Adding a click handler for an html element?

Answer 1

I haven't tested this, but the general idea is right, and easy enough to extend for more than one target element. You might like to store the elements returned by DOM.getElementById() beforehand to keep things fast. Bear in mind that onPreviewNativeEvent() will be called for every user event, so keep it light.

Event.addNativePreviewHandler(new NativePreviewHandler() {
    public void onPreviewNativeEvent(NativePreviewEvent event) {
        if (Event.as(event).getTypeInt() == Event.ONCLICK &&
            DOM.isOrHasChild(DOM.getElementById("A"), Element.as(event.getEventTarget()))) {
            // Element 'A' was clicked.
        }
    }
}