java - 防止在uggestbox中输入无效的用户？

我让SuggestBox接受用户输入并使用GWT在弹出窗口中显示suggestions。

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

如何防止用户在没有建议的TextArea中放置字符？

我认为SuggestBox检查已放入TextArea的文本，然后显示建议。但是，如何防止不再匹配的字符呢？

最佳答案

如果您真的需要

   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();
                 }
                }
            });

然后

SuggestBox suggestBox = new SuggestBox(myData,area);