How to implement a background execution in JavaScript?

Question

For example, I would like to download part of data from the server when I click one button, and downloading other parts in background. How to implement this?

Javascript, in browsers, do have threads, now; they're called Web Workers: developer.mozilla.org/en-US/docs/Web/Guide/Performance/… — JayC
– JayC, Commented Jul 8, 2013 at 20:46
@aaronman he didn't mention threads. They're but one mechamism of concurrency. — cirrus
– cirrus, Commented Jul 8, 2013 at 20:47

Mehdi Karamosly · Accepted Answer · 2013-07-08 21:52:51Z

2

If you are targetting HTML5 compatible browsers take a look at Web Workers :

http://www.html5rocks.com/en/tutorials/workers/basics/

Background processes with web workers:

http://www.youtube.com/watch?v=VIdkYaLbzMs

answered Jul 8, 2013 at 21:52

Mehdi Karamosly

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Uriel · Accepted Answer · 2013-07-08 20:50:14Z

0

You have only one execution thread, so you will have to play with setInterval() and clearInterval() and execute your code based on timers :

var iv= setInterval(function(){ alert("Running now!"); }, 3000);

Clear the periodic function with :

clearInterval(iv);

answered Jul 8, 2013 at 20:50

Uriel

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2 Comments

injoy Over a year ago

What if the interval is not decided?

Uriel Over a year ago

You probably have a start condition, so you can check it in the provided function before anything else.

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