Fit retrive odata crm dynamics 2011

I have the following function to call attributes of the contact entity to the test entity in this case, where by comparison of a lookup field, I bring the data that I need, the problem is that the query only serves me for fields of type picklist and not type text.

  

    

function updateContact () {

         

var contactperson = Xrm.Page.getAttribute ("contactperson");

         

var account = contactperson.getValue () [0];

         

var processId = account.id.replace ("{", "") .replace ("}", "");

         

contactperson.addOnChange (function () {

 var select = "emailaddress1, telephone1, MobilePhone"

   var filter = "Accountid eq guid'" + processId + "'";

   $.getJSON(oDataEndpoint + "/ContactSet", { $filter: filter, $select: >>select }, function (data) {
 if (data != null && data.d != null) {
             >>Xrm.Page.getAttribute("emailaddress").setValue(data.d.results[0].emailaddress1);          
         }
     });

         

});     }