GWT 中 DOM 元素的处理程序 [英] Handler on DOM elements in GWT

问题描述

我想在按钮元素上添加处理程序，我已按如下方式实现它.请帮助我解决此代码中的错误.我不想直接在按钮小部件上添加处理程序.

I want to add the handler on the buttonelement and i have implemented it as follow. Please help me in resolving the error in this code. I do not want to add handler directly on the button widget.

        Button button = new Button("Click");
        Element buttonElement = button.getElement();

        Event.setEventListener(buttonElement, new EventListener() {

            @Override
            public void onBrowserEvent(Event event) {

                String string = event.getType();

                if(string.equalsIgnoreCase("click")) {
                    System.out.println("CLICK");
                }
            }
        });

        Event.sinkEvents(buttonElement, Event.ONCLICK);

推荐答案

您的代码是正确的，您可能在接收器事件后添加了小部件.您必须在接收器事件之前添加小部件.举个例子:

Your code is correct, you might added widget after sink event. you have to add widget before sink event. just example:

Button  button=new Button("Click");
    Element buttonElement = button.getElement();
      RootPanel.get().add(button);
    Event.sinkEvents(buttonElement, Event.ONCLICK);
    Event.setEventListener(buttonElement, new EventListener() {

        @Override
        public void onBrowserEvent(Event event) {
            System.out.println("ok");
             if(Event.ONCLICK == event.getTypeInt()) {
                 Window.alert("ok");
                  System.out.println("CLICK");
             }

        }
    });

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