, &$form) {
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// Make sure it's our multipage form.
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if ($form_id == 'multipage_form_example_node_form') {
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// Determine which page of the multipage form we're on. We don't do
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// any incrementing here - that's something that our #pre_render'er
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// will do when this page of the form has successfully validated.
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$form['page'] = array('#type' => 'hidden', '#value' =>
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isset($_POST['edit']['page']) ? $_POST['edit']['page'] : 1);
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// If back button is pressed, back up the form stage, Also, if preview
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// is hit we need to decrement the counter here to keep us on the same page.
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if ($_POST['op'] == t('Back') || $_POST['op'] == t('Preview')) {$form['page']['#value']--;}
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// This modifies the form for validation purposes. once validation is
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// completed, it'll be called one more time (through Drupal's Form API)
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// at which point it'll advance the form to the next page.
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multipage_form_example_pre_render($form_id, $form, FALSE);
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// Here we're augmenting the regular node form validation/submission with
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// some of our own. Note that these are inside the conditional check for
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// this particular form.
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$form['#validate'] = array_merge($form['#validate'], array('multipage_form_example_validate' => array()));
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$form['#submit'] = array_merge($form['#submit'], array('multipage_form_example_submit' => array()));
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}
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return $form;
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}
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/**
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* Validate our form.
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*/
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function multipage_form_example_validate() {
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global $form_values;
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// validate our number, but don't bother if the back button was hit
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if (($form_values['page'] == 3 ) && !is_numeric($form_values['fav_number']) && ($_POST['op'] != t('Back'))) {
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form_set_error('fav_number', t('Favorite number is a <em>number</em>, dummy!'));
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}
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}
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/**
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* The #pre_render of a form allows us to make changes AFTER validation (unlike
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* hook_form_alter()), but BEFORE the form has actually been displayed. We use
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* it to control which form elements are shown, which are hidden, and which values
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* to set based on validate elements, not $_POST. This is a necessity for our
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* complicated multipage example form.
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*/
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function multipage_form_example_pre_render($form_id, &$form, $next_page = TRUE) {
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global $form_values;
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// Make sure it's our multipage form.
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if ($form_id == 'multipage_form_example_node_form') {
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// Are we ready for the next page in our form?
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if ($next_page && isset($_POST['edit']['page']) && ($_POST['op'] != t('Back'))) {
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$form['page']['#value'] = $form['page']['#value'] + 1;
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}
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// Validation errors? Show previous page for correcting.
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if (form_get_errors()) { $form['page']['#value']--; }
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// Modify the #required/#type values depending on our current page.
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// The arrays tell us the pages the changes should take place in.
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// Title/body, stage 1
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$form['title']['#type'] = in_array($form['page']['#value'], array(1)) ? 'textfield' : 'hidden';
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$form['title']['#required'] = in_array($form['page']['#value'], array(1)) ? 1 : 0;
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$form['body']['#type'] = in_array($form['page']['#value'], array(1)) ? 'textarea' : 'hidden';
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// Person, stage 2
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$form['person']['#type'] = in_array($form['page']['#value'], array(2)) ? 'fieldset' : NULL;
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$form['person']['fav_person']['#type'] = in_array($form['page']['#value'], array(2)) ? 'textfield' : 'hidden';
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$form['person']['fav_person']['#required'] = in_array($form['page']['#value'], array(2)) ? 1 : 0;
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$form['person']['fav_person_desc']['#type'] = in_array($form['page']['#value'], array(2)) ? 'textarea' : 'hidden';
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$form['person']['fav_person_desc']['#required'] = in_array($form['page']['#value'], array(2)) ? 1 : 0;
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$form['person']['fav_gummi']['#type'] = in_array($form['page']['#value'], array(2)) ? 'checkbox' : 'hidden';
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// Color and number, page 3
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$form['fav_color']['#type'] = in_array($form['page']['#value'], array(3)) ? 'select' : 'hidden';
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$form['fav_color']['#required'] = in_array($form['page']['#value'], array(3)) ? 1 : 0;
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$form['fav_number']['#type'] = in_array($form['page']['#value'], array(3)) ? 'textfield' : 'hidden';
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$form['fav_number']['#required'] = in_array($form['page']['#value'], array(3)) ? 1 : 0;
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// Movie and tv show, page 4
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$form['fav_movie']['#type'] = in_array($form['page']['#value'], array(4)) ? 'textfield' : 'hidden';
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$form['fav_movie']['#required'] = in_array($form['page']['#value'], array(4)) ? 1 : 0;
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// this bit of trickery is because radios is a bit of a special case -- it's an 'expanding' form element,
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// which means that the multiple buttons get built by form_builder. Because the building for display actually
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// happens when the form is still set to stage 3, we have to build it as a radios type in stage 3, or nothing will
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// display on stage 4! form_hide_elements is a little helper function that recurses through and hides
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// all of the buttons we built if we don't actually happen to be displaying stage 4. whew!
