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   2. drupal7 system.api.php

Provide a form-specific alteration instead of the global hook_form_alter().

Modules can implement hook_form_FORM_ID_alter() to modify a specific form, rather than implementing hook_form_alter() and checking the form ID, or using long switch statements to alter multiple forms.

Note that this hook fires before hook_form_alter(). Therefore all implementations of hook_form_FORM_ID_alter() will run before all implementations of hook_form_alter(), regardless of the module order.

Übergabeparameter

$form Nested array of form elements that comprise the form. The arguments that drupal_get_form() was originally called with are available in the array $form['#parameters'].

$form_state A keyed array containing the current state of the form.

See also

hook_form_alter()

drupal_prepare_form()

Verwandte Themen

Hooks

Allow modules to interact with the Drupal core.

Code

developer-docs/hooks/core.php, line 795

<?php
function hook_form_FORM_ID_alter(&$form, &$form_state) {
  // Modification for the form with the given form ID goes here. For example, if
  // FORM_ID is "user_register" this code would run only on the user
  // registration form.

  // Add a checkbox to registration form about agreeing to terms of use.
  $form['terms_of_use'] = array(
    '#type' => 'checkbox',
    '#title' => t("I agree with the website's terms and conditions."),
    '#required' => TRUE,
  );
}
?>