Error message: The Google Map API is showing an error stating that 'google' is not defined in the MVC5 JavaScript

I keep encountering the "google is undefined" error message in my JavaScript code.

While I understand that this issue may seem similar to this, I am facing it within a different context, possibly related to MVC.

In the standard MCV5 website template, I have added the following script in the head section of the main _layout.chtml template:

<script src="http://maps.google.com/maps/api/js?sensor=false"></script>

This snippet is used within one of the views for the account/index action:

<div id="map_canvas"></div>
<span id="result"></span>
<script>
    var map = null;
    var markersArray = [];

    function initialize() {

        var latlng = new google.maps.LatLng(13.73868, 1.07143);

        var settings = {
            zoom: 14,
            center: latlng,
            mapTypeControl: true,
            scaleControl: true,
            mapTypeControlOptions: {
                style: google.maps.MapTypeControlStyle.DROPDOWN_MENU
            },
            navigationControl: true,
            navigationControlOptions: {
                style: google.maps.NavigationControlStyle.DEFAULT
            },
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            backgroundColor: 'white'
        };

        map = new google.maps.Map(document.getElementById('map_canvas'), settings);
        google.maps.event.addListener(map, 'click', function (event) {
            document.getElementById('result').innerHTML = 'Lat: ' + event.latLng.lat() + ' Lng: ' + event.latLng.lng();
        });
    }

    window.onload = initialize;

</script>

The problem arises when the linked Google JS file fails to load before the initialize() function executes, resulting in the "google is undefined" error at the beginning of the function.

Any assistance on resolving this issue would be greatly appreciated.

Answer №1

The main concern with MVC arises when loading your layout. Check the page source to confirm that the Google Maps API script is present on the page. If it's missing, investigate why your view is not utilizing the expected layout.

If the script is indeed on the page, ensure that the JS file loads correctly by opening the link. Sometimes, especially on corporate networks, firewalls or security software can block certain scripts from loading properly. In such cases, you may need to liaise with your Infrastructure department.

Additionally, be mindful of your use of SSL. If the site you're loading this script on uses SSL, the script may fail to load if it comes over HTTP instead of HTTPS. To avoid this issue, always opt for the HTTPS version of external resources. You can also make the URL protocol relative:

<script src="//maps.google.com/maps/api/js?sensor=false"></script>

By using a protocol-relative URL, the script will request either HTTP or HTTPS depending on what your site is using, unless the third-party requires a different domain for SSL.

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