如何使用c＃ASP.NET显示警报提示？

Question

I can not show the alert message after data submitted inside DB using c# ASP.NET.I am explaining my code below.

mission.aspx.cs:

protected void submit_Click(object sender, EventArgs e)
{

    missionBO objMissionBo = new missionBO();
    if (HiddenField1.Value == "")
    {
        objMissionBo.heading = TextBox1.Text.Trim();
        if (insertimage.HasFile)
        {
            //int length = insertimage.PostedFile.ContentLength;
            string filename = insertimage.FileName;
            insertimage.PostedFile.SaveAs(Server.MapPath(@"~\Upload\" + filename.Trim()));
            string path = filename.Trim();
            //byte[] imgbyte = new byte[length];
            //HttpPostedFile img = insertimage.PostedFile;
            //img.InputStream.Read(imgbyte, 0, length);
            objMissionBo.image = path;

        }
        objMissionBo.description = TextBox2.Text.Trim();
        missionvissionBL objMissionBL = new missionvissionBL();
        string action = "insert";
        int result = objMissionBL.insertMissionData(objMissionBo, action);
        if (result == 1)
        {
            ClientScript.RegisterStartupScript(this.GetType(), "prompt", "var value = prompt('Data inserted successfully.'); storeinput(value);", true);
            clearAll();
            Response.Redirect("missionvision.aspx");
        }
        else
        {
            ClientScript.RegisterStartupScript(this.GetType(), "prompt", "var value = prompt('Data could not inserted successfully.'); storeinput(value);", true);
        }
    }

<script>
    function storeinput(value) {
        console.log('value',value);
        document.getElementById("<%=hidValue.ClientID%>").value = value;
    }
</script>

My requirement here, is that I have show the success/ error message after every submit of value.

Answer 1

I use the following code the alert a popup on serverside. Although it is VB you can just convert it.

Dim strMsg As String
strMsg = "<script language=javascript> alert('Hi'); </script>"
Page.RegisterStartupScript("alert", strMsg)

Answer 2

public class MessageBox { private static Hashtable m_executingPages = new Hashtable();

public MessageBox(){}

/// <summary>
/// Show alert window
/// </summary>
/// <param name="sMessage">Alert text</param>
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);
    }
}

  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() );
    }
  }

}

You can use MessageBox class just call : MessageBox.Show("TEST"); and that`s it.

Answer 3

Use below solution for prompt message from c#

Just call where needed GetMessage function in your code as shown in below line

GetMessage("warning","Your message which you want to disply")

Below provided function is for alert prompt

public void GetMessage(string messageType, string message)
{
   StringBuilder sb = new StringBuilder();
   sb.Append("<script type='text/javascript'>");
   sb.Append("alert('" + messageType + " : " + message + "');");
   sb.Append("</script>");
   ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "ajax", sb.ToString(), false);
}

if message or message type will contain " or ' then you have to use Replace to avoid problems for example message.Replace("'", " ");

Answer 4

protected void submit_Click(object sender, EventArgs e)
{

    missionBO objMissionBo = new missionBO();
    if (HiddenField1.Value == "")
    {
        objMissionBo.heading = TextBox1.Text.Trim();
        if (insertimage.HasFile)
        {
            //int length = insertimage.PostedFile.ContentLength;
            string filename = insertimage.FileName;
            insertimage.PostedFile.SaveAs(Server.MapPath(@"~\Upload\" + filename.Trim()));
            string path = filename.Trim();
            //byte[] imgbyte = new byte[length];
            //HttpPostedFile img = insertimage.PostedFile;
            //img.InputStream.Read(imgbyte, 0, length);
            objMissionBo.image = path;

        }
        objMissionBo.description = TextBox2.Text.Trim();
        missionvissionBL objMissionBL = new missionvissionBL();
        string action = "insert";
        int result = objMissionBL.insertMissionData(objMissionBo, action);
        if (result == 1)
        {
            ClientScript.RegisterStartupScript(this.GetType(), "prompt", "alert('Data inserted successfully.'); storeinput('"+result +"');", true);
            clearAll();
            Response.Redirect("missionvision.aspx");
        }
        else
        {
            ClientScript.RegisterStartupScript(this.GetType(), "prompt", "alert('Data could not inserted successfully.'); storeinput('"+result +"');", true);
        }
    }

<script>
    function storeinput(value) {
        console.log('value',value);
        document.getElementById("<%=hidValue.ClientID%>").value = value;
    }
</script>