(JavaScript) Google Maps Geolocation Request

Demonstrates how make a Google Maps Geolocation REST API request.

Note: This example requires Chilkat v11.1.0 or greater.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// This example duplicates the following CURL request:
// curl -d @your_filename.json -H "Content-Type: application/json" -i "https://www.googleapis.com/geolocation/v1/geolocate?key=YOUR_API_KEY"

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

var rest = new CkRest();

// Connect to the Google API REST server.
var bTls = true;
var port = 443;
var bAutoReconnect = true;
success = rest.Connect("www.googleapis.com",port,bTls,bAutoReconnect);

// Add the Content-Type request header.
rest.AddHeader("Content-Type","application/json");

// Add your API key as a query parameter
rest.AddQueryParam("key","YOUR_API_KEY");

// The JSON query is contained in the body of the HTTP POST.
// This is a sample query (which we'll dynamically build in this example)
// { 
//  "homeMobileCountryCode": 310,
//  "homeMobileNetworkCode": 260,
//  "radioType": "gsm",
//  "carrier": "T-Mobile",
//  "cellTowers": [
//   {
//    "cellId": 39627456,
//    "locationAreaCode": 40495,
//    "mobileCountryCode": 310,
//    "mobileNetworkCode": 260,
//    "age": 0,
//    "signalStrength": -95
//   }
//  ],
//  "wifiAccessPoints": [
//   { 
//    "macAddress": "01:23:45:67:89:AB",
//    "signalStrength": 8,
//    "age": 0,
//    "signalToNoiseRatio": -65,
//    "channel": 8
//   },
//   { 
//    "macAddress": "01:23:45:67:89:AC",
//    "signalStrength": 4,
//    "age": 0
//   }
//  ]
// }

var json = new CkJsonObject();
json.AppendInt("homeMobileCountryCode",310);
json.AppendInt("homeMobileNetworkCode",260);
json.AppendString("radioType","gsm");
json.AppendString("carrier","T-Mobile");

var aCellTowers = new CkJsonArray();
json.AppendArray2("cellTowers",aCellTowers);

var oCellTower = new CkJsonObject();
aCellTowers.AddObjectAt2(0,oCellTower);
oCellTower.AppendInt("cellId",39627456);
oCellTower.AppendInt("locationAreaCode",40495);
oCellTower.AppendInt("mobileCountryCode",310);
oCellTower.AppendInt("mobileNetworkCode",260);
oCellTower.AppendInt("age",0);
oCellTower.AppendInt("signalStrength",-95);

var aWifi = new CkJsonArray();
json.AppendArray2("wifiAccessPoints",aWifi);

var oPoint = new CkJsonObject();
aWifi.AddObjectAt2(0,oPoint);
oPoint.AppendString("macAddress","01:23:45:67:89:AB");
oPoint.AppendInt("signalStrength",8);
oPoint.AppendInt("age",0);
oPoint.AppendInt("signalToNoiseRatio",-65);
oPoint.AppendInt("channel",8);

aWifi.AddObjectAt2(1,oPoint);
oPoint.AppendString("macAddress","01:23:45:67:89:AC");
oPoint.AppendInt("signalStrength",4);
oPoint.AppendInt("age",0);

var responseJson = rest.FullRequestString("POST","/geolocation/v1/geolocate",json.Emit());
if (rest.LastMethodSuccess == false) {
    console.log(rest.LastErrorText);
    return;
}

// When successful, the response code is 200.
if (rest.ResponseStatusCode !== 200) {
    // Examine the request/response to see what happened.
    console.log("response status code = " + rest.ResponseStatusCode);
    console.log("response status text = " + rest.ResponseStatusText);
    console.log("response header: " + rest.ResponseHeader);
    console.log("response JSON: " + responseJson);
    console.log("---");
    console.log("LastRequestStartLine: " + rest.LastRequestStartLine);
    console.log("LastRequestHeader: " + rest.LastRequestHeader);
    return;
}

json.EmitCompact = false;
console.log("JSON request body: " + json.Emit());

// The JSON response should look like this:
// { 
//  "location": {
//   "lat": 37.4248297,
//   "lng": -122.07346549999998
//  },
//  "accuracy": 1145.0
// }

console.log("JSON response: " + responseJson);

var jsonResp = new CkJsonObject();
jsonResp.Load(responseJson);

var jsonLoc = new CkJsonObject();
jsonResp.ObjectOf2("location",jsonLoc);

// Any JSON value can be obtained as a string..
var latitude = jsonLoc.StringOf("lat");
console.log("latitude = " + latitude);
var longitude = jsonLoc.StringOf("lng");
console.log("longitude = " + longitude);

var accuracy = jsonResp.StringOf("accuracy");
console.log("accuracy = " + accuracy);