D
Dean Craig
I'm working with the new ASP.NET AJAX Control Toolkit. I have a map that
has several key areas (hot spots) where when the user hovers over them, I
want to pop up a small window with information in it (text, graphics,
whatever). I am using the asp:ImageMap control and I can use the
asp:circlehotspot control, but that only allows me to have a single hotspot.
What I want to do is create a new custom control that derives everything
from this circlehotspot, but adds an "ID" property. If I can reference
that, then I have have multiple hotspots on the image and each one can
trigger a different hover/pop-up panel.
I have never done this before, so I need some guidance. Where I'm running
into trouble is that there are two functions (MarkupName() and
GetCoordinates()) that are 'must override' in the base class. I don't want
to change them, but I have no idea what they are supposed to return. I
copied part of this from a page I found on the net where the guy was doing
something similar with the hotspot controls, but he was creating another
type (circle, rectangle, polygon, he was adding a 'diamond' shape). So the
code in the MarkupName() and GetCoordinates() are the two areas I'm having
trouble with and are his original code which doesn't apply to what I'm
trying to do at all. Here's what I've got so far:
Imports Microsoft.VisualBasic
Namespace foo
Public Class customcirclehotspot
Inherits System.Web.UI.WebControls.HotSpot
Public Sub New()
MyBase.New()
End Sub
Public Sub New(ByVal ID As String)
MyBase.New()
Me.ID = ID
End Sub
Public Property ID() As String
Get
Dim val As Object = ViewState("id")
If val Is Nothing Then
Return ""
Else
Return CStr(val)
End If
End Get
Set(ByVal value As String)
ViewState("id") = value
End Set
End Property
Protected Overrides ReadOnly Property MarkupName() As String
Get
Return "poly"
End Get
End Property
Public Overrides Function GetCoordinates() As String
Return CenterX.ToString() & "," & (CenterY - Height / 2).ToString()
& "," & _
(CenterX + Width / 2).ToString() & "," & CenterY.ToString()
& "," & _
CenterX.ToString() & "," & (CenterY + Height /
2).ToString() & "," & _
(CenterX - Width / 2).ToString() & "," & CenterY.ToString()
End Function
End Class
End Namespace
Am I doing it right? What do I do about the MarkupName() property and
GetCoordinates() function? I don't even know what the MarkupName is. Could
I do something as simple as Return "customcirclehotspot"?
What about the GetCoordinates() function? I have no idea what the original
returns and I don't need to change it. All I need to do is add an ID
property so the individual hotspots can be referenced by other controls.
Thanks in advance for any and all help.
has several key areas (hot spots) where when the user hovers over them, I
want to pop up a small window with information in it (text, graphics,
whatever). I am using the asp:ImageMap control and I can use the
asp:circlehotspot control, but that only allows me to have a single hotspot.
What I want to do is create a new custom control that derives everything
from this circlehotspot, but adds an "ID" property. If I can reference
that, then I have have multiple hotspots on the image and each one can
trigger a different hover/pop-up panel.
I have never done this before, so I need some guidance. Where I'm running
into trouble is that there are two functions (MarkupName() and
GetCoordinates()) that are 'must override' in the base class. I don't want
to change them, but I have no idea what they are supposed to return. I
copied part of this from a page I found on the net where the guy was doing
something similar with the hotspot controls, but he was creating another
type (circle, rectangle, polygon, he was adding a 'diamond' shape). So the
code in the MarkupName() and GetCoordinates() are the two areas I'm having
trouble with and are his original code which doesn't apply to what I'm
trying to do at all. Here's what I've got so far:
Imports Microsoft.VisualBasic
Namespace foo
Public Class customcirclehotspot
Inherits System.Web.UI.WebControls.HotSpot
Public Sub New()
MyBase.New()
End Sub
Public Sub New(ByVal ID As String)
MyBase.New()
Me.ID = ID
End Sub
Public Property ID() As String
Get
Dim val As Object = ViewState("id")
If val Is Nothing Then
Return ""
Else
Return CStr(val)
End If
End Get
Set(ByVal value As String)
ViewState("id") = value
End Set
End Property
Protected Overrides ReadOnly Property MarkupName() As String
Get
Return "poly"
End Get
End Property
Public Overrides Function GetCoordinates() As String
Return CenterX.ToString() & "," & (CenterY - Height / 2).ToString()
& "," & _
(CenterX + Width / 2).ToString() & "," & CenterY.ToString()
& "," & _
CenterX.ToString() & "," & (CenterY + Height /
2).ToString() & "," & _
(CenterX - Width / 2).ToString() & "," & CenterY.ToString()
End Function
End Class
End Namespace
Am I doing it right? What do I do about the MarkupName() property and
GetCoordinates() function? I don't even know what the MarkupName is. Could
I do something as simple as Return "customcirclehotspot"?
What about the GetCoordinates() function? I have no idea what the original
returns and I don't need to change it. All I need to do is add an ID
property so the individual hotspots can be referenced by other controls.
Thanks in advance for any and all help.
olygonHotSpot