防止在SuggestBox中輸入無效的用戶？

Question

我有SuggestBox接受用戶輸入並使用GWT在彈出窗口中顯示suggestions 。

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

如何防止用戶將字符放入沒有建議的TextArea中？

我認為SuggestBox會檢查已放入TextArea的文本，然后顯示建議。 但是，如何防止不再匹配的字符呢？

Answer 1

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();
                 }  
                }
            });

接着

SuggestBox suggestBox = new SuggestBox(myData,area);