Fast Navigation Library that requests just the page main-container for common pages

fastnav.js

// fastnav.js
// Created by Caleb Everett
// Copyright (c) 2015 Caleb Everett.
// Licensed under MIT License
!function() {
    var $mc = $('#main-container'),
        requestViaAjax = function(url) {
            $.blockUI();
            $.ajax({
                type: 'GET',
                url: url,
                success: function(response) {
                    $mc.html(
                        $.parseHTML(response).find(function(i) {
                            return i.id == 'main-container';
                        })
                    );
                },
                error: function(xhr, status, err) {
                    alert(`${status}: ${xhr.responseText}`);
                },
                complete: function(xhr, status) {
                    $.unblockUI();
                }
            });
        };

    $(document).on('popstate.fastnav', function() {
        requestViaAjax(location.href);
    });

    $(document).on('click.fastnav', '.fastnav', function(e) {
        e.preventDefault();

        history.pushState(null, '', e.target.href);
        requestViaAjax(e.target.href);
    });
}();

fastnav2.js

// fastnav2.js
// Created by Caleb Everett
// Copyright (c) 2015 Caleb Everett.
// Licensed under MIT License
function FastNav2(linkSelector, mainContainerId) {
    var $mc = $(mainContainerId),
        requestViaAjax = function(url) {
            $.blockUI();
            $.ajax({
                type: 'GET',
                url: url,
                success: function(response) {
                    $mc.html(
                        $.parseHTML(response).find(function(i) {
                            return i.id == 'main-container';
                        })
                    );
                },
                error: function(xhr, status, err) {
                    alert(`${status}: ${xhr.responseText}`);
                },
                complete: function(xhr, status) {
                    $.unblockUI();
                }
            });
        };

    $(document).on('popstate.fastnav2', function() {
        requestViaAjax(location.href);
    });

    $(document).on('click.fastnav2', linkSelector, function(e) {
        e.preventDefault();

        history.pushState(null, '', e.target.href);
        requestViaAjax(e.target.href);
    });
}