Retrieve geolocation of user in under 140 bytes.
The function takes in a callback which will return:
/**
* @callback {Mixed} arguments[0] Error if there is one (either browser specific or 1 if geolocation is not available)
* @callback {Object} arguments[1] Coordinates of the user
* @callback {Number} arguments[1].latitude Latitude of the user; ranges from -180 (180S) to 180 (180N)
* @callback {Number} arguments[1].longitude Longitude of the user; ranges from -180 (180W) to 180 (180E)
*/| // Original available: https://gist.github.com/4053059 | |
| // Asynchronous retrieval of coordinates | |
| function getCoordinates(cb) { | |
| // Grab geolocation from the navigator | |
| var geolocation = window.navigator.geolocation; | |
| // If geolocation exists, start fetching location | |
| if (geolocation) { | |
| geolocation.getCurrentPosition(function (position) { | |
| cb(null, position.coords); | |
| }, cb); | |
| } else { | |
| // Otherwise, callback with an error | |
| cb(1); | |
| } | |
| } |
| function(c,g){g=navigator.geolocation;g?g.getCurrentPosition(function(p){c(null,p.coords)}):c(1)} |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 YOUR_NAME_HERE http://twolfson.com/ | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
| { | |
| "name": "geolocationLookup", | |
| "description": "Geolocation lookup that accepts an error-first callback", | |
| "keywords": [ | |
| "geolocation", | |
| "browser", | |
| "error-first" | |
| ] | |
| } |
| <!DOCTYPE html> | |
| <title>Foo</title> | |
| <div>Expected value: <b>Lat: ##.####, Lng: ##.####</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <em>Be sure to accept the geolocation request.</em> | |
| <script> | |
| // write a small example that shows off the API for your example | |
| // and tests it in one fell swoop. | |
| var myFunction = function(c,g){g=navigator.geolocation;g?g.getCurrentPosition(function(p){c(null,p.coords)}):c(1)} | |
| var $ret = document.getElementById( "ret" ); | |
| // Grab the output and the geolocation | |
| myFunction(function (err, coords) { | |
| // If there was an error, update the text accordingly | |
| if (err) { | |
| $ret.innerHTML = 'Geolocation could not be used =('; | |
| } else { | |
| // Otherwise, output the coordinates | |
| $ret.innerHTML = 'Geolocation found!! Lat: ' + coords.latitude + ' Lng: ' + coords.longitude; | |
| } | |
| }); | |
| </script> |