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.
kba
19.5k6 gold badges65 silver badges90 bronze badges
asked Jan 14, 2012 at 9:27
Ilian Zapryanov
1,2622 gold badges18 silver badges33 bronze badges
-
Check out a tutorial, there are bunch of them!KARASZI István– KARASZI István2012年01月14日 09:29:35 +00:00Commented Jan 14, 2012 at 9:29
-
1question is too broad in scopeLloyd– Lloyd2012年01月14日 09:40:34 +00:00Commented Jan 14, 2012 at 9:40
-
@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– abelito2012年01月14日 09:57:52 +00:00Commented Jan 14, 2012 at 9:57
-
duh, didn't see that the question was about node.jsnalply– nalply2012年01月14日 18:26:36 +00:00Commented Jan 14, 2012 at 18:26
1 Answer 1
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
3,9622 gold badges28 silver badges42 bronze badges
Sign up to request clarification or add additional context in comments.
4 Comments
abelito
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
Thanks for replying. JS is kind of new to me so my questions may still be lame :)
Carl Bergquist
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
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 Crockfords.lang-js