GridView Empty Row Validation

Question

4.00/5 (1 vote)

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I need to validate a gridview (ie. is empty or not)
(Gridview data will be filled by user through datatable.)

In my code it is not able to find the Gridview1.
and also advise my code / way is correct..
//=======================================================

XML

<script  language="javascript" type ="text/javascript" >
     function gvPostDatedChequeValidation(source, args)
       {
        var Grid = document.getElementById("<%=GridView1.ClientID%>");
        if (Grid.Rows.Count>0 )
         {
         args.IsValid = true;
         }
         else
         {
         args.IsValid = false;
         }
       }
       </script>

//=============================================================

XML

<asp:GridView ID="GridView1" runat="server">
  </asp:GridView>

  <asp:CustomValidator ID="CustomValidator2" runat="server"  ErrorMessage="Fill Blank Cheque Details"
  ClientValidationFunction="gvPostDatedChequeValidation">*</asp:CustomValidator>

  <asp:Button ID="Button1" runat="server" Text="Button" />

Posted 1-May-11 20:19pm

SHAJANCHERIAN

Updated 17-Jan-21 4:55am

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Ashishmau · Accepted Answer · 2011-05-01T20:24:00

Solution 1

Count property is not valid in javascript
use length property like this

SQL

if (Grid.rows.length>0 )
        {
}

Posted 1-May-11 20:24pm

Ashishmau

Comments

SHAJANCHERIAN 2-May-11 2:44am

Thank You Ashishmau1.
But still there is a problem . ie.
Always getting null in var Grid. My code is given below. Is there any mistake.
var Grid = document.getElementById("<%=GridView1.ClientID%>");

Ashishmau 2-May-11 2:55am

first of all dont use variable Grid as it might predefined.
use any other custom variable and try.

SHAJANCHERIAN 2-May-11 3:16am

Intitialy as there was no rows in the Gridview1, Javascript was unable to find the Gridview.
So I have corrected my code as follows. Now it is working.
//======================================================
function gvPostDatedChequeValidation(source, args)
{
var Grid = document.getElementById("<%=gvPostDatedCheque.ClientID%>");
if (Grid==null )
{
args.IsValid = false;

}
else
{
args.IsValid = true;
}
}