Comments on: JavaScript Scope

By: dom

dom — Thu, 28 Aug 2008 09:23:38 +0000

@märtin: You’re absolutely correct. But this is trivial example to demonstrate scope within JavaScript, not show how to access stuff within events.

Thanks for the tip though, I’ll have to remember that one.

By: märtin

märtin — Thu, 28 Aug 2008 07:48:26 +0000

when you just want to alert the item (element) to which the event is attached you can easily refer to “this” (or some property of your event object, depending on toolkit used) inside the event function. the attempt to pass an element to its own event seems pointless to me. When i need to access some data from within an event i usually fill the element’s rel-attr with a key(number) needed to access the corresponding data from some array/obj.

bäst

märtin

By: dom

dom — Wed, 27 Aug 2008 18:55:55 +0000

@Simon: I certainly could do that (and probably would in my own code, though I confess it doesn’t scan that well to me). But it’s an aside here. The main point is that JavaScript doesn’t give you new scope when you open up a pair of curlies.

By: Simon Proctor

Simon Proctor — Wed, 27 Aug 2008 18:37:23 +0000

Why not just use a closure inline?

  item.onclick = function( tmpitem ) {
       return function() { alert("item is " + tmpitem); }
      }(item);

By: dom

dom — Wed, 27 Aug 2008 09:08:19 +0000

Please excuse the direct assignment to onclick. Under normal circumstances I would use some form of addEvent()…