jhr.js

//this is a tiny helper method for making JSON Http Requests
//if you want a more comprehensive solution, write it yourself
//
//the callback function will receive two arguments: the response,
// parsed as JSON, and the xhr object used inside jhr, with an added
// responseJSON property (you can probably guess what it is)
//
//this always sends a POST request, and the data is always serialized to JSON
//
//returns the xhr object used
var JHR = function ( url, data, fun ) {
	var xhr = new XMLHttpRequest();
	xhr.responseJSON = null;
	
	xhr.open( 'POST', url );
	xhr.setRequestHeader( 'Content-Type', 'application/json' );
	
	xhr.addEventListener( 'load',  function () {
		//my old man once told me "Zirak, sometimes, you must face the dangers
		// of life head on". he then threw me in a shark tank. but I'm sure it
		// applies here too.
		//...I was only 7
		xhr.responseJSON = JSON.parse( xhr.responseText );
		
		fun( xhr.responseJSON, xhr );
	});

	xhr.send( JSON.stringify(data) );
	
	return xhr;
};

//compatibility: anything supporting XMLHttpRequest2 http://caniuse.com/xhr2