Actually the data to build the select list is stored in a database. We have
a function that when passed a column value (the code type) will return a
List<SelectItem>. So the only thing I need to accomplish is to get this
String (the codeType) to the method from the XHTML (do not want to put in
the backing bean).
thanks
L
Simon Kitching-3 wrote:
>
> Ok, I see what you are trying to do.
>
> I believe what you want to be able to specify that a particular
> f:selectItems tag gets its data from one part of your reference data and
> a different f:selectItems tag gets its data from a different part of
> your reference data without having to write custom methods to access the
> various reference data parts.
>
> If this is the case then f:param is definitely not what you are looking
> for.
>
> JSF el expressions support properties that are of type Map. So if
> #{carBean.refdata}
> is an object of type Map then
> #{carBean.refdata.vehicleTypes}
> will call
> carBean.getRefdata().get("vehicleTypes");
>
> In other words, if you store your reference data into a real map, or
> alternately write a custom class that implements the Map interface, then
> you should be able to do what you want.
>
> If this isn't sufficient for you for some reason then you *can* persuade
> MyFaces to allow functions in EL expressions. However the code will be
> MyFaces-specific. In short, you need to write a class that implements
> javax.servlet.jsp.el.FunctionMapper, then subclass
> org.apache.myfaces.el.ValueBindingImpl to register an instance of your
> custom FunctionMapper. Much better to avoid that if you can.
>
> Regards,
>
> Simon
>
> Lisa wrote:
>> We need to build a pulldowns (select list boxes) on the front end (select
>> lists, check boxes etc) and do not want to write a getter for each one.
>> We
>> simply want a generic method that we call throughout the application
>> called
>> "getList(String s).
>>
>> String s is a key into a types table that, when used for the query will
>> return everything needed in the list.
>>
>> I thought this would be the simplest approach instead of having to write
>> a
>> method that sets a string and passes it to a function that builds
>> List<SelectItem>.
>>
>> It would be better to simply have the String s in the XHTML, that calls 1
>> method (used throughout the app) that will build and return the
>> List<SelectItem> based on the string (param) in the XHTML.
>>
>> at first look it seems like <f:param> would work but I can not seem to
>> get
>> this to work to pass any params to my backing bean.
>>
>>
>> L
>>
>>
>>
>> Simon Kitching-3 wrote:
>>> I don't think you're going to be able to do this; it isn't natural JSF
>>> style. JSF el expressions don't support parameters.
>>>
>>> You should look at other approaches to resolve whatever your problem is.
>>>
>>> Regards,
>>>
>>> Simon
>>>
>>> Lisa wrote:
>>>> I looked at the docs on this tag <f:param> but there were no examples
>>>> on
>>>> how
>>>> to pass a String param to the getters in the value="#{bean.getMethod}"
>>>>
>>>> I want to pass a string to getMethod(String s) listed above. If you
>>>> have
>>>> any specific examples on how to do this, it would be greatly
>>>> appreciated.
>>>>
>>>>
>>>> L
>>>>
>>>>
>>>>
>>>> Lisa wrote:
>>>>> I want to build a SelectItem list by calling a method in my backing
>>>>> bean,
>>>>> but I want to be able to pass the backing bean a String (from the
>>>>> XHTML).
>>>>>
>>>>>
>>>>> ---
>>>>> This is what I currently have:
>>>>>
>>>>> <h:selectOneListbox
>>>>> rendered="#{carBean.listMode}"
>>>>> id="idSelectVehicleType"
>>>>> value="#{carBean.vehicleType}"
>>>>> size="1">
>>>>>
>>>>> <f:selectItems id="idCarBeanTypeList"
>>>>> value="#{carBean.vehicleTypeList}"/>
>>>>> </h:selectOneListbox>
>>>>>
>>>>> where vehicleTypeList is a method in CarBean.getVehicleTypeList()
>>>>>
>>>>> ---
>>>>> So I want to change the method signature to accept a String like so:
>>>>>
>>>>> CarBean.getVehicleTypeList(String s)
>>>>>
>>>>> and in the XHTML pass String s to CarBean.getVehicleTypeList(String
>>>>> s).
>>>>>
>>>>> Is this possible?
>>>>> value="#{carBean.vehicleTypeList("myString")}"
>>>>>
>>>>>
>>>>> thanks
>>>>>
>>>>>
>>>>> Lisa
>>>>>
>>>
>>>
>>
>
>
>
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