google maps async - google-maps-api-3

Question

I have a google maps script that I'm using that works fine declaring google maps with a script tag, but I'd like to load it asynchronously and am having trouble making the changes. This is what I currently have:
//<![CDATA[
$(window).load(function(){
var locations = [
[
"850 Boylston Street",
"Chestnut Hill, MA 02467",
"42.326435",
"-71.149499"
],
[
"Subway Brookline Village",
"Green Line, D",
"42.33279",
"-71.11630"
],
[
"Shuttle Brookline Village",
"10 Brookline Place",
"42.33262",
"-71.116439"
],
[
"Subway Chestnut Hill",
"Green Line, B",
"42.338164",
"-71.153164"
],
[
"Subway Cleveland Circle",
"Green Line, C",
"42.336145",
"-71.149323"
],
[
"Subway Reservoir",
"Green Line, D",
"42.335132",
"-71.148762"
],
[
"Bus 51 Reservoir",
"Pick up from Subway",
"42.335021",
"-71.148988"
],
[
"Bus 51 Route 9",
"Drop off Route 9",
"42.326499",
"-71.142588"
],
[
"75 Francis Street",
"Boston, MA 02115",
"42.33619",
"-71.10705"
],
[
"Shuttle Longwood",
"Shapiro Building",
"42.33603",
"-71.10779"
],
[
"Subway Longwood",
"Green Line, D",
"42.34113",
"-71.11044"
],
[
"Subway Brigham Circle",
"Green Line, E",
"42.33422",
"-71.10455"
],
[
"Parking Garage",
"70 Francis Street",
"42.33422",
"-71.10455"
],
[
"20 Patriots Place",
"Foxboro, MA 02035",
"42.09254",
"-71.26629"
]
];
gmarkers = [];
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 16,
center: new google.maps.LatLng(42.326435, -71.149499),
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl:false
});
var infowindow = new google.maps.InfoWindow();
function createMarker(latlng, html) {
var marker = new google.maps.Marker({
position: latlng,
map: map
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(html);
infowindow.open(map, marker);
});
return marker;
}
for (var i = 0; i < locations.length; i++) {
/* alert("location:"+
locations[i][0]+":"+locations[i][2]+","+locations[i][3]);
*/
gmarkers[locations[i][0]]=
createMarker(new google.maps.LatLng(locations[i][2], locations[i][3]), locations[i][0]
+ "<br>" + locations[i][1]);
}
/*
$(function() {
$('#locations h3 a').each(function() {
$(this).on('click', function() {
google.maps.event.trigger(marker, 'click');
})
});
});
*/
});//]]>

Answer 1

You have two options
inject the script tag as described here:
https://developers.google.com/maps/documentation/javascript/tutorial#Loading_the_Maps_API
use the AjaxLoader:
https://google-developers.appspot.com/loader/
You would add:
<script type="text/javascript" src="http://www.google.com/jsapi"> </script>
at the top of the page and then load the map using:
google.load("maps","3.9", {"other_params":"sensor=false"});
HTH

Answer 2

<script type="text/javascript">
var map;
function initialize() {
var mapOpt = {
/* le coordinate di partenza si possono impostare dal db */
center: new google.maps.LatLng(42, 12),
zoom: 15,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("googleMap"), mapOpt);
}
...in your html refer in a element "< div id="googleMap">"