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Prototype JavaScript framework
JavaScript Ruby

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An object-oriented JavaScript framework

Prototype is a JavaScript framework that aims to ease development of dynamic web applications. It offers a familiar class-style OO framework, extensive Ajax support, higher-order programming constructs, and easy DOM manipulation.

Targeted platforms

Prototype currently targets the following platforms:

  • Microsoft Internet Explorer for Windows, version 6.0 and higher
  • Mozilla Firefox 1.5 and higher
  • Apple Safari 2.0.4 and higher
  • Opera 9.25 and higher
  • Chrome 1.0 and higher

Using Prototype

To use Prototype in your application, download the latest release from the Prototype web site ( and copy dist/prototype.js to a suitable location. Then include it in your HTML like so:

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

Prototype is also available in the Bower registry: bower install prototype.js.

Building Prototype from source

prototype.js is a composite file generated from many source files in the src/ directory. To build Prototype, you'll need:

  • a copy of the Prototype source tree, either from a distribution tarball or from the Git repository (see below)
  • Grunt 0.4.1 (
  • RDoc, if your Ruby distribution does not include it

From the root Prototype directory,

  • grunt dist will compile the Prototype source using Grunt Resolve and generate dist/prototype.js and dist/prototype.min.js optimized with the Google Closure Compiler
  • grunt test will run unit tests in PhantomJS

Contributing to Prototype

Check out the Prototype source with

$ git clone git://
$ cd prototype
$ git submodule init
$ git submodule update vendor/sprockets vendor/pdoc vendor/unittest_js

Find out how to contribute:

Running Unit Tests

New tests have been written with MochaJS and ProclaimJS assertions. The AJAX and Form Namespaces require a webserver to echo responses which is built into the Mocha Test script to launch a NodeJS Webserver. Mocha can also run tests using PhantomJS which allows command line testing.

  1. Install NodeJS
  2. In the root of the PrototypeJS directory
  3. $ npm install
  4. $ grunt dist
  5. $ grunt test


Please see the online Prototype API:

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