Question Drupal 7: Meilleures pratiques pour une liste de sélection dynamique dans Drupal 7


Quelle est la meilleure pratique pour une liste de sélection dynamique dans Drupal 7?

  1. Créez un champ avec des options factices via l'interface utilisateur et en remplaçant les options par hook_form_FORM_ID_alter

ou

  1. Créer une liste de sélection dynamique à partir de zéro via un module personnalisé avec le hook_form

ou

  1. une approche différente?

Merci


11
2018-03-01 18:31


origine


Réponses:


Vous pouvez utiliser les API de formulaire #ajax (il s'appelait autrefois #ahah dans Drupal6) pour le faire.

Voici un exemple pour Drupal 7 (basé sur Exemples pour les développeurs) qui affiche deux listes déroulantes où la première liste déroulante modifie la liste des options de la deuxième liste déroulante:

Source de fichier mymodule.module:

<?php

/**
 * Implementation of hook_menu().
 * Registers a form-based page that you can access at "http://localhost/mypage"
 */
function mymodule_menu(){
    return array(
        'mypage' => array(
            'title' => 'A page to test ajax',
            'page callback' => 'drupal_get_form',
            'page arguments' => array('mymodule_page'),
            'access arguments' => array('access content'), 
        )
    );
}



/**
 * A form with a dropdown whose options are dependent on a
 * choice made in a previous dropdown.
 *
 * On changing the first dropdown, the options in the second are updated.
 */
function mymodule_page($form, &$form_state) {
    // Get the list of options to populate the first dropdown.
    $options_first = mymodule_first_dropdown_options();

    // If we have a value for the first dropdown from $form_state['values'] we use
    // this both as the default value for the first dropdown and also as a
    // parameter to pass to the function that retrieves the options for the
    // second dropdown.
    $value_dropdown_first = isset($form_state['values']['dropdown_first']) ? $form_state['values']['dropdown_first'] : key($options_first);

    $form['dropdown_first'] = array(
        '#type' => 'select',
        '#title' => 'First Dropdown',
        '#options' => $options_first,
        '#default_value' => $value_dropdown_first,

        // Bind an ajax callback to the change event (which is the default for the
        // select form type) of the first dropdown. It will replace the second
        // dropdown when rebuilt
        '#ajax' => array(
            // When 'event' occurs, Drupal will perform an ajax request in the
            // background. Usually the default value is sufficient (eg. change for
            // select elements), but valid values include any jQuery event,
            // most notably 'mousedown', 'blur', and 'submit'.
            'event' => 'change',
            'callback' => 'mymodule_ajax_callback',
            'wrapper' => 'dropdown_second_replace',
        ),
    );
    $form['dropdown_second'] = array(
        '#type' => 'select',
        '#title' => 'Second Dropdown',
        // The entire enclosing div created here gets replaced when dropdown_first
        // is changed.
        '#prefix' => '<div id="dropdown_second_replace">',
        '#suffix' => '</div>',
        // when the form is rebuilt during ajax processing, the $value_dropdown_first variable
        // will now have the new value and so the options will change
        '#options' => mymodule_second_dropdown_options($value_dropdown_first),
        '#default_value' => isset($form_state['values']['dropdown_second']) ? $form_state['values']['dropdown_second'] : '',
    );
    return $form;
}

/**
 * Selects just the second dropdown to be returned for re-rendering
 *
 * Since the controlling logic for populating the form is in the form builder
 * function, all we do here is select the element and return it to be updated.
 *
 * @return renderable array (the second dropdown)
 */
function mymodule_ajax_callback($form, $form_state) {
    return $form['dropdown_second'];
}


/**
 * Helper function to populate the first dropdown. This would normally be
 * pulling data from the database.
 *
 * @return array of options
 */
function mymodule_first_dropdown_options() {
    return array(
        'colors' => 'Names of colors',
        'cities' => 'Names of cities',
        'animals' => 'Names of animals',
    );
}


/**
 * Helper function to populate the second dropdown. This would normally be
 * pulling data from the database.
 *
 * @param key. This will determine which set of options is returned.
 *
 * @return array of options
 */
function mymodule_second_dropdown_options($key = '') {
    $options = array(
        'colors' => array(
            'red' => 'Red',
            'green' => 'Green',
            'blue' => 'Blue'
        ),
        'cities' => array(
            'paris' => 'Paris, France',
            'tokyo' => 'Tokyo, Japan',
            'newyork' => 'New York, US'
        ),
        'animals' => array(
            'dog' => 'Dog',
            'cat' => 'Cat',
            'bird' => 'Bird'
        ),  
    );
    if (isset($options[$key])) {
        return $options[$key];
    }
    else {
        return array();
    }
}

22
2018-03-01 18:57



Le rappel pour la réponse de wildpeaks devrait être:

function mymodule_ajax_callback($form, $form_state) {
    return render($form['dropdown_second']);
}

0
2017-07-10 05:12