Hi again,
I have been having a look at the custom converters and have written one that
should handle any potential nulls. I set the value of the selectOneMenu to
be #{BackingBean.mainObject} and the custom converter returns the ID of the
nested bean if it exists, otherwise it returns null. This seems to work OK,
although it currently has quite a lot of overhead; it is currently hitting
the db on refresh each time to do the 'getAsObject' part of the converter.
Bear in mind of course I probably haven't got it quite right yet!
Now the converter is there I do not have the error created when the nested
bean is null, however none of the action listeners on my page are being
fired at all. As I mentioned previously the action listeners are completely
independent of the selectOneMenu, it's simply that if I do not set the value
of the menu the listeners will fire.
The action listeners are in a panelGrid, an example of which is as follows:
<h:commandLink actionListener="#{BackingBean.removeItem}">
<h:graphicImage url="image/icon/navigate_minus.png" alt="remove"/>
</h:commandLink>
My selectOneMenu is in a separate panel grid and is set out as follows:
<h:selectOneMenu id="industryList" value="#{BackingBean.mainObject}">
<f:converter converterId="xxxx.Converter" />
<f:selectItem itemValue="0" itemLabel="(#{webtext.select})"/>
<f:selectItems value="#{BackingBean.list}"/>
</h:selectOneMenu>
The list returned from the backing bean returns an array list of
SelectItems. This code is contained within an embedded jsp page within a
panelTabbedPane using the following syntax:
<f:subview id="tabName">
<c:import url="tabcontent/pagename.jsp"/>
</f:subview>
This seems to be quite a strange issue to me though hopefully the answer
will be a lot more straightforward than it currently seems. I would be
grateful of any pointers whatsoever!
Many thanks, Carl
Mike Kienenberger wrote:
>
> I don't see an action listener in the page code you posted.
> Make sure you have an h:messages tag (or two) or equivalent on your
> page to report validation errors. Make sure you catch global errors
> as well as specific ones.
>
> convertNumber should work, although it only returns either a Long or a
> Double value, depending on the number parsed. There's another number
> converter in the sandbox that will allow you to specify the type.
>
> The way others have handled this is to write specific converters for
> our Entity types (Hibernate or Cayenne) rather than for the id value.
>
> Are you allowed to arbitrarily change the
> BackingBean.object.subObject.id value in Hibernate? Is this really
> doing what you want it to do? I use Cayenne, so I can't say, but
> normally I want to set a variable to the data object returned, not set
> an id on an existing data object.
>
>
>
> On 9/20/06, CarlHowarth <[EMAIL PROTECTED]> wrote:
>>
>> Hi Mike,
>>
>> I didn't have a converter within the selectOneMenu - the ID of the
>> selectItems is simply an integer. I'm a bit new to JSF - I have tried
>> adding
>> a convertnumber within the code.... this has stopped the error mentioned
>> below, however this has stopped invoking the actionListener even when the
>> data is populated. Do I need to add any further info to the converter, or
>> look into writing my own?
>>
>> The menu is as follows:
>>
>> <h:selectOneMenu id="industryList"
>> value="#{BackingBean.object.subObject.id}">
>> <f:convertNumber />
>> <f:selectItem itemValue="0" itemLabel="(#{webtext.select})"/>
>> <f:selectItems value="#{BackingBean.clientIndustryList}"/>
>> </h:selectOneMenu>
>>
>> There are no errors showing up even though the actionListener is being
>> completely disregarded.
>>
>> Thanks, Carl
>>
>>
>>
>> Mike Kienenberger wrote:
>> >
>> > Did you register an appropriate converter for the data types of your
>> > select items?
>> >
>> > On 9/20/06, CarlHowarth <[EMAIL PROTECTED]> wrote:
>> >>
>> >> Hi,
>> >>
>> >> I have a strange issue with a JSF page I am working on...
>> >>
>> >> When I set the value of a selectOneMenu component to a property of my
>> >> backing bean, my action listeners stop being fired. If I set the value
>> of
>> >> my
>> >> selectOneMenu to a property of an object stored on my backing bean
>> they
>> >> work
>> >> again. The data is being returned using Hibernate and I want to
>> perform
>> >> some
>> >> logic in the backing bean in case one of the properties is null, since
>> >> setting the menu's value to a property that would ordinarily throw a
>> >> NullPointerException gives this error:
>> >>
>> >> ERROR
>> >> org.apache.myfaces.shared_impl.renderkit.html.HtmlRendererUtils(355) -
>> >> Error finding Converter for component with id ....
>> >>
>> >> ...and that too prevents the action listeners from being triggered.
>> >>
>> >> Other than this I am not getting any errors and am a bit stuck in all!
>> >>
>> >> The app uses myfaces 1.1.4 and tomahawk 1.1.3 - the menu component and
>> >> command links that activate the action events are in a panelTab.
>> >>
>> >> Has anybody had a similar issue, or can anyone please point me in the
>> >> right
>> >> direction?
>> >>
>> >> Many thanks in anticipation, Carl
>> >> --
>> >> View this message in context:
>> >>
>> http://www.nabble.com/Strange-actionListener-component-value-problem-tf2304734.html#a6406078
>> >> Sent from the MyFaces - Users mailing list archive at Nabble.com.
>> >>
>> >>
>> >
>> >
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Strange-actionListener-component-value-problem-tf2304734.html#a6409626
>> Sent from the MyFaces - Users mailing list archive at Nabble.com.
>>
>>
>
>
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