Create shortcode to display map of all child page locations

child-pages-acf-map.php

<?php // Put this code in functions.php or a custom plugin. Don't include opening php tag

/**
 * Create shortcode to display map of all child page locations
 * 
 * @author  Mike Hemberger
 * @link 	http://thestizmedia.com/shortcode-to-show-map-markers-of-child-pages-with-acf-pro/
 *
 * @return  mixed
 */
add_shortcode('child_pages_map', 'tsm_do_child_pages_map');
function tsm_do_child_pages_map( $atts ){

    // Enqueue our scripts (previously registered)
    wp_enqueue_script('google-map');
    wp_enqueue_script('amc-map');

    // Get our parent page ID - defaults to current page
    extract( shortcode_atts( array('parent' => get_the_ID() ), $atts ) );

    // Show Posts
    $args = array(
	'post_type'      => 'page',
	'posts_per_page' => '-1',
	'post_parent'    => $parent,
    );

    $post_type = new WP_Query( $args );

    $output = '';

    // If our query found any posts
    if ( $post_type->have_posts() ) {

	    $output .= '<div class="acf-map">';

	        // Loop through the posts
	        while ( $post_type->have_posts() ) : $post_type->the_post();

	            // Get each posts location
	            $location = get_field( 'data_facility_location' );

	            // If the post has a location set, show the marker
	            if ( $location ) {
		            $output .= '<div class="marker" data-lat="' . $location['lat'] . '" data-lng="' . $location['lng'] . '">';
		                $output .= '<a style="display:block;text-align:center;" href="' . get_the_permalink() . '">' . get_the_title() . '</a>';
		            $output .= '</div>';
	            }

			endwhile;

	    $output .= '</div>';
		
	    // Include CSS for our map (You can move this to your stylesheet)
	    $output .= '<style type="text/css">
	        .acf-map {
	            width: 100%;
	            height: 300px;
	            margin-bottom: 20px;
	        }
	        .acf-map img {
			    max-width: none;
			}
		    </style>';


    } // if
    wp_reset_postdata();

    // Output our data
	return $output;
}