Only allow one checked checkbox in a collection

[Bishman]

Hi,

I need to programmaticall y allow or disallow the selection of multiple
checkboxes on a form . At certain times I only want to allow a single
selection, at other times I may wish to allow multiple. Is there a way of
doing this ?

I dont want to use Radio buttons.....

Thanks,

Jon.

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

"Bishman" <jo************ *@btinternet.co mwrote in message
news:O8******** ******@TK2MSFTN GP02.phx.gbl...

Hi,

I need to programmaticall y allow or disallow the selection of multiple
checkboxes on a form . At certain times I only want to allow a single
selection, at other times I may wish to allow multiple. Is there a way of
doing this ?

I dont want to use Radio buttons.....

Why dont use Radio buttons?
The user expect that a mutually exclusive selection be represented by radio
buttons not checkboxes. If you do not follow this rule your interface will
be weird.
You can do what you want by checking the status of the checkboxes, or the
one that is checked, if another is checked you uncheck the first. You may
found a little issue knowing when (the change of status) was induced by
your code or by the user. but figuring this out is the fun part of the thing
:)

[Bishman]

Yes, I thought that may be the answer.

Many moons ago when I did a bit of VB4 I thought there was a way of grouping
checkboxs to behave like radio buttons ? Maybe my memory is playing tricks
on me.....

I just wondered if there is the same built in functionailty today ( If there
ever was ! )

Thanks,

Jon.


"Ignacio Machin ( .NET/ C# MVP )" <machin TA laceupsolutions .comwrote in
message news:Oz******** ******@TK2MSFTN GP02.phx.gbl...

>
Hi,

"Bishman" <jo************ *@btinternet.co mwrote in message
news:O8******** ******@TK2MSFTN GP02.phx.gbl...

>Hi,

I need to programmaticall y allow or disallow the selection of multiple
checkboxes on a form . At certain times I only want to allow a single
selection, at other times I may wish to allow multiple. Is there a way of
doing this ?

I dont want to use Radio buttons.....

Why dont use Radio buttons?
The user expect that a mutually exclusive selection be represented by
radio buttons not checkboxes. If you do not follow this rule your
interface will be weird.
You can do what you want by checking the status of the checkboxes, or the
one that is checked, if another is checked you uncheck the first. You may
found a little issue knowing when (the change of status) was induced by
your code or by the user. but figuring this out is the fun part of the
thing :)

[=?Utf-8?B?TlJhbw==?=]

Based on your requirements you need to disable or enable check boxes

"Ignacio Machin ( .NET/ C# MVP )" wrote:

>
Hi,

"Bishman" <jo************ *@btinternet.co mwrote in message
news:O8******** ******@TK2MSFTN GP02.phx.gbl...

Hi,

I need to programmaticall y allow or disallow the selection of multiple
checkboxes on a form . At certain times I only want to allow a single
selection, at other times I may wish to allow multiple. Is there a way of
doing this ?

I dont want to use Radio buttons.....

Why dont use Radio buttons?
The user expect that a mutually exclusive selection be represented by radio
buttons not checkboxes. If you do not follow this rule your interface will
be weird.
You can do what you want by checking the status of the checkboxes, or the
one that is checked, if another is checked you uncheck the first. You may
found a little issue knowing when (the change of status) was induced by
your code or by the user. but figuring this out is the fun part of the thing
:)

[Bishman]

I dont need to inhibit which checkbox they are selecting, I just need to
only allow one.

The problem is inverse if I use Radio buttons as I will only be able to
select a single Button, when on occasion I may need to select multiple.....

JB
"NRao" <NR**@discussio ns.microsoft.co mwrote in message
news:2A******** *************** ***********@mic rosoft.com...

Based on your requirements you need to disable or enable check boxes

"Ignacio Machin ( .NET/ C# MVP )" wrote:

>>
Hi,

"Bishman" <jo************ *@btinternet.co mwrote in message
news:O8******* *******@TK2MSFT NGP02.phx.gbl.. .

Hi,

I need to programmaticall y allow or disallow the selection of multiple
checkboxes on a form . At certain times I only want to allow a single
selection, at other times I may wish to allow multiple. Is there a way
of
doing this ?

I dont want to use Radio buttons.....

Why dont use Radio buttons?
The user expect that a mutually exclusive selection be represented by
radio
buttons not checkboxes. If you do not follow this rule your interface
will
be weird.
You can do what you want by checking the status of the checkboxes, or the
one that is checked, if another is checked you uncheck the first. You may
found a little issue knowing when (the change of status) was induced by
your code or by the user. but figuring this out is the fun part of the
thing
:)

[Peter Bradley]

You need to ask yourself why you are designing a form that uses the same
control for two unrelated purposes. You probably need two different
controls (a radio group, and a check box group) that you enable at different
times according to the application's requirements.

Just my 2c. YMMV.
Peter
"Bishman" <jo************ *@btinternet.co mwrote in message
news:%2******** *******@TK2MSFT NGP03.phx.gbl.. .

>I dont need to inhibit which checkbox they are selecting, I just need to
only allow one.

The problem is inverse if I use Radio buttons as I will only be able to
select a single Button, when on occasion I may need to select
multiple.....

JB
"NRao" <NR**@discussio ns.microsoft.co mwrote in message
news:2A******** *************** ***********@mic rosoft.com...

>Based on your requirements you need to disable or enable check boxes

"Ignacio Machin ( .NET/ C# MVP )" wrote:

>>>
Hi,

"Bishman" <jo************ *@btinternet.co mwrote in message
news:O8****** ********@TK2MSF TNGP02.phx.gbl. ..
Hi,

I need to programmaticall y allow or disallow the selection of multiple
checkboxes on a form . At certain times I only want to allow a single
selection, at other times I may wish to allow multiple. Is there a way
of
doing this ?

