Display a “Yes / No” alert box in C# code behind

Question

I am trying to display a "Yes / No" messagebox from codebehind in C#. I want to call an "AddRecord" procedure if the user clicks "Yes", and do nothing if the user clicks "No".

Ideally, I want to use the code below, but from codebehind:

OnClientClick = "return confirm('Are you sure you want to delete?');"

I search on SO and google, but was not able to find anything helpful.

Answer 1

on your Add Record button, just do the following:

    <asp:button ID="AddRecordbutton" runat="server" Text="Add Record"
 onclick="AddRecordButton_Click" onclientclick="return confirm('add record?');" />

In your code behind, just put the add record code in your AddRecordButton_Click event handler. It will only be called if they click Yes on the popup.

---

Alternatively, you could have your codebehind assign the onclientclick code when the button is initially rendered.

For example:

protected void Page_Load(object sender, EventArgs e) {
  AddRecordButton.OnClientClick = @"return confirm('Add Record?');";
}

Answer 2

If you use the Ajax Control Toolkit Modal Popup Extender on a Panel with your two buttons this will fire an event on the server which can be handled and execute whichever method/functions you wish

See here for an example

Answer 3

Use RegisterStartupScript

ScriptManager.RegisterStartupScript(this, GetType(), "unique_key",
    "element.onclick = function(){ return confirm('Are you sure you want to delete?'); };",
    true);

Answer 4

No, you don't.

You seem to be misunderstanding that basic concept of webpage.

An ASPX page is a short program, which starts-up, generates seem HTML, and then terminates. The HTML is then sent across the Internet to the users browser. EVERYTHING you do in a codebehind must be complete before the user ever sees any of it.

You really want a javascript dialog box. (Actually, from what you describe, you could just create a messagebox-looking div in HTML with a standard HTML form on it.)

Answer 5

To display an actual messagebox you will need javascript as it is done on the client-side. For whatever reason, if you cannot use javascript, you could do what AEMLoviji has suggested and "fake" it with some cleverness.

Note that you do not need jQuery to display a messagebox, simple javascript will suffice.

Answer 6

To show yes/no

<script>     
        function AlertFunction() {
            if (confirm('Are you sure you want to save this thing into the database?')) {
               $('#ConfirmMessageResponse').val('Yes');
            } else {
                $('#ConfirmMessageResponse').val('No');
            }
        }
    </script>

to handle it from .net side:

string confirmValue = ConfirmMessageResponse.Value;
                if (confirmValue == "Yes")
                {...}