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$form['fav_tv']['#type'] = in_array($form['page']['#value'], array(4)) ? 'radios' : ($next_page ? hide_form_elements($form['fav_tv']) : 'radios');
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$form['fav_tv']['#required'] = in_array($form['page']['#value'], array(4)) ? 1 : 0;
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// The progress display for stuff we've already entered
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$person_display = t('Your favorite person is %person, and they %like gummi bears.<br \>', array('%person' => check_plain($form_values['fav_person']), '%like' => ($form_values['fav_gummi'] ? t('like') : t('don\'t like'))));
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$color_number_display = t('Your favorite color is %color, and your favorite number is %number.', array('%color' => check_plain($form_values['fav_color']), '%number' => check_plain($form_values['fav_number'])));
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$form['person_display']['#value'] = in_array($form['page']['#value'], array(3,4)) ? $person_display : '';
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$form['color_number_display']['#value'] = in_array($form['page']['#value'], array(4)) ? $color_number_display : '';
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// Buttons -- like radios, they need to be properly built in the previous stage, so here we also do the switches at
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// the last chance we have. Notice that the type gets set to 'value' and not 'hidden', b/c hidden will screw w/
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// $_POST['op']
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if ($next_page) {
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$form['back']['#type'] = in_array($form['page']['#value'], array(2,3,4)) ? 'button' : 'value';
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$form['preview']['#type'] = in_array($form['page']['#value'], array(4)) ? 'button' : 'value';
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$form['submit']['#type'] = in_array($form['page']['#value'], array(4)) ? 'submit' : 'button';
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$submit_text = array(NULL, t('Next (person)'), t('Next (color/number)'), t('Next (tv/movie)'), t('Submit'));
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$form['submit']['#value'] = $submit_text[$form['page']['#value']];
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}
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}
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}
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// Handles form submission. We're just throwing our data into the variable
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// table to keep things simple
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function multipage_form_example_submit() {
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global $form_values;
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foreach ($form_values as $key => $value) {
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if (in_array($key, array('fav_person', 'fav_person_desc', 'fav_gummi', 'fav_color', 'fav_number', 'fav_movie', 'fav_tv',))) {
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$array[$key] = $value;
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| 295 |
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}
|
| 296 |
|
|
}
|
| 297 |
|
|
variable_set('multipage_form_example_'. $form_values['nid'], $array);
|
| 298 |
|
|
}
|
| 299 |
|
|
|
| 300 |
|
|
/**
|
| 301 |
|
|
* Implementation of hook_load().
|
| 302 |
|
|
*
|
| 303 |
|
|
* Now that we've defined how to manage the node data in the database, We
|
| 304 |
|
|
* need to tell Drupal how to get the node back out. This hook is called
|
| 305 |
|
|
* every time a node is loaded, and allows us to do some loading of our own.
|
| 306 |
|
|
*/
|
| 307 |
|
|
function multipage_form_example_load($node) {
|
| 308 |
|
|
$additions = variable_get('multipage_form_example_'. $node->nid, NULL);
|
| 309 |
|
|
$additions = (object) $additions;
|
| 310 |
|
|
return $additions;
|
| 311 |
|
|
}
|
| 312 |
|
|
|
| 313 |
|
|
/**
|
| 314 |
|
|
* Implementation of hook_delete().
|
| 315 |
|
|
*
|
| 316 |
|
|
* Clean up our data in variable table.
|
| 317 |
|
|
*/
|
| 318 |
|
|
function multipage_form_example_delete($node) {
|
| 319 |
|
|
// Notice that we're matching all revision, by using the node's nid.
|
| 320 |
|
|
variable_del('multipage_form_example_'. $node->nid);
|
| 321 |
|
|
}
|
| 322 |
|
|
|
| 323 |
|
|
/**
|
| 324 |
|
|
* Implementation of hook_view().