I dont want to use Radio buttons.....
Why dont use Radio buttons?
The user expect that a mutually exclusive selection be represented by
radio
buttons not checkboxes. If you do not follow this rule your interface
will
be weird.
You can do what you want by checking the status of the checkboxes, or
the
one that is checked, if another is checked you uncheck the first. You
may
found a little issue knowing when (the change of status) was induced by
your code or by the user. but figuring this out is the fun part of the
thing
:)

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

"NRao" <NR**@discussio ns.microsoft.co mwrote in message
news:2A******** *************** ***********@mic rosoft.com...

Based on your requirements you need to disable or enable check boxes

No really, because if he disable all other checkboxes there is no way to
select them back.

Basically he needs radiobuttons :)

[Bishman]

....I think its one of those 'visual' ones !

Thanks for all the responses....
"Peter Bradley" <pb******@uwic. ac.ukwrote in message
news:%2******** ********@TK2MSF TNGP03.phx.gbl. ..

You need to ask yourself why you are designing a form that uses the same
control for two unrelated purposes. You probably need two different
controls (a radio group, and a check box group) that you enable at
different times according to the application's requirements.

Just my 2c. YMMV.
Peter
"Bishman" <jo************ *@btinternet.co mwrote in message
news:%2******** *******@TK2MSFT NGP03.phx.gbl.. .

>>I dont need to inhibit which checkbox they are selecting, I just need to
only allow one.

The problem is inverse if I use Radio buttons as I will only be able to
select a single Button, when on occasion I may need to select
multiple.... .

JB
"NRao" <NR**@discussio ns.microsoft.co mwrote in message
news:2A******* *************** ************@mi crosoft.com...

>>Based on your requirements you need to disable or enable check boxes

"Ignacio Machin ( .NET/ C# MVP )" wrote:
Hi,

"Bishman" <jo************ *@btinternet.co mwrote in message
news:O8***** *********@TK2MS FTNGP02.phx.gbl ...
Hi,

I need to programmaticall y allow or disallow the selection of
multiple
checkboxes on a form . At certain times I only want to allow a single
selection, at other times I may wish to allow multiple. Is there a
way of
doing this ?

I dont want to use Radio buttons.....
Why dont use Radio buttons?
The user expect that a mutually exclusive selection be represented by
radio
buttons not checkboxes. If you do not follow this rule your interface
will
be weird.
You can do what you want by checking the status of the checkboxes, or
the
one that is checked, if another is checked you uncheck the first. You
may
found a little issue knowing when (the change of status) was induced
by
your code or by the user. but figuring this out is the fun part of the
thing
:)

[=?Utf-8?B?RGFsZQ==?=]

Just create client-side or server-side code to check for how many are checked
whenever one is clicked. If the checked count is 1, make the event sender
unchecked.

Psuedocode:

checkbox_onclic k
{
if (Only1Allowed)
if (sender.checked && anyOtherIsCheck ed())
{
sender.checked = false;
showUserWhy();
}
}
--
Dale Preston
MCAD C#
MCSE, MCDBA
"Bishman" wrote:

Hi,

I need to programmaticall y allow or disallow the selection of multiple
checkboxes on a form . At certain times I only want to allow a single
selection, at other times I may wish to allow multiple. Is there a way of
doing this ?

I dont want to use Radio buttons.....

Thanks,

Jon.

[RobinS]

You can always set up an event handler that handles all the checkboxes.
Then when someone checks one and sets it to checked, loop through and
uncheck all the other ones.

Robin S.
--------------------------
"Bishman" <jo************ *@btinternet.co mwrote in message
news:eu******** ******@TK2MSFTN GP02.phx.gbl...

...I think its one of those 'visual' ones !

Thanks for all the responses....
"Peter Bradley" <pb******@uwic. ac.ukwrote in message
news:%2******** ********@TK2MSF TNGP03.phx.gbl. ..

>You need to ask yourself why you are designing a form that uses the same
control for two unrelated purposes. You probably need two different
controls (a radio group, and a check box group) that you enable at
different times according to the application's requirements.

Just my 2c. YMMV.
Peter
"Bishman" <jo************ *@btinternet.co mwrote in message
news:%2******* ********@TK2MSF TNGP03.phx.gbl. ..

>>>I dont need to inhibit which checkbox they are selecting, I just need to
only allow one.

The problem is inverse if I use Radio buttons as I will only be able to
select a single Button, when on occasion I may need to select
multiple... ..

JB
"NRao" <NR**@discussio ns.microsoft.co mwrote in message
news:2A****** *************** *************@m icrosoft.com...
Based on your requirements you need to disable or enable check boxes

"Ignacio Machin ( .NET/ C# MVP )" wrote:

>
Hi,
>
"Bishman" <jo************ *@btinternet.co mwrote in message
news:O8**** **********@TK2M SFTNGP02.phx.gb l...
Hi,

I need to programmaticall y allow or disallow the selection of
multiple
checkboxes on a form . At certain times I only want to allow a
single
selection, at other times I may wish to allow multiple. Is there a
way of
doing this ?

I dont want to use Radio buttons.....
>
>
Why dont use Radio buttons?
The user expect that a mutually exclusive selection be represented by
radio
buttons not checkboxes. If you do not follow this rule your interface
will
be weird.
>
>
You can do what you want by checking the status of the checkboxes, or
the
one that is checked, if another is checked you uncheck the first. You
may
found a little issue knowing when (the change of status) was induced
by
your code or by the user. but figuring this out is the fun part of
the thing
:)
>
>
>
>