在SuggestBox中防止無效的用戶輸入？

Question

我有SuggestBox在使用GWT的彈出窗口中獲取用戶輸入並顯示suggestions。

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

如何防止用戶把字符對於沒有建議存在TextArea？

我認爲SuggestBox檢查已放入TextArea的文本，然後顯示建議。但是我怎麼能阻止不匹配的角色呢？

Answer 1

如果你真的很需要那

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(); 
       } 
       } 
      }); 

然後

SuggestBox suggestBox = new SuggestBox(myData,area);