#Leaflet.Locate

A useful control to geolocate the user with many options.

Tested with Leaflet 0.7 in Firefox, Webkit and mobile Webkit.

##Demo

Check out the demo at http://domoritz.github.io/leaflet-locatecontrol/demo/

Usage

Minimal set up:

Add the JavaScript and CSS files

Download and include the JavaScript and CSS files.

For testing purposes and development, you can use the latest version directly from my repository using rawgithub. However, don't do this in production environments! For production environments, use the mapbox CDN.

<link rel="stylesheet" href="//rawgithub.com/domoritz/leaflet-locatecontrol/gh-pages/src/L.Control.Locate.css" />
<!--[if lt IE 9]>
    <link rel="stylesheet" href="//rawgithub.com/domoritz/leaflet-locatecontrol/gh-pages/src/L.Control.Locate.ie.css"/>
<![endif]-->

<script src="//rawgithub.com/domoritz/leaflet-locatecontrol/gh-pages/src/L.Control.Locate.js" ></script>

Add the following snippet to your map initialization:

L.control.locate().addTo(map);

Possible options

The locate controls inherits options from Leaflet Controls.

L.control.locate({
	position: 'topleft',  // set the location of the control
    drawCircle: true,  // controls whether a circle is drawn that shows the uncertainty about the location
    follow: false,  // follow the user's location
    setView: true, // automatically sets the map view to the user's location, enabled if `follow` is true
    keepCurrentZoomLevel: false, // keep the current map zoom level when displaying the user's location. (if `false`, use maxZoom)
    stopFollowingOnDrag: false, // stop following when the map is dragged if `follow` is true (deprecated, see below)
    markerClass: L.circleMarker, // L.circleMarker or L.marker
    circleStyle: {},  // change the style of the circle around the user's location
    markerStyle: {},
    followCircleStyle: {},  // set difference for the style of the circle around the user's location while following
    followMarkerStyle: {},
    icon: 'icon-location',  // `icon-location` or `icon-direction`
    iconLoading: 'icon-spinner  animate-spin',  // class for loading icon
    circlePadding: [0, 0], // padding around accuracy circle, value is passed to setBounds
    metric: true,  // use metric or imperial units
    onLocationError: function(err) {alert(err.message)},  // define an error callback function
    onLocationOutsideMapBounds:  function(context) { // called when outside map boundaries
            alert(context.options.strings.outsideMapBoundsMsg);
    },
    strings: {
        title: "Show me where I am",  // title of the locate control
        popup: "You are within {distance} {unit} from this point",  // text to appear if user clicks on circle
        outsideMapBoundsMsg: "You seem located outside the boundaries of the map" // default message for onLocationOutsideMapBounds
    }
    locateOptions: {}  // define location options e.g enableHighAccuracy: true or maxZoom: 10
}).addTo(map);

Methods

You can call locate() or stopLocate() on the locate control object to set the location of page load for example.

// create control and add to map
var lc = L.control.locate().addTo(map);

// request location update and set location
lc.locate();

You can also use the helper functions to automatically stop following when the map is panned. See the example below.

var lc = L.control.locate().addTo(map);
map.on('dragstart', lc.stopFollowing);

Alternatively, you can unload events when not following to avoid unnecessary events.

map.on('startfollowing', function() {
    map.on('dragstart', lc.stopFollowing);
}).on('stopfollowing', function() {
    map.off('dragstart', lc.stopFollowing);
});

Events

The locate control fires startfollowing and stopfollowing on the map object and passes self as data.

FAQ

How do I set the maximum zoom level?

Set the maxZoom in locateOptions (keepCurrentZoomLevel must not be set to true).

map.addControl(L.control.locate({
       locateOptions: {
               maxZoom: 10
}}));

Screenshot

Users

Sites that use this locate control:

• OpenStreetMap
• MapBox
• wheelmap.org
• OpenMensa
• ...

Developers

Run the demo locally with python -m SimpleHTTPServer and then open http://0.0.0.0:8000/demo.

Thanks

To all contributors and issue reporters.

License

MIT