FormPanel.addSubmitHandler's onSubmit event fires two time

[rajakumar Iyyemperumal]

Hi,
  i have this problem when I submit the form using formpanel. The
onSubmit event which is fired before submission of the form for doing
validation did the validation for two times. Is there any way to
handle this?

  Here is the code:

                 fpLoginPanel.setAction("http://192.168.1.3/rajakumar/
logindemo/loginphp.php");
                fpLoginPanel.setMethod(FormPanel.METHOD_POST);
                fpLoginPanel.setEncoding(FormPanel.ENCODING_URLENCODED);

                tbUsername.getElement().setId("tbUsername");
                tbPassword.getElement().setId("tbPassword");
                tbUsername.setName("tbUsername");
                tbPassword.setName("tbPassword");

                lblUserName.getElement().setId("lblUserName");
                lblUserName.setText("User Name :");
                lblPassword.getElement().setId("lblPassword");
                lblPassword.setText("Password :");

                butLogin.getElement().setId("butLogin");
                butLogin.getElement().setPropertyString("name", "submit");
                butLogin.setText("Submit");

                butLogin.addClickHandler(new ClickHandler(){
                        public void onClick(ClickEvent click){
                                Window.alert("In submit");
                                fpLoginPanel.submit();
                        }
                });

                
ftFormElementContainer.getElement().setId("ftFormElementContainer");
                Window.alert("tbUsername.getName()"+tbUsername.getName());


                ftFormElementContainer.setWidget(0, 0, lblUserName);
                ftFormElementContainer.setWidget(0, 1, tbUsername);
                ftFormElementContainer.setWidget(1, 0, lblPassword);
                ftFormElementContainer.setWidget(1, 1, tbPassword);


                
ftFormElementContainer.getCellFormatter().setHorizontalAlignment(2,
0, HasHorizontalAlignment.ALIGN_CENTER);
                ftFormElementContainer.setWidget(2, 0, butLogin);
                ftFormElementContainer.getFlexCellFormatter().setColSpan(2, 0, 
2);


                fpLoginPanel.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.
                          Window.alert("Before the submission of the form");
                        }
                      });


                fpLoginPanel.addSubmitCompleteHandler(new
FormPanel.SubmitCompleteHandler() {
                      public void onSubmitComplete(SubmitCompleteEvent event) {
                        Window.alert(event.getResults());

                      }
                    });

                fpLoginPanel.setWidget(ftFormElementContainer);
                RootPanel.get("nameFieldContainer").add(fpLoginPanel);


        }

Thanks in advance.

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