gitbook.require(["gitbook", "lodash", "jQuery"], function(gitbook, _, $) { var gs = gitbook.storage; gitbook.events.bind("start", function(e, config) { // add the Edit button (edit on Github) var edit = config.edit; if (edit && edit.link) gitbook.toolbar.createButton({ icon: 'fa fa-edit', label: edit.text || 'Edit', position: 'left', onClick: function(e) { e.preventDefault(); window.open(edit.link); } }); // add the History button (file history on Github) var history = config.history; if (history && history.link) gitbook.toolbar.createButton({ icon: 'fa fa-history', label: history.text || 'History', position: 'left', onClick: function(e) { e.preventDefault(); window.open(history.link); } }); // add the Download button var down = config.download; var normalizeDownload = function() { if (!down || !(down instanceof Array) || down.length === 0) return; if (down[0] instanceof Array) return down; return $.map(down, function(file, i) { return [[file, file.replace(/.*[.]/g, '').toUpperCase()]]; }); }; down = normalizeDownload(down); if (down) if (down.length === 1 && /[.]pdf$/.test(down[0][0])) { gitbook.toolbar.createButton({ icon: 'fa fa-file-pdf-o', label: down[0][1], position: 'left', onClick: function(e) { e.preventDefault(); window.open(down[0][0]); } }); } else { gitbook.toolbar.createButton({ icon: 'fa fa-download', label: 'Download', position: 'left', dropdown: $.map(down, function(item, i) { return { text: item[1], onClick: function(e) { e.preventDefault(); window.open(item[0]); } }; }) }); } // add the Information button var info = ['Keyboard shortcuts (<> indicates arrow keys):', '/: navigate to previous/next page', 's: Toggle sidebar']; if (config.search !== false) info.push('f: Toggle search input ' + '(use //Enter in the search input to navigate through search matches; ' + 'press Esc to cancel search)'); gitbook.toolbar.createButton({ icon: 'fa fa-info', label: 'Information about the toolbar', position: 'left', onClick: function(e) { e.preventDefault(); window.alert(info.join('\n\n')); } }); // highlight the current section in TOC var href = window.location.pathname; href = href.substr(href.lastIndexOf('/') + 1); if (href === '') href = 'index.html'; var li = $('a[href^="' + href + location.hash + '"]').parent('li.chapter').first(); var summary = $('ul.summary'), chaps = summary.find('li.chapter'); if (li.length === 0) li = chaps.first(); li.addClass('active'); chaps.on('click', function(e) { chaps.removeClass('active'); $(this).addClass('active'); gs.set('tocScrollTop', summary.scrollTop()); }); var toc = config.toc; // collapse TOC items that are not for the current chapter if (toc && toc.collapse) (function() { var type = toc.collapse; if (type === 'none') return; if (type !== 'section' && type !== 'subsection') return; // sections under chapters var toc_sub = summary.children('li[data-level]').children('ul'); if (type === 'section') { toc_sub.hide() .parent().has(li).children('ul').show(); } else { toc_sub.children('li').children('ul').hide() .parent().has(li).children('ul').show(); } li.children('ul').show(); var toc_sub2 = toc_sub.children('li'); if (type === 'section') toc_sub2.children('ul').hide(); summary.children('li[data-level]').find('a') .on('click.bookdown', function(e) { if (href === $(this).attr('href').replace(/#.*/, '')) $(this).parent('li').children('ul').toggle(); }); })(); // add tooltips to the 's that are truncated $('a').each(function(i, el) { if (el.offsetWidth >= el.scrollWidth) return; if (typeof el.title === 'undefined') return; el.title = el.text; }); // restore TOC scroll position var pos = gs.get('tocScrollTop'); if (typeof pos !== 'undefined') summary.scrollTop(pos); // highlight the TOC item that has same text as the heading in view as scrolling if (toc && toc.scroll_highlight !== false) (function() { // scroll the current TOC item into viewport var ht = $(window).height(), rect = li[0].getBoundingClientRect(); if (rect.top >= ht || rect.top <= 0 || rect.bottom <= 0) { summary.scrollTop(li[0].offsetTop); } // current chapter TOC items var items = $('a[href^="' + href + '"]').parent('li.chapter'), m = items.length; if (m === 0) { items = summary.find('li.chapter'); m = items.length; } if (m === 0) return; // all section titles on current page var hs = bookInner.find('.page-inner').find('h1,h2,h3'), n = hs.length, ts = hs.map(function(i, el) { return $(el).text(); }); if (n === 0) return; var scrollHandler = function(e) { var ht = $(window).height(); clearTimeout($.data(this, 'scrollTimer')); $.data(this, 'scrollTimer', setTimeout(function() { // find the first visible title in the viewport for (var i = 0; i < n; i++) { var rect = hs[i].getBoundingClientRect(); if (rect.top >= 0 && rect.bottom <= ht) break; } if (i === n) return; items.removeClass('active'); for (var j = 0; j < m; j++) { if (items.eq(j).children('a').first().text() === ts[i]) break; } if (j === m) j = 0; // highlight the chapter title // search bottom-up for a visible TOC item to highlight; if an item is // hidden, we check if its parent is visible, and so on while (j > 0 && items.eq(j).is(':hidden')) j--; items.eq(j).addClass('active'); }, 250)); }; bookInner.on('scroll.bookdown', scrollHandler); bookBody.on('scroll.bookdown', scrollHandler); })(); // do not refresh the page if the TOC item points to the current page $('a[href="' + href + '"]').parent('li.chapter').children('a') .on('click', function(e) { bookInner.scrollTop(0); bookBody.scrollTop(0); return false; }); var toolbar = config.toolbar; if (!toolbar || toolbar.position !== 'static') { var bookHeader = $('.book-header'); bookBody.addClass('fixed'); bookHeader.addClass('fixed') .css('background-color', bookBody.css('background-color')) .on('click.bookdown', function(e) { // the theme may have changed after user clicks the theme button bookHeader.css('background-color', bookBody.css('background-color')); }); } }); gitbook.events.bind("page.change", function(e) { // store TOC scroll position var summary = $('ul.summary'); gs.set('tocScrollTop', summary.scrollTop()); }); var bookBody = $('.book-body'), bookInner = bookBody.find('.body-inner'); var chapterTitle = function() { return bookInner.find('.page-inner').find('h1,h2').first().text(); }; var saveScrollPos = function(e) { // save scroll position before page is reloaded gs.set('bodyScrollTop', { body: bookBody.scrollTop(), inner: bookInner.scrollTop(), focused: document.hasFocus(), title: chapterTitle() }); }; $(document).on('servr:reload', saveScrollPos); // check if the page is loaded in an iframe (e.g. the RStudio preview window) var inIFrame = function() { var inIframe = true; try { inIframe = window.self !== window.top; } catch (e) {} return inIframe; }; if (inIFrame()) { $(window).on('blur unload', saveScrollPos); } $(function(e) { var pos = gs.get('bodyScrollTop'); if (pos) { if (pos.title === chapterTitle()) { if (pos.body !== 0) bookBody.scrollTop(pos.body); if (pos.inner !== 0) bookInner.scrollTop(pos.inner); } } if ((pos && pos.focused) || !inIFrame()) bookInner.find('.page-wrapper').focus(); // clear book body scroll position gs.remove('bodyScrollTop'); }); });