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Posted to users@wicket.apache.org by Dan12321 <we...@centrum.cz> on 2012/07/03 19:09:54 UTC
chekbox - allow only 5 selected
Hi,
I have CheckGroup<User> group = new CheckGroup<User>("usersGroup", list);
and in repeater I add checkbox: item.add(new Check<User>("checkboxUser",
group));
I have got 20 checkboxes, but I want to allow only 5 checkboxes select. When
will be selected more than 5 checkboxes, it shows error (in feedback).
I want to check this when the checkbox is selected (not after submitting
form).
Could help me, how can I do it?
Thanks.
--
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Re: chekbox - allow only 5 selected
Posted by Jeremy Thomerson <je...@wickettraining.com>.
On Tue, Jul 3, 2012 at 12:09 PM, Dan12321 <we...@centrum.cz> wrote:
> Hi,
>
> I have CheckGroup<User> group = new CheckGroup<User>("usersGroup", list);
> and in repeater I add checkbox: item.add(new Check<User>("checkboxUser",
> group));
>
> I have got 20 checkboxes, but I want to allow only 5 checkboxes select.
> When
> will be selected more than 5 checkboxes, it shows error (in feedback).
> I want to check this when the checkbox is selected (not after submitting
> form).
>
It will require JavaScript, so I'd just make it an entirely client-side
validation. Of course, you'll still want the server-side validation to
mirror it for when the form is submitted - potentially with forced values
or JS disabled.
--
Jeremy Thomerson
http://wickettraining.com
*Need a CMS for Wicket? Use Brix! http://brixcms.org*
Re: chekbox - allow only 5 selected
Posted by Martin Grigorov <mg...@apache.org>.
On Tue, Jul 3, 2012 at 9:24 PM, Alexander Cherednichenko
<le...@gmail.com> wrote:
> Hi!
>
> As the first A in AJAX stands for Asynchronous, you may hit weird results
> with this solution, especially on slow internet connection. Which means
> that no one guarantees that if user clicks checkbox1 and then checkbox2
> answers would arrive in such a manner.
Wicket serializes the Ajax requests both at the client and at the
server side, so there is a guarantee that request1 is processed before
request2.
You can disable the client side queueing by overriding ajax behavior's
#getAjaxChannel() method though.
>
> What I would do in this case - I would just write a very simple JQuery
> callback which would listen to checkbox check/uncheck events and would
> disable remaining checkboxes once 5 are selected, plus show warning. It is
> synchronous, immediate, and the rule - max 5 - seems to be easy to employ
> on the client side.
>
> Surely we need to leave the check for 'max 5' in the onsubmit validator as
> we want it to be independent of the javascript.
I agree that client side checks will be much better for the user experience.
>
> Regards,
> Alex.
>
> 2012/7/3 Martin Grigorov <mg...@apache.org>
>
>> You can assign AjaxFormChoiceComponentUpdatingBehavior to the group
>> and check its model object's size in #onUpdate()
>>
>> But this will fire Ajax requests for each and every click on the
>> checkboxes.
>>
>> On Tue, Jul 3, 2012 at 7:09 PM, Dan12321 <we...@centrum.cz> wrote:
>> > Hi,
>> >
>> > I have CheckGroup<User> group = new CheckGroup<User>("usersGroup", list);
>> > and in repeater I add checkbox: item.add(new Check<User>("checkboxUser",
>> > group));
>> >
>> > I have got 20 checkboxes, but I want to allow only 5 checkboxes select.
>> When
>> > will be selected more than 5 checkboxes, it shows error (in feedback).
>> > I want to check this when the checkbox is selected (not after submitting
>> > form).
>> > Could help me, how can I do it?
>> >
>> > Thanks.
>> >
>> > --
>> > View this message in context:
>> http://apache-wicket.1842946.n4.nabble.com/chekbox-allow-only-5-selected-tp4650340.html
>> > Sent from the Users forum mailing list archive at Nabble.com.
>> >
>> > ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>> > For additional commands, e-mail: users-help@wicket.apache.org
>> >
>>
>>
>>
>> --
>> Martin Grigorov
>> jWeekend
>> Training, Consulting, Development
>> http://jWeekend.com
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>> For additional commands, e-mail: users-help@wicket.apache.org
>>
>>
>
>
> --
> Alexander Cherednichenko
>
> [ the only way out is the way up ]
--
Martin Grigorov
jWeekend
Training, Consulting, Development
http://jWeekend.com
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Re: chekbox - allow only 5 selected
Posted by Alexander Cherednichenko <le...@gmail.com>.
Hi!
As the first A in AJAX stands for Asynchronous, you may hit weird results
with this solution, especially on slow internet connection. Which means
that no one guarantees that if user clicks checkbox1 and then checkbox2
answers would arrive in such a manner.
What I would do in this case - I would just write a very simple JQuery
callback which would listen to checkbox check/uncheck events and would
disable remaining checkboxes once 5 are selected, plus show warning. It is
synchronous, immediate, and the rule - max 5 - seems to be easy to employ
on the client side.
Surely we need to leave the check for 'max 5' in the onsubmit validator as
we want it to be independent of the javascript.
Regards,
Alex.
2012/7/3 Martin Grigorov <mg...@apache.org>
> You can assign AjaxFormChoiceComponentUpdatingBehavior to the group
> and check its model object's size in #onUpdate()
>
> But this will fire Ajax requests for each and every click on the
> checkboxes.
>
> On Tue, Jul 3, 2012 at 7:09 PM, Dan12321 <we...@centrum.cz> wrote:
> > Hi,
> >
> > I have CheckGroup<User> group = new CheckGroup<User>("usersGroup", list);
> > and in repeater I add checkbox: item.add(new Check<User>("checkboxUser",
> > group));
> >
> > I have got 20 checkboxes, but I want to allow only 5 checkboxes select.
> When
> > will be selected more than 5 checkboxes, it shows error (in feedback).
> > I want to check this when the checkbox is selected (not after submitting
> > form).
> > Could help me, how can I do it?
> >
> > Thanks.
> >
> > --
> > View this message in context:
> http://apache-wicket.1842946.n4.nabble.com/chekbox-allow-only-5-selected-tp4650340.html
> > Sent from the Users forum mailing list archive at Nabble.com.
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> > For additional commands, e-mail: users-help@wicket.apache.org
> >
>
>
>
> --
> Martin Grigorov
> jWeekend
> Training, Consulting, Development
> http://jWeekend.com
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>
--
Alexander Cherednichenko
[ the only way out is the way up ]
Re: chekbox - allow only 5 selected
Posted by Martin Grigorov <mg...@apache.org>.
You can assign AjaxFormChoiceComponentUpdatingBehavior to the group
and check its model object's size in #onUpdate()
But this will fire Ajax requests for each and every click on the checkboxes.
On Tue, Jul 3, 2012 at 7:09 PM, Dan12321 <we...@centrum.cz> wrote:
> Hi,
>
> I have CheckGroup<User> group = new CheckGroup<User>("usersGroup", list);
> and in repeater I add checkbox: item.add(new Check<User>("checkboxUser",
> group));
>
> I have got 20 checkboxes, but I want to allow only 5 checkboxes select. When
> will be selected more than 5 checkboxes, it shows error (in feedback).
> I want to check this when the checkbox is selected (not after submitting
> form).
> Could help me, how can I do it?
>
> Thanks.
>
> --
> View this message in context: http://apache-wicket.1842946.n4.nabble.com/chekbox-allow-only-5-selected-tp4650340.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
--
Martin Grigorov
jWeekend
Training, Consulting, Development
http://jWeekend.com
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