Do you know that
XMLHttpRequest is an API that can be used by JavaScript, JScript, VBScript and other web browser scripting languages to transfer and manipulate XML data to and from a web server using HTTP, establishing an independent connection channel between a web page's Client-Side and Server-Side.
The data returned from XMLHttpRequest calls will often be provided by back-end databases. Besides XML, XMLHttpRequest can be used to fetch data in other formats, e.g. JSON or even plain text.
Also interesting
Ajax Theory
How things work
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Introducing the best Javascript Inheritance Technique
Every programmer who's tried to apply classical Object Oriented techniques when developing with JavaScript, has at one time or another asked themselves the question: How do you call or invoke a super class method? Before the Ajax craze got into full swing, this question rarely arose because most developers were only exposed to the language when doing client-side form validation or simple DHTML / DOM element visibility toggling. read full article» -
How to Profile and Optimize Ajax Applications
The first thing to know about profiling happens far, far before you do an optimization session, at the beginning of your project; it is one of the most challenging phases because it requires you to balance two different approaches that people struggle with.
The first rule is to avoid premature optimization at all costs. I have literally been at companies that I've seen destroyed by premature optimizations. read full article»
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