Question

I have the following code which registers my iOS device with my APNS server:

pushNotification.registerDevice({
    alert: true,
    badge: true,
    sound: true,
    pw_appid: "***",
    appname: "***"
},

function (status) {
    var deviceToken = status['deviceToken'];
},

function (status) {
    console.warn('failed to register : ' + JSON.stringify(status));
    navigator.notification.alert(JSON.stringify(['failed to register ', status]));
});

This runs onLoad, but I need to access deviceToken outside of the scope of pushNotification.registerDevice() function (status).

Is it possible, in this case, to access deviceToken which is inside a function within a function, outside of the function?

I thought I could make it a global variable, by using window.deviceToken, then calling that later on, but it returns undefined.

Answer 1

If you’re assigning the token to a global and finding its undefined when you try to use it, you will probably find its because the registerDevice ajax hasn’t yet received a response.

Try separating your callback into a separate function, and launch any dependant functions from there.

function registerSuccess(status) {
  // Store token globally
  token = status["deviceToken"];
  // or pass as an argument
  // call functions that depend on the token
  Foo(token);
  Bar(); // uses global
}

Personally I would try and pass as an argument, save polluting the global namespace.