APIs for Finding Location
Google launched two APIs for finding the location of a user from a web application. The most simple way, which is also the least precise, is to derive some information about location from the IP. Google AJAX API has an object named google.loader.ClientLocation that includes "metro-level granularity properties": country, region, city, low resolution latitude and longitude. This could be useful if you want to customize a web page for a specific country or to prefill information about location. You probably noticed that google.com automatically redirects to the appropriate international domain and that when you create a Google account your country is already selected.
http://googlesystem.blogspot.com/2008/08/apis-for-finding-location.html
Developer's Guide - Google AJAX APIs - Google Code
When an application makes used of the AJAX API loader, the loader attempts to geo locate the client based on it's IP address. If this process succeeds, the client's location, scoped to the metro level, is made available in the google.loader.ClientLocation property. If the process fails to find a match, this property is set to null.
http://code.google.com/apis/ajax/documentation/#ClientLocation
http://code.google.com/apis/gears/api_geolocation.html
試しにやってみたら"google.loader.ClientLocation.address.region"で"「大阪府」って出た。
あと"ClientLocation.latitude"と"ClientLocation.longitude"で緯度経度が得られるので、setCenterで中心位置を変更出来る。
google.load("maps", "2");
google.load("search", "1");
google.setOnLoadCallback(function() {
var map = new google.maps.Map2(document.getElementById("map"));
map.setCenter(new google.maps.LatLng(
google.loader.ClientLocation.latitude,
google.loader.ClientLocation.longitude), 10);
});
実行結果は以下
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