show message box in web application

Question

4.00/5 (1 vote)

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hi,

i had a requirement in my web application where if i eneter value in to textbox and hit add button the values should add in to the grid..
but if i add the same value in to textbox which is already in grid and hit add button the javascript alert should display..

i wrote the logic for checking the value if already existing in grid....but having problem in diaplying the javascript alert...

please suggest

my code is like

 private void ShowMessageBox(string message)//method for showing alert box in grid when the same values are added
    {
        if (!string.IsNullOrEmpty(message))
        {
            if (message.EndsWith("."))
                message = message.Substring(0, message.Length - 1);
        }

        System.Text.StringBuilder sbScript = new System.Text.StringBuilder(500);
sbScript.Append("<script type='text/javascript'>" + Environment.NewLine);
                message = message.Replace("\n", "\\n").Replace("\"", "'");
        sbScript.Append(@"alert( """ + message + @""" );");
        sbScript.Append(@"</script>");

C#

Page currentPage = HttpContext.Current.CurrentHandler as Page;
                if (currentPage != null && !currentPage.ClientScript.IsStartupScriptRegistered("ShowMessageBox"))
        {
                        currentPage.ClientScript.RegisterStartupScript(typeof(Page), "ShowMessageBox", sbScript.ToString());
        }
        //typeof(Alert)
    }

Posted 1-Jan-14 19:45pm

spanner21

Updated 2-Jan-14 20:12pm

agent_kruger

v3

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Karthik_Mahalingam · Answer 1 · 2014-01-01T19:56:00

Hi try this..

~~Page currentPage = HttpContext.Current.CurrentHandler as Page;~~

C#

if (this.Page != null && !this.Page.ClientScript.IsStartupScriptRegistered("ShowMessageBox"))
            {
                this.Page.ClientScript.RegisterStartupScript(typeof(Page), "ShowMessageBox", sbScript.ToString());
            }

M.R.A. · Answer 2 · 2014-01-01T22:32:00

Solution 2

Page.ClientScript.RegisterStartupScript(this.GetType(), "showMyMessage", "ShowMessage('Successfully saved!');", true);

Posted 1-Jan-14 22:32pm

M.R.A.

Updated 1-Jan-14 22:50pm

v2

Ankit Roy · Answer 3 · 2014-01-02T19:08:00

Hello, I have came across a Class file, changed it a bit to work for me, This method is very easy and works everywhere, IE, Chrome and Firefox others I have not tested.

Just add this Class File to Your Project

using System;
using System.Collections;
using System.ComponentModel;
using System.Text;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace MessageAnkit
{
    
    public class MessageBox
    {

       private static Hashtable m_executingPages = new Hashtable();

       
        public static void Show(string sMessage)
        {
           
            if (!m_executingPages.Contains(HttpContext.Current.Handler))
            {
               
                Page executingPage = HttpContext.Current.Handler as Page;
                
                if (executingPage != null)
                {
                    Queue messageQueue = new Queue();
                    messageQueue.Enqueue(sMessage);
                    m_executingPages.Add(HttpContext.Current.Handler, messageQueue);
                    executingPage.Unload += new EventHandler(ExecutingPage_Unload);
                }
            }
            else
            {
                Queue queue = (Queue)m_executingPages[HttpContext.Current.Handler];
                queue.Enqueue(sMessage);
            }
        }

    
        private static void ExecutingPage_Unload(object sender, EventArgs e)
        {
         
            Queue queue = (Queue)m_executingPages[HttpContext.Current.Handler];

            if (queue != null)
            {
                StringBuilder sb = new StringBuilder();
                int iMsgCount = queue.Count;
                sb.Append("<script language='javascript'>");
                string sMsg;
                while (iMsgCount-- > 0)
                {
                    sMsg = (string)queue.Dequeue();
                    sMsg = sMsg.Replace("\n", "\\n");
                    sMsg = sMsg.Replace("\"", "'");
                    sb.Append(@"alert( """ + sMsg + @""" );");
                }

                sb.Append(@"</" + "script>");
                m_executingPages.Remove(HttpContext.Current.Handler);
                HttpContext.Current.Response.Write(sb.ToString());
            }
        }

    }
}

After that Just Add this line to display a Message

MessageAnkit.MessageBox.Show("Message String goes here");

I think this helps.

Happy Coding ... :)

Ankit Roy

show message box in web application

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