AJAX Callback and Javascript class variables assignments
- by Gianluca
I am trying to build a little javascript class for geocoding addresses trough Google Maps API.
I am learning Javascript and AJAX and I still can't figure out how can I initialize class variables trough a callback:
// Here is the Location class, it takes an address and
// initialize a GClientGeocoder. this.coord[] is where we'll store lat/lng
function Location(address) {
this.geo = new GClientGeocoder();
this.address = address;
this.coord = [];
}
// This is the geoCode function, it geocodes object.address and
// need a callback to handle the response from Google
Location.prototype.geoCode = function(geoCallback) {
this.geo.getLocations(this.address, geoCallback);
}
// Here we go: the callback.
// I made it a member of the class so it would be able
// to handle class variable like coord[]. Obviously it don't work.
Location.prototype.geoCallback = function(result) {
this.coord[0] = result.Placemark[0].Point.coordinates[1];
this.coord[1] = result.Placemark[0].Point.coordinates[0];
window.alert("Callback lat: " + this.coord[0] + "; lon: " + this.coord[1]);
}
// Main
function initialize() {
var Place = new Location("Tokyo, Japan");
Place.geoCode(Place.geoCallback);
window.alert("Main lat: " + Place.coord[0] + " lon: " + Place.coord[1]);
}
google.setOnLoadCallback(initialize);
Thank you for helping me out!
