main.js

init();

function init() {
    hideMobileNavOnClick();
}

function hideMobileNavOnClick() {
    var $ = jQuery,
        menu = $('.main-navigation'),
        inlineLinks = menu.find('a[href*="#"]');

    if (inlineLinks.length !== 0) {
        inlineLinks.each(function() {
            var link = $(this),
                linkHref = link.attr('href'),
                linkHash = linkHref.substr(linkHref.indexOf("#")),
                // Search ID or Name attributes
                target = $(linkHash).add('[name="' + linkHash.substr(1) + '"]');

            if (target.length !== 0) {
                // Enable keyboard support
                target.attr('tabindex', '-1');

                link.on('click', function(event) {
                    var menuBtn = menu.find('.menu-toggle');

                    // If mobile
                    if (!menuBtn.is(':hidden')) {
                        // Hide the menu
                        menuBtn.click();
                    }

                });
            }
        });
    }
}