In some sites of purchases / services is made an identification or suggestion of the city that the user is to be able to show only the specific products / services of the city of the user.
Detail, this will be used only for non-registered users, why I will be obliged to register the city and thus I can make the filter correctly, but without this record how can I do it?
You have several examples and codes ready on the internet, but basically what you should do is:
1) Get the coordinates with HTML5 Geolocation: w3schools - HTML5 Geolocation
//Check if browser supports W3C Geolocation API
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(successFunction, errorFunction);
}
//Get latitude and longitude;
function successFunction(position) {
var lat = position.coords.latitude;
var long = position.coords.longitude;
}
2) Get the city from the coordinates with the google API: Google Developers - Geocoding
"http://maps.googleapis.com/maps/api/geocode/jsonlatlng='+lat+','+long+'&sensor=true"
stackoverflow - Get city name using geolocation
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Reverse Geocoding</title>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script><scripttype="text/javascript">
var geocoder;
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(successFunction, errorFunction);
}
//Get the latitude and the longitude;
function successFunction(position) {
var lat = position.coords.latitude;
var lng = position.coords.longitude;
codeLatLng(lat, lng)
}
function errorFunction(){
alert("Geocoder failed");
}
function initialize() {
geocoder = new google.maps.Geocoder();
}
function codeLatLng(lat, lng) {
var latlng = new google.maps.LatLng(lat, lng);
geocoder.geocode({'latLng': latlng}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
console.log(results)
if (results[1]) {
//formatted address
alert(results[0].formatted_address)
//find country name
for (var i=0; i<results[0].address_components.length; i++) {
for (var b=0; b<results[0].address_components[i].types.length;b++) {
//there are different types that might hold a city admin_area_lvl_1 usually does in come cases looking for sublocality type will be more appropriate
if (results[0].address_components[i].types[b] == "administrative_area_level_1") {
//this is the object you are looking for
city= results[0].address_components[i];
break;
}
}
}
//city data
alert(city.short_name + " " + city.long_name)
} else {
alert("No results found");
}
} else {
alert("Geocoder failed due to: " + status);
}
});
}
</script>
</head>
<body onload="initialize()">
</body>
</html>
Use GeoIP, it does not give the exact location of the city, but the approximate region of your access point through the user's IP.
<?php
$record = geoip_record_by_name('192.168.0.1');
if ($record) {
print_r($record);
}
?>
The variable $record returns values such as, continent, country, cities, longitude, region, area code, etc.
To find the returned parameters, take a look at the manual .
Requires installation.
Installation for Linux / Windows
Installation on Linux (OpenSuse)
Using HTML5 Geolocation and OpenStreetMaps Geographic Data:
navigator.geolocation.getCurrentPosition(function(posicao) {
var url = "http://nominatim.openstreetmap.org/reverse?lat="+posicao.coords.latitude+"&lon="+posicao.coords.longitude+"&format=json&json_callback=preencherDados";
var script = document.createElement('script');
script.src = url;
document.body.appendChild(script);
});
function preencherDados(dados) {
alert(dados.address.city);
}