Re: [ovirt-devel] GWT/Frontent - Looking for convinient way to seperate the "data" from "presentation" in combo boxes
Hi Yair, sorry for my late response.
As Lior mentioned, ListModelListBox accepts Renderer that is passed to
ValueListBox constructor. The purpose of a Renderer is to create user
presentable string for given item (T). The fact that getValue() returns
T rather than String is expected, as T is the type of item the list box
works with.
The reason why <select> tag for ListModelListBox has options with same
"data" and "presentation" strings, is because ValueListBox (parent of
ListModelListBox) uses this to add new item:
getListBox().addItem(renderer.render(value));
which is the same thing as you would do:
listBox.insertItem(renderValue, renderValue, INSERT_AT_END);
If we want to modify this behavior, we'll need to either hack or replace
ValueListBox backing implementation.
Vojtech
----- Original Message -----
From: "Lior Vernia" <lvernia(a)redhat.com>
To: "Yair Zaslavsky" <yzaslavs(a)redhat.com>
Cc: devel(a)ovirt.org
Sent: Sunday, June 15, 2014 8:16:35 AM
Subject: Re: [ovirt-devel] GWT/Frontent - Looking for convinient way to seperate the
"data" from "presentation" in
combo boxes
Hi Yair,
I think this is exactly what happens in our GUI in most list boxes.
The class ListModelListBox<T> renders the options for display using a
Renderer passed to its constructor, but getValue() returns the actual
selected item of type T rather than the String (and this in turn is what
is set as the selected item in the backing ListModel<T>).
Does this answer your question?
Yours, Lior.
On 14/06/14 11:20, Yair Zaslavsky wrote:
> HI all,
> If you look at this link -
>
> http://www.w3schools.com/tags/tag_select.asp
>
> It shows a selection in which you have a differentiation between the
> displayable value, and the "data" value (which will be sent as the
> "selected value").
>
> How can I do the same in GWT? At ListModel for example I saw methods only
> to add items.
>
>
> Thanks,
> Yair
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