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ref: http://jsfiddle.net/haG2S/

HTML:
<div  class="map_container">
	<div class="map-responsive">
	  <div id="map" style=""></div>
	</div>
	<div class="clear"></div>
	<div id="directionsPanel"></div>
</div>




JS AND PHP:

<!-- ===================================  GET LATITUDE AND LONGITUDE   =========================================  -->

<?php
 // Get latitude and longitude by address         
    $address = get_field('map') ;  
    $prop_title = get_field('property_title') ;
    $prop_title .= '<br>' . $address ; // append property address below property title
    $property_title = '"' . $prop_title . '"' ; // add quotes around prop title
    $prepAddr = str_replace(' ','+',$address);
    $geocode=file_get_contents('http://maps.google.com/maps/api/geocode/json?address='.$prepAddr.'&sensor=false');
    $output= json_decode($geocode);
    $latitude  = $output->results[0]->geometry->location->lat;
    $longitude = $output->results[0]->geometry->location->lng;
?>   


<script >

    var latlng = new google.maps.LatLng(<?php  echo $latitude ?>, <?php echo $longitude ?>);
    var myOptions = {
		zoom: <?php the_field('map_zoom') ; ?>,  // let the user pick the zoom value for the map
		scrollwheel: false, // disable scrollwheel zoom, this should always be the default  >_<
		center: latlng,
		mapTypeId: google.maps.MapTypeId.ROADMAP,
		// controls map terrain: [map|satellite]
		mapTypeControlOptions: {
		style: google.maps.MapTypeControlStyle.HORIZONTAL_BAR,
		position: google.maps.ControlPosition.TOP_CENTER
		},
		// this controls the plus/minus buttons
		zoomControlOptions: {
		position: google.maps.ControlPosition.LEFT_CENTER
		},
		// yellow man position
		streetViewControlOptions: {
		position: google.maps.ControlPosition.LEFT_TOP
		}
    };
    
    
    var map = new google.maps.Map(document.getElementById("map") ,  myOptions );
    
    var marker = new google.maps.Marker({
        position: new google.maps.LatLng(<?php  echo $latitude ?>, <?php echo $longitude ?>),
        map: map,
        title: 'Atlanta/Sandy Springs',
        clickable: true
    });
    
    
    var infowindow = new google.maps.InfoWindow({
        content: "Your address: <input id='clientAddress' type='text'>"+
                "<input type='button' onClick=getDir() value='Go!'>"
    });

    google.maps.event.addListener(marker, 'click', function () {
        infowindow.open(map, marker);
    });
    
    geocoder = new google.maps.Geocoder();
    directionsService = new google.maps.DirectionsService();
    directionsDisplay = new google.maps.DirectionsRenderer({
        suppressMarkers: false
    });
    
    directionsDisplay.setMap(map);
    directionsDisplay.setPanel(document.getElementById("directionsPanel"));
    
</script>


<script>

function getDir() {
    geocoder.geocode({
        'address': document.getElementById('clientAddress').value
    },

    function (results, status) {
        if (status == google.maps.GeocoderStatus.OK) {
            var origin = results[0].geometry.location;
            var destination = new google.maps.LatLng(<?php  echo $latitude ?>, <?php echo $longitude ?>);

            var request = {
                origin: origin,
                destination: destination,
                travelMode: google.maps.DirectionsTravelMode.DRIVING
            };

            directionsService.route(request, function (response, status) {
                if (status == google.maps.DirectionsStatus.OK) {
                    directionsDisplay.setDirections(response);
                }
            });

        } else {
            document.getElementById('clientAddress').value =
                "Directions cannot be computed at this time.";
        }
    });
}
	
</script>