Get selected row values of ajaxdata gridview

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Ajax

Gridview

ASP.NET4

, +

Hi all,
I have a div that displays data retrieved from a web service. And there is in additional button in each row of the grid that allows the user to extract data of this row. The problem is that I don't know how to catch data selected data from AjaxData GridView. I tried this function in javaScript but it is not working:

function extractFunction(sender,e) {
      var index = e.get_row().get_rowIndex();
      var gridView = $find('<%= grdvPriorApproval.ClientID %>');
      var row = gridView._rows[index].findControl('lblClaimhID').value;
     __doPostBack('CustomPostBack', row);
    }

Index value is 0 and row value is null.

This is my ajax GridView:

<div class="modal-body">
   <ajaxdata:gridview id="grdvPriorApproval" runat="server" rowcommandevent="extractFunction">
       <columns>
          <ajaxdata:gridviewtemplatecolumn headertext="ClaimhId" sortfield="ClaimhId" visible="False">
              <edititemtemplate>
                  <asp:TextBox ID="txtClaimhID" runat="server" 
                  Text=<%# Bind("ClaimhId")%>>
              
              <itemtemplate>
                  <asp:Label ClientIDMode="Static" ID="lblClaimhID" runat="server" 
                   Text=<%# Bind("ClaimhId") %>>
              
          
          <ajaxdata:gridviewcommandcolumn controlstyle-font-bold="true" controlstyle-forecolor="#f2fae5" controlstyle-backcolor="#6c9815" buttontype="Button" selecttext="Extract" showselectbutton="True">
          
       
     
</div>

What I have tried:

I tried to change my grid now to telegrid, but I could not fill data from my webservice in in gridview. So I prefer to use ajaxData.