不使用回调方法加载谷歌地图

Question

i have multiple google map instances on my website,now there are two different google map on a same page, what happens is the first one works and other doesn't now i know the logical issue let me show you my code first

<script>
    function initMap() {
        var myLatLng = {lat: 43.6222102, lng:-79.6694881};

        var map = new google.maps.Map(document.getElementById('map'), {
            zoom: 15,
            center: myLatLng
        });

        var marker = new google.maps.Marker({
            position: myLatLng,
            map: map,
        });
    }
</script>
<script src="https://maps.googleapis.com/maps/api/js?key=my_key&callback=initMap"
        async defer></script>

now as i defined a callback method it always initializes the method named initMap whereas what i want to do is there can be multiple google maps lets suppose initMap2 how can i load them without callback method?

Answer 1

To load the map without a callback, load the API synchronously/inline (without the async defer ), then call your initMap function on the load event.

( Note: FYI: Google changed all their examples to using asynchronous loading to improve the load times)

( Note2: Google has added a "sample" to their documentation describing synchronous loading )

proof of concept fiddle

code snippet:

 function initMap() { var myLatLng = { lat: 43.6222102, lng: -79.6694881 }; var map = new google.maps.Map(document.getElementById('map'), { zoom: 15, center: myLatLng }); var marker = new google.maps.Marker({ position: myLatLng, map: map, }); } google.maps.event.addDomListener(window, 'load', initMap);

 html, body, #map { height: 100%; width: 100%; margin: 0px; padding: 0px }

 <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script> <div id="map"></div>