jQuery inputValidation plugin (not finished yet)

jquery.inputvalidation.js

(function($) {

    $.fn.inputValidation = function(method) {

        var methods = {

            init : function(options) {
                this.inputValidation.settings = $.extend({}, this.inputValidation.errorMessage, options);
                return this.each(function() {
                    var $element = $(this), // reference to the jQuery version of the current DOM element
                         element = this;      // reference to the actual DOM element
                });
            },


            // isRequired method to check if the input is not empty.
            isRequired: function(message) {
                console.log('message: ' + message);
                if(!message || message === undefined) {
                    message = this.inputValidation.errorMessage.required;
                    console.log('message: ' + message);
                }
                $(this).focus(function() {
                    helpers.removeError($(this));
                    helpers.removeError($(this));                    
                });

                $(this).blur( function() {
                    if($(this).val() === '') {
                        $(this).addClass('error');
                        $(this).after('<p class="error error_message">'+message+'</p>').fadeIn('slow');        
                    }
                });
            },

            // isNumber method to check if it is an number in the input field
            isNumber: function(message) {
                /** Default message **/
                if(!message || message === undefined) {
                    message = this.inputValidation.errorMessage.number;
                    console.log('message: ' + message);
                }
                $(this).focus(function() {
                    helpers.removeError($(this));                                       
                });

                $(this).blur( function() {
                    var inputVal = $(this).val();
                    if(inputVal && !$.isNumeric(inputVal)) {
                        $(this).addClass('error');
                        $(this).after('<p class="error error_message">'+message+'</p>').fadeIn('slow');        
                    } else {
                        helpers.valid($(this));
                    }
                });
            },


        };

        var helpers = {
            removeError: function(element) {
                console.log('element: ', element);
                // Remove error class from input and remove error message if input is focused
                element.removeClass('error');
                element.removeClass('valid');
                element.next().remove();           
            },
            valid: function(element) {
                console.log('element: ', element);
                // Remove error class from input and remove error message if input is focused
                element.addClass('valid');
            },
        };

        if (methods[method]) {
            return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
        } else if (typeof method === 'object' || !method) {
            return methods.init.apply(this, arguments);
        } else {
            $.error( 'Method "' +  method + '" does not exist in inputValidation plugin!');
        }

    };

    $.fn.inputValidation.errorMessage = {
        foo: 'googlasdnklansdl;as;ldle',
        required: 'Dit veld is een verplicht',
        number: 'Dit zij geen cijfers',
    };

    $.fn.inputValidation.settings = {};


})(jQuery);