Custom Event Handler on a Extended Calendar Control

Question

User1851297965 posted

I hope this is the right place to post this. For the record i've tried google and searching but i can't find what im looking in regards to Custom Event Handlers.

I've extended the Calendar control to put event names into each day based on a couple of projects on codeproject. But what im trying to add now is an event handler to the event name so when i put it in the web page i can call the event when the event name is clicked and display the information about the event. But i'm lost to how i can create this. The only thing i can manage to do is add the javascript to the event name and call the SelectionChanged event. But i feel thats a hack job and i want to do it properly.

Can someone explain to me how to achieve what i want to do or lead me in the right direction. Thanks.

 

1    using System;
2    using System.Collections;
3    using System.Collections.Generic;
4    using System.ComponentModel;
5    using System.Data;
6    using System.Text;
7    using System.Web;
8    using System.Web.UI;
9    using System.Web.UI.WebControls;
10   
11   namespace ExtendedControls
12   {
13       [ToolboxData("&lt;{0}:EventCalendar runat=server></{0}:EventCalendar>")]
14       public class EventCalendar : Calendar
15       {
16           #region Constructor
17   
18           public EventCalendar()
19               : base()
20           {
21               DayRender += new DayRenderEventHandler(EventCalendarDayRender);
22           }
23   
24           #endregion
25   
26           #region Properties
27   
28           public DataTable EventSource
29           {
30               get {
31   
32                   DataTable s = ViewState["EventSource"] as DataTable;
33                   return s == null ? null : s;
34               }
35               set 
36               { 
37                   ViewState["EventSource"] = value; 
38               }
39           }
40   
41           public string EventStartDateColumnName
42           {
43               get
44               {
45                   string s = ViewState["StartDateColumnName"] as string;
46                   return s == null ? String.Empty : s;
47               }
48               set 
49               { 
50                   ViewState["StartDateColumnName"] = value; 
51               }
52           }
53   
54           public string EventEndDateColumnName
55           {
56               get
57               {
58                   string s = ViewState["EndDateColumnName"] as string;
59                   return s == null ? String.Empty : s;
60               }
61               set
62               {
63                   ViewState["EndDateColumnName"] = value;
64               }
65           }
66   
67           public string EventHeaderColumnName
68           {
69               get
70               {
71                   string s = ViewState["EventHeaderColumnName"] as string;
72                   return s == null ? String.Empty : s;
73               }
74               set
75               {
76                   ViewState["EventHeaderColumnName"] = value;
77               }
78           }
79   
80           public string EventCssClass
81           {
82               get
83               {
84                   string s = ViewState["EventCssClass"] as string;
85                   return s == null ? String.Empty : s;
86               }
87               set
88               {
89                   ViewState["EventCssClass"] = value;
90               }
91           }
92   
93           #endregion
94   
95           #region Methods
96   
97           protected void EventCalendarDayRender(object sender, DayRenderEventArgs e)
98           {           
99               CalendarDay     d   = ((DayRenderEventArgs)e).Day;
100              TableCell       c   = ((DayRenderEventArgs)e).Cell;
101              
102              // If there is nothing to bind
103              if (this.EventSource == null)
104              {
105                  return;
106              }
107  
108              //Get the Event Source
109              DataTable table = this.EventSource;
110  
111              //Loop through each row
112              foreach (DataRow row in table.Rows)
113              {
114                  #region Check Required Columns
115  
116                  if (EventStartDateColumnName == string.Empty)
117                  {
118                      throw new ApplicationException("Must set EventCalendar's EventStartDateColumnName property when EventSource is specified");
119                  }
120                  if (EventEndDateColumnName == string.Empty)
121                  {
122                      throw new ApplicationException("Must set EventCalendar's EventEndDateColumnName property when EventSource is specified");
123                  }
124                  if (EventHeaderColumnName == string.Empty)
125                  {
126                      throw new ApplicationException("Must set EventCalendar's EventHeaderColumnName property when EventSource is specified");
127                  }
128  
129                  #endregion
130  
131                  DateTime startDate  = Convert.ToDateTime(row[this.EventStartDateColumnName]);
132                  DateTime endDate    = Convert.ToDateTime(row[this.EventEndDateColumnName]);
133                  string cssClass     = string.Empty;
134  
135                  if (EventCssClass != null && row[EventCssClass] != null && row[EventCssClass].ToString() != "")
136                  {
137                      cssClass = row[EventCssClass].ToString();
138                  }
139  
140                  if (!d.IsOtherMonth && d.Date >= startDate.Date && d.Date <= endDate.Date)
141                  {
142                      HyperLink hpl       = new HyperLink();
143                      Panel pnl           = new Panel();
144                                                            
145                      // Show the Event Text
146                      hpl.Text            = row[EventHeaderColumnName].ToString();
147                      hpl.NavigateUrl     = string.Format("javascript:__doPostBack('Calendar1','{0}')", row["Id"]);
148  
149                      pnl.Controls.Add(hpl);
150  
151                      c.Controls.Add(pnl);
152                  }
153              }
154          }
155  
156          #endregion
157      }
158  }
159  

  

Answer 1

User1851297965 posted

 I've added the stuff i highlighted in red. Which fire's the event and it has the right Command Name and Arguement but it fire's on page load. I can't get it to fire when the button is clicked....

