[.net] Strange problem with adding buttons dynamically to webforms
4GuysFrom Rolla has a great article on just this subject. There's an <asp:placeholder> which you can use when you add the control to the page to tell the page where to render the control. That would be even easier than using the panel solution I mentioned.
Author
I got a solution, but it gives me a problem as well.
I just make a usercontrol, place it on the page, and then add the controls to it rather than the page. Since it is inbetween the form tags, it works.
The problem? Before I inherited the page class for my class, and then my class in the .aspx page (my class basically was an extension of the page class). I then have a function you override to handle your button command events.
Now I need some way to pass this to my function to use in addhandler, rather than having a handler that you override. Anybody know a good way to go about this?
OnSelect (the function you override) looked like this:
So basically, you inherit my class and override the function. That is no longer the case. I have my function using the addhandler keyword, they look like this:
I need a way to pass the function I want to use to AddressOf. I tried delegates and all that stuff, but I just can't seem to figure it out.
EDIT: Nevermind, I got it.
[Edited by - xg0blin on October 12, 2004 10:17:09 AM]
I just make a usercontrol, place it on the page, and then add the controls to it rather than the page. Since it is inbetween the form tags, it works.
The problem? Before I inherited the page class for my class, and then my class in the .aspx page (my class basically was an extension of the page class). I then have a function you override to handle your button command events.
Now I need some way to pass this to my function to use in addhandler, rather than having a handler that you override. Anybody know a good way to go about this?
OnSelect (the function you override) looked like this:
Public Overridable Sub OnSelect(ByVal obj As Object, ByVal e As CommandEventArgs)End SubSo basically, you inherit my class and override the function. That is no longer the case. I have my function using the addhandler keyword, they look like this:
Public Sub DrawSingleSystemWithButton(ByVal Position As Integer, ByVal Systems1 As MainSystems, ByVal NestedSystems1 As NestedSystems, ByVal ButtonText As String) Dim SystemTable As System.Web.UI.WebControls.Table = New System.Web.UI.WebControls.Table Dim ButtonRow As System.Web.UI.WebControls.TableRow = New System.Web.UI.WebControls.TableRow Dim ButtonCell As System.Web.UI.WebControls.TableCell = New System.Web.UI.WebControls.TableCell Dim MyButton As System.Web.UI.WebControls.Button = New System.Web.UI.WebControls.Button DrawHeaderRow(SystemTable) DrawSystem(Position, Systems1, NestedSystems1, SystemTable) MyButton.Text = ButtonText MyButton.Width = Unit.Percentage(100) ButtonCell.ColumnSpan = 2 ButtonCell.Controls.Add(MyButton) ButtonRow.Cells.Add(ButtonCell) SystemTable.Rows.Add(ButtonRow) Me.Controls.Add(SystemTable) AddHandler MyButton.Command, AddressOf OnSelectEnd SubI need a way to pass the function I want to use to AddressOf. I tried delegates and all that stuff, but I just can't seem to figure it out.
EDIT: Nevermind, I got it.
[Edited by - xg0blin on October 12, 2004 10:17:09 AM]
Author
Quote:Original post by Zul
Out of curiousity, was it:
AddHandler MyButton.ServerClick, AddressOf OnSelect
?
No. My code is at work. I'll show it to you tomorrow. Just check this thread in the morning.
Author
Ok, here is what I did:
Notice I pass in a System.Web.UI.WebControls.CommandEventHandler and then that is what gets called in the AddHandler section. Then I make a method (in whatever class I want, it doesn't matter) and pass AddressOf NameOfMethodIWantToUseForHandler as the argument for the function.
Public Sub DrawSingleSystemWithButton(ByVal Position As Integer, ByVal Systems1 As MainSystems, ByVal NestedSystems1 As NestedSystems, ByVal ButtonText As String, ByVal CommandClicked As System.Web.UI.WebControls.CommandEventHandler) Dim SystemTable As System.Web.UI.WebControls.Table = New System.Web.UI.WebControls.Table Dim ButtonRow As System.Web.UI.WebControls.TableRow = New System.Web.UI.WebControls.TableRow Dim ButtonCell As System.Web.UI.WebControls.TableCell = New System.Web.UI.WebControls.TableCell Dim MyButton As System.Web.UI.WebControls.Button = New System.Web.UI.WebControls.Button DrawHeaderRow(SystemTable) DrawSystem(Position, Systems1, NestedSystems1, SystemTable) MyButton.Text = ButtonText MyButton.Width = Unit.Percentage(100) ButtonCell.ColumnSpan = 2 ButtonCell.Controls.Add(MyButton) ButtonRow.Cells.Add(ButtonCell) SystemTable.Rows.Add(ButtonRow) Me.Controls.Add(SystemTable) AddHandler MyButton.Command, CommandClickedEnd SubNotice I pass in a System.Web.UI.WebControls.CommandEventHandler and then that is what gets called in the AddHandler section. Then I make a method (in whatever class I want, it doesn't matter) and pass AddressOf NameOfMethodIWantToUseForHandler as the argument for the function.
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