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From "Martin Marinschek" <martin.marinsc...@gmail.com>
Subject Re: Checkbox and required=true
Date Tue, 04 Mar 2008 13:31:09 GMT
Hi Michael,

you are on the right track - the required==true flag will not help in
the case of the checkbox, as for checkboxes, JSF will _always_ set a
value (either true or false, due to the problems you mentioned above -
there is no way to distinguish between false and value not set at
all...).

what you can do instead is set the validator="#{myBb.validator}"
attribute and validate in this method accordingly (or, as you said,
write a new validator).

regards,

Martin

On 2/27/08, Michael Heß <mhe@ordix.de> wrote:
> Hi List,
>
> now that I have spent several hours trying to figure it out on my own, I'm
> giving this list a try.
>
> What I want to do is rather basic: I want to have a mandatory checkbox in
> my view. So if the user wants to continue working with the application he
> must first tick the box.
>
> So what I came up with was to use the required="true" on the
> h:selectBooleanCheckbox . Unfortunately this does not work. As I tried to
> find out what goes wrong I gave h:inputText a try, and it worked as
> expected, i.e. the form was considered invalid as long as the textbox was
> empty. So something is fishy about the checkbox...
>
> OK, so I remember back from the struts days, that checkboxes are tricky
> because they do not submit any value at all (not even an empty one) when
> unchecked. Searching some more, I found a rather interesting discussion in
> http://issues.apache.org/jira/browse/MYFACES-1467. Although the main
> problem is about validators not running, the issue that required="true"
> gets ignored in case the component does not create a http parameter at
> all, is discussed at well. To the end of that issue it first seemed like a
> patch was supplied, but then again several problems popped up, and someone
> suspects that it's a spec issue.... frankly - i`m at a loss here. :-)
>
> So, what is the right approach for this behaviour? Create a
> "MandatoryCheckboxValidator" and attach it to the checkboxes? Maybe
> someone else had the problem already and can give me a hint how to
> proceed?
>
> Thanks and bye,
> Michael
>
>
> --
> Michael Heß
> Senior Consultant
>
> ORDIX AG
> Westernmauer 12-16
> 33098 Paderborn
>
> http://www.ordix.de
> Tel.: 05251 / 10 63  0
> Fax : 05251 / 10 63 99
> Mob :  0163 /673 49 43
>
> ORDIX AG - Aktiengesellschaft für Softwareentwicklung, Schulung, Beratung
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> Vorsitzender des Aufsichtsrates: Prof. Dr. Hermann Johannes
> Vorstand: Wolfgang Kögler (Vorsitzender), Benedikt Georgi, Christoph
> Lafeld, Axel Röber
> Firmensitz: Westernmauer 12 - 16, 33098 Paderborn, Tel: 05251 / 1063-0,
> Fax: 0180 / 1 67 34 90
> Amtsgericht Paderborn, HRB 2941, Ust-IdNr.DE 126333767, Steuernummer:
> 339/5866/0142
>
>
>


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