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control question

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This message was discovered on ASPFriends.com 'aspngcontrolsvb' list.

Cameron Elliot

-- Copied from [aspngfreeforall] to [aspngcontrolsvb] by Tim Musschoot <Click here to reveal e-mail address> --

Hi,
I have created a few of my own user and custom controls and have =
discovered through msdn how to created databound templated controls. =
What I would like to know is how to create a control/class similar to =
ListItem where free text can go in between the open and close tag.

ie <blah:CustomListItem value=3D"1">one</blah:CustomListItem>

How is it the the text 'one' gets assigned to the ListItem's Text =
property? Would be great if I had the source code so I could see how =
this is done.

Any suggestions welcome.
Cameron

Reply to this message...

Emil Christopher Melar

I will with pleasure and proudness show you how:

NOTE: This is in VB, convert to C# if needed!
-
Private _itemTemplate As ITemplate = Nothing 'Declares the template to
be implemented.
...

<TemplateContainer(GetType(ExMenuItem))> Public Property ItemTemplate()
As ITemplate
Get
Return _itemTemplate
End Get
Set(ByVal Value As ITemplate)
_itemTemplate = Value
End Set
End Property
...

Public Class ExMenuItem : Inherits Control : Implements INamingContainer

Private _ItemIndex As Integer
Private _DataItem As Object

Public Sub New(ByVal ItemIndex As Integer, ByVal DataItem As Object)
MyBase.New()
_ItemIndex = ItemIndex
_DataItem = DataItem
End Sub

Public ReadOnly Property DataItem() As Object
Get
Return _DataItem
End Get
End Property

Public ReadOnly Property ItemIndex() As Integer
Get
Return _ItemIndex
End Get
End Property

...

INSIDE ONDATABINDING:

Dim DataEnum As IEnumerator = DataSource.GetEnumerator()
Dim I As Integer = 0
Do While (DataEnum.MoveNext())

' create item
Dim Item As ExMenuItem = New ExMenuItem(I,
DataEnum.Current)
' initialize item from template
ItemTemplate.InstantiateIn(Item)
' add item to the child controls collection
WHATEVER.Controls.Add(Item) ' where whatever is your
placeholder

I = I + 1
Loop

' prevent child controls from being created again
ChildControlsCreated = True
' store the number of items created in viewstate for
postback scenarios
ViewState("NumItems") = I
End If
---

That's the VERY basics... Itemtemplate.. Now outside the loop, you can
implement headers and footers :)
...

Public Class ExMenuMainFooter : Inherits Control : Implements
INamingContainer

Private _DataItem As Object

Public ReadOnly Property DataItem() As Object
Get
Return _DataItem
End Get
End Property

End Class
---
ETC

Get it?
-
Emil Chr. Melar

-----Original Message-----
From: Cameron Elliot [mailto:Click here to reveal e-mail address]
Sent: 20. mai 2002 22:39
To: aspngcontrolsvb
Subject: [aspngcontrolsvb] control question

-- Copied from [aspngfreeforall] to [aspngcontrolsvb] by Tim Musschoot
<Click here to reveal e-mail address> --

Hi,
I have created a few of my own user and custom controls and have =
discovered through msdn how to created databound templated controls. =
What I would like to know is how to create a control/class similar to =
ListItem where free text can go in between the open and close tag.

ie <blah:CustomListItem value=3D"1">one</blah:CustomListItem>

How is it the the text 'one' gets assigned to the ListItem's Text =
property? Would be great if I had the source code so I could see how =
this is done.

Any suggestions welcome.
Cameron
| [aspngcontrolsvb] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngcontrolsvb.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives

Reply to this message...

	System.Collections.IEnumerator
	System.Web.UI.INamingContainer
	System.Web.UI.ITemplate
	System.Web.UI.MobileControls.TemplateContainer
	System.Web.UI.WebControls.ListItem

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