[javascript] How to get Client location using Google Maps API v3?

How do you get Client location using Google Maps API v3? I tried the following code but kept getting the "google.loader.ClientLocation is null or not an object" error. Any ideas why ??

if (google.loader.ClientLocation) {
            alert(google.loader.ClientLocation.latitude+" "+google.loader.ClientLocation.longitude);
        }

Thank You

No need to do your own implementation. I can recommend using geolocationmarker from google-maps-utility-library-v3.

It seems you now do not need to reverse geocode and now get the address directly from ClientLocation:

google.loader.ClientLocation.address.city

A bit late but I got something similar that I'm busy building and here is the code to get current location - be sure to use local server to test.

Include relevant scripts from CDN:

    <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&signed_in=true&callback=initMap">

HTML

<div id="map"></div>

CSS

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

JS

var map = new google.maps.Map(document.getElementById('map'), {
    center: {lat: -34.397, lng: 150.644},
    zoom: 6
});
var infoWindow = new google.maps.InfoWindow({map: map});

// Try HTML5 geolocation.
if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(position) {
        var pos = {
            lat: position.coords.latitude,
            lng: position.coords.longitude
        };

        infoWindow.setPosition(pos);
        infoWindow.setContent('Location found.');
        map.setCenter(pos);
    }, function() {
        handleLocationError(true, infoWindow, map.getCenter());
    });
} else {
    // Browser doesn't support Geolocation
    handleLocationError(false, infoWindow, map.getCenter());
}

function handleLocationError(browserHasGeolocation, infoWindow, pos) {
    infoWindow.setPosition(pos);
    infoWindow.setContent(browserHasGeolocation ?
                          'Error: The Geolocation service failed.' :
                          'Error: Your browser doesn\'t support geolocation.');
}

DEMO

https://jsfiddle.net/ToreanJoel/4ythpy02/

I couldn't get the above code to work.

Google does a great explanation though here: http://code.google.com/apis/maps/documentation/javascript/basics.html#DetectingUserLocation

Where they first use the W3C Geolocation method and then offer the Google.gears fallback method for older browsers.

The example is here:

http://code.google.com/apis/maps/documentation/javascript/examples/map-geolocation.html