<form id="login-form">
     <input type="text" value="user"/>
     <input type="password" value="password"/>

     <input type="button" class="submitButton"/>
</form>

var Form = function(parameters) {
    var properties = {
        form: $('#login-form'),
        submitButton: $('.submitButton', properties.form)
    };
  
    var methods = {
        init: function() {
            $.extend(properties, parameters);

            method.assignEvents();
        },
        assignEvents: function() {
              var $form = properties.form;
              var $submitButton = properties.submitButton;

              $form.click(function(event) { ... });
              
              $submitButton.click(function(event) { ... });
        }
    };
};

var Form = function(parameters) {
    var properties = {
        form: $('#login-form'),
        submitButton: $('.submitButton', properties.form)
    };
  
    var methods = {
        init: function() {
            $.extend(properties, parameters);

            method.assignEvents();
        },
        isValid: function() {
            var isValidForm = true;
            
            ...
            
            return isValidForm;
        },
        assignEvents: function() {
              var $form = properties.form;
              var $submitButton = properties.submitButton;

              $form.click(function(event) { ... });
              
              $submitButton.click(function(event) { 
                   ... 
                   if (!methods.isValid()) { throw {message: 'Form is not valid.'}; }
                   ...
              });
        }
    };
};

   var FormValidator = function(parameters) { ... };