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See also:
http://www.smashingmagazine.com/2006/11/15/ajax-dhtml-and-javascript-libraries/
http://www.whenpenguinsattack.com/2007/04/24/top-5-javascript-frameworks/?articleid=890
http://www.c-point.com/javascript_and_ajax_libraries.php

Proto.Menu is a simple and lightweight prototype-based solution for context menu functionality on your page

Eloquent JavaScript is a digital book providing a comprehensive introduction (tutorial) to the JavaScript programming language. Apart from a bookful of text, it contains plenty of example programs, and an environment to try them out and play with them. The book is aimed at the beginning programmer ― people with prior programming experience might also get something out of it, but they should not read chapters 2 to 5 too closely, because most of the concepts discussed there will probably be nothing new to them. Do make sure you read the end of the first chapter, which has some essential information about the book itself. The book is freely available, and may be used (as a whole or in parts) in any way you see fit, as long as I am credited as the original author. A copy of the book for off-line reading can be downloaded as a zip file, and a more easily printable version can be found here.

Superb tool for analsysing the performance of web pages - extends the equally superb Firebug.
Hint: Use Firefox for web development!!

Simple(ish) work-around for IE's lack of :hover for anything but <a> tags.

Very useful tool for analysing web page performance

Code HTML from client side javascript using a simple template language that can be stored in a textarea

Good list of charting options (free and commercial) for web-based applications.

JS library to standardise access to the DOM

very good tutorial

The Problem With Dynamic JavaScript However, what if the JavaScript file where you need to set breakpoints is not static but instead dynamic (generated on the fly). If you set a breakpoint in this case and reload the page, the breakpoint will most likely disappear, especially if the JavaScript url is generated uniquely every time. The Solution If you have access to the source, the solution comes in the form of the debugger; keyword. Just add it to your dynamic JavaScript generator or into any JavaScript file you have access to exactly where you want Firebug to break, and voila - it does.

enable to see the x & Y value mouse position

A Simple Guide for binary operations in javascript.

This course is designed for people who have no prior programming knowledge. You will learn fundamental programming concepts through JS by applying what you've learned from working through the guided programming exercises.