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define([
"jQuery",
"core/progress",
"core/exercise",
"core/quiz"
], function($, progress, exercises, quiz) {
var prev, next;
var updateHistory = function(url, title) {
history.pushState({ path: url }, title, url);
};
var handleNavigation = function(url, push) {
if (typeof history.pushState === "undefined") {
// Refresh the page to the new URL if pushState not supported
location.href = url;
return
}
return $.get(url)
.done(function (html) {
html = html.replace( /<(\/?)(html|head|body)([^>]*)>/ig, function(a,b,c,d){
return '<' + b + 'div' + ( b ? '' : ' data-element="' + c + '"' ) + d + '>';
});
var $page = $(html);
var $pageHead = $page.find("[data-element=head]");
$("head").html($pageHead.html());
$('.book-header').html($page.find('.book-header').html());
$('.book-body').html($page.find('.book-body').html());
$('.book-summary').html($page.find('.book-summary').html());
if (push) updateHistory(url, null);
preparePage();
})
.fail(function () {
location.href = url;
});
};
var preparePage = function() {
// Bind exercises/quiz
exercises.init();
quiz.init();
// Show progress
progress.show();
// Reset scroll
$(".book-body").scrollTop(0);
// Focus on content
$(".book-body").focus();
};
var handlePagination = function (e) {
e.stopPropagation();
e.preventDefault();
var url = $(this).attr('href');
if (url) handleNavigation(url, true);
};
var goNext = function() {
var url = $(".navigation-next").attr("href");
if (url) handleNavigation(url, true);
};
var goPrev = function() {
var url = $(".navigation-prev").attr("href");
if (url) handleNavigation(url, true);
};
var init = function() {
// Prevent cache so that using the back button works
// See: http://stackoverflow.com/a/15805399/983070
$.ajaxSetup({
cache: false
});
// Recreate first page when the page loads.
history.replaceState({ path: window.location.href }, '');
// Back Button Hijacking :(
window.onpopstate = function (event) {
if (event.state === null) {
return;
}
return handleNavigation(event.state.path, false);
};
$(document).on('click', ".navigation-prev", handlePagination);
$(document).on('click', ".navigation-next", handlePagination);
$(document).on('click', ".summary [data-path] a", handlePagination);
// Prepare current page
preparePage();
};
return {
init: init,
goNext: goNext,
goPrev: goPrev
};
});
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