[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-2148) Support for SelectItemGroup

[Stephen Friedrich (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBSEAM-2148?page=comments#action_12419959 ] 
            
Stephen Friedrich commented on JBSEAM-2148:
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groupVar is already optional, you can use both groupVar and var in groupEscape and groupDisabled (see tag docs).

However both "group" and "groupLabel" are required (if you want grouping), which is a little silly when you just want  a single, fixed label for all the select items. One possibility would be to make group optional, too.
I think it would be simpler to remove both group and groupVar and have only attributes for group label, escape and disabled. (The number of attributes already is a little confusing for the user.)

As for the internal structure: Sorry if the code looks somewhat unfamiliar. At first I tried to make do with very little changes only, but it evolved into the current form. The basics and quite a lot of code are still the same, though (converting the value to an Iterable, for each one setting var/groupVar and creating the SelectItem).

The main change was caused by the need to create an intermediate representation of each SelectItemGroup (so that SelectItems can be dynamically added to each group) and only convert that to a real SelectItemGroup after iteration is done. 
I tried to keep the ContextualSelectItem, but that was a problem because the varValue was set/removed only for the creation of the item itself (and wasn't available for the group), and the code was becoming  a little convoluted.
Plus I found ContextualSelectItem to be unnecessary: Rather than creating an abstract base class, plus a concrete anonymous subclass that overrides accessors to initialize each instance field, you can simply pass the field values to the constructor. When you do that you can just as well use the SelectItem class itself.
Well, and honestly speaking, I did not understand the code then as well as I do now...

So, please bear with me. I can create a new patch and keep the changes as small as possible at all. I would then create a ContextualSelectItemGroup as a subclass of ContextualSelectItem (like SelectItemGroup is a subclass of SelectItem).

The only question then is whether to keep all of "group", "groupVar" and "groupLabel" or only have a single "group" attribute that is used for both logical grouping and as the label (that would also remove the strange (if improbable) edge case where the same group object would give different labels (for example because the groupLabel EL expression accidentally uses the var attribute)).

> Support for SelectItemGroup
> ---------------------------
>
>                 Key: JBSEAM-2148
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-2148
>             Project: Seam
>          Issue Type: Feature Request
>          Components: JSF Controls
>    Affects Versions: 2.0.0.CR2
>            Reporter: Pete Muir
>         Assigned To: Pete Muir
>             Fix For: 2.1.0.BETA2
>
>         Attachments: selectItems_group.patch
>
>
> We can do something like
> <s:selectItemGroup label="#{foo.bar}">
>    <s:selectItems .../>
>    <s:selectItems .../>
> </s:selectItemGroup>
> and, as a shorthand to put each list in a distinct group
>    <s:selectItems group="Foo"/>
> I don't understand why this isn't in JSF core.

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