Google API for location based on user IP address

Question

I am looking for a way to get the user s current location  city  based on is IP address using the Google Maps APIs   Something similar to http   freegeoip net json but only using the Google Maps APIs  Is this possible

User · Answer

It looks like Google actively frowns on using IP-to-location mapping:

https://developers.google.com/maps/articles/geolocation?hl=en

That article encourages using the W3C geolocation API. I was a little skeptical, but it looks like almost every major browser already supports the geolocation API:

http://caniuse.com/geolocation

User · Answer

Here s a script that will use the Google API to acquire the users postal code and populate an input field   function postalCodeLookup input        var head  document getElementsByTagName  head   0           script  document createElement  script        script src     maps googleapis com maps api js sensor false       head appendChild script       script onload   function             if  navigator geolocation                var a   input                  fallback   setTimeout function                          fail  10 seconds expired                       10000                navigator geolocation getCurrentPosition function  pos                    clearTimeout fallback                   var point   new google maps LatLng pos coords latitude  pos coords longitude                   new google maps Geocoder   geocode   latLng   point   function  res  status                        if  status    google maps GeocoderStatus OK  amp  amp  typeof res 0       undefined                             var zip   res 0  formatted address match    s w 2  s  d 5                              if  zip                                a value   zip 1                             else fail  Unable to look-up postal code                          else                           fail  Unable to look-up geolocation                                                             function  err                    fail err message                             else               alert  Unable to find your location                       function fail err                console log  err   err               a value  Try Again                          You can adjust accordingly to acquire different information   For more info  check out the Google Maps API documentation

User · Answer

Google already appends location data to all requests coming into GAE  see Request Header documentation for go  java  php and python   You should be interested X-AppEngine-Country  X-AppEngine-Region  X-AppEngine-City and X-AppEngine-CityLatLong headers   An example looks like this   X-AppEngine-Country US X-AppEngine-Region ca X-AppEngine-City norwalk X-AppEngine-CityLatLong 33 902237 -118 081733

[google-app-engine] Google API for location, based on user IP address

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