CSharp: asp.net MessageBox

 Demo 1: DHTML modal dialog box (dhtmlgoodies.com)

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91

using System; using System.Web.UI; using System.Web; using System.Text; using System.Collections;   namespace LeeGunn.Web.UI.MessageBox {     /// <summary>     /// Summary description for MessageBox.     /// </summary>     public class MessageBox     {       private static Hashtable m_executingPages = new Hashtable();           private MessageBox(){}         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() );          }       }    } }