Drupal, what's the best way to make a huge form - forms

Question

I have to make a huge form in a drupal website, it's for a travel agency and it's a satisfaction questionnaire.
At the beggining of the form the user choose the type of travel he do, and after this all the fields depend of the first answer, for each type of travel there is different fields to complete.
So my question is what's the best way to do this form (there is 12 type of travel, so 12 different set of fields (~50 field / type)).
I think webform could be usable with the webform conditionnal fields, but the problem I think i'll have with webform is when I want to export the data, in the CSV I'll have ALL the fields of ALL the travel type, and this will be illisible.
I search for it but doesn't find if this is possible to hide fields of the csv programmatically.
A second way I found in internet is the CCK, but I have no experience with this.
Do you have any suggestion ?

Answer 1

you can use hook provided by webform module :
/**
* Alter a Webform submission's data when exported.
*/
function hook_webform_csv_data_alter(&$data, $component, $submission) {
// If a value of a field was left blank, use the value from another
// field.
if ($component['cid'] == 1 && empty($data)) {
$data = $submission->data[2]['value'][0];
}
}
Found in webform.api.php into webform module folder
Also you can modify submit function by own altering form process :
function hook_form_alter(&$form, &$form_state , $form_id){
if ($form_id == 'myformid'){
$form['#submit']= array('mycustomsubmit'); // or loop on existing to suppress only unwanted submit callbacks
}
}
function mycustomsubmit($form , &$form_state){
// do your stuffs csv exports
}