"j is null"

[Jonathan]

similar to another post on the forum, I'm receiving the error:

j is null

on the line:

var l=(j.get_allowDelete()!=null)?j.get_allowDelete():this.get_allowDelete();

This occurs when I mouse over a calendar event. I'm using radtooltip to display a tooltip with details of the event. I'm also using a custom provider (based on Exchange managed web services).

I have programmed this as a web control (.ascx) that then gets called to display on my page.

source of LiveCalendar.ascx.cs:

using System;
using System.Drawing;
using System.IO;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using CRD.LiveCalendars.Helpers;
using CRD.LiveCalendars.Models;
using CRD.LiveCalendars.Providers;
using Telerik.Web.UI;
using System.Web.UI.WebControls;

namespace CRD.LiveCalendars
{
    public partial class LiveCalendar : System.Web.UI.UserControl
    {
        public ViewTabs DefaultViewTab { get; set; }

        public string ExchangeServerName { get; set; }
        public string ExchangeMailbox { get; set; }
        public string UserName { get; set; }
        public string UserDomain { get; set; }
        public string UserPass { get; set; }
        public bool ShowViewDay { get; set; }
        public bool ShowViewWeek { get; set; }
        public bool ShowViewMonth { get; set; }
        public int CalendarWidth { get; set; }

        int dayStartHour { get; set; }
        public int DayStartHour
        {
            get
            {
                if (dayStartHour > 0)
                    return dayStartHour;
                else return 9;
            }
            set
            { dayStartHour = value; }
        }

        int dayStartMinute { get; set; }
        public int DayStartMinute
        {
            get
            {
                if (dayStartMinute > 0)
                    return dayStartMinute;
                else return 0;
            }
            set
            { dayStartMinute = value; }
        }

        int dayEndHour { get; set; }
        public int DayEndHour
        {
            get
            {
                if (dayEndHour > 0)
                    return dayEndHour;
                else return 17;
            }
            set
            { dayEndHour = value; }
        }

        int dayEndMinute { get; set; }
        public int DayEndMinute
        {
            get
            {
                if (dayEndMinute > 0)
                    return dayEndMinute;
                else return 0;
            }
            set
            { dayEndMinute = value; }
        }

        protected void Page_Init(object sender, EventArgs e)
        {
            string serverPath = string.Format("http://{0}/EWS/Exchange.asmx", ExchangeServerName);

            ExchangeProvider provider;
            try
            {
                provider = new ExchangeProvider(serverPath, UserName, UserPass, UserDomain, ExchangeMailbox);
            }
            catch (Exception)
            {
                provider = null;
            }

            if (provider == null)
            {
                RadScheduler1.Visible = false;
                DisplayError();
            }
            else
            {
                RadScheduler1.Provider = provider;
            }
        }

        private void DisplayError()
        {
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            RadScheduler1.AppointmentDataBound += new Telerik.Web.UI.AppointmentDataBoundEventHandler(RadScheduler1_AppointmentDataBound);
            RadScheduler1.AppointmentCreated += new AppointmentCreatedEventHandler(RadScheduler1_AppointmentCreated);

            if (!Page.IsPostBack)
                SetupCalendar();

            SetupWebResources();
        }

        private void SetupWebResources()
        {
            HtmlLink lnkCss = new HtmlLink();
            lnkCss.Attributes.Add("media", "screen");
            lnkCss.Attributes.Add("type", "text/css");
            lnkCss.Attributes.Add("rel", "Stylesheet");

            ////Get the name of the Web Resource.
            String resourceName = "CRD.LiveCalendars.assets.styles.LiveCalendar.css";

            ////Get the type of the class.
            Type resourceType = typeof(CRD.LiveCalendars.LiveCalendar);

            //// Get a ClientScriptManager reference from the Page class.
            ClientScriptManager cs = Page.ClientScript;
            lnkCss.Href = cs.GetWebResourceUrl(resourceType, resourceName);
            Page.Header.Controls.Add(lnkCss);
            Page.Header.Controls.AddAt(0, lnkCss);
        }

        private void SetupCalendar()
        {
            // show only tabs provided in xml, and only if there is more than one option
            RadScheduler1.DayView.UserSelectable = ShowViewDay;
            RadScheduler1.WeekView.UserSelectable = ShowViewWeek;
            RadScheduler1.MonthView.UserSelectable = ShowViewMonth;

