On Jun 28, 2006, at 9:03 PM, [EMAIL PROTECTED] wrote:
>
> I took a look at jQuery. I saw this in the doco:
>
> "Loading jQuery first, then Prototype, will cause your code to break -
> as a reminder, jQuery throws an exception saying: "You are overwriting
> jQuery, please include jQuery last."
>
> Bob, am I to assume that this is what you mean by other libraries
> "mangling" object.prototype? ;)
Actually in this case I'm pretty sure it's a global namespace
conflict. jQuery and Prototype both need a global $ function in order
to operate. I think the jQuery guys pray that their function is a
superset of what Prototype's does, but that's probably not the case
anymore now that Prototype's $ function does more crap.
MochiKit will export a global $ function, but it doesn't need it to
be global in order to function properly (in that case, it's actually
called getElement internally). The exports are merely a convenience
to make your code shorter. One of the reasons that MochiKit is larger
than the hackier libraries like Prototype is that it is very
defensively programmed and requires lots of fully qualified
references to other parts of itself.
MochiKit could be (somewhat dramatically) shorted by using closures
instead, but closures don't allow for hot-patching. Right now, if you
find a deficiency in a MochiKit function or would like to add tracing
or something, you can simply patch in your own version at runtime. If
a closure was used, you'd never be able to acquire a reference to the
activation objects that contain the internal references.
For example:
<script type="text/javascript" src="MochiKit/MochiKit.js"></script>
<script type="text/javascript">
/*
Replace map with a tracing version for debugging this page. Even
MochiKit's
internal usage of map will be affected by this change!
*/
// use a function here so we don't pollute the global namespace with
"oldMap"
(function () {
var oldMap = MochiKit.Base.map;
MochiKit.Base.map = function () {
log('oldMap being called: ' + repr(list(arguments)));
return oldMap.apply(arguments);
};
})();
</script>
-bob
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