GWT event handling. Needs to block the event till form submit finish - gwt

Question

I'm developing a wizard by using GWT. In the Wizard first page i have a form component to upload the file. In the wizard panel i have the next button when i press the next button the validation method will be triggered if the validation is passed then i'm calling the form.submit(); but before form.submit() handler starts the functionality the validation methods completes it. After it completes the validation method only the form submit it's really taking part. How can i controll this event behavior, when i submit the form using form.submit() the remaining actions has to wait till this form returns to it's handler.
Advance Thanks.

Answer 1

Assuming you have a FormPanel:
FormPanel form = new FormPanel();
You can add a handler:
form.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() {
public void onSubmitComplete(SubmitCompleteEvent event) {
// TODO: Do the next step in the wizard
// Use event.getResults() to get the text of the response
}
});

Answer 2

Write a boolean which you'll set to true once the validation is complete. Then start a timer that waits on that boolean. But consider using events and callbacks for repeated use. Using timer will make your code messy if you overuse them.
#UiHandler("submit")
protected void onSubmit() {
validated=false;
validate();
Scheduler.get().scheduleFixedDelay(new RepeatingCommand() {
public boolean execute() {
if (validated) {
if (validationSucceeded()) {
submit();
}
return false;
}
return true;
}
}, 250);
}
private boolean validated = false;
private void validate() {
// do validation
validated=true;
}