JavaScript asynchronous programming

Question

Recently, I began studying JavaScript, and I reached a topic about asynchronous coding, or some refer to it as function parameter or callback (node.js to be more specific).

I tested some stuff with it, but can`t get the idea of it. For example

window.addEventListener("click", function(){ alert("HELO"); }, true);

will do nothing. Can somebody explain in short what exactly is the idea behind asynchronous coding and what are these callbacks, also a 3-4 line example will be appreciated.

@nalply Like Carl said in his answer, the window object is not part of the node.js environment. You are executing that code in Chrome which has the window object. — abelito
– abelito, Commented Jan 14, 2012 at 9:57

Carl Bergquist · Accepted Answer · 2012-01-14 09:38:49Z

5

The code you have written requires the window object which is not a part of the node.js environment.

I recommend watching ryan dahl's introduction to node.js

answered Jan 14, 2012 at 9:38

Carl Bergquist

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4 Comments

abelito Over a year ago

From the video, "node is basically a set of libraries on top of Google's V8 engine to create networking applications [written in javascript]". The video is very, very helpful.

Ilian Zapryanov Over a year ago

Thanks for replying. JS is kind of new to me so my questions may still be lame :)

Carl Bergquist Over a year ago

It's not a lame question. And if you wanna learn more about javascript I really recommend Douglas Crockfords book amazon.com/JavaScript-Good-Parts-Douglas-Crockford/dp/…

Ilian Zapryanov Over a year ago

I

ve found that book and I think that this book http://www.amazon.com/gp/product/1593272820?ie=UTF8&tag=marijhaver-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1593272820 is good for JS too with Crockford

s.

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