Model popup Extender issue

Question

I am using a model popup extender in my page. I have created some rule. If that rule is true, then show model popup extender otherwise hide it.I am using the below code to display model popub extender.

        <asp:ModalPopupExtender runat="server" ID="modelPopupExtender1" TargetControlID="Lnk_1"
            PopupControlID="pan_addEdit" BackgroundCssClass="modalBackground">
        </asp:ModalPopupExtender>
        <asp:Panel ID="pan_addEdit" runat="server" CssClass="pnl">
            <asp:LinkButton ID="Lnk_1" runat="server" OnClick="btn_generate_Click" Visible="true"></asp:LinkButton>
            <table border="0" width="800px" height="350px">
            .......

My problem is when the rule condition is false, it just shows and disappears in a fraction of second. How can i reduce it.

Answer 1

Since your ModalPopupExtender's TargetID is your LinkButton Id , irrespective of the RULE, it will always show even before that RULE is checked. The solution is to add a HiddenField and pass its ID as TargetID to ModalPopupExtender. This way you can check the RULE when LinkBUtton is clicked and use ModalPopupExtender.Show() to show the popup.

<asp:HiddenField ID="hdnpop" runat="server" />

<asp:ModalPopupExtender runat="server" ID="modelPopupExtender1" TargetControlID="hdnpop"
            PopupControlID="pan_addEdit" BackgroundCssClass="modalBackground">
</asp:ModalPopupExtender>

In LinkButton event,

if(RULE)
{//Do something
    modelPopupExtender1.Show()
}
else
{
   //Do something else an dont Show()
}