Question

Here is my example object to demonstrate the issue.

Dog = Backbone.Model.extend({
    initialize: function () {
    },
    Speak: function (sayThis) {
        console.log(sayThis);
    },
    CallInternalSpeak: function () {
        this.Speak("arf! from internal function.");
    },
    CallSpeakFromClosure: function () {

        this.Speak("arf! fron outside closure.");

        var callClosure = function () {  // think of this closure like calling jquery .ajax and trying to call .Speak in your success: closure
            console.log("we get inside here fine");
            this.Speak("say hi fron inside closure.");  // THIS DOES NOT WORK
        }

        callClosure();
    }
});

var rover = new Dog;

rover.Speak("arf! from externally called function");
rover.CallInternalSpeak();
rover.CallSpeakFromClosure();

Answer 1

Since you are in Backbone, you can always use Underscore’s bind function as well. After you define callClosure, you can wrap it with a proper binding:

callClosure = _.bind(callClosure, this);