Java Script Class.create() says class not defined

Question

I am new to java script and I went through the following link to learn about classes. http://prototypejs.org/learn/class-inheritance. I tried running the below code in google chrome and it says "Uncaught: Reference Error: Class not defined" and I don't know why it says so. Can anyone help me through this.

here is the code, I copy pasted it from the above link:

var Person = Class.create();
Person.prototype = {
  initialize: function(name) {
    this.name = name;
  },
  say: function(message) {
    return this.name + ': ' + message;
  }
};

var guy = new Person('Miro');
guy.say('hi');
// -> "Miro: hi"

var Pirate = Class.create();
// inherit from Person class:
Pirate.prototype = Object.extend(new Person(), {
  // redefine the speak method
  say: function(message) {
    return this.name + ': ' + message + ', yarr!';
  }
});

var john = new Pirate('Long John');
john.say('ahoy matey');

@GouthamNagappa You are not learning pure JavaScript, you are learning how to use the Prototype.js library. — Siguza
– Siguza, Commented Apr 27, 2015 at 13:58

Lucas Sodré · Accepted Answer · 2015-04-27 14:06:25Z

2

It seems that you're not referenciating the Prototype.js You need to add the Prototype.js to your code

https://ajax.googleapis.com/ajax/libs/prototype/1.7.2.0/prototype.js

Adding <script src="https://ajax.googleapis.com/ajax/libs/prototype/1.7.2.0/prototype.js"></script> to your code should solve the problem

edited Apr 27, 2015 at 14:06

answered Apr 27, 2015 at 13:59

Lucas Sodré

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Comments

manzapanza · Accepted Answer · 2015-04-27 13:59:16Z

1

Did you added the script inclusion?

<script type="text/javascript" src="/path/to/prototype.js"></script>

answered Apr 27, 2015 at 13:59

manzapanza

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