未定义FormPanel "addFormPanel“方法

Question

在web上有很多关于这类代码的示例：

    FormPanel form = FormPanel.wrap(Document.get().getElementById("login"), true); 
    form.setAction("javascript:;");
    form.addFormPanel(new FormPanel() { 
             public void onSubmit(FormSubmitEvent event) { 
              } 
              public void onSubmitComplete(FormSubmitCompleteEvent event) { 
              } 
           });  

但是，addFormPanel方法是未定义的。

我使用的是GWT 2.1.0 BTW

有什么想法吗？

Answer 1

在web上有很多这类代码的示例：

你在哪里见过这样的例子？

我认为，在FormPanel(在更早的(1.6，2.1，甚至在2.3中))中没有这样的方法，如果你想添加onSubmit和/或onSubmitComplete处理程序，只需执行文档中给出的相同操作：

// Add an event handler to the form.
    form.addSubmitHandler(new FormPanel.SubmitHandler() {
      public void onSubmit(SubmitEvent event) {
        // This event is fired just before the form is submitted. We can take
        // this opportunity to perform validation.
        if (tb.getText().length() == 0) {
          Window.alert("The text box must not be empty");
          event.cancel();
        }
      }
    });
    form.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() {
      public void onSubmitComplete(SubmitCompleteEvent event) {
        // When the form submission is successfully completed, this event is
        // fired. Assuming the service returned a response of type text/html,
        // we can get the result text here (see the FormPanel documentation for
        // further explanation).
        Window.alert(event.getResults());
      }
    });