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Dynamically created controls in RadCalendar

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Calendar

This is a migrated thread and some comments may be shown as answers.

John Mann asked on 16 Jun 2009, 04:29 PM

I have a user control that I dynamically create in the cells of a radcalendar. The control is based on the results of a database query that takes place in the DayRender event for each day of the calendar. Any given day can have zero, none or many of the user controls created within it. All this works fine, the problem is that none of the events associated with the user control ever get called when triggered. For instance if a checkbox is clicked the page will postback, but the event for this checkbox in the usercontrol doesn't execute. I know why this is, but I don't know how to fix it. Normally I would create/recreate my user controls in OnInit, but since this is happening in DayRender the controls don't exist when the page posts back. How can I get this to work?

Thank you,

John

(I had mistakenly posted this in the non-Ajax forum previously)

9 Answers, 1 is accepted

answered on 24 Jun 2009, 09:59 PM

Okay, here it is. I'm still figuring out how this works, so I'm sure there is lots of room for improvement. Any suggestions are welcome.

John

aspx:

    
            <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="TestApp.WebForm1" %> 
        
            <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> 
        
            <!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">  
        
              <telerik:RadScriptManager ID="RadScriptManager1" runat="server">  
        
              </telerik:RadScriptManager> 
        
              <div> 
        
                <telerik:RadCalendar ID="RadCalendar1" runat="server" Font-Names="Arial,Verdana,Tahoma" ForeColor="Black" Style="border-color: #ececec" DayNameFormat="Short" EnableViewState="False" PresentationType="Preview">  
        
                </telerik:RadCalendar> 
        
              </div> 
        
              <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> 
        
              </form> 
        
            </body> 
        
            </html>

Code behind:

    
            using System;  
        
            using System.Collections.Generic;  
        
            using System.Linq;  
        
            using System.Web;  
        
            using System.Web.UI;  
        
            using System.Web.UI.WebControls;  
        
            using Telerik.Web.UI;  
        
            namespace TestApp  
        
            {  
        
              public partial class WebForm1 : System.Web.UI.Page  
        
              {  
        
                protected override void OnInit(EventArgs e)  
        
                {  
        
                  int someData = 0;  
        
                  DateTime rcDate = RadCalendar1.CalendarView.ViewStartDate;  
        
                  while (rcDate <= RadCalendar1.CalendarView.ViewEndDate)  
        
                  {  
        
                    // someData could be a useful bit of information or even a control that needs to be added to a day cell  
        
                    CalendarDayTemplate template = new CalendarDayTemplate(RadCalendar1, rcDate, someData);  
        
                    rcDate = rcDate.AddDays(1.0);  
        
                    someData++;  
        
                  }  
        
                  // this is optional, sets the style of the sells programmatically  
        
                  RadCalendar1.DayRender += new Telerik.Web.UI.Calendar.DayRenderEventHandler(RadCalendar1_DayRender);  
        
                  base.OnInit(e);  
        
                }  
        
                protected void Page_Load(object sender, EventArgs e)  
        
                {  
        
                }  
        
                void RadCalendar1_DayRender(object sender, Telerik.Web.UI.Calendar.DayRenderEventArgs e)  
        
                {  
        
                  TableCell myCell = e.Cell;  
        
                  myCell.Style.Add(HtmlTextWriterStyle.VerticalAlign, "Top");  
        
                  myCell.BackColor = System.Drawing.Color.White;  
        
                  myCell.BorderColor = System.Drawing.ColorTranslator.FromHtml("#e0e0e0");  
        
                }  
        
              }  
        
              public class CalendarDayTemplate : ITemplate  
        
              {  
        
                private Control cellContent = new Control();  
        
                public CalendarDayTemplate(RadCalendar myCalendar, DateTime cellDate, int myData)  
        
                {  
        
                  RadCalendarDay newDay = new RadCalendarDay();  
        
                  PlaceHolder myPlaceHolder = new PlaceHolder();  
        
                  Page myPage = new Page();  
        
                  Label lblDate = new Label();  
        
                  lblDate.Style.Add(HtmlTextWriterStyle.TextAlign, "center");  
        
                  lblDate.Width = Unit.Pixel(80);  
        
                  lblDate.BackColor = System.Drawing.Color.AliceBlue;  
        
                  lblDate.Text = cellDate.ToString("M/d");  
        
                  myPlaceHolder.Controls.Add(lblDate);  
        
                  // Dynamically add whatever controls you need here. Possibly based on values read from a database.  
        
                  // If only one control is being added to a cell the PlaceHolder isn't necessary  
        
                  for (int counter = 0; counter < 3; counter++)  
        
                  {  
        
                    LiteralControl br = new LiteralControl("<br />");  
        
                    TextBox myTextBox = new TextBox();  
        
                    myTextBox.Text = "" + myData;  
        
                    myTextBox.Width = Unit.Pixel(30);  
        
                    myTextBox.AutoPostBack = true;  
        
                    myTextBox.TextChanged += new EventHandler(myTextBox_TextChanged);  
        
                    myTextBox.ID = "mtb" + myData + "-" + counter;  
        
                    myPlaceHolder.Controls.Add(br);  
        
                    myPlaceHolder.Controls.Add(myTextBox);  
        
                  }  
        
                  this.cellContent = myPlaceHolder;  
        
                  // Create a DayTemplate with a unique ID  
        
                  DayTemplate dayTemplate = new DayTemplate();  
        
                  dayTemplate.ID = cellDate.ToString("MMddyyyy");  
        
                  dayTemplate.Content = this;  
        
                  // create a SpecialDay, associate it with the DayTemplate and add to Calendar  
        
                  newDay.Date = cellDate;  
        
                  newDay.TemplateID = dayTemplate.ID;  
        
                  myCalendar.SpecialDays.Add(newDay);  
        
                  myCalendar.CalendarDayTemplates.Add(dayTemplate);  
        
                }  
        
                // Once the RadCalendar is instantiated this will be called once for each cell
        
                public void InstantiateIn(Control container)  
        
                {  
        
                  container.Controls.Add(this.cellContent);  
        
                }  
        
                protected void myTextBox_TextChanged(object sender, EventArgs e)  
        
                {  
        
                  // do something here based on user input  
        
                }  
        
              }  
        
            }

answered on 28 Aug 2020, 09:57 PM

Attila, help me a lot this this code:

ASPX: <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>

ASPX.cs:

protected void Page_Init(object sender, EventArgs e)
{
var calendar = new RadCalendar() { ID = "RadCalendar1" };

var newDayTemplate = new DayTemplate() { ID="MyDayTemplate" };

newDayTemplate.Content = new CustomDayTemplate();

calendar.CalendarDayTemplates.Add(newDayTemplate);

RadCalendarDay NewDay = new RadCalendarDay(calendar);
NewDay.Date = DateTime.Now.Date;
NewDay.Repeatable = Telerik.Web.UI.Calendar.RecurringEvents.DayAndMonth;
NewDay.TemplateID = "MyDayTemplate";
NewDay.ToolTip = "My custom Template";

calendar.SpecialDays.Add(NewDay);

PlaceHolder1.Controls.Add(calendar);
}

class CustomDayTemplate : ITemplate
{
public void InstantiateIn(Control container)
{

var lbl = new Label() { ID = "Label1" };

lbl.DataBinding += Lbl_DataBinding;

container.Controls.Add(lbl);
}

private void Lbl_DataBinding(object sender, EventArgs e)
{
var lbl = (Label)sender;

lbl.Text = "MyDay";
}
}

#jefferson2020