To our rescue comes Sean Burke, author of the Higher Order Javascript document, who has styled HOJ as a sort of companion to the book Higher Order Perl . In the document, Burke defines a useful function called graft() which allows us to build chunks of DOM documents using really simple object notation. Graft() will feel very familiar to anyone who makes extensive use of the JSON format or who has worked with LISP.

JavaScript is a fully-featured Object-Oriented programming language, on the surface, it shares syntactical similarities with Java and C, but the mentality is quite different, at its core, JavaScript is more similar to functional languages. Inside is a list of JavaScript tips, some offer techniques to simulate features found in C-like languages (such as assertions or static variables), others are meant to improve performance and explore some of the more obscure parts of the web scripting language.

This is an impressive collection (that I found somehere on the Net) of various functions to validate or format string in Javascript. The code is very compact.

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Prototype is a Java Script framework that aims to ease development of dynamic web applications. Its development is driven heavily by the Ruby on Rails framework, but it can be used in any environment.

javascripts quirks by browser release

The MD4, MD5 and SHA-1 algorithms are secure hash functions. They take a string input, and produce a fixed size number - 128 bits for MD4 and MD5; 160 bits for SHA-1. This number is a hash of the input - a small change in the input results in a substantial change in the output. The functions are thought to be secure, in the sense that it would require an enormous amount of computing power to find a string which hashes to a chosen value. In others words, there's no way to decrypt a secure hash. The uses of secure hashes include digital signatures and challenge hash authentication. This document is a good introduction to hashes

You can use the MD5 function in combination with a similar JavaScript function to protect user passwords for logins. The arrangement goes like this: When the user requests the login page, the server generates a random number. It stores this in a session variable as well as sending to the client. When the user clicks submit, JavaScript in the client computes md5(password + random). The server can also generate this hash, because it already knows the password and random number. It uses this to check that the user entered the correct password. The password has not been transmitted in the clear, and next login the random number will be different, so an attacker can't use a "replay attack". JavaScript MD5 is available here: http://pajhome.org.uk/crypt/md5/

Dump() Function - Javascript equivalent of PHP's print_r()

Really easy field validation with Prototype I wanted a robust javascript validation library that was simple to implement and didn't require me do any extra work other than creating the form. My favourite idea for a method of doing this is to utilise the field elements' class attribute to indicate what sort of field it is and hence any validation requirements. There are a few javascript libraries that implement that idea like wForms, but, since I'm currently hell-bent on re-writing all my javascript using Prototype, I thought I'd see how difficult or easy it would be to roll my own. Turns out that this is just the sort of thing that is easy with Prototype. [Updated Again!] : new version 1.2! ( also, A bit of maintenance: version 1.2.1)