yuheijotaki.com

2017/01/24 : 
Advanced Custom Fields で Google Maps

https://www.advancedcustomfields.com/resources/google-map/
の通りなのですが、

<!-- 'XXXXXXXXXX'はAPI KEYを入れる -->
<script src="https://maps.googleapis.com/maps/api/js?key=XXXXXXXXXX"></script>
<script type="text/javascript">
(function($) {

/*
*  new_map
*
*  This function will render a Google Map onto the selected jQuery element
*
*  @type	function
*  @date	8/11/2013
*  @since	4.3.0
*
*  @param	$el (jQuery element)
*  @return	n/a
*/

function new_map( $el ) {
	// var
	var $markers = $el.find('.marker');
	// vars
	var args = {
		zoom		: 16,
		center		: new google.maps.LatLng(0, 0),
		mapTypeId	: google.maps.MapTypeId.ROADMAP
	};
	// create map
	var map = new google.maps.Map( $el[0], args);
	// add a markers reference
	map.markers = [];
	// add markers
	$markers.each(function(){
		add_marker( $(this), map );
	});
	// center map
	center_map( map );
	// return
	return map;
}

/*
*  add_marker
*
*  This function will add a marker to the selected Google Map
*
*  @type	function
*  @date	8/11/2013
*  @since	4.3.0
*
*  @param	$marker (jQuery element)
*  @param	map (Google Map object)
*  @return	n/a
*/

function add_marker( $marker, map ) {
	// var
	var latlng = new google.maps.LatLng( $marker.attr('data-lat'), $marker.attr('data-lng') );
	// create marker
	var marker = new google.maps.Marker({
		position	: latlng,
		map			: map
	});
	// add to array
	map.markers.push( marker );
	// if marker contains HTML, add it to an infoWindow
	if( $marker.html() )
	{
		// create info window
		var infowindow = new google.maps.InfoWindow({
			content		: $marker.html()
		});
		// show info window when marker is clicked
		google.maps.event.addListener(marker, 'click', function() {

			infowindow.open( map, marker );
		});
	}
}

/*
*  center_map
*
*  This function will center the map, showing all markers attached to this map
*
*  @type	function
*  @date	8/11/2013
*  @since	4.3.0
*
*  @param	map (Google Map object)
*  @return	n/a
*/

function center_map( map ) {
	// vars
	var bounds = new google.maps.LatLngBounds();
	// loop through all markers and create bounds
	$.each( map.markers, function( i, marker ){

		var latlng = new google.maps.LatLng( marker.position.lat(), marker.position.lng() );

		bounds.extend( latlng );

	});
	// only 1 marker?
	if( map.markers.length == 1 )
	{
		// set center of map
	    map.setCenter( bounds.getCenter() );
	    map.setZoom( 16 );
	}
	else
	{
		// fit to bounds
		map.fitBounds( bounds );
	}
}

/*
*  document ready
*
*  This function will render each map when the document is ready (page has loaded)
*
*  @type	function
*  @date	8/11/2013
*  @since	5.0.0
*
*  @param	n/a
*  @return	n/a
*/
// global var
var map = null;
$(document).ready(function(){
	$('.acf-map').each(function(){
		// create map
		map = new_map( $(this) );
	});
});
})(jQuery);
</script>



<!-- 'FIELD_NAME'にカスタムフィールドのフィールド名 -->
<?php $location = get_field('FIELD_NAME'); ?>
<?php if( !empty($location) ): ?>
	<div class="acf-map">
		<div class="marker" data-lat="<?php echo $location['lat']; ?>" data-lng="<?php echo $location['lng']; ?>"></div>
	</div>
	<p><a href="http://maps.google.co.jp/maps?hl=ja&ie=UTF8&z='+18+'&q=<?php echo $location['address']; ?>" target="_blank">大きな地図で見る</a></p>
<?php endif; ?>