How to change Webform field value after a webform has been submitted

Question

I have a webform with a hidden field having a default value of No. How do I change this value to Yes after a webform has been submitted using Rule? I'm using Drupal 7.x. Thank you.

Answer 1

You should make a custom module, rather than using Rules.

Your module will implement the hook_webform_submission_presave, as shown also in webform.api.php inside webform directory.

Your function should look like this (well, this could be your entire .module file):

function mymodule_webform_submission_presave($node, &$submission) {
  $component_id = 3; //that's your hidden field
  $submission->data[$component_id]['value'][0] = 'Yes';
}

Making a custom module is very easy, take a look here.