Google地图 - 使用地理编码器通过javascript获取长/ lat

Question

I'm trying to get longitude and latitude values from the google maps api with an address, however it doesn't seem to be returning any value. Is there a problem with my syntax?

var point = GClientGeocoder.getLatLng('1600 Pennsylvania Avenue NW Washington, DC 20500');
alert(point);

Answer 1

It seems like you're using v2 of Google Maps; if you're interested in using v3 (since Google has officially deprecated version 2), you could do something like this:

var mygc = new google.maps.Geocoder();
mygc.geocode({'address' : '1600 Pennsylvania Avenue NW Washington, DC 20500'}, function(results, status){
    console.log( "latitude : " + results[0].geometry.location.lat() );
    console.log( "longitude : " + results[0].geometry.location.lng() );
});

It's similar to the other examples except:

• You call new google.maps.Geocoder() instead of GClientGeocoder()
• You pass in an object with an 'address' property, instead of the string by itself
• The results is a JSON object, which means you have to access lat/lng a little differently

The Google API docs have more detail for v3. Cheers!

Answer 2

This works (provided you have the correct API key, subject to the 2500 requests/day rate limit):

address_string = '1600 Pennsylvania Avenue NW Washington, DC 20500';
geocoder = new GClientGeocoder();
geocoder.getLatLng(
    address_string,
    function(point) {
        if (point !== null) {
            alert(point); // or do whatever else with it
        } else {
            // error - not found, over limit, etc.
        }
    }
);

You seem to be calling a function of GClientGeocoder , where you need to create a new GClientGeocoder() and call its function.

Answer 3

Try it like:

geocoder = new GClientGeocoder();
point = geocoder.getLatLng(address)