ASP.NET: ModalPopupExtender prevents button click event from firing

Here is what I’m trying to do: Click a button on my page, which in turn makes (2) things happen:

1. Display a ModalPopup to prevent the user from pressing any buttons or changing values
2. Call my code behind method, hiding the ModalPopup when finished

Here is the ASP markup:

<asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="true"
    UpdateMode="Always">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="btnSaveData" EventName="Click" />
    </Triggers>
    <ContentTemplate>
        <asp:Panel ID="pnlHidden" runat="server" style="display: none;">
            <div>
            <h1>Saving...</h1>
            </div>
        </asp:Panel>
        <cc1:ModalPopupExtender ID="modalPopup"
            BackgroundCssClass="modalBackground" runat="server"
            TargetControlID="btnSaveData" PopupControlID="pnlHidden"
            BehaviorID="ShowModal">
        </cc1:ModalPopupExtender>
        <asp:Button ID="btnSaveData" runat="server" Text="Save Data"
            OnClick="btnSaveData_Click" />
    </ContentTemplate>
</asp:UpdatePanel>

Now, here is my code behind C# code:

protected void btnSaveData_Click(object sender, EventArgs e)
{
   UpdateUserData(GetLoggedInUser());
   modalPopup.Enabled = false;
}

Why doesn’t this work? The ModalPopup displays perfectly, but the btnSaveData_Click event NEVER fires.

UPDATE: The first suggestion did not work for me. I also tried your second suggestion (insofar as it applied to me). One minor difference on my end is that there is no button on my modal panel (pnlHidden) — it’s just a message. I did try using Javascript events on the client side, which at least did fire concurrently with my server-side event. This was good news, but I can’t seem to find or grab a handle on the ModalPopupExtender or its BehaviorID. This doesn’t work:

function showOverlay() {
    var popup = $find('modalPopup');
    popup.show();
}

popup is ALWAYS equal to null.

FINAL UPDATE: This is my final solution for getting this to work (Take specific note of the use of OnClientClick AND OnClick):

<asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="true"
UpdateMode="Always">
<Triggers>
    <asp:AsyncPostBackTrigger ControlID="btnSaveData" EventName="Click" />
</Triggers>
<ContentTemplate>
    <asp:Panel ID="pnlHidden" runat="server" style="display: none;">
        <div>
        <h1>Saving...</h1>
        </div>
    </asp:Panel>
    <cc1:ModalPopupExtender ID="modalPopup"
        BackgroundCssClass="modalBackground" runat="server"
        TargetControlID="hdnField" PopupControlID="pnlHidden"
        BehaviorID="ShowModal">
    <asp:HiddenField ID="hdnField" runat="server" />
    </cc1:ModalPopupExtender>
    <asp:Button ID="btnSaveData" runat="server" Text="Save Data"
        OnClientClick="showModal();" OnClick="btnSaveData_Click" />
    </ContentTemplate>
</asp:UpdatePanel>

Using this Javascript function:

function showModal() { $find('ShowModal').show(); }

… And this code behind:

protected void btnSaveData_Click(object sender, EventArgs e)
{
   UpdateUserData(GetLoggedInUser());
   modalPopup.hide();
}

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

Try this.

Create a dummy hidden field:

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

Set the TargetcontrolID = “hdnField” in your Modal Popup declaration.

In your btnSaveData_Click event, do this:

modalPopup.Show();

Method 2

Try this. It is 100% working

 <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <asp:Button ID="Btnshow" runat="server" Text="Show" OnClick="Btnshow_Click" />
        <asp:Button ID="BtnTarget" runat="server" Text="Target" Style="display: none" />
        <asp:TextBox ID="TextBox1" runat="server">
        </asp:TextBox>
        <input type="button" value="Get" onclick="abc()" />
        <asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="BtnTarget"
            PopupControlID="Panel1">
        </asp:ModalPopupExtender>
        <asp:Panel ID="Panel1" runat="server" BackColor="Black" Width="300px" Height="300px">
            <asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="false" UpdateMode="Conditional">
                <ContentTemplate>
                    <asp:Button ID="BtnHide" runat="server" Text="Hide Button" OnClick="BtnHide_Click" />
                </ContentTemplate>
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="BtnHide" EventName="Click" />
                </Triggers>
            </asp:UpdatePanel>
        </asp:Panel>
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="Btnshow" EventName="Click" />
    </Triggers>
</asp:UpdatePanel>

Server side code

protected void Btnshow_Click(object sender, EventArgs e)
{
    ModalPopupExtender1.Show();
}
protected void BtnHide_Click(object sender, EventArgs e)
{
    ModalPopupExtender1.Hide();
}

Method 3

First attempt: Try to set your ButtonID into OkControlID Tag and try again

OR

Second attempt: Call your event over javascript there seems to be some problems with click events

<div> 
    <cc1:ModalPopupExtender PopupControlID="Panel1"  
         ID="ModalPopupExtender1" 
         runat="server" TargetControlID="LinkButton1" OkControlID="Ok"  
         OnOkScript="__doPostBack('Ok','')"> 
    </cc1:ModalPopupExtender> 
    <asp:LinkButton ID="LinkButton1" runat="server">LinkButton</asp:LinkButton>  
</div>         

<asp:Panel ID="Panel1" runat="server"> 
    <asp:Button ID="Ok" runat="server" Text="Ok" onclick="Ok_Click" />             
</asp:Panel>

Method 4

From this example you can easily control panel show up depends on conditions instead of just immediately show up panel once you click button.

<asp:Button ID="btnAdd" runat="server" OnClick="btnAdd_Click"/>
<asp:HiddenField ID="hdnField" runat="server" />
<ajaxToolkit:ModalPopupExtender runat="server" 
  TargetControlID="hdnField" 
  ID="btnAdd_ModalPopupExtender"
  PopupControlID="pnlPrintName">
</ajaxToolkit:ModalPopupExtender>
<asp:Panel ID="pnlPrintName" runat="server">
.
.
</asp:Panel>

//Server side code:
protected void btnAdd_Click(object sender, EventArgs e)
{
  if( dt.Rows.Count == 0 )
  {
     btnAdd_ModalPopupExtender.Show();
  }
  else
  {
     add();
  }
}

Method 5

In code behind, you can do this:

if (true)
{
    var script = @"Sys.Application.add_load(function() { $find('behavoirIDModal').show(); });";
    ScriptManager.RegisterStartupScript(this, GetType(), "Show", script, true);
}

Change this ‘behavoirIDModal’

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0