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Asked: 2026-06-14T16:40:21+00:00

Possible Duplicate: Javascript: Do I need to put this.var for every variable in an

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Possible Duplicate:
Javascript: Do I need to put this.var for every variable in an object?

I wanted to create a “class” in JavaScript which other “classes” should inherit from.

Thus, I added “public methods” using the prototype object.

Inside these methods, I want to access private properties of my class.

It seems like I cannot access them. How do I do this? This is my code:

<!doctype html>

<html>

    <head>
        <title>OOP test</title>

        <script>

            var ParentClass = function(){
                var data = [];
            }

            ParentClass.prototype.addData = function(somedata){
                data.push(somedata); // ReferenceError: Can't find variable: data
            }

            var p = new ParentClass();
            p.addData("foo");

        </script>
    </head>

    <body>
    </body>

</html>
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1 Answer

  1. Editorial Team

    <head>
    <title>OOP test</title>

    <script>

        var ParentClass = function(){
            this.data = [];
        }

        ParentClass.prototype.addData = function(somedata){
            this.data.push(somedata); // ReferenceError: Can't find variable: data
        }

        var p = new ParentClass();
        p.addData("foo");

    </script>
</head>

<body>
</body>

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