ASP.NET: Apply a Please Wait message to a Button

Summary: An example of how we can append a "Please Wait" message to a Button when submitting a form.

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Example page with a button:

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default1.aspx.vb" Inherits="Default1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>

Code-Behind:

Partial Class Default15
Inherits System.Web.UI.Page
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
System.Threading.Thread.Sleep(5000)
ClientScript.RegisterClientScriptBlock(Me.GetType, _
"reset", "document.getElementById('" & Button1.ClientID & "').disabled=false;", True)
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Button1.Attributes.Add("onclick", ClientScript.GetPostBackEventReference(Button1, "") _
& ";this.value='Please wait...';this.disabled = true;")
End Sub
End Class

This Hack is part of the ASP.NET Hacks collection

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