Crossdomain JSONP request via YQL

requestCrossDomain.js

	var url_str = 'http://www.google.com/ig/api?weather=Berlin+Germany&hl=de';
	requestCrossDomain(url_str, function(json) {
		// check the real output at YQL console
		// http://goo.gl/Z9XHu
		console.log(json.xml_api_reply.weather)
	});


	// Accepts a url and a callback function to run.
	// returns jsonp
	
	function requestCrossDomain( site, callback ) {
		
		// If no url was passed, exit.
		if ( !site ) {
			alert('No site was passed.');
			return false;
		}
	
		// Take the provided url, and add it to a YQL query. Make sure you encode it!
		var yql = 'http://query.yahooapis.com/v1/public/yql?q=' + encodeURIComponent('select * from xml where url="' + site + '"') + '&format=json&callback=?';
	
		// Request that YSQL string, and run a callback function.
		// Pass a defined function to prevent cache-busting.
		$.getJSON( yql, cbFunc );
	
		function cbFunc(data) {
		// If we have something to work with...
		if (data.query.results !== null)  {
			data = data.query.results;
			// If the user passed a callback, and it
			// is a function, call it, and send through the data var.
			if ( typeof callback === 'function') {
				callback(data);
			}
		}
		// Else, Maybe we requested a site that doesn't exist, and nothing returned.
		else throw new Error('Nothing returned from getJSON.');
		}
	}