Random quote generator with get new quote and tweet buttons.

getQuote.js

// Object to hold quotes and authors
var myObj = null;
// Indexes for current quote and new quote so same quote isn't repeated back to back
var randQuote = 0;
var newQuote = 0;

$(document).ready(function() {
  // Get a quote
	getQuote();
  // On click listener on element with id of getQuoteBtn to get a new quote
	$('#getQuoteBtn').on('click', function() {
		newQuote = randQuote;
    // Get a different quote
		while (newQuote == randQuote) {
			newQuote = Math.floor(Math.random() * myObj.length);
		}
		randQuote = newQuote;
      // Assign quote to element with id of quote
    	$('#quote').text(myObj[randQuote].Quote);
      // Assign author to element with id of author
    	$('#author').text(' - ' + myObj[randQuote].Author);
      // Remove spaces and special chars from author name for hashtag in tweet
    	var author = myObj[randQuote].Author.replace(/[^a-z0-9\s]/gi, '').replace(/[_\s]/g, '');
      // Create tweet link for element with id of tweetThis
    	$('#tweetThis').attr('href', 'https://twitter.com/intent/tweet?text=' 
    		+ encodeURIComponent(myObj[randQuote].Quote.trim()) + '&hashtags=quotes,' + author);

	});
});

function getQuote() {
  // Get quotes from JSON
	var xmlhttp = new XMLHttpRequest();
	xmlhttp.onreadystatechange = function() {
		if (this.readyState == 4 && this.status == 200) {
        	myObj = JSON.parse(this.responseText);
          // Get a random quote
        	randQuote = Math.floor(Math.random() * myObj.length);
          // Assign quote to element with id of quote
        	$('#quote').text(myObj[randQuote].Quote);
          // Assign author to element with id of author
        	$('#author').text(' - ' + myObj[randQuote].Author);
          // Remove spaces and special chars from author name for hashtag in tweet
        	var author = myObj[randQuote].Author.replace(/[^a-z0-9\s]/gi, '').replace(/[_\s]/g, '');
          // Create tweet link for element with id of tweetThis
        	$('#tweetThis').attr('href', 'https://twitter.com/intent/tweet?text=' 
        		+ encodeURIComponent(myObj[randQuote].Quote.trim()) + '&hashtags=quotes,' + author);
		}
	};
  // Get quotes from JSON file (change path to reflect your JSON)
  // JSON should have keys of "Quote" and "Author"
	xmlhttp.open("GET", "js/quotes.json", true);
	xmlhttp.send();
}