Javascript to set field required - error

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  I have an onChange jscript on the opportunity form that is not working. When I choose combinations of that would set field required nothing happens, when i choose requesttype to be blank i receive error debugging: script5007: unable to get value of the property 'text'; object is null or undefined. 

  function setRequire() {
  
      var type = Xrm.Page.getAttribute('new_opportunitytype').getSelectedOption().text;
      var requesttype = Xrm.Page.getAttribute('orbus_requesttype').getSelectedOption().text;
      if (type == "Standard / Stock Items" && requesttype == "Rendering Only") 
    {
  
          Xrm.Page.getAttribute("orbus_endclientname").setRequiredLevel("required");
      }
  
      if (type == "Custom " && requesttype != null) 
   {
          Xrm.Page.getAttribute("orbus_endclientname").setRequiredLevel("required");
  
      }
      else if (type == "Rental " && requesttype != null) 
   {
          Xrm.Page.getAttribute("orbus_endclientname").setRequiredLevel("required");
  
      }
      else if (type == "Systems" && requesttype != null) 
   {
          Xrm.Page.getAttribute("orbus_endclientname").setRequiredLevel("required");
  
      }
         
  
  
   }
  

  Monday, December 8, 2014 4:09 PM