如何在GWT中的當前視圖（onUnLoad）之前設置以前的值？

Question

我已經存儲在Load上的值，之後，我改變了部件屬性，再次卸載之前我想設置以前存儲的值，我該怎麼辦？ widget.addAttachHandler（EventHandler）對我很有幫助。

Answer 1

只是帶有事件監聽器的design your own widget。並在您的自定義小部件類ovveride中加載和卸載方法。

// This method is called when a widget is attached to the browser's document 
    @Override 
    protected void onLoad() { 
    setEventListener(inputElem, this); 
    // ... 
    } 


    // This method is called when a widget is detached from the browser's document 
    @Override protected void onUnload() { 
    // Clear out the inputElem's event listener (breaking the circular 
    // reference between it and the widget); avoid memory leaks 
    setEventListener(inputElem, null); 
    // ... 
    }