open a confirmation dialog from code behind

Question

I have a button click event and in that after satisfying some condition , i should confirm dialog, if user clicks ok in that dialog, i want to proceed further in my code.

public void imgValidAdd_Click(object sender, ImageClickEventArgs e)
{
  try
  {
     // Some Code
     if(A==b)
     {
        // Open Confirm dialog
        if(ok)
        {
           // Proceed
        }
     }
  }
  catch()
  {
  }
}

I have tried so many approaches, but nothing worked out

How to call confirm message from code behind in asp.net?

in the above link, i tried and implemented but the thing is ,if you don't postback the page, it doesn't work because appendChild command doesn't clear previous values

How do i work on this. help me on this.

Answer 1

You can do something like this:

On aspx side

1) add a button for confirmed clicked

hidden button
<asp:Button ID="btnConfirmed" runat="server" OnClick="btnConfirmed_Clicked" style="display:none"/>

2) add a javascript function for confirm dialog

//Add a javascript openconfirmdialog() on aspx
function openconfirmdialog() {
    if(confirm('Confirm message')) {
        //fire hidden button click
        $('#<%=btnConfirmed.ClientID%>').click();
    } else {
        //else message
    }
}

On aspx.cs server side

3) fire javascript function from server side using Page.ClientScript

public void imgValidAdd_Click(object sender, ImageClickEventArgs e)
{
    try
    {
        // Some Code
        if(A==b)
        {
            // Open Confirm dialog
            Page.ClientScript.RegisterStartupScript(typeof(Page), "openconfirmjs", "<script>openconfirmdialog();</script>");
        }
    }
    catch()
    {
    }
}

4) Add a confirm button click method

public void btnConfirmed_Clicked(object sender, EventArgs e) {
    // Proceed
}

Answer 2

You could use window.confirm

https://developer.mozilla.org/en-US/docs/Web/API/Window/confirm

if (window.confirm("Do you really want to ___?")) { 
  // do thing
} else {
  // don't do thing?
}