Add JSONP to Async

Hi. I wrote code for JSONP to Async.

DEMO

http://rails2u.com/misc/MochiKitAsyncJSONP/

DEMO is able to get JSON from del.icio.us by JSONP.

DEMO's Implementation example code is like this.

var d = sendJSONPRequest('http://del.icio.us/feeds/json/' + 
$('uid').value, 'callback'); 
d.addCallback(function(json) { 
    replaceChildNodes($('result'), UL(null, map(function(data) { 
        return LI(null, A({href: data.u}, data.d)); 
    }, json))); 
}); 

sendJSONPrequest

sendJSONPrequest is MochiKit.Async's function. {{ sendJSONPRequest: function (url, callbackQuery, timeout/* = 30 */, /* optional */scriptElementAttr) }}

sendJSONPRequest's arguments

- First argument is JSON url.

example: http://del.icio.us/feeds/json/gorou

- Second Arguments is query callback params name. If del.icio.us's API callback name is 'callback'.

- Third argument is request timeout second. If over timeout second. call errback. But don't work opera... Opera's element.appendChild(script) don't ASYNC.

- Forth argument is script element attributes. example:

sendJSONPRequest(url, callback_query, timeout, { 
  charset: 'utf-8' 
}); 

fix WinIE bug

Thanks for the patch, but JSONP should behave like to loadJSONDoc. sendJSONPRequest should return a deferred that you can use to add callbacks and errbacks. This is a good start, but it still needs work.