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ASP.net content page event called before page load

Posted on 2008-06-19
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Last Modified: 2013-11-07
I have a master page with a content page container.  On the master page I have a toolbar.  When a button is clicked on the toolbar I raise an event and then capture it in my content page.  This part works perfectly.  My problem is that Iwoudl like to perform some action on the content page based on whcih toolbat buttobn the user clicks on the master page.  For example, I woudl liek to set some text on the content page to what the text is on the toolbar button they click.  My problem is that the page load event of the content page is called before my custom event handler.  So when I set the text on the form it never gets updated.

Is there any way areound this?
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Question by:akobes05
  • 4
6 Comments
 
LVL 18

Expert Comment

by:Richard Lee
ID: 21827303
You may want to have an event in your master page that your content pages can attach to (Event, Delegates). The event handler events will be raised within toolbar button event. This should allows the desired result you wish.
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LVL 6

Expert Comment

by:rafayali
ID: 21827306
Umm, not sure . Can you paste some code? It is sometimes easier to look at code then try to depict through words.
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LVL 18

Expert Comment

by:Richard Lee
ID: 21827338
You might want to have a look at these links:

http://www.codeproject.com/KB/cs/events.aspx
http://msdn.microsoft.com/en-us/library/17sde2xt(VS.71).aspx

If you haven't cracked it I willcontinue the post in the morning. I'm off to bed since its 00:30.
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Author Comment

by:akobes05
ID: 21827475
I am using delegates.  I do not knwo why the text of label1 is always blank.  LIek I said the event is raised before the page_load.

Here is the code for my master/content  pages:

>> MASTER <<

Public Delegate Sub MasterPageToolbarClickHandler(ByVal sender As Object, ByVal Idx As Integer)

Partial Class MasterPage
    Inherits System.Web.UI.MasterPage
    Public Shared Event ToolbarClick As MasterPageToolbarClickHandler

    Protected Sub Toolbar_ButtonClicked(ByVal sender As Object, ByVal be As Infragistics.WebUI.UltraWebToolbar.ButtonEvent) Handles Toolbar.ButtonClicked

        Select Case be.Button.Key
            Case "Button1"
                OnToolbarClick(1)
            Case "Button2"
                OnToolbarClick(2)
            Case "Button3"
                OnToolbarClick(3)
            Case "Button4"
                OnToolbarClick(4)
            Case "Button5"
                OnToolbarClick(5)
            Case "Button6"
                OnToolbarClick(6)
            Case "Button7"
                OnToolbarClick(7)
        End Select

    End Sub

    Protected Overridable Sub OnToolbarClick(ByVal idx As Integer)
        RaiseEvent ToolbarClick(Me, idx)
    End Sub

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    End Sub


>> CONTENT <<


Imports Infragistics.WebUI.UltraWebToolbar
Imports IBM.Data.DB2.iSeries
Imports System.Data

Partial Class Login
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

       
        If Not Page.IsPostBack Then
            SetupToolbar()
        End If
    End Sub

    Private Sub SetupToolbar()
        Dim Toolbar As UltraWebToolbar

        Toolbar = Master.FindControl("Toolbar")
        With Toolbar
            .Items(.Items.IndexOf("Button2")).text = "A"
            .Items(.Items.IndexOf("Button3")).text = "B"
            .Items(.Items.IndexOf("Button4")).text = "C"
            .Items(.Items.IndexOf("Button5")).text = "D"
        End With

        AddHandler MasterPage.ToolbarClick, AddressOf ToolbarClicked
    End Sub


    Private Sub ToolbarClicked(ByVal sender As Object, ByVal Idx As Integer)

        Dim Toolbar As UltraWebToolbar

        Select Case Idx
            Case 1
                Label1.Text = Idx
            Case 2
                Label1.Text = Idx
            Case 3
                Label1.Text = Idx
            Case 4
                Label1.Text = Idx
            Case 5
                Label1.Text = Idx
            Case 6
                Label1.Text = Idx
            Case 7
                Label1.Text = Idx
        End Select


    End Sub
End Class
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LVL 18

Accepted Solution

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Richard Lee earned 1500 total points
ID: 21829857
Okay here is the sample as promised mate. Since I am having trouble attaching the ZIP file because of the code file (*.cs) within it. You should have no problem converting to VB since there is only a few lines of c#.

