Javascript OOP calling object functions (getUserMedia)

Question

I have a problem with my javascript code since I started changing it to an OOP approach. I want to create an Object class with many class functions within and the class functions should be able to call each other. But this is not working. Here is a (simpified) code snippet:

function MyClass(){
    this.someClassVariable = false;
    this.anotherClassVariable = 10;
}

MyClass.prototype = {
    constructor: MyClass,

   firstFunction:function(){
       if (this.someClassVariable == false){
           this.secondFunction();
       }
   },

   secondFunction:function(){
       while(this.anotherClassVariable != 0){
           this.anotherClassVariable--;
           console.log(this.anotherClassVariable);
       }
   }
}

var myClass = new MyClass();
navigator.getUserMedia({audio: true}, myClass.firstFunction, function(e) {});

This always gets me the the error

Uncaught TypeError: __tracer.traceFunCall(...) is not a function

But when I call the Class and Function without getUserMedia() like this:

var myClass = new MyClass();
myClass.firstFunction();

it works.
Am I missing something? Would be really glad if someone could give me a hint, searched a lot for this specific topic but didn't find anything.

Thanks!

here myClass.firstFunction you pass reference to function, so when this would be called - this inside would be not referes to myClass variable — Grundy
– Grundy, Commented Jul 30, 2015 at 10:17
possible duplicate of Scoping problem with Javascript callback — melpomene
– melpomene, Commented Jul 30, 2015 at 10:17

jrath · Accepted Answer · 2015-07-30 10:21:01Z

0

Try out

navigator.getUserMedia({audio: true}, myClass.firstFunction.bind(myClass), function(e) {});

answered Jul 30, 2015 at 10:21

jrath

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2 Comments

VP. Over a year ago

Please elaborate your code-snippet with some explanation.

jfjs Over a year ago

this didn't solve the problem unfortunately, still getting the error message

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