Re: What is the best practice for coding addChangeHandler in Gwt?

You have already answered your own question.

As you only need exactly on change handler registered, you can not put the handler registration code inside a method that is triggered by a button. Normally you add handlers either in the constructor of your widget or in the widgets onLoad() method (you need to override it).

As it seems like you use UiBinder then you normally just use @UiHandler, e.g.

@UiHandler

void onTestListBoxChanged(ChangeEvent event) {

  // do something

}

GWT will then generate the event registration code for you.

-- J.

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