Problem with two instances of a custom class


A

anr

Hi all,

I have a problem with my XCalendar custom class. If I put
in the page one instance it works, but if i put two or more
throw an error like this:

"Multiple controls with the same ID".

The class is contained basically by a Textbox and
CalendarExtender control. And the error is is the
hightlighted line.

VB CLASS
Code:
Imports Microsoft.VisualBasic
Imports AjaxControlToolkit

Public Class XCalendar
Private _date As DateTime
Private _calendar As CalendarExtender
Private _textbox As TextBox
Private _defaulttext As String
Private _backcolor As Drawing.Color
Private _forecolor As Drawing.Color
Private _image As Image
Private _onclientdateselectionchanged As String
Private _random As New Random
Private _randomnum As String = Nothing

''' <summary>
''' (By Default "(Select)")
''' </summary>
''' <value></value>
''' <returns></returns>
''' <remarks></remarks>
Public Property DefaultText() As String
Get
Return _defaulttext
End Get
Set(ByVal value As String)
_defaulttext = value
End Set
End Property

''' <summary>
''' Control BackColor (By Default White)
''' </summary>
''' <value></value>
''' <returns></returns>
''' <remarks></remarks>
Public Property BackColor() As Drawing.Color
Get
Return _backcolor
End Get
Set(ByVal value As Drawing.Color)
_backcolor = value
End Set
End Property

''' <summary>
''' (By Default Black)
''' </summary>
''' <value></value>
''' <returns></returns>
''' <remarks></remarks>
Public Property ForeColor() As Drawing.Color
Get
Return _forecolor
End Get
Set(ByVal value As Drawing.Color)
_forecolor = value
End Set
End Property

''' <summary>
''' Returns Selected Date
''' </summary>
''' <value></value>
''' <returns></returns>
''' <remarks></remarks>
Public ReadOnly Property ReturnDate() As Date
Get
Return _date
End Get
End Property

''' <summary>
''' Shows the Control XCalendar
''' </summary>
''' <param name="XDate">Date (Optional)</param>
''' <returns>Table with the control</returns>
''' <remarks></remarks>
Public Function ShowCalendar(Optional ByVal XDate As
DateTime = Nothing) As Table
Dim xtable As Table
Dim xtablerow As TableRow
Dim xtablecell As TableCell
Dim ximage As Image
Dim xtextbox As TextBox
Dim xcalendar As CalendarExtender

ximage = New Image
xtextbox = New TextBox
xcalendar = New CalendarExtender

_image = ximage
_textbox = xtextbox
_calendar = xcalendar
_date = XDate

'Assign values for the first time
AssignDefaultValues()


System.Threading.Thread.CurrentThread.CurrentCulture = New
System.Globalization.CultureInfo("en-US")

_randomnum = Date.Now.Minute.ToString &
Date.Now.Millisecond.ToString & _random.Next(1,
1000000).ToString()

_image.ImageUrl = "~/Images/Controls/Calendar.png"
_image.ImageAlign = ImageAlign.AbsMiddle
_image.Style.Add("Cursor", "hand")
[COLOR="Red"] _image.ID = "ImageCalendar" &
_randomnum[/QUOTE]
_textbox.ID = "TextBoxCalendar" & _randomnum
_calendar.TargetControlID = _textbox.ID
_calendar.PopupButtonID = _image.ID
_calendar.Format = "dd/MMMM/yyyy"
_textbox.BorderWidth = 0
_textbox.ReadOnly = True
_textbox.Style.Add("cursor", "default")
_textbox.Style.Add("text-transform", "capitalize")
_textbox.Attributes.Add("onselectstart", "return
false")
_textbox.ReadOnly = True
_textbox.BackColor = _backcolor
_textbox.ForeColor = _forecolor

xtable = New Table
xtable.BackColor = _backcolor
xtable.BorderWidth = 0
xtable.CellPadding = 0
xtable.CellSpacing = 0

xtablerow = New TableRow
xtablerow.BorderWidth = 0

xtablecell = New TableCell
xtablecell.BorderWidth = 0
xtablecell.Width = 30
xtablecell.Controls.Add(_image)
xtablerow.Cells.Add(xtablecell)

xtablecell = New TableCell
xtablecell.BorderWidth = 0
xtablecell.Controls.Add(_textbox)
xtablecell.Controls.Add(_calendar)

xtablerow.Cells.Add(xtablecell)
xtable.Rows.Add(xtablerow)

Return xtable
End Function

''' <summary>
''' Assing Default values
''' </summary>
''' <remarks></remarks>
Private Sub AssignDefaultValues()
If _defaulttext = Nothing Then
_defaulttext = "(Select)"
End If

If _backcolor = Nothing Then
_backcolor = Drawing.Color.White
End If

If _forecolor = Nothing Then
_forecolor = Drawing.Color.Black
End If

If _date = Nothing Then
_textbox.Text = _defaulttext
Else
_textbox.Text = _date
_calendar.SelectedDate = _date
End If

'Validate Date
_onclientdateselectionchanged = "function
CalendarCheckDate(sender,args) { "
_onclientdateselectionchanged =
_onclientdateselectionchanged & "if (sender._selectedDate >
new Date())"
_onclientdateselectionchanged =
_onclientdateselectionchanged & "{"
_onclientdateselectionchanged =
_onclientdateselectionchanged & "alert('Error:\n- The date
cannot be higher than today');"
_onclientdateselectionchanged =
_onclientdateselectionchanged & "sender._selectedDate = new
Date();"
_onclientdateselectionchanged =
_onclientdateselectionchanged &
"sender._textbox.set_Value(sender._selectedDate.format(send
er._format));"
_onclientdateselectionchanged =
_onclientdateselectionchanged & "}"
_onclientdateselectionchanged =
_onclientdateselectionchanged & "}"

_calendar.OnClientDateSelectionChanged =
_onclientdateselectionchanged
End Sub
End Class

Page.aspx
Code:
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1"
runat="server" />
<asp:Label ID="LabelCalendar1" runat="server"
Text=""></asp:Label><br />
<asp:Label ID="LabelCalendar2" runat="server"
Text=""></asp:Label>
</div>
</form>
</body>

Page.vb
Code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e
As System.EventArgs) Handles Me.Load
Dim Calendar1 As New XCalendar

LabelCalendar1.Controls.Add(Calendar1.ShowCalendar(Date.Now
))

Dim calendar2 As New XCalendar

LabelCalendar2.Controls.Add(calendar2.ShowCalendar(Date.Par
se("2000-05-30")))
End Sub


When I execute Page.aspx, throw the error in the line
highlight in red

What Can I do?? (Really sorry for my bad English)


thx for the help! :D
 
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H

Hans Kesting

anr pretended :
Hi all,

I have a problem with my XCalendar custom class. If I put
in the page one instance it works, but if i put two or more
throw an error like this:

"Multiple controls with the same ID".

The class is contained basically by a Textbox and
CalendarExtender control. And the error is is the
hightlighted line.

VB CLASS
Code:
Imports Microsoft.VisualBasic
Imports AjaxControlToolkit

Public Class XCalendar [snip]

What Can I do?? (Really sorry for my bad English)


thx for the help! :D
[/QUOTE]

Implement the INamingContainer interface. You don't need to do anything
special other than mention that is *does* implement that interface.

Shouldn't this control at least derive from "Control"?

Hans Kesting
 

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