Hello all,
I have a couple questions about the storage spec (I'm reading the June 15th
version at (http://dev.w3.org/html5/webstorage/).
(1) The spec says:
"The object's indices of the supported indexed properties are the numbers in
the range zero to one less than the number of key/value pairs currently present
in the list associated with the object. If the list is empty, then there are no
supported indexed properties."
As far as I can tell, this seems to say I should be able to say something like:
window.localStorage[3]
and get something back (not clear if the key or the value). Am I right in my
interpretation of that paragraph?
I saw some discussion earlier about whether something like localStorage[3] was
meaningful, but I didn't find the resolution. It does seem
undesirable/confusing to me. And none of the browsers I've tried this with do
this. So, I'm just confused, and probably misunderstanding "indices of the
supported indexed properties". Thanks for any clarification.
(2) The spec also says:
"The names of the supported named properties on a Storage object are the keys
of each key/value pair currently present in the list associated with the
object."
I read that (possibly/probably wrongly) as saying I should be able to say
window.localStorage.setItem("foo", "bar");
myVariable = window.localStorage["foo"];
and now myVariable will have "bar".
If my reading is right (and it is the behavior I see in a couple browsers) this
makes me very nervous, because I can do something like:
window.localStorage.setItem("length", "a value we computer");
window.localStorage.setItem("clear", "something that is transparent");
which of course allows:
window.localStorage["length"];
window.localStorage["clear"];
but in the browsers I've looked at, this (of course) also kinda messes up
things like:
for (index = 0; index < window.localStorage.length; index++) {
// whatever
}
window.localStorage.clear();
since length is now not a number, and clear isn't a function.
Why is this a desirable feature?
(3) Real nitpicking here:
The IDL for the Storage interface says
setter creator void setItem(in DOMString key, in any data);
but the text says
The setItem(key, value) method
Note the name of the second parameter is different between these.
Thank you. Despite my nitpicking above, I really appreciate the presence of
this spec! :-)
david
p.s. I'm still coming up to speed on these specs, so if I'm just
misunderstanding something basic, direct me to TFM that I should R.
