script.js

var tweetBoxes = [];
var idNum = 0;

$(function(){
	document.getElementById('draft').addEventListener("input", onInput, false);
});

function onInput(){
	document.getElementById('count').innerHTML = document.getElementById('draft').value.length;
	splitTweets();
}

function splitTweets(){
	parseTweetString();
}

function parseTweetString(){
	var boxes = [];
	var words = [];
	var j = 0;

	words = document.getElementById('draft').value.split(" ");
	var tempTweet = [];
	for (var i = 0; i < words.length; i++) {
		tempTweet.push(words[i]);
		if(tempTweet.join(" ").length < 134){
			boxes[j] = tempTweet.join(" ");
		}else{
			tempTweet.pop();
			boxes[j] = tempTweet.join(" ");
			tempTweet = [];
			tempTweet.push(words[i]);
			j++;
		}
	};

	if(boxes.length > tweetBoxes.length){
		var diff = boxes.length - tweetBoxes.length;
		for (var i = 0; i < diff; i++) {
			new TweetBox(idNum, idNum);
			idNum++;
		}
	}
	for (var i = 0; i < tweetBoxes.length; i++) {
		tweetBoxes[i].domElement.value = boxes[i];
		var tweetCount = i + 1;
		tweetBoxes[i].domElement.value += " (" + tweetCount + "/" + tweetBoxes.length + ")";
		document.getElementById('count' + tweetBoxes[i].idNum).innerHTML = tweetBoxes[i].domElement.value.length;

	};
}


function urls(){
	var urls = countURLs();
	var urlChars = 0;
	var adjustment= 0;
	if(urls){
		for (var i = urls.length - 1; i >= 0; i--) {
			urlChars += urls[i].length;
		};
		adjustment = urls.length*23;
	}
	var chars = self.charLength() - urlChars + adjustment;
	document.getElementById('count' + self.idNum).innerHTML = chars;
	self.checkMaxLength();
	self.isEmpty();

}

function countURLs(){
	var str = this.domElement.value;
	var re = /(^|\s)((https?:\/\/)?[\w-]+(\.[\w-]+)+\.?(:\d+)?(\/\S*)?)/gi;
	var res = str.match(re);
	return res;
}