|
| 325 |
|
|
*
|
| 326 |
|
|
* This is a typical implementation that simply runs the node text through
|
| 327 |
|
|
* the output filters.
|
| 328 |
|
|
*/
|
| 329 |
|
|
function multipage_form_example_view(&$node, $teaser = FALSE, $page = FALSE) {
|
| 330 |
|
|
$node = node_prepare($node, $teaser);
|
| 331 |
|
|
$favorites = theme('multipage_form_example', $node);
|
| 332 |
|
|
$node->body .= $favorites;
|
| 333 |
|
|
$node->teaser .= $favorites;
|
| 334 |
|
|
}
|
| 335 |
|
|
|
| 336 |
|
|
/**
|
| 337 |
|
|
* A custom theme function.
|
| 338 |
|
|
*
|
| 339 |
|
|
* By using this function to format our node-specific information, themes
|
| 340 |
|
|
* can override this presentation if they wish. We also wrap the default
|
| 341 |
|
|
* presentation in a CSS class that is prefixed by the module name. This
|
| 342 |
|
|
* way, style sheets can modify the output without requiring theme code.
|
| 343 |
|
|
*/
|
| 344 |
|
|
function theme_multipage_form_example($node) {
|
| 345 |
|
|
|
| 346 |
|
|
$person_display = t('Your favorite person is %person, and they %like gummi bears. <br \>', array('%person' => check_plain($node->fav_person), '%like' => ($node->fav_gummi ? t('like') : t('don\'t like'))));
|
| 347 |
|
|
$color_number_display = t('Your favorite color is %color, and your favorite number is %number. <br \>', array('%color' => check_plain($node->fav_color), '%number' => check_plain($node->fav_number)));
|
| 348 |
|
|
$tv_movie_display = t('Your favorite movie is %movie, and you watch your favorite tv show %watch.', array('%movie' => check_plain($node->fav_movie), '%watch' => check_plain($node->fav_tv)));
|
| 349 |
|
|
|
| 350 |
|
|
$output = '<div class="multipage_form_example">';
|
| 351 |
|
|
$output .= $person_display . $color_number_display . $tv_movie_display;
|
| 352 |
|
|
$output .= '</div>';
|
| 353 |
|
|
return $output;
|
| 354 |
|
|
}
|
| 355 |
|
|
|
| 356 |
|
|
/**
|
| 357 |
|
|
* A little helper function to hide the child elements of 'radios'.
|
| 358 |
|
|
*/
|
| 359 |
|
|
function hide_form_elements(&$element) {
|
| 360 |
|
|
foreach (element_children($element) as $key) {
|
| 361 |
|
|
$element[$key]['#type'] = 'hidden';
|
| 362 |
|
|
}
|
| 363 |
|
|
return 'hidden';
|
| 364 |
|
|
}
|
| 365 |
|
|
|
| 366 |
|
|
/**
|
| 367 |
|
|
* Playing around here with a new form element to enable storing hidden values in an array fashion.
|
| 368 |
|
|
* Seems to work fine. Check out $form['test_hidden_array'] above for how to structure the form
|
| 369 |
|
|
* element
|
| 370 |
|
|
*/
|
| 371 |
|
|
function multipage_form_example_elements() {
|
| 372 |
|
|
$type['hidden_array'] = array('#input' => TRUE, '#process' => array('expand_hidden_array' => array()), '#tree' => TRUE);
|
| 373 |
|
|
return $type;
|
| 374 |
|
|
}
|
| 375 |
|
|
|
| 376 |
|
|
function expand_hidden_array($element) {
|
| 377 |
|
|
$values = is_array($element['#values']) ? $element['#values'] : array();
|
| 378 |
|
|
$element['#tree'] = TRUE;
|
| 379 |
|
|
foreach ($values as $key => $value) {
|
| 380 |
|
|
$element[$key] = array('#type' => 'hidden', '#processed' => TRUE, '#value' => $value);
|
| 381 |
|
|
}
|
| 382 |
|
|
return $element;
|
| 383 |
|
|
}
|
| 384 |
|
|
|
| 385 |
|
|
function theme_hidden_array ($element) {
|
| 386 |
|
|
return $element['#children'];
|
| 387 |
|
|
}
|
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