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Posted By

berkes on 02/18/10


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forms drupal api FAPI formalter drupal5


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Howto run your own functions on any forms submission.

 / Published in: PHP
 

URL: http://wizzlern.nl

By using hookformalter, you can add your own callback functions to any Drupal form. These functions will be called when Drupal validates the form and when Drupal submits it.

In example below, a module called 'simplecheckout' adds its own handlers to a form called 'idealpaymentapiissuer_form'. That latter is generated by another module, but we can fill our own tables and run our own validation *in addition to those by the originating module*.

Expand | Embed | Plain Text 
  1. /**
  2.  * Implementation of hook_form_alter().
  3.  */
  4. function simple_checkout_form_alter($form_id, &$form) {
  5.   switch($form_id) {
  6.     case 'ideal_payment_api_issuer_form':
  7.       // Add a submit handler.
  8.       // NOTE: we do not override the #submit array, but ADD our own to the array. That way we do not break existing submit-handlers!
  9.       $form['#submit']['simple_checkout_order_submit'] = array();
  10.       // Add a validate handler.
  11.       $form['#validate']['simple_checkout_order_validate'] = array();
  12.       break;
  13.   }
  14. }
  15.  
  16. // ... A lot of code ...
  17.  
  18. /** 
  19.  * Fapi callback added in form_alter: validates the orders to our orders table.
  20.  *
  21.  * @param $form_id
  22.  *   Description of param $form_id
  23.  * @param $form_values
  24.  *   Description of param $form_values
  25.  *
  26.  * @return
  27.  *   Nothing.
  28.  */
  29. function simple_checkout_order_validate($form_id, &$form_values) {
  30.   // @TODO: prepare $order and insert into our DB table.
  31. }
  32.  
  33. /** 
  34.  * Fapi callback added in form_alter: submits the orders to our orders table.
  35.  *
  36.  * @param $form_id
  37.  *   Description of param $form_id
  38.  * @param $form_values
  39.  *   Description of param $form_values
  40.  *
  41.  * @return
  42.  *   Nothing.
  43.  */
  44. function simple_checkout_order_submit($form_id, &$form_values) {
  45.   // @TODO: prepare $order and insert into our DB table.
  46. }

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