On Feb 11, 11:21 am, doug <douglass_da...@earthlink.net> wrote:
> I have read about Javascript and scope and I still don't really
> understand it completely, particularly when it comes to Ajax.Updater.
>
> I don't really understand, for example why, if there is a variable
> window.myvar, some Javascript code would not be able to access it, and
> instead it would be undefined for that code. I was thinking
> window.myvar was "global"
Without seeing the code, only guesses can be provided in response to
that. It may be that myvar hasn't been assigned a value when you try
to access it, or the code is trying to access a different window
object, or the identifier resolves to a property on some other object,
and so on.
> But, my question is, is there a way I can do some type of alert() and
> have it print out what scope it is executing in?
Javascript only has 2 scopes: global and function. However, there can
be more than one global object in a web page (e.g. frames).
There is a long and detailed article on closures here that includes
how scope works:
<URL: http://www.jibbering.com/faq/faq_notes/closures.html >
It is a bit daunting when you first start to read it, but stick at it,
you may take a week or so of solid work to get all the way through and
fully understand it. But if you take the time, by the end you will
have a very good idea of how identifier (hence scope) and property
name resolution works in javascript.
--
Rob
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