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aspx thread: Custom controls questions:
Message #1 by <zivf@m...> on Mon, 25 Mar 2002 12:48:49 +0200
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1. How can I know (in the code running for the control) if the control
is currently in design time or runtime.
2. I have overriden the CreateChildControls memeber function to create
my controls, and everything seems to work fine, but the "Design time
support" microsoft is so proud of does not seem to draw any HTML on the
web-form designer, so instead of a placeholder (like seen with
user-controls) I see nothing.
anyone?
Message #2 by "Goh Mingkun" <mangokun@h...> on Tue, 26 Mar 2002 09:19:34
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You can take a look at the following code, and see whether you can get
anything useful out of it.
__________________________________________________
Imports System
Imports System.ComponentModel
Imports System.Web.UI
Imports System.Web.UI.WebControls
<DefaultProperty("Text"), ToolboxData("<{0}:LabeledTextbox runat=server></
{0}:LabeledTextbox>")> Public Class LabeledTextbox
Inherits System.Web.UI.WebControls.WebControl
Private _text As String
Private _label As String = "Caption"
<Bindable(True), Category("Appearance")> Public Property [Text]() As
String
Get
Return _text
End Get
Set(ByVal Value As String)
_text = Value
If Me.ChildControlsCreated Then
Me.Controls.Clear()
CreateChildControls()
End If
End Set
End Property
<Category("Appearance")> Public Property [Label]() As String
Get
Return _label
End Get
Set(ByVal Value As String)
_label = Value
If Me.ChildControlsCreated Then
Me.Controls.Clear()
CreateChildControls()
End If
End Set
End Property
Protected Overrides Sub CreateChildControls()
Dim _childText As New TextBox()
_childText.Text = _text
Me.Controls.Add(New LiteralControl(_label & ": "))
Me.Controls.Add(_childText)
End Sub
Private Sub LabeledTextbox_Init(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.Init
Me.Height = New Unit(16)
Me.Width = New Unit(256)
' Use EnsureChildControls to force a CreateChildControls call
' if it has't been done already.
Me.EnsureChildControls()
End Sub
End Class
Note:
1. The "Render" event should be removed.
2. If i say that only the _Init event is triggered automatically during
Design time, therefore the statement "Me.EnsureChildControls()" will make
sure that CreateChildControls() is triggered if ChildControlsCreated
returns false.
3. The rest I leave it to you to find out and modify.
You can read up on the Documentation on "EnsureChildControls".
Previous message:
> 1. How can I know (in the code running for the control) if the control
is currently in design time or runtime.
2. I have overriden the CreateChildControls memeber function to create
my controls, and everything seems to work fine, but the "Design time
support" microsoft is so proud of does not seem to draw any HTML on the
web-form designer, so instead of a placeholder (like seen with
user-controls) I see nothing.
anyone?
Message #3 by "Trainer, Frank" <FTrainer@u...> on Tue, 26 Mar 2002 14:40:42 -0600
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-----Original Message-----
From: Goh Mingkun [mailto:mangokun@h...]
Sent: Tuesday, March 26, 2002 3:20 AM
To: ASP+
Subject: [aspx] Re: Custom controls questions:
You can take a look at the following code, and see whether you can get
anything useful out of it.
__________________________________________________
Imports System
Imports System.ComponentModel
Imports System.Web.UI
Imports System.Web.UI.WebControls
<DefaultProperty("Text"), ToolboxData("<{0}:LabeledTextbox runat=server></
{0}:LabeledTextbox>")> Public Class LabeledTextbox
Inherits System.Web.UI.WebControls.WebControl
Private _text As String
Private _label As String = "Caption"
<Bindable(True), Category("Appearance")> Public Property [Text]() As
String
Get
Return _text
End Get
Set(ByVal Value As String)
_text = Value
If Me.ChildControlsCreated Then
Me.Controls.Clear()
CreateChildControls()
End If
End Set
End Property
<Category("Appearance")> Public Property [Label]() As String
Get
Return _label
End Get
Set(ByVal Value As String)
_label = Value
If Me.ChildControlsCreated Then
Me.Controls.Clear()
CreateChildControls()
End If
End Set
End Property
Protected Overrides Sub CreateChildControls()
Dim _childText As New TextBox()
_childText.Text = _text
Me.Controls.Add(New LiteralControl(_label & ": "))
Me.Controls.Add(_childText)
End Sub
Private Sub LabeledTextbox_Init(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.Init
Me.Height = New Unit(16)
Me.Width = New Unit(256)
' Use EnsureChildControls to force a CreateChildControls call
' if it has't been done already.
Me.EnsureChildControls()
End Sub
End Class
Note:
1. The "Render" event should be removed.
2. If i say that only the _Init event is triggered automatically during
Design time, therefore the statement "Me.EnsureChildControls()" will make
sure that CreateChildControls() is triggered if ChildControlsCreated
returns false.
3. The rest I leave it to you to find out and modify.
You can read up on the Documentation on "EnsureChildControls".
Previous message:
> 1. How can I know (in the code running for the control) if the control
is currently in design time or runtime.
2. I have overriden the CreateChildControls memeber function to create
my controls, and everything seems to work fine, but the "Design time
support" microsoft is so proud of does not seem to draw any HTML on the
web-form designer, so instead of a placeholder (like seen with
user-controls) I see nothing.
anyone?
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