Hash Change

hashchange.js

// From: https://github.com/futurepress/epub.js/blob/master/reader_src/controllers/controls_controller.js

var hashChanged = function(){
	var hash = window.location.hash.slice(1);
	book.goto(hash);
};

book.on('renderer:locationChanged', function(cfi){
  var cfiFragment = "#" + cfi;

	// Update the History Location
	if(window.location.hash != cfiFragment) {
	  // Add CFI fragment to the history
		history.pushState({}, '', cfiFragment);
	}
});

window.addEventListener("hashchange", hashChanged.bind(this), false);