Add Mmenu Off Canvas Mobile Menu to Genesis Child Theme

genesis-add-id-nav.php

/**********************************
 *
 * Add id="menu" attribute to Primary Navigation
 *
 * @author AlphaBlossom / Tony Eppright
 * @link http://www.alphablossom.com
 *
 **********************************/

add_filter( 'genesis_attr_nav-primary', 'youruniqueprefix_primary_nav_id' );
function youruniqueprefix_primary_nav_id( $attributes ) {

    $attributes['id'] = 'menu';
    return $attributes;

}

genesis-add-mobile-nav-control.php

/**********************************
 *
 * Add menu control for Mmenu
 *
 * @author AlphaBlossom / Tony Eppright
 * @link http://www.alphablossom.com
 *
 **********************************/

/* Navigation functions */
add_action( 'genesis_before', 'youruniqueprefix_nav_control', 1 );
function youruniqueprefix_nav_control() {
    ?>
    <div id="header">
        <a href="#menu">
            <i class="fa fa-bars"></i>
        </a>
    </div>
    <?php
}

hide-nav-control.css

/* Mobile Navigation control */
#header {
    display: none;
}

initialize-mmenu.js

jQuery(document).ready(function($) {

	$(function() {

		// initiate mmenu
		$("#menu").mmenu({
			// options go here
		}, {
			// configuration:
			clone : true,
		});

	});

});

mmenu-enqueue-files.php

/**********************************
 *
 * Enqueue Style and Scripts for Mmenu.
 *
 * @author AlphaBlossom / Tony Eppright
 * @link http://www.alphablossom.com
 *
 **********************************/
add_action( 'wp_enqueue_scripts', 'youruniqueprefix_load_scripts');
function youruniqueprefix_load_scripts() {

    // CSS
    wp_enqueue_style( 'youruniqueprefix_mmenu_css' , CHILD_URL . '/css/jquery.mmenu.css' , null );
    
    // JS
    wp_enqueue_script( 'youruniqueprefix_mmenu_js' , CHILD_URL . '/js/jquery.mmenu.min.js' , array( 'jquery' ), '4.2.6', FALSE ); // mmenu js
    wp_enqueue_script( 'youruniqueprefix_headerscript_js' , CHILD_URL . '/js/headerscript.js' , array( 'jquery' ), '1.0', FALSE ); // custom header j

}

mobile-responsive-nav.css

@media only screen and (max-width: 767px) {

    /* Mobile Navigation */
    .site-container .nav-primary {
        display: none;
    }
    
    .mm-page #header {
        display: block;
        position: absolute;
    }
    
    .mm-page #header a {
        border-right: 1px solid #666;
        display: block;
        height: 64px;
        text-align: center;
        width: 64px;
    }
    
    .mm-page #header a i {
        border-right: 1px solid #FFFFFF;
        font-size: 20px;
        line-height: 64px;
        width: 63px;
    }

}

nav-site-container-wrap.css

.site-container .genesis-nav-menu {
    clear: both;
    color: #fff;
    font-family: 'Lato', sans-serif;
    letter-spacing: 1px;
    letter-spacing: 0.1rem;
    line-height: 1.5;
    margin: 0;
    padding: 0;
    width: 100%;
}

.site-container .genesis-nav-menu .menu-item {
    display: inline-block;
    margin: 0;
    padding: 0;
    text-align: left;
    float: left;
}