Google Maps Info Window with Asynchronous Loading

Need help with loading a Google map asynchronously on your website? Check out the code snippet below:

function initialize(lat,lng) {

   var mapProp = {
      center: new google.maps.LatLng(lat,lng),
      zoom:15,
      mapTypeId: google.maps.MapTypeId.ROADMAP,
      disableDefaultUI:true
   };
   var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
}

function loadScript() {
   var script = document.createElement("script");
   script.type = "text/javascript";
   script.src = "http://maps.googleapis.com/maps/api/js?key=&sensor=false&callback=initialize";
   document.body.appendChild(script);
}

window.onload = loadScript;

If you want to add an info window to your map, you can do so by following these steps:

...
var lat=40.7127; 
var lng=-74.0059;
..
<div onclick="initialize('+lat+','+lng+');">map</div>
..
html_str += '<div id="googleMap" class="map"></div>';
document.getElementById(id).innerHTML = html_str;

While initializing your basic map is successful, adding an info window might give you some trouble. Attempting to insert the code for the info window into the initialize() function may not yield the desired results. Feel free to reach out if you need assistance in adapting this info window functionality to fit seamlessly into your existing code.

Answer №1

Adding an infowindow to the map requires either specifying a position or using an existing marker as an anchor. It seems that you may be encountering a javascript error:

Uncaught ReferenceError: marker is not defined
.

If you do not have a marker, you can set the position of the infowindow like this:

var infowindow = new google.maps.InfoWindow({
    content: "Hello World!"
});
infowindow.setPosition(map.getCenter());
infowindow.open(map); 

Answer №2

When your loadScript function is called by window.onload, there is already a callback for initialize included. However, if the coordinates are not assigned in this scenario, then it's likely that initialize will fail.

Since you explicitly call the initialize function by clicking on your div, perhaps you could try using a loadScript function without a callback instead.

function loadScript() {
   var script = document.createElement("script");
   script.type = "text/javascript";
   script.src = "http://maps.googleapis.com/maps/api/js?key=&sensor=false";
   document.body.appendChild(script);
}

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