Login JS

var handleLogin = function() {
        $('.login-form').validate({
                errorElement: 'span', //default input error message container
                errorClass: 'help-block', // default input error message class
                focusInvalid: false, // do not focus the last invalid input
                rules: {
                    username: {
                        required: true
                    },
                    password: {
                        required: true
                    }
                },

                messages: {
                    username: {
                        required: "Username harus diisi."
                    },
                    password: {
                        required: "Password harus diisi."
                    }
                },

                invalidHandler: function (event, validator) { //display error alert on form submit
                    $('.alert-danger', $('.login-form')).show();
                },

                highlight: function (element) { // hightlight error inputs
                    $(element)
                        .closest('.form-group').addClass('has-error'); // set error class to the control group
                },

                success: function (label) {
                    label.closest('.form-group').removeClass('has-error');
                    label.remove();
                },

                errorPlacement: function (error, element) {
                    error.insertAfter(element.closest('.input-icon'));
                },

                submitHandler: function (form) {
                    form.submit();
                }
            });

            $('.login-form input').keypress(function (e) {
                if (e.which == 13) {
                    if ($('.login-form').validate().form()) {
                        $('.login-form').submit();
                    }
                    return false;
                }
            });
    }