New hooks for Matt

hooks.js

$('#myForm').on('validation:started', function() {
  // you could have remote rules so you'll want to disable the button while you wait
  $(this).find(':submit').prop('disabled', true);
});

// This happens AFTER the promise has been completed and the notification has been resolved
$('#myForm').on('validation:onsubmission', function(e, validation) {
  // Gives you access to the notification before the submission handler returns
  // You could technically register additional messages here
  //validation.notification
  
  // Just flat out prevent submission
  validation.preventSubmission();
});

// A note:
// The submission handler logic does:
//    Submit the form if both of the following are true:
//      1. preventSubmission() was not explicitly called
//      2. notification.isValid() is true


// For successful responses


// Explicit
$('#myForm').on('validation:success', function(e, continuation) {
  // whatever you need
});

// conventional
var myPolicy = {
  matches: function(continuation) {
    return continuation.success && continuation.form;
  },
  execute: function(continuation) {
    // continuation.form is the actual jquery element
  }
};

// You could also hook into the rendering pipeline and do this as a rendering strategy

Quick note: 'validation:started' should be 'validation:start'