using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;
using System.Text;
/// <summary>
/// Summary description for MessageBox
/// </summary>
public class MessageBox
{
private static Hashtable m_executingPages = new Hashtable();
public MessageBox()
{
//
// TODO: Add constructor logic here
//
}
public static void Show(string sMessage)
{
// If this is the first time a page has called this method then
if(!m_executingPages.Contains(HttpContext.Current.Handler))
{
// Attempt to cast HttpHandler as a Page.
Page executingPage = HttpContext.Current.Handler as Page;
if(executingPage != null)
{
// Create a Queue to hold one or more messages.
Queue messageQueue = new Queue();
// Add our message to the Queue
messageQueue.Enqueue(sMessage);
// Add our message queue to the hash table. Use our page reference
// (IHttpHandler) as the key.
m_executingPages.Add(HttpContext.Current.Handler, messageQueue);
// Wire up Unload event so that we can inject
// some JavaScript for the alerts.
executingPage.Unload += new EventHandler(ExecutingPage_Unload);
}
}
else
{
// If were here then the method has allready been
// called from the executing Page.
// We have allready created a message queue and stored a
// reference to it in our hastable.
Queue queue = (Queue) m_executingPages[HttpContext.Current.Handler];
// Add our message to the Queue
queue.Enqueue(sMessage);
}
}
// Our page has finished rendering so lets output the
// JavaScript to produce the alert's
private static void ExecutingPage_Unload(object sender, EventArgs e)
{
// Get our message queue from the hashtable
Queue queue = (Queue) m_executingPages[HttpContext.Current.Handler];
if(queue != null)
{
StringBuilder sb = new StringBuilder();
// How many messages have been registered?
int iMsgCount = queue.Count;
// Use StringBuilder to build up our client slide JavaScript.
sb.Append("<script language='javascript'>");
// Loop round registered messages
string sMsg;
while(iMsgCount-- > 0)
{
sMsg = (string) queue.Dequeue();
sMsg = sMsg.Replace( "\n", "\\n" );
sMsg = sMsg.Replace( "\"", "'" );
sb.Append( @"alert( """ + sMsg + @""" );" );
}
// Close our JS
sb.Append(@"</script>");
// Were done, so remove our page reference from the hashtable
m_executingPages.Remove(HttpContext.Current.Handler);
// Write the JavaScript to the end of the response stream.
HttpContext.Current.Response.Write(sb.ToString());
}
}
}
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