I have a page that has two buttons and a text box on it. It also has a panel named pnlPopUp and an modalpopupextender which has 'pnlPopUp' as the PopupControlID.
If you Click Button1 it will display webusercontrol1 and if you click button2 it will display webusercontrol2.
Each user control has two buttons on tem (btnOK and btnCancel).
The web user controls are added dinamically to the panel when I click button1 or button2 (using Page.LoadControl("~/WebUserControl.ascx") andpnlPopup.Controls.Add(webusercontrol) );
I am trying to fill the text of teh textbox in the page according to which button is clicked on the pop-up (if I click Ok it writes "OK" in the textbox),
but my button events aren′t firing!
P.S.: If I load the controls in the page′s Page_Load and making them visible when I need them it will work fine but I didn′t want to do that because in my actual web site i will have too many user controls.
Here′s the sample code. (I′m using the exact code for both user controls):
==================== Default.aspx=============================
<%@dotnet.itags.org. Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@dotnet.itags.org. Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<%@dotnet.itags.org. Register src="http://pics.10026.com/?src=~/WebUserControl.ascx" TagName="WebUserControl" TagPrefix="wuc" %
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<link rel="stylesheet" href="http://links.10026.com/?link=back.css" type="text/css" media="screen" />
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server" EnableViewState="true">
<ContentTemplate>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="btnPopup" runat="server" Text="PopUp" />
<input type="hidden" runat="server" id="hdnPopUp" />
<asp:Panel ID="pnlPopUp" runat="server" CssClass="modalPopup">
</asp:Panel>
<cc1:ModalPopupExtender ID="mpeTestePopUp" runat="server" TargetControlID="hdnPopUp"
PopupControlID="pnlPopUp" DropShadow="true" BackgroundCssClass="modalBackground">
</cc1:ModalPopupExtender>
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>
===========================================================
==================== Default.aspx.cs============================
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 AjaxControlToolkit;
public partial class _Default : System.Web.UI.Page
{
WebUserControl ucTestePopUp;
protected void Page_Load(object sender, EventArgs e)
{
}
void Page_Init(object sender, EventArgs e)
{
this.btnPopup.Click += new EventHandler(btnPopup_Click);
}
void btnPopup_Click(object sender, EventArgs e)
{
ucTestePopUp = (WebUserControl)Page.LoadControl("~/WebUserControl.ascx");
this.pnlPopUp.Controls.Add(ucTestePopUp);
this.mpeTestePopUp.Show();
}
}
============================================================
==================== WebUserControl.ascx============================
<%@dotnet.itags.org. Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %>
<table>
<tr>
<td>
<asp:Button runat="server" ID="btnSim" Text="Sim" />
</td>
<td>
<asp:Button runat="server" ID="btnNao" Text="Nao" />
</td>
</tr>
</table>
==================================================================
==================== WebUserControl.ascx.cs============================
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
public partial class WebUserControl : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
}
void Page_Init(object sender, EventArgs e)
{
this.btnSim.Click += new EventHandler(btnSim_Click);
this.btnNao.Click += new EventHandler(btnNao_Click);
}
protected void btnNao_Click(object sender, EventArgs e)
{
((TextBox)this.Parent.FindControl("txtTeste")).Text = "Clicou N?o";
}
protected void btnSim_Click(object sender, EventArgs e)
{
((TextBox)this.Parent.FindControl("txtTeste")).Text = "Clicou Sim";
}
}
=================================================================
Hi,
to handle events you need a control with an event handler to instantiated. If you only load your user control once in the click event handler, the button (textbox) in your user control does not exist on the page when postback caused by this button in user control is processed at the server.
Therefore, as you said you need to load your user control in page_load to handle events.
However, you don't need to load all controls. You just need to remeber which control was created last time and create this single control. You can store this information in the ViewState property.
Once you handled events from controls insode user control you can safely remove it from the page.
ALSO: You need to assign ID to your dynamically loaded user control. Otherwise, you will occasionally get problems with events firing from the second click.
-yuriy
http://couldbedone.blogspot.com
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