Webform 6x 3.11 - custom code to determine value of webform field

Question

I intend to pass a predetermined NodeID into a webform through URL querystring like so:

www.mysite.com/forms/my-form?nid=43

On the webform, one of the field values must be calculated by getting the Node Title based on what the nid is. I want to use a textfield, so that it can be one of the values submitted in the email. Can this be achieved?...because from what I see, the "default value" box only allows for a few tokens and no custom code. Furthermore I don't want to pass in the NodeTitle directly in the querystring for 2 reasons:

1. It will contain spaces and therefore will not be URL encoded, and
2. I want to avoid people tampering with the querysting

Here's hoping some drupal guru can come to my rescue! thanks in advance!

Answer 1

We had exactly the same issue when we were developing a custom job application online form, and we wanted to pass in the job details into the webform in question. How we solved it:

• Created (job application) webform node
• Created links to the webform node above in the form of /apply-online?n=17
• Created custom node-856.tpl.php (856 happened to be the node of the apply online webform) to
  • first validate the nid as a valid job
  • validate that the job is published
  • validate that the job had not closed
  • format the additional fields into the webform such as title, position etc etc
  • stop any URL tampering
• Created a custom webform validation hook to ensure that only published nodes of type 'job' were allowed to ever be submitted (to stop any form tampering)

Sample code for the validation hook:

/**
 *  Implementation of hook_form_alter()
 *  This function is used to add an extra validation function to the apply online webform
 */
function site_profile_form_webform_client_form_856_alter(&$form, &$form_state)  {
  $form['#validate'][] = 'site_profile_validate';
}

/*
 *  Implementation of hook_validate()
 *  Doesn't exactly validate the webform as that's done in another validation function
 *  This takes the nid from the job_url field and turns it into a url.
 */
function site_profile_validate($form, &$form_state) {
  global $base_url;

  $nid = $form_state['values']['submitted']['job_url'];
  $node = node_load($nid);
  $job_url = $base_url . url('node/' . $nid);
  $form_state['values']['submitted']['job_url'] = $job_url;

  //need this to stop the form losing the nid argument in the url
  if (empty($form_state['values']['submitted']['cv']['_fid']) || empty($form_state['values']['submitted']['cover_letter']['_fid']) || empty($form_state['values']['submitted']['completed_application_form']['_fid'])) {
    drupal_goto('apply-online', array('n' => $nid));
  }
}

Sample code for the node-856.tpl.php:

  // job's apply online node ID = 856, this template was made to theme this
  // particular page

  $job_nid = $_GET['n'];
  if (!is_numeric($job_nid)) {
   drupal_access_denied();
   exit;
  }
  $job_node = node_load($job_nid);
  if ($job_node->type != 'job') {
    drupal_access_denied();
    exit;
  }
<div id="node-<?php print $node->nid; ?>" class="node<?php if (!$status) { print ' node-unpublished'; } ?>">

  <h4><?php print t('Job Title'); ?></h4>
  <p><?php print $job_node->title; ?></p>
  <h4><?php print t('Vacancy Number'); ?></h4>
  <p><?php print $job_node->field_number[0]['value']; ?></p>
  <h4><?php print t('Closing Date'); ?></h4>
  <p><?php print $closing_date; ?></p>
  <h4><?php print t('Job Summary'); ?></h4>
  <p><?php print $job_node->teaser; ?></p>

Hope this helps

Answer 2

Here is a short howto I wrote on getting custom code to run with Webform. It details writing a custom module, copying the Webform template to match the nodeID, and adding custom javascript/jquery for form processing.

http://docs.quantact.com/drupal-webform-custom-php-code