On Tue, Jul 3, 2012 at 9:24 PM, Alexander Cherednichenko
<lex...@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 <mgrigo...@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 <wee...@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.
>> >
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>>
>>
>>
>> --
>> Martin Grigorov
>> jWeekend
>> Training, Consulting, Development
>> http://jWeekend.com
>>
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>>
>
>
> --
> Alexander Cherednichenko
>
> [ the only way out is the way up ]
--
Martin Grigorov
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Training, Consulting, Development
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