webcontrol button with script attribute

how can I make the button_click to execute first before the script that I added in the buttons's attribute

VB Code:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here
 
        Dim scriptOk As String
        scriptOk = "window.returnValue = true; " _
        & " window.dialogArguments.strName = window.document.all.MyFile.value; " _
        & " window.close();"
        btnOk.Attributes.Add("onclick", scriptOk)
        btnCancel.Attributes.Add("onclick", "window.returnValue = false;window.close();")
    End Sub
 
Private Sub btnOk_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOk.Click
        'Response.Write("hello")
        'MyFile.PostedFile.SaveAs("")
 
    End Sub

myFile is an htmlinputfile server control, I want the file to be uploaded first before the web page execute the script to close the window

Thanks,

Jewel

You can't do what you are saying the method you suggest. The client-side onclick event will always fire before the page is Posted Back and the server-side click event is fired.

What you want to do is remove the client-side onclick event and add some code to the server-side event that uses the Page's RegisterStartupScript method.

This method executes client-side code as soon as the page reloads i.e. after your server-side Click event fires. It is used as below:

Code:

---

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        btnCancel.Attributes.Add("onclick", "window.returnValue = false; window.close();")
End Sub

Private Sub btnOk_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOk.Click
        If MyFile.PostedFile.ContentLength > 0 Then
                'Response.Write("hello")
                'MyFile.PostedFile.SaveAs("")
                RegisterStartupScript("image_uploaded", "window.returnValue = true; window.close();")
        End If
End Sub

---

The RegisterStartupScript has two arguments - the first is a unique key so it can be referenced in your code and the second is the client-side script you want to execute.

Let me know if you have any problems.

DJ