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row filter


what is the error in this code

error show object doesn't support this property or method


<script language="javascript" type="text/javascript" src="scripts/dhtmlXCommon.js"></script>
<script language="javascript" type="text/javascript" src="scripts/dhtmlxgrid.js"></script>
<script language="javascript" type="text/javascript" src="scripts/dhtmlxgridcell.js"></script>
<script language="javascript" type="text/javascript" src="scripts/dhtmlXDataProcessor.js"></script>
<script language="javascript" type="text/javascript" src="scripts/dhtmlxgrid_excell_sub_row.js"></script>
<script language="javascript" type="text/javascript" src="scripts/CommonScript.js"></script>
<script language="javascript" type="text/javascript" src="Scripts/dhtmlxgrid_filter.js"></script>



<div id="left123" style="float:left; width:275px"> Itenary Code :
<input type="text" id="txtitinerarycode" />
<br />
itenary Name :<span>
<input type="text" id="txtitineraryname" /> </span>

</div>


<script>
mygrid = new dhtmlXGridObject('gridbox');
var _js_prefix="../scripts/";
mygrid.setSkin("xp");
mygrid.init();
mygrid.enableAutoHeight(true);
mygrid.enableAutoWidth(true);//SearchItinerary
mygrid.imgURL=locationpath+'/Images/imgs/';
         mygrid.loadXML(locationpath+"/LoadData.aspx?ICode=All&PageName=SearchItinerary" +'&Mode='+strSaveMethod);
        
myDataProcessor = new dataProcessor(locationpath+"/SaveData.aspx?ICode="+reportId+"&PageName=Media");
    
    
     // mygrid.setOnRowDblClickedHandler(doOndblClick);
     myDataProcessor.setVerificator(1)
     myDataProcessor.setVerificator(3,checkIfNotZero)
     myDataProcessor.setUpdateMode("off");//available values: cell (default), row, off
     //mygrid.setOnKeyPressed(onKeyPressed);
     mygrid.setOnRowDblClickedHandler(doOndblClick);
     myDataProcessor.init(mygrid);


function doFilter(){
var _stritcode=document.getElementById("txtitinerarycode").value;

var _stritname=document.getElementById("txtitineraryname").value
if(_stritcode.length>1)
{
alert(_stritcode);
        mygrid.filterBy(1,document.getElementById("txtitinerarycode").value);
     }
     else if(_stritname.length>1)
     {
            
            mygrid.filterBy(1,document.getElementById("txtitineraryname").value);
            }
        }