Re: Value returned for missing DOMStringList properties

Sylvain Pasche wrote:

> DOMStringList is currently returning null when calling item() with 
> properties that don't exist, and the empty string when getting a missing 
> indexed property. Here's an example with a document that has less than 
> 100 style sheet sets:
> 
> document.styleSheetSets.item(100)
>     -> null
> document.styleSheetSets[100]
>     -> ""
> 
> Apparently, the behavior when getting missing indexed properties isn't 
> specified in the DOM Level 3 Core specification yet [1].

The ECMAScript binding 
(http://www.w3.org/TR/DOM-Level-3-Core/ecma-script-binding.html) clearly 
says:

   "Objects that implement the DOMStringList interface:

     Properties of objects that implement the DOMStringList interface:

         length
             This read-only property is a Number.

     Functions of objects that implement the DOMStringList interface:

         item(index)
             This function returns a String.
             The index parameter is a Number.
             Note: This object can also be dereferenced using square 
bracket notation (e.g. obj[1]). Dereferencing with an integer index is 
equivalent to invoking the item function with that index."

so with JavaScript whether you use someDOMStringList.item(100) or 
someDOMStringList[100] should not matter, the result should be the same.



-- 

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/