If you need me to send this file as a ZIP then let me know how. VS2008 Solution. I can convert to VS2005 if you need.

I have put the code for the following files:

~/App_Code/Common.cs
~/Masters/BaseMasterPage.master
~/Masters/BaseMasterPage.master.cs
~/Default.aspx
~/Default.aspx.cs
Common.cs
--------------------
 
using System;
 
/// <summary>
/// The delegate defines the parameters sent to the event handlers
/// </summary>
public delegate void CustomEventHandler(object o, EventArgs e);
 
 
BaseMasterPage.master (located: ~/Masters)
--------------
 
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="BaseMasterPage.master.cs" Inherits="BaseMasterPage" %>
 
<!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>
    <asp:ContentPlaceHolder id="head" runat="server">
    </asp:ContentPlaceHolder>
</head>
<body>
    <form id="form1" runat="server">
    <div style="width: 100%;">
		<div style="float: left; padding: 5px; width: 100%; background-color: Silver; color: Green; font-weight: bold; text-align: left;">
			<asp:Label ID="SampleText" runat="server"></asp:Label>&nbsp;
		</div>
		
		<div style="height: 5px;">&nbsp;</div>
		
		<div style="float: left; padding: 5px; font-weight: bold; color: Blue; width: 100%; text-align: left; vertical-align: top; border: dashed 1px Black;">
			<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">
        
			</asp:ContentPlaceHolder>
		</div>
		
		<div style="height: 5px;">&nbsp;</div>
			
		<div style="float: left; padding: 5px; width: 100%; background-color: Silver; color: Black; font-weight: bold; text-align: left;">
			<asp:Button ID="Submit" runat="server" Text="Submit" OnClick="Submit_Click" />
		</div>
    </div>
    </form>
</body>
</html>
 
 
BaseMasterPage.master.cs
-------------
 
using System;
 
public partial class BaseMasterPage : System.Web.UI.MasterPage
{
	protected void Page_Load(object sender, EventArgs e)
	{
 
	}
 
	public event CustomEventHandler btnUpdateEvent;
 
	protected void Submit_Click(object sender, EventArgs e)
	{
		SampleText.Text = String.Format("Master Page: {0} {1}", DateTime.Now.ToLongDateString(), DateTime.Now.ToLongTimeString());
 
		// Raise events
		if (btnUpdateEvent != null)
			btnUpdateEvent(sender, e);
	}
}
 
 
Default.aspx
--------------
 
<%@ Page Language="C#" MasterPageFile="~/Masters/BaseMasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Title="Untitled Page" %>
 
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
	<asp:Label ID="ContentPageText" runat="server"></asp:Label>
</asp:Content>
 
 
Default.aspx.cs
----------------
 
using System;
 
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
		BaseMasterPage currentMasterPage = (BaseMasterPage)this.Master;
		currentMasterPage.btnUpdateEvent += new CustomEventHandler(UpdateText);
    }
 
	public void UpdateText(object o, EventArgs e)
	{
		ContentPageText.Text = String.Format("Content Page: {0} {1}", DateTime.Now.ToShortDateString(), DateTime.Now.ToShortTimeString());
	}
}

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LVL 18

Expert Comment

by:Richard Lee
ID: 21837132
I have ZIP the website and placed it here: http://www.avantprime.com/Profile/Richard/Samples/EE-ID23500816-Website.zip

I have t included the solution file therefore you need to select open exisitng website from visual studio.
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