Replace Zendesk ticket type with a custom field. It also sets the system ticket type in the background

zendesk-ticket-type.js

//Replaces the Zendesk system ticket type with a custom field. 

$j(document).ready(function() { 
   //the custom  field ID 
   var customfield = "20111118";
   //check to see if you are on the agent ticket page
   if(window.location.href.indexOf('tickets') >= 0) {
     //hide the custom field label and the system ticket type
       $j('select#ticket_fields_'+ customfield).prev().toggle();
       $j('select#ticket_ticket_type_id').toggle();
     //Get the current selection of the custom field 
       var userSelection = $j('select#ticket_fields_'+ customfield +' option:selected').text();
    //If the selection is Task how the Date field
       if(userSelection ==! 'Task') { $j('#ticket_date.select').hide(); }
    //If the selection is a Incident show the problem drop down field 
       if(userSelection ==! 'Incident')  { $j('#ticket_link.select').hide(); }
    //place the custom field where the system ticket ID field was
      $j('#ticket_ticket_type_id').after($j('select#ticket_fields_'+ customfield));

      //monitor the dropdown field
      $j('select#ticket_fields_'+ customfield).change(function(endUserselect){
          //grab the value of the dropdown
         userSelection = $j('select#ticket_fields_'+ customfield +' option:selected').text();

          //show and hide the correct fields. Also set the ticke type ID in the background 
          if(userSelection === 'Task'){
               $j('#ticket_link.select').hide();
               $j('#ticket_date.select').toggle();
               $j('select#ticket_ticket_type_id').val('4');
              }
          //hide them again if the user changes his mind
          else if (userSelection === 'Story') {
              $j('#ticket_date.select').hide();
               $j('#ticket_link.select').hide();
               $j('select#ticket_ticket_type_id').val('1');
             }
          else if (userSelection === 'Epic') {
              $j('#ticket_date.select').hide();
               $j('#ticket_link.select').hide()
               $j('select#ticket_ticket_type_id').val('1');
             }
          else if (userSelection === 'Question') {
              $j('#ticket_date.select').hide();
               $j('#ticket_link.select').hide();
               $j('select#ticket_ticket_type_id').val('1');
             }
           else if (userSelection === 'Problem') {
              $j('#ticket_date.select').hide();
                $j('#ticket_link.select').hide();
               $j('select#ticket_ticket_type_id').val('3');
             }
           else if(userSelection === 'Incident') {
              $j('#ticket_date.select').hide();
               $j('#ticket_link.select').toggle();
               $j('select#ticket_ticket_type_id').val('2');
             }
         });

   }
});