/**
 * Process the submit event from the login form.
 */
function LoginFormSubmitHandler() {
  var loginFormPasswordElement;
  var loginFormUserElement;

  loginFormPasswordElement = document.getElementById("login-form-password");
  loginFormUserElement = document.getElementById("login-form-user");

  try {
    login(loginFormPasswordElement.value, loginFormUserElement.value);
  } catch(e) {
    loginFormPasswordElement.classList.add("invalid");
    loginFormUserElement.classList.add("invalid");
  }
}