Question

I am using phonegap in android development. I wrote that PoC, however I can not figure out why it does not change the latitude of profile variable. Actually

alert(profile.latitude);

runs before the

geoCode.setLocation();

here is my code;

document.addEventListener("deviceready", onDeviceReady, false);

var profile = {
    name: "",
    id: "red",
    latitude: "xx",
    longtitude: "",
    setCoordinates: function (latit, longt) {
        this.latitude = latit;
        this.longtitude = longt;
    }
};

var geoCode = {
    onSuccess: function (position) {
        profile.latitude = position.coords.latitude;
    },

    onError: function (error) {
    },

    setLocation : function () {
        navigator.geolocation.getCurrentPosition(this.onSuccess, this.onError);
    }
};

// Wait for PhoneGap to load
//

function onDeviceReady() {

    geoCode.setLocation();
    //alert("2");
    alert(profile.latitude);
};

thanks in advance

Answer 1

navigator.geolocation.getCurrentPosition is an asynchronous function. You need to do something like :

var geoCode = {


setLocation : function (callback) {

    onSuccess: function (position) {
       callback(position.coords.latitude);
    },

    onError: function (error) {
    },
    navigator.geolocation.getCurrentPosition(onSuccess, onError);
}

};

// Wait for PhoneGap to load
//

function onDeviceReady() {

    geoCode.setLocation(function(latitude) {
        alert(latitude);
    });
};