Solved

Catching click event inside an UpdatePanel of a User Control

Posted on 2009-07-06
2
559 Views
Last Modified: 2012-05-07
I was experimenting with dynamically loaded user controls.  

For some reason, when I load (from PickListUser) my PickList control, the control is displayed reasonably - with Region.xml as given, the repeater shows two lines with a name and button on each.

However, when I click the button, ONLY the load code on my host page (PickListUser) is called (with IsPostBack==true), neither the load event nor the click event on the PickList code behind are triggered.
Picklist.ascx:

---------------------------------

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Picklist.ascx.cs" Inherits="Picklist" %>

<input type="hidden" runat="server" ID="path" />

<input type="hidden"  runat="server" ID="parent" />

<asp:Repeater ID="Repeater1" runat="server" >

<ItemTemplate>

<asp:UpdatePanel runat="server" ID="mypanel" UpdateMode="Conditional">

<ContentTemplate>

<asp:Label runat="server" ID="name" Text='<%# Eval("Name") %>' />

<asp:Button runat="server" ID="select" Text="select"  /><br />

<asp:Label runat="server" ID="display" />

</ContentTemplate>

</asp:UpdatePanel>

</ItemTemplate>

</asp:Repeater>
 
 

Picklist.ascx.cs:

---------------------------------

using System;

using System.Collections.Generic;

using System.Linq;

using System.Xml;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;
 

public partial class Picklist : System.Web.UI.UserControl

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            string[] elements = path.Value.Split(',');

            XmlDataSource source = new XmlDataSource();

            source.DataFile = "App_Data/" + elements[0] + ".xml";

            Repeater1.DataSource = source;

            Repeater1.DataBind();

        }

        foreach (RepeaterItem x in Repeater1.Items)

        {

            (x.Controls[1].Controls[0].Controls[3] as Button).Click += Command;

        }

    }
 
 

    protected void Command(object source, EventArgs e)

    {

        display.Text = "foo";

    }

}
 

PickListUser.aspx

---------------------------------

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="PickListUser.aspx.cs" Inherits="PickListUser" %>
 

<!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></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

    User!

<asp:ScriptManager runat="server" ID="mgr" />

    </div>

    </form>

</body>

</html>
 
 

PicklistUser.ascx.cs:

---------------------------------

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;
 

public partial class PickListUser : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            Control main = LoadControl("~/Picklist.ascx");

            HtmlInputHidden path = main.FindControl("path") as HtmlInputHidden;

            path.Value = "region,country,call";

            FindControl("form1").Controls.Add(main);

            mgr.RegisterAsyncPostBackControl(main);

        }

    }

}
 
 

Region.xml

---------------------------------

<?xml version="1.0" encoding="utf-8" ?>

<regions>

  <region name="america" id="1" parent="0"/>

  <region name="europe" id="2" parent="0"/>

</regions>

Open in new window

0
Comment
Question by:Jens Fiederer
2 Comments
 
LVL 96

Accepted Solution

by:
Bob Learned earned 500 total points
ID: 24787982
If you are going to dynamically load the control, then it needs to be loaded all the time.  You must reload the control even if the page posts back, or none of the events will be wired up.
0
 
LVL 23

Author Closing Comment

by:Jens Fiederer
ID: 31600293
Thanks - reloading the whole kibosh did it for me ...  to my surprise, without losing state in the items I was reloading!
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
Code enhancement 5 14
c# regex: extract & replace text between braces 6 30
Check my code out(2) 1 35
VB.NET HttpWebRequest 12 34
ASP.Net to Oracle Connectivity Recently I had to develop an ASP.NET application connecting to an Oracle database.As I am doing it first time ,I had to solve several problems. This article will help to such developers  to develop an ASP.NET client…
User art_snob (http://www.experts-exchange.com/M_6114203.html) encountered strange behavior of Android Web browser on his Mobile Web site. It took a while to find the true cause. It happens so, that the Android Web browser (at least up to OS ver. 2.…
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
This video discusses moving either the default database or any database to a new volume.

747 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now