title: jqGrid errorTextFormat function
body: <p>I´m developing an application using CodeIgniter and JQuery.
  I have read here <a href="https://stackoverflow.com/questions/8089061/jqgrid-error-message-on-delete">jqgrid error message on delete</a> and here <a href="https://stackoverflow.com/questions/7816119/jqgrid-error-message-from-server-side-exception">jqGrid error message from server side exception</a> some issues about this problem but the fact is that does not work for me. </p>
  
  <p>In my database I have set some business rules in form of index, checks, etc. I need to customize the "error Status: 'error'. Error code: 500" that the jqGrid returns when I have those types of errors.
  I´d appreciate any help. 
  Here is my jquery grid code.</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
      var base_url = 'http://localhost/sp/';
      var site_url = 'http://localhost/sp/index.php';
      var url = '';
  
          $(document).ready(function() {
  
             var grid = jQuery("#newapi_1351019084").jqGrid({
                      ajaxGridOptions : {type:"POST"},
                         jsonReader : {
                         root:"data",
                         repeatitems: false
                     },
                     ondblClickRow: function(id){
                         dtgLoadButton1();
  
                          return;
                         },
                      rowList:[10,20,30],
                      viewrecords: true
                     ,url:'http://localhost/sp/index.php/assigment/getData'
  ,editurl:'http://localhost/sp/index.php/assigment/setData'
  ,datatype:'json'
  ,rowNum:'13'
  ,width:'800'
  ,height:'300'
  ,pager: '#pnewapi_1351019084'
  ,caption:'Control de asignaciones'
  ,colModel:[
  {name:'username',index:'username',label:'Usuario' ,align:'left',width:300,editable:false,edittype:'text',editrules:{required:true}  }
  ,{name:'StoreName',index:'StoreName',label:'Tienda' ,align:'center',width:200,editable:false,edittype:'text',editrules:{required:true}  }
  ,{name:'Users_idUsers',index:'Users_idUsers',label:'Usuario' ,align:'center',width:100,hidden:true,editable:true,edittype:'select',editoptions:{value:":Select;5:tienda1;6:tienda2;17:tienda3;18:tienda11",size:10},editrules:{edithidden:true,required:true,integer:true}  }
  ,{name:'Stores_idStores',index:'Stores_idStores',label:'Tienda' ,align:'center',width:100,hidden:true,editable:true,edittype:'select',editoptions:{value:":Select;1:EA001;3:EA003;4:EA005;5:EA006;6:EA007;7:EA008;8:EA009;9:EA010;10:EA011;11:EA012;12:EA013;13:EA015;14:EA017;15:EA018;16:EA019;17:EA020;18:EA021;19:EA022;20:EA002;21:EA000",size:10},editrules:{edithidden:true,required:true,integer:true}  }
  ,{name:'SurrugateTurn',index:'SurrugateTurn',label:'SurrugateTurn' ,align:'center',width:100,key:true,hidden:true,editable:true,edittype:'select',editoptions:{value:":Select;1:1;3:3;2:2",size:10},editrules:{hidden:true}  }
  ]               })
                jQuery("#newapi_1351019084")
              .jqGrid('navGrid',
              '#pnewapi_1351019084',
              {view:false,
              edit:'1',
              add:'1',
              del:'1',
              close:true,
              delfunc: null ,
              search:''
          },
          { recreateForm: true, 
          width : 400 ,
          beforeShowForm : function(form) {
  
           },
          closeAfterEdit:true }, // edit options
  
          {  recreateForm: true,
          width : 400,
          closeAfterAdd : true,
           beforeSubmit : function(postdata, formid) {
           var mensaje = '';
           var resultado = true;
  
  
  
  
            return[resultado,mensaje]; 
          }
          }, /*add options*/
  
          {mtype: 'POST'} /*delete options*/,
          {sopt: ['eq','cn','ge','le' ] ,     
          multipleSearch: false ,
          showOnLoad : false,
          overlay:false,mtype: 'POST'} /*search options*/
          ).navButtonAdd('#pnewapi_1351019084',
                  { caption:'', buttonicon:'ui-icon-extlink', onClickButton:dtgOpenExportdata, position: 'last', title:'Export data', cursor: 'pointer'}
                  );
  ;
          });
  &lt;/script&gt;
  </code></pre>
  
  <p>Best regards and thanks for your time, </p>