防止在SuggestBox中输入无效的用户？

Question

I have SuggestBox taking user input and displaying suggestions in a popup using GWT.

SuggestBox suggestBox = new SuggestBox(myData, new TextArea());

How can I prevent the user to put characters in the TextArea for which no suggestions exist?

I think the SuggestBox examines the text that has been put into the TextArea , and then displays the suggestions. But how could I prevent characters that do no match anymore?

Answer 1

If you really need that

   TextArea area = new TextArea();
             area.addKeyDownHandler(new KeyDownHandler() {

                @Override
                public void onKeyDown(KeyDownEvent event) {
                    if(event.getNativeKeyCode()==13 ||....){//Add remaining key codes which you dont want.For example i added enter key which keycode is 13.Remove that and add your key codes there. 
                        event.preventDefault();
                 }  
                }
            });

And then

SuggestBox suggestBox = new SuggestBox(myData,area);