$$('#my-login-screen .login-button').on('click', function () {


var username = $$('#my-login-screen [name="username"]').val();
var password = $$('#my-login-screen [name="password"]').val();

var url = 'SERVER';
var formData = app.form.convertToData('#login-form')
app.request.get(
url,
{
  username: formData['username'],
  password: formData['password']
}
,
function(data){
  alert('Success');

},
function(xhr){
  var response = JSON.stringify(xhr);
  alert(response);
}
)
});