The easiest is to use a ValueListBox but it works a bit differently from a
ListBox (API wise; for the same generated DOM).
The reason ListBox is not a HasValue is that some people would like
getValue to return the selected index while others would prefer the
selected option's value, and a few would want an Option class with a
getValue(), getLabel() and
getIndex():
https://code.google.com/p/google-web-toolkit/issues/list?can=1&q=ListBox+HasValue
If you can't use a ValueListBox, is relatively easy to make an HasValue
around a ListBox; ask if you need it and can't come to doing it yourself.
On Friday, February 1, 2013 9:46:08 PM UTC+1, BM wrote:
>
> I have a custom class which is used to assign single handler to all of my
> UI text fields.
>
> Custom Class Watcher:
> =================
>
> private ValueChangeHandler<String> reusableChangeHandler;
>
> public void registerHandlers(HasValue<String> element) {
>
> element.addValueChangeHandler(reusableChangeHandler);
>
> }
>
> The idea here is I can assign all of my textfields same valueChangeHandler.
>
> myView Class:
>
> ===========
>
> TestBox myTextBox = new TextBox();
>
> Watcher.registerHandlers(myTextBox);
>
> But it doesn't work for ListBox. How do I make a overloaded method to
> accomodate Listbox?
>
> Basically I want to do something when any of my UI elements value changes
> in a center location.
>
>
>
>
>
>
>
>
>
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