hello every one...

i have code like this: 

    <script language="javacsript" type="text/javascript">
  
    function DisplayConfirmation()
    {
 var text = document.getElementById('<%=textbox1.ClientID%>').value;

      if(confirm('your money is'+text+' are u want to send it?'))
      {
               document.getElementById('<%=HiddenField1.ClientID%>').value = "true"
      }
      else
      {
        document.getElementById("<%=HiddenField1.ClientID%>").value = 'false'
      }
     
    }
    </script>
 

it can display msgbox with value textbox1..

but if i want to take value of label in gridview, how to put the label value from gridview to javascript?

my code like that:

  var text = document.getElementById('<%=formview1.findcontrol("costLabel").ClientID%>').value;

but it's error "Object reference not set to an instance of an object."

my formview data:

<asp:FormView ID="FormView1" runat="server" DataSourceID="SqlDataSource4">
            <ItemTemplate>
                harga:
                <asp:Label ID="costLabel" runat="server" Text='<%# Bind("cost") %>'></asp:Label><br />
                no_order:
                <asp:Label ID="no_orderLabel" runat="server" Text='<%# Bind("no_order") %>'></asp:Label><br />
                <asp:Button CommandName="clicke" EnableTheming="True" ID="Button1"  runat="server" Text="click me" OnClick="Button1_Click1"  />
                <asp:Label ID="Label1" runat="server"></asp:Label>
            </ItemTemplate>
        </asp:FormView>

what should i change it?

thx...