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Item Type: NewsGroup Date Entered: 2/18/2004 4:46:37 PM Date Modified: Subscribers: 0 Subscribe Alert
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dlongieliere
Asp.Net User
Composite control question...2/18/2004 4:46:37 PM

0/0

Im developing a web application and i wanted to make it easily expandable by including a dynamic inclusion of composite controls at run time based on data coming off the sql server in thier profile.

however, when attempting to create a composite control that lets say, would display a message from a director, it works. but if i want to have that same control handle if the director is the person viewing it, add a button to create a new message, change the control to a textbox, and a submit button, it works. the problem is, that im getting no handler on the second post back to the submit button.

does this make sense?
sedgewick
Asp.Net User
Re: Composite control question...2/18/2004 5:01:47 PM

0/0

Step through and what do you see?

All the controls have to be added to the control tree again

so lets say you have 7 controls that are added programatically

They don't handle their events until they've been added again

Maybe post some code before I really screw things up
Get ready to blast your energy levels into high gear with Sedgewick Energy Drink. High powered adaptogenic herbs mixed with potent levels of B-vitamins and...

Please disregard the contents of this post.
dlongieliere
Asp.Net User
Re: Composite control question...2/18/2004 5:14:23 PM

0/0

This basically recreates the problem im having. I realize that this isnt how to do it properly, as its not working, just not finding any real support for this type or problem, atleast not in vb.net...

basically i just want to make steps first one, calls teh second, second calls the third, third loops to begining again....

any thoughts?

Namespace test
Public Class component
Inherits Control
Implements INamingContainer

Public Sub sub1(ByVal sender As Object, ByVal e As EventArgs)
'Me.Controls.Clear()

Dim btn As New Button
btn.Text = "Click here to call the second sub"
Me.Controls.Add(btn)
AddHandler btn.Click, AddressOf sub2

End Sub
Public Sub sub2(ByVal sender As Object, ByVal e As EventArgs)
Me.Controls.Clear()
Page.Response.Write("This is the end point.")
Dim btn As New Button
btn.Text = "click here to call the start point again"
Me.Controls.Add(btn)

End Sub

Protected Overrides Sub CreateChildControls()
Dim lbl As New Label
lbl.Text = "Start Point"
Me.Controls.Add(lbl)

Dim btn As New Button
btn.Text = "click here to call first sub"
Me.Controls.Add(btn)
AddHandler btn.Click, AddressOf sub1



End Sub


End Class
End Namespace
sedgewick
Asp.Net User
Re: Composite control question...2/18/2004 8:34:09 PM

0/0

oh I see

you know, the handler is only added when the button is clicked.

so this will never work, see what I mean?

You'd have to click the first button to get the second button and handler added, but on post back it will never get recreated unless you always click button 1!

So what you will want to do is have a variable - in a public property - it is a boolean that you set to true in button 1 click event

and in your createchildControls, thats where you will create all your buttons.

If you want to have unlimited buttons, then make your property an arrayList or hashtable
Get ready to blast your energy levels into high gear with Sedgewick Energy Drink. High powered adaptogenic herbs mixed with potent levels of B-vitamins and...

Please disregard the contents of this post.
dlongieliere
Asp.Net User
Re: Composite control question...2/18/2004 8:37:39 PM

0/0

mind whipping me up a quick example of what you mean? pseudo is fine.
sedgewick
Asp.Net User
Re: Composite control question...2/18/2004 9:18:45 PM

0/0

I haven't coded much in vb for 2 years so this is probably screwed up 



private _buttons as ArrayList





public property Buttons as ArrayList


get  return _buttons








set _buttons = value


' is that how a property looks in VB?





end property





'.... inside create child controls


foreach string s in Buttons ' this is supposed to be a foreach loop


dim button as new Button


button.Text = s


button.Command += ' a command event thinger here


button.CommandArgument = s


button.Click += ' and you could use this one instead


me.Controls.Add(button)


end foreach


I guess because your creating unknown number of buttons, its better to use Command event rather than click, I don't know.

in your click event (or command if you want ot use that one) you would add a string to the arrayList, but because createchild controls has already been called, you have to add it to the controls collection still... or I guess you could
me.Controls.clear()
and then call CreateChildControls

You know, maybe I should code this out in vb

in your click
Get ready to blast your energy levels into high gear with Sedgewick Energy Drink. High powered adaptogenic herbs mixed with potent levels of B-vitamins and...

Please disregard the contents of this post.
master4eva
Asp.Net User
Re: Composite control question...2/19/2004 1:49:55 PM

0/0

The error was that you were adding the reference to the delegated methods for the events after the control was added to the control tree. This is the error: 


Me.Controls.Add(btn) 


AddHandler btn.Click, AddressOf sub1

It should have been: 


AddHandler btn.Click, AddressOf sub1


Me.Controls.Add(btn)
-- Justin Lovell
dlongieliere
Asp.Net User
Re: Composite control question...2/19/2004 3:36:26 PM

0/0

yeah ive tried it both ways, without any luck
master4eva
Asp.Net User
Re: Composite control question...2/20/2004 1:37:08 PM

0/0

There is also one thing that I forgot to mention. The button that causes the post back must be present in the page control hierarchy must be there during post back.
-- Justin Lovell
9 Items, 1 Pages 1 |< << Go >> >|


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