Comments on: Javascript addEventListener – peculiarity or bug?

By: zahlenzerkleinerer » Blog Archive » JavaScript addEventListener im for loop

Sat, 24 Jan 2009 11:43:09 +0000

[...] das Objekt zu schauen der den Event ausgelöst hat, gelang nicht auf den ersten Blick. Bis ich folgende Lösung im Netz gefunden habe, es lohnt sich sehr oft eine Nacht über dem Problem schalfen zu gehen. for (var [...]

By: Rick

Rick — Wed, 16 Jul 2008 20:16:11 +0000

I just ran across this post while searching for something else.

What you’re seeing in the first example is that you’re referencing the loop variable i from your anonymous function. Once the function is executed (*after* termination of the loop), the value is 10. So whenever the event listener is triggered, it gets the value of i existing at that time, and passes it to test().

Java or other strongly-typed language would complain about referencing a local variable in an anonymous context.

By: a.little

a.little — Fri, 21 Sep 2007 15:24:59 +0000

Hi, Cheers, yes it does look like it’s doing something like that, was just a bit of an unexpected result to me!

By: ssg31415926

ssg31415926 — Fri, 21 Sep 2007 15:13:42 +0000

I don’t know anything about JavaScript but…

won’t 10 be the value that i has at the end of the loop?

I think your script is setting up the elements with the function ‘test(i)’ not e.g. ‘test(1)’ or ‘test(2)’ or whatever.