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Old January 31st, 2007, 07:05 PM
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Default JavaScript OK/Cancel msgbox in ASP.Net

Hi all,

I know how to give a simple "msgbox" in ASP.Net / VB.Net:

Response.Write("<Script language=Javascript> window.alert('my message') </Script>")

But I can't find anwhere how to do a 2-button "msgbox", e.g., to get the user's confirmation that they really want to delete an item.

I really appreciate any help!


Old February 1st, 2007, 11:14 AM
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You can use the confirm method as below:

If (confirm("Are you sure to delete?"))
    return true;
    return false;


Fortune favours the brave, so don't regret on missed oppurtunities.
Old February 1st, 2007, 01:11 PM
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Hi Mike,

Thanks for your reply, but I think you're assuming I know more than I do (which isn't too much)... the code you suggested doesn't work in straight VB. I've seen examples on the web where they modify the HTML, but I can't get those to work either.

What I finally found was to add the code to Page_Load:
  ibtnSave.Attributes.Add("language", "javascript")
  ibtnSave.Attributes.Add("OnClick", "return confirm('Are you sure?');")
When OK is clicked, it runs the button click event code; when Cancel is clicked it doesn't.

Again, thanks for your reply.
 -- another Mike

Old February 5th, 2007, 03:06 PM
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It sounds like you are trying to mix client side behavior with server side behavior. You can not use the client side methods (alert, confirm, prompt) to bring back data to the server.

What you are seeing is that when the user answer 'OK', the postback button gets "clicked" because the onclick handler is returned 'true'. If they answer 'Cancel', the handler is return false, which basically cancels the user's click action and the form never posts.

In order to achieve what you are looking for, you need to write some more javascript to take the return value from the message box at the client, put them in a server control, such as a hidden form element, and then let the form postback so you can evaluate the resulting value (from the hidden element) and then do what you wish on the server side.


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