How do I determine which button was clicked

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I have added handlers handlers to direct all buttons to one method like
this;

'Add handlers for buttons
AddHandler btnManageJobs.Click, AddressOf Button_Click
AddHandler btnSeqOfOper.Click, AddressOf Button_Click
AddHandler btnViewer.Click, AddressOf Button_Click
AddHandler btnScfmCalculationTool.Click, AddressOf Button_Click
AddHandler btnAdminSetup.Click, AddressOf Button_Click

How do I determine which button was clicked? I think I use "sender" but
do not know how. Can someone help me?

Thank you,
dbuchanan
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Re: How do I determine which button was clicked by Tim

Tim
Sat Nov 12 10:07:57 CST 2005

If you need to access properties specific to the Button class then you can
cast the "sender" to the Button type using DirectCast.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vblr7/html/vakeydirectcast.asp

To compare the "sender" to the buttons to see which Button was clicked you
can do something similar to the following code.

Private Sub Button_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs)
If (sender Is Button1) Then
' Handle Button1.Click
ElseIf (sender Is Button2) Then
' Handle Button2.Click
ElseIf (sender Is Button3) Then
' Handle Button3.Click
End If
End Sub

--
Tim Wilson
.NET Compact Framework MVP

"dbuchanan" <dbuchanan52@hotmail.com> wrote in message
news:1131810063.022402.100780@g44g2000cwa.googlegroups.com...
> I have added handlers handlers to direct all buttons to one method like
> this;
>
> 'Add handlers for buttons
> AddHandler btnManageJobs.Click, AddressOf Button_Click
> AddHandler btnSeqOfOper.Click, AddressOf Button_Click
> AddHandler btnViewer.Click, AddressOf Button_Click
> AddHandler btnScfmCalculationTool.Click, AddressOf Button_Click
> AddHandler btnAdminSetup.Click, AddressOf Button_Click
>
> How do I determine which button was clicked? I think I use "sender" but
> do not know how. Can someone help me?
>
> Thank you,
> dbuchanan
>


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Re: How do I determine which button was clicked by Herfried

Herfried
Sat Nov 12 10:15:45 CST 2005

"dbuchanan" <dbuchanan52@hotmail.com> schrieb:
>I have added handlers handlers to direct all buttons to one method like
> this;
>
> 'Add handlers for buttons
> AddHandler btnManageJobs.Click, AddressOf Button_Click
> AddHandler btnSeqOfOper.Click, AddressOf Button_Click
> AddHandler btnViewer.Click, AddressOf Button_Click
> AddHandler btnScfmCalculationTool.Click, AddressOf Button_Click
> AddHandler btnAdminSetup.Click, AddressOf Button_Click
>
> How do I determine which button was clicked? I think I use "sender" but
> do not know how. Can someone help me?


\\\
Dim SourceControl As Button = DirectCast(sender, Button)
Select Case True
Case SourceControl Is btnManageJobs
...
Case...
...
End Select
///

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
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Re: How do I determine which button was clicked by Vagabond

Vagabond
Sat Nov 12 10:19:00 CST 2005

"dbuchanan" <dbuchanan52@hotmail.com> wrote in message
news:1131810063.022402.100780@g44g2000cwa.googlegroups.com...
>I have added handlers handlers to direct all buttons to one method like
> this;
>
> 'Add handlers for buttons
> AddHandler btnManageJobs.Click, AddressOf Button_Click
> AddHandler btnSeqOfOper.Click, AddressOf Button_Click
> AddHandler btnViewer.Click, AddressOf Button_Click
> AddHandler btnScfmCalculationTool.Click, AddressOf Button_Click
> AddHandler btnAdminSetup.Click, AddressOf Button_Click
>
> How do I determine which button was clicked? I think I use "sender" but
> do not know how. Can someone help me?
>
> Thank you,
> dbuchanan

In the click event handler...

name = CType(sender, Button).Name
Select Case name
Case "btnManageJobs"
'ManageBlah()
Case "btnSeqOfOper"
'GetSeq
Case "btnViewer"
'GetViewer
Case "btnScfmCalculationTool"
'GetTool
Case Else
'handle it
End Select

A better way might be to use a module-level hashtable with button names and
indexes.

Carl


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Re: How do I determine which button was clicked by dbuchanan

dbuchanan
Sat Nov 12 13:39:53 CST 2005

Carl,

I've never used a hashtable. Do you have an example you could share.

Thank you,
dbuchanan

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Re: How do I determine which button was clicked by JellevanderBeek

JellevanderBeek
Mon Nov 14 05:48:02 CST 2005

I would prefer not to check on the control's name property, since a change
from the control's name will result in a breaking change that will not be
easily detected.

Tim's solution is less error-prone.

"Vagabond Software" wrote:

> "dbuchanan" <dbuchanan52@hotmail.com> wrote in message
> news:1131810063.022402.100780@g44g2000cwa.googlegroups.com...
> >I have added handlers handlers to direct all buttons to one method like
> > this;
> >
> > 'Add handlers for buttons
> > AddHandler btnManageJobs.Click, AddressOf Button_Click
> > AddHandler btnSeqOfOper.Click, AddressOf Button_Click
> > AddHandler btnViewer.Click, AddressOf Button_Click
> > AddHandler btnScfmCalculationTool.Click, AddressOf Button_Click
> > AddHandler btnAdminSetup.Click, AddressOf Button_Click
> >
> > How do I determine which button was clicked? I think I use "sender" but
> > do not know how. Can someone help me?
> >
> > Thank you,
> > dbuchanan
>
> In the click event handler...
>
> name = CType(sender, Button).Name
> Select Case name
> Case "btnManageJobs"
> 'ManageBlah()
> Case "btnSeqOfOper"
> 'GetSeq
> Case "btnViewer"
> 'GetViewer
> Case "btnScfmCalculationTool"
> 'GetTool
> Case Else
> 'handle it
> End Select
>
> A better way might be to use a module-level hashtable with button names and
> indexes.
>
> Carl
>
>
>
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Re: How do I determine which button was clicked by dbuchanan

dbuchanan
Tue Nov 15 08:28:15 CST 2005

Hi Jelle,

How is Tim not using the controls name property? How is Button1,
Button2.... not the button's name? It looks like it to me.


Thank you,
dbuchanan

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Re: How do I determine which button was clicked by Tim

Tim
Tue Nov 15 09:56:45 CST 2005

If it was in quotes it would be. I am comparing references, not names. And I
like Herfried's way the best since it seems cleaner than a whole bunch of
if...elses. I'm not a VB guy so I wasn't sure if you could compare
references through a Select statement.

--
Tim Wilson
.NET Compact Framework MVP

"dbuchanan" <dbuchanan52@hotmail.com> wrote in message
news:1132064895.190754.161500@z14g2000cwz.googlegroups.com...
> Hi Jelle,
>
> How is Tim not using the controls name property? How is Button1,
> Button2.... not the button's name? It looks like it to me.
>
>
> Thank you,
> dbuchanan
>


Top

Re: How do I determine which button was clicked by dbuchanan

dbuchanan
Tue Nov 15 11:09:46 CST 2005

Hi Tim, Jelle, others

Thanks for the input I understand what you mean by references - if the
button name changes the code is broken, but the compiler will indicate
where the break is the Task List.

Herfried's code is the one I chose for the same reasons Tim stated.


Thanks,
dbuchanan

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