1            #region Methods
2    
3            protected void EventCalendarDayRender(object sender, DayRenderEventArgs e)
4            {           
5                CalendarDay     d   = ((DayRenderEventArgs)e).Day;
6                TableCell       c   = ((DayRenderEventArgs)e).Cell;
7                
8                // If there is nothing to bind
9                if (this.EventSource == null)
10               {
11                   return;
12               }
13   
14               //Get the Event Source
15               DataTable table = this.EventSource;
16   
17               //Loop through each row
18               foreach (DataRow row in table.Rows)
19               {
20                   #region Check Required Columns
21   
22                   if (EventStartDateColumnName == string.Empty)
23                   {
24                       throw new ApplicationException("Must set EventCalendar's EventStartDateColumnName property when EventSource is specified");
25                   }
26                   if (EventEndDateColumnName == string.Empty)
27                   {
28                       throw new ApplicationException("Must set EventCalendar's EventEndDateColumnName property when EventSource is specified");
29                   }
30                   if (EventHeaderColumnName == string.Empty)
31                   {
32                       throw new ApplicationException("Must set EventCalendar's EventHeaderColumnName property when EventSource is specified");
33                   }
34   
35                   #endregion
36   
37                   DateTime startDate  = Convert.ToDateTime(row[this.EventStartDateColumnName]);
38                   DateTime endDate    = Convert.ToDateTime(row[this.EventEndDateColumnName]);
39                   string cssClass     = string.Empty;
40   
41                   if (EventCssClass != null && row[EventCssClass] != null && row[EventCssClass].ToString() != "")
42                   {
43                       cssClass = row[EventCssClass].ToString();
44                   }
45   
46                   if (!d.IsOtherMonth && d.Date >= startDate.Date && d.Date <= endDate.Date)
47                   {
48                       Button lbtn = new Button();
49                       Panel pnl           = new Panel();
50                                                             
51                       // Show the Event Text
52                       lbtn.Text = row[EventHeaderColumnName].ToString();
53                       //hpl.NavigateUrl     = string.Format("javascript:__doPostBack('Calendar1','{0}')", row["Id"]);
54   
55                       //lbtn.CommandArgument = row["Id"].ToString();
56                       //lbtn.CommandName = "EventClicked";
57                       //lbtn.Command += new CommandEventHandler(lbtn_Command);
58   
59                       CommandEventArgs args = new CommandEventArgs("EventClicked", row["Id"].ToString());
60                       OnEventClicked(args);
61   
62                       pnl.Controls.Add(lbtn);
63   
64                       c.Controls.Add(pnl);
65                   }
66               }
67           }
68   
69           #endregion
70   
71   
72   
73           protected static readonly object EventClick = new object();
74   75           public event CommandEventHandler EventClicked
76           {
77               add
78               {
79                   base.Events.AddHandler(EventClick, value);
80               }
81               remove
82               {
83                   base.Events.RemoveHandler(EventClick, value);
84               }
85           }
86   87           protected virtual void OnEventClicked(CommandEventArgs commandEventArgs)
88           {
89               CommandEventHandler eventHandler = (CommandEventHandler)Events[EventClick];
90               if (eventHandler != null)
91               {
92                   eventHandler(this, commandEventArgs);
93               }
94               base.RaiseBubbleEvent(this, commandEventArgs);
95           }

  

Answer 2

User1968518401 posted

Where is lbtn click event?

Answer 3

User1851297965 posted

 It doesn't work so i deleted it.

 I thought of adding the code in the button click event but none of the controls i add end up being server controls...

 Like.. none of the controls have an id or naming container or anything. The output is like:

<td align="left" valign="top" style="height:100px;width:80px;">
            <a href="javascript:__doPostBack('Calendar1','3163')" style="color:Black" title="August 29">29</a> <--- auto generated
            <div>
                         <a href="javascript:__doPostBack('CalendarUpdatePanel','Event3')">My Three Days Event</a>   <---- my div and link.
            </div>
</td>

 

The hack job i've done for now to continue working on this project is:

 

 

       protected override void OnLoad(EventArgs e)
        {

            if (this.Page.Request.Form["__EVENTARGUMENT"] != null)
            {
                if (this.Page.Request.Form["__EVENTARGUMENT"].ToString().Contains("Event"))
                {
                    string few = this.Page.Request.Form["__EVENTARGUMENT"].ToString();
                    string id = few.Remove(0, 5);
                    CommandEventArgs args = new CommandEventArgs("EventClicked", id);
                    OnEventClicked(args);
                }
            }

            base.OnLoad(e);
        }

        protected static readonly object EventClick = new object();

        public event CommandEventHandler EventClicked
        {
            add
            {
                base.Events.AddHandler(EventClick, value);
            }
            remove
            {
                base.Events.RemoveHandler(EventClick, value);
            }
        }

        protected virtual void OnEventClicked(CommandEventArgs commandEventArgs)
        {
            CommandEventHandler eventHandler = (CommandEventHandler)Events[EventClick];
            if (eventHandler != null)
            {
                eventHandler(this, commandEventArgs);
            }
            base.RaiseBubbleEvent(this, commandEventArgs);
        }