            // there must always be at least one ViewType. the method that parses the xml settings returns "WeekView" if nothing else is provided.
            RadScheduler1.SelectedView = (SchedulerViewType)Enum.Parse(typeof(SchedulerViewType), DefaultViewTab.ToString());

            RadScheduler1.TimelineView.UserSelectable = false;

            RadScheduler1.EnableDatePicker = false;
            //RadScheduler1.TimeZoneOffset = new TimeSpan(-7, 0, 0);
            //RadScheduler1.TimeZoneOffset = new TimeSpan(-8, 0, 0);
            RadScheduler1.DayStartTime = new TimeSpan(DayStartHour, DayStartMinute, 0);
            RadScheduler1.DayEndTime = new TimeSpan(DayEndHour, DayEndMinute, 0);

            RadScheduler1.Width = CalendarWidth;
        }

        void RadScheduler1_AppointmentDataBound(object sender, Telerik.Web.UI.SchedulerEventArgs e)
        {
            Appointment a = e.Appointment;

            a.BackColor = ColorTranslator.FromHtml(AppointmentHelpers.ColourFromDescription(a.Description));
            a.Attributes.Add("content", AppointmentHelpers.CleanUpDescription(a.Description));
            a.CssClass = "apo";

            // and "lighten the load" by resetting the heavy, MS-laden description to a text only description
            // I don't think description is actually used... but it *is* serialized out into JSON and embedded
            // in the page source
            a.Description = "";// AppointmentFormatters.StripHtml(a.Description);
        }

        void RadScheduler1_AppointmentCreated(object sender, AppointmentCreatedEventArgs e)
        {
            if (e.Appointment.Visible)
            {
                string id = e.Appointment.ID.ToString();

                foreach (string domElementID in e.Appointment.DomElements)
                {
                    Telerik.Web.UI.RadToolTip tt = new RadToolTip()
                    {
                        TargetControlID = domElementID,
                        ShowEvent = ToolTipShowEvent.OnMouseOver,
                        RelativeTo = ToolTipRelativeDisplay.Element,
                        Text = BuildToolTipHtml(e.Appointment),
                        IsClientID = true,
                        ShowDelay = 0,
                        AutoCloseDelay = 0 // popup continues to be displayed as long as moused over
                    };

                    phDefaultHolder.Controls.Add(tt);
                }
            }
        }

        private string BuildToolTipHtml(Appointment appo)
        {
            string description = appo.Attributes["content"];

            HtmlGenericControl div = new HtmlGenericControl("div");
            div.Attributes.Add("class", "tooltip");

            HtmlGenericControl divApoTitle = new HtmlGenericControl("div");
            divApoTitle.Attributes.Add("class", "ToolTipAppointmentTitle");
            divApoTitle.InnerHtml = appo.Subject;

            HtmlGenericControl divApoTimes = new HtmlGenericControl("div");
            divApoTimes.Attributes.Add("class", "ToolTipAppointmentTimes");
            divApoTimes.InnerHtml = string.Format("{0} - {1}", appo.Start.ToLocalTime().ToString("t"), appo.End.ToLocalTime().ToString("t"));

            HtmlGenericControl divApoDescription = new HtmlGenericControl("div");
            divApoDescription.Attributes.Add("class", "ToolTipAppointmentDescription");
            divApoDescription.InnerHtml = description;

            div.Controls.Add(divApoTitle);
            div.Controls.Add(divApoTimes);
            div.Controls.Add(divApoDescription);

            //div.InnerHtml = description;

            string result = string.Empty;
            using (StringWriter sw = new StringWriter())
            {
                var writer = new System.Web.UI.HtmlTextWriter(sw);
                div.RenderControl(writer);
                result = sw.ToString();
                writer.Close();
            }

            return result;
        }
    }
}

any help appreciated

Jonathan

[Peter]

Hi Jonathan,

A safer and easier implementation is the approach from this demo -
http://demos.telerik.com/aspnet-ajax/scheduler/examples/radtooltip/defaultcs.aspx

Let me know if there is a reason why you cannot use it for your case.


Regards,
Peter
the Telerik team