Methods in JavaScript?

Question

So I made a JavaScript Object, which makes an element in the DOM, and what I use my methods for, is to for example play the audio, set the duration of the audio etc. However, a method that I made inside my object apparently doesn't exist. By the way, I'm new, so I don't really know what I did wrong... But here is my code:

function Audio(paramSource) {
    var object = document.createElement("audio");
    (...)
    function play() {
        object.play();
    };
    (...)
};

var myAudio = new Audio("http://tufda.net/space/limewire.mp3");
myAudio.play();

Thanks in advance :)!

What method specifically doesn't exist? FYI: the new Audio method surely already exists, and you shouldn't be overwriting it — adeneo
– adeneo, Commented Nov 23, 2016 at 14:45
@adeneo I was curious about the Audio.play() method, I should have probably pointed that out — tufda
– tufda, Commented Nov 24, 2016 at 7:44

David · Accepted Answer · 2016-11-23 14:45:11Z

1

Close, you need to assign it as a property to the object. Something like this:

function Audio(paramSource) {
    var object = document.createElement("audio");
    //...
    this.play = function() {
        object.play();
    };
    //...
};

A function can be declared like a variable, and for the Audio object to publicly expose it (instead of just being inside its own scope) you would simply set that variable to a property on this within that scope.

So in the above code, object is a variable internal to the scope of Audio and play is a property on Audio.

answered Nov 23, 2016 at 14:45

David

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Marcos Pérez Gude · Accepted Answer · 2016-11-23 14:47:37Z

1

You can assign to the object the object var:

function Audio(paramSource) {
    this.object = document.createElement("audio");
    (...)
    this.play = function() {
        this.object.play();
    };
    (...)
};

var myAudio = new Audio("http://tufda.net/space/limewire.mp3");
myAudio.play();

By this way you can access to Audio.object from outside.

answered Nov 23, 2016 at 14:47

Marcos Pérez Gude

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