Problem- Dropdown requires a hidden click if it has a JS validation attahced

Note : Below problem is both in AJAX & Non-AJAX

 

Let say you have a drop down. You have a JS attached with it.

 

// ------------------------------------------------------------------------------------------------------------------------

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" CausesValidation="True" onchange="return Validate();" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">

            <asp:ListItem>aa</asp:ListItem>

            <asp:ListItem>bb</asp:ListItem>

            <asp:ListItem>cc</asp:ListItem>

        </asp:DropDownList>

       

 <asp:Button ID="Button1" runat="server" Text="" OnClick="Button1_Click" Visible="True" />  // Will be hidden button

// ------------------------------------------------------------------------------------------------------------------------

 

// ------------------------------------------------------------------------------------------------------------------------

<script  type="text/javascript">

 

              function Validate()

    {

 

       num = 6;  // Here, could be any compelx logic.

       if(num > 5)

            return true; 

     else

        return false;

    }

 

</script>

// ------------------------------------------------------------------------------------------------------------------------

 

 

What is wrong:

 

            When you change some selection in dropdown, then JavaScript fires and returns ‘ true’. Now though it returns ‘true’ the Server side event does not fires.

            Hence you need to change the script as below.

 

              function Validate()

    {

      num = 6;  // Here, could be any compelx logic.

       if(num > 5)

            {

         // return true;  // Comment it.

 

        var hiddenButton=document.getElementById('<%= Button1.ClientID %>');

        hiddenButton.click();

}

     else

        return false;

    }

 

</script>

 

Solution Required:

 

            Need some good Solution. Please help.

 

 

Thanks & Regards,

Arun Manglick

SMTS || Microsoft Technology Practice || Bridgestone - Tyre Link || Persistent Systems || 3023-6258

 

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