ASPX server-side function call after client-side user confirmation?

Question

Maybe I'm searching with the wrong keywords, but I can't find a solution to this.

I've got an ASPX page on which, within an <asp:Repeater> I want to insert a button (per item) that will:

1. ask (JS "confirm") the user if they really want to proceed, then
2. call a method on the page class passing in the ID (Guid) from that item.

I can do 1 or 2, but can't figure out how to call back into the page method from JavaScript.

I've tried turning on the EnablePageMethods in the ScriptManager, but that didn't seem to do what I expected -- calling PageMethods.Blah(...) did not seem to have any effect.

Are there any ready examples? In fact, the confirmation string is the same for every entry.

AtDhVaAnNkCsE

Answer 1

You can perform the confirmation with the OnClientClick property of your button:

<asp:Button runat="server" ID="DeleteButton" CommandName="Delete"
 Text="Delete" OnClientClick="return confirm('Are you sure ?');" />

Answer 2

here's what you need to do:

1. make sure your button has runat="server"
2. in that button, add onClientClick="javascript:return confirm('Are you sure?');"

3. call your SERVER SIDE code from onClick even of the button

   <asp:Button id="Button1" Text="Do Stuff" OnClick="YOUR SERVER SIDE METHOD"    
     onClientClick="javascript: return confirm('Are you sure?');" runat="server"/>
   

Answer 3

<asp:Repeater ID="YourRepeater" runat="server">
    <ItemTemplate>
     <asp:Button ID="btnDelete" runat="server" OnClientClick="javascript:return confirm('Are you sure ?');" OnClick="btnDelete_OnClick" />
    </ItemTemplate>
</asp:Repeater>

Answer 4

Here's what you need to do:

• enable script manager (which you did)

• create a web service, which will handle a callback into your code:

  [WebService] [ScriptService] public class MyWebService : System.Web.Services.WebService { [WebMethod] public int SomeCallbackFunction() { .... } }

• put a link to a web service proxy into script manager (generated by [ScriptService]):

      <asp:ScriptManager runat="server" ID="scriptManagerId">
          <Services>
              <asp:ServiceReference  Path="WebService.asmx" />
          </Services>
      </asp:ScriptManager>
  

• In your javascript, you will be able to use the callback:

  function Blablabla() { MyWebService.SomeCallbackFunction() }

This is only a general idea, of course, this code probably needs some polishing. You can lookip for more examples here: http://msdn.microsoft.com/en-us/library/bb398995.aspx