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var $ = require('jquery');
var url = require('url');
var events = require('./events');
var state = require('./state');
var loading = require('./loading');
var usePushState = (typeof history.pushState !== 'undefined');
function handleNavigation(relativeUrl, push) {
var uri = url.resolve(window.location.pathname, relativeUrl);
if (!usePushState) {
// Refresh the page to the new URL if pushState not supported
location.href = relativeUrl;
return;
}
return loading.show($.get(uri)
.done(function (html) {
// Push url to history
if (push) history.pushState({ path: uri }, null, uri);
// Replace html content
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]');
var $pageBody = $page.find('.book');
// Merge heads
// !! Warning !!: we only update necessary portions to avoid strange behavior (page flickering etc ...)
// Update title
document.title = $pageHead.find('title').text();
// Reference to $('head');
var $head = $('head');
// Update next & prev <link> tags
// Remove old
$head.find('link[rel=prev]').remove();
$head.find('link[rel=next]').remove();
// Add new next * prev <link> tags
$head.append($pageHead.find('link[rel=prev]'));
$head.append($pageHead.find('link[rel=next]'));
// Merge body
var bodyClass = $('.book').attr('class');
var scrollPosition = $('.book-summary .summary').scrollTop();
$pageBody.toggleClass('with-summary', $('.book').hasClass('with-summary'));
$('.book').replaceWith($pageBody);
$('.book').attr('class', bodyClass);
$('.book-summary .summary').scrollTop(scrollPosition);
// Update state
state.update($('html'));
preparePage();
})
.fail(function (e) {
location.href = relativeUrl;
}));
}
function updateNavigationPosition() {
var bodyInnerWidth, pageWrapperWidth;
bodyInnerWidth = parseInt($('.body-inner').css('width'), 10);
pageWrapperWidth = parseInt($('.page-wrapper').css('width'), 10);
$('.navigation-next').css('margin-right', (bodyInnerWidth - pageWrapperWidth) + 'px');
}
function notifyPageChange() {
events.trigger('page.change');
}
function preparePage(notify) {
var $bookBody = $('.book-body');
var $bookInner = $bookBody.find('.body-inner');
var $pageWrapper = $bookInner.find('.page-wrapper');
// Update navigation position
updateNavigationPosition();
// Focus on content
$pageWrapper.focus();
// Reset scroll
$bookInner.scrollTop(0);
$bookBody.scrollTop(0);
// Notify
if (notify !== false) notifyPageChange();
}
function isLeftClickEvent(e) {
return e.button === 0;
}
function isModifiedEvent(e) {
return !!(e.metaKey || e.altKey || e.ctrlKey || e.shiftKey);
}
function handlePagination(e) {
if (isModifiedEvent(e) || !isLeftClickEvent(e)) {
return;
}
e.stopPropagation();
e.preventDefault();
var url = $(this).attr('href');
if (url) handleNavigation(url, true);
}
function goNext() {
var url = $('.navigation-next').attr('href');
if (url) handleNavigation(url, true);
}
function goPrev() {
var url = $('.navigation-prev').attr('href');
if (url) handleNavigation(url, true);
}
function init() {
// 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);
$(window).resize(updateNavigationPosition);
// Prepare current page
preparePage(false);
}
module.exports = {
init: init,
goNext: goNext,
goPrev: goPrev,
notify: notifyPageChange
};
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