Updatepanel not working in content page

Question

1.00/5 (1 vote)

See more:

Hello experts,
I have a dropdown in which i am adding checkboxlist at code behind.
when I checked any item from checkbox list, dropdown hide automatically. The same code is working properly without master page.
I need your urgent help.
Master Page:

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>

<!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>
    
    <asp:ContentPlaceHolder id="head" runat="server">
        
    </asp:ContentPlaceHolder>
</head>
<body>
    <form id="form1" runat="server">
    
    <div><h1>Hello World</h1></div>
    <div>
    
            <asp:ContentPlaceHolder id="MainContent" runat="server">
        
            </asp:ContentPlaceHolder>
        
    </div>
    </form>
</body>
</html>

Content Page.aspx:

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">

<link href="bootstrap.min.css" rel="stylesheet" type="text/css" />
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server">
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<div>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
                                <ContentTemplate>
                                    <div class="dropdown">
                                        <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">
                                            Dropdown Example
                                <span class="caret"></span>
                                        </button>
                                        <asp:Panel class="dropdown-menu" ID="pnlList" runat="server" Style="overflow-x: hidden; overflow-y: scroll; height: 225px" OnInit="pnlList_Init"></asp:Panel>
                                    </div>
                                </ContentTemplate>
                            </asp:UpdatePanel>
</div>
</asp:Content>

Content Page.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    Panel pnl;
    string[] lst_main = { "A", "B", "C", "D", "E"};
    string[] lst_child = { "1", "2", "3", "4", "5" };
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void pnlList_Init(object sender, EventArgs e)
    {
        #region Generate Checkbox
        //if (IsPostBack)
        //{
        for (int i = 0; i < lst_main.Count(); i++)
        {
            pnl = new Panel();
            pnl.CssClass = "pnl-mrgn";
            CheckBox chkmain = new CheckBox();
            chkmain.ID = lst_main[i].ToString();
            //chkmain.CheckedChanged += new System.EventHandler(chkmain_CheckedChanged);
            chkmain.Text = lst_main[i].ToString();
            chkmain.CssClass = "margin-right";
            chkmain.Enabled = false;
            //chkmain.AutoPostBack = true;
            //chkmain.CheckedChanged += (obj, args) =>
            //{
            //    if (chkmain.Checked.Equals(true))
            //    {
            //        txtvalue.Text += chkmain.Text;
            //    }
            //};
            pnl.Controls.Add(chkmain);
            CheckBoxList chkchild = new CheckBoxList();
            chkchild.ID = "chkList_" + lst_main[i].ToString();
            chkchild.RepeatDirection = RepeatDirection.Horizontal;
            chkchild.AutoPostBack = true;
            chkchild.SelectedIndexChanged += new System.EventHandler(chkchild_SelectedIndexChanged);
            //chkchild.SelectedIndexChanged += (obj, args) =>
            //{
            //    if (chkchild.SelectedItem != null)
            //        txtvalue.Text += chkchild.SelectedItem.Value;
            //};
            for (int j = 0; j < lst_child.Count(); j++)
            {

                System.Web.UI.WebControls.ListItem li = new System.Web.UI.WebControls.ListItem();
                li.Text = lst_child[j].ToString();
                chkchild.Items.Add(li);
                pnl.Controls.Add(chkchild);
            }

            pnlList.Controls.Add(pnl);
            //pnlList.ContentTemplateContainer.Controls.Add(pnl);
        }
        //}
        #endregion
    }
    protected void chkchild_SelectedIndexChanged(object sender, EventArgs e)
    {
        string result = Request.Form["__EVENTTARGET"];
        string[] checkedBox = result.Split('$');
        int index = int.Parse(checkedBox[checkedBox.Length - 1]);
        //int thisIndex = 0;
        CheckBoxList objCheckBoxList = sender as CheckBoxList;
        int thisIndex = objCheckBoxList.SelectedIndex;

        string lsSelectdVal = "";

        if (index >= 0 && index < 4 && objCheckBoxList.Items[index].Selected)
        {
            for (int i = index; i <= 4; i++)
            {
                objCheckBoxList.Items[i].Selected = true;
                lsSelectdVal += checkedBox[2].Split('_')[1] + ":" + (i + 1) + ",";
            }
            //CheckBox chk = FindControl(checkedBox[2].Split('_')[1]) as CheckBox;
            CheckBox chk = (CheckBox)this.FindControl("ctl00").FindControl("MainContent").FindControl(checkedBox[2].Split('_')[1]);
            chk.Checked = true;
        }
        if (index == 4 && objCheckBoxList.Items[index].Selected)
        {
            CheckBox chk = (CheckBox)this.FindControl("ctl00").FindControl("MainContent").FindControl(checkedBox[2].Split('_')[1]);
            chk.Checked = true;

            //else
            //{
            //    CheckBox chk = (CheckBox)this.FindControl("pnlList").FindControl(checkedBox[0].Split('_')[1]);
            //    chk.Checked = false;
            //}
        }

        if (thisIndex == -1)
        {
            CheckBox chk = (CheckBox)this.FindControl("ctl00").FindControl("MainContent").FindControl(checkedBox[2].Split('_')[1]);
            chk.Checked = false;
        }
        //((UpdatePanel)this.FindControl("ctl00").FindControl("MainContent").FindControl("UpdatePanel1")).Update();

        //objCheckBoxList.Items[0].Selected = true;
        //ListItem objListItem;
        //string selectedItems = string.Empty;
        //foreach (ListItem listitem in objCheckBoxList.Items)
        //{
        //    if (listitem.Selected)
        //    {
        //        thisIndex = objCheckBoxList.Items.IndexOf(listitem);               
        //    }
        //}

        //Label1.Text = lsSelectdVal;
    }
}

What I have tried:

I tried with above sample code which working properly without master page.
but actual code must be with master page.

Posted 9-Sep-19 6:56am

KManishS

Updated 19-Sep-19 3:59am

Add a Solution

Comments

[no name] 9-Sep-19 15:08pm

I thought "content" was for the "form", not the master.

KManishS 10-Sep-19 1:46am

what to do now to achieve this?

F-ES Sitecore 10-Sep-19 6:38am

Step through the code and see how it behaves differently on a master page. ie is a line throwing an exception that it didn't before, is a call to FindControl returning null when it returned an object before and so on.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

CoolBeans1 · Answer 1 · 2019-09-12T10:16:00

just use the below for your master

@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>

<!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 id="Head1" runat="server">
    <title></title>
  
</head>
<body>
    <form id="form1" runat="server">
    
    <div><h1>Hello World</h1></div>
    <div>
 
        
    </div>
    </form>
</body>
</html>