Re: How to implement HasValue for ListBox?

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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