diff options
Diffstat (limited to 'juick-www/src/main/assets/scripts.js')
| -rw-r--r-- | juick-www/src/main/assets/scripts.js | 802 |
1 files changed, 0 insertions, 802 deletions
diff --git a/juick-www/src/main/assets/scripts.js b/juick-www/src/main/assets/scripts.js deleted file mode 100644 index 0d9a8846..00000000 --- a/juick-www/src/main/assets/scripts.js +++ /dev/null @@ -1,802 +0,0 @@ -require('whatwg-fetch'); -require('element-closest'); -require('classlist.js'); -require('url-search-params-polyfill'); -let Awesomplete = require('awesomplete'); -import * as killy from './embed'; - -if (!('remove' in Element.prototype)) { // Firefox <23 - Element.prototype.remove = function () { - if (this.parentNode) { - this.parentNode.removeChild(this); - } - }; -} - -NodeList.prototype.forEach = Array.prototype.forEach; -HTMLCollection.prototype.forEach = Array.prototype.forEach; - -NodeList.prototype.filter = Array.prototype.filter; -HTMLCollection.prototype.filter = Array.prototype.filter; - -Element.prototype.selectText = function () { - let d = document; - if (d.body.createTextRange) { - let range = d.body.createTextRange(); - range.moveToElementText(this); - range.select(); - } else if (window.getSelection) { - let selection = window.getSelection(); - let rangeSel = d.createRange(); - rangeSel.selectNodeContents(this); - selection.removeAllRanges(); - selection.addRange(rangeSel); - } -}; - -function autosize(el) { - let offset = (!window.opera) - ? (el.offsetHeight - el.clientHeight) - : (el.offsetHeight + parseInt(window.getComputedStyle(el, null).getPropertyValue('border-top-width'))); - - let resize = function (el) { - el.style.height = 'auto'; - el.style.height = (el.scrollHeight + offset) + 'px'; - }; - - if (el.addEventListener) { - el.addEventListener('input', () => resize(el)); - } else if (el.attachEvent) { - el.attachEvent('onkeyup', () => resize(el)); - } -} - -function evilIcon(name) { - return `<div class="icon icon--${name}"><svg class="icon__cnt"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#${name}-icon"></use></svg></div>`; -} - -/* eslint-disable only-ascii/only-ascii */ -const translations = { - 'en': { - 'message.inReplyTo': 'in reply to', - 'message.reply': 'Reply', - 'message.likeThisMessage?': 'Recommend this message?', - 'postForm.pleaseInputMessageText': 'Please input message text', - 'postForm.upload': 'Upload', - 'postForm.newMessage': 'New message...', - 'postForm.imageLink': 'Link to image', - 'postForm.imageFormats': 'JPG/PNG, up to 10 MB', - 'postForm.or': 'or', - 'postForm.tags': 'Tags (space separated)', - 'postForm.submit': 'Send', - 'comment.writeComment': 'Write a comment...', - 'shareDialog.linkToMessage': 'Link to message', - 'shareDialog.messageNumber': 'Message number', - 'shareDialog.share': 'Share', - 'loginDialog.pleaseIntroduceYourself': 'Please introduce yourself', - 'loginDialog.registeredAlready': 'Registered already?', - 'loginDialog.username': 'Username', - 'loginDialog.password': 'Password', - 'loginDialog.facebook': 'Login with Facebook', - 'loginDialog.vk': 'Login with VK', - 'error.error': 'Error' - }, - 'ru': { - 'message.inReplyTo': 'в ответ на', - 'message.reply': 'Ответить', - 'message.likeThisMessage?': 'Рекомендовать это сообщение?', - 'postForm.pleaseInputMessageText': 'Пожалуйста, введите текст сообщения', - 'postForm.upload': 'загрузить', - 'postForm.newMessage': 'Новое сообщение...', - 'postForm.imageLink': 'Ссылка на изображение', - 'postForm.imageFormats': 'JPG/PNG, до 10Мб', - 'postForm.or': 'или', - 'postForm.tags': 'Теги (через пробел)', - 'postForm.submit': 'Отправить', - 'comment.writeComment': 'Написать комментарий...', - 'shareDialog.linkToMessage': 'Ссылка на сообщение', - 'shareDialog.messageNumber': 'Номер сообщения', - 'shareDialog.share': 'Поделиться', - 'loginDialog.pleaseIntroduceYourself': 'Пожалуйста, представьтесь', - 'loginDialog.registeredAlready': 'Уже зарегистрированы?', - 'loginDialog.username': 'Имя пользователя', - 'loginDialog.password': 'Пароль', - 'loginDialog.facebook': 'Войти через Facebook', - 'loginDialog.vk': 'Войти через ВКонтакте', - 'error.error': 'Ошибка' - } -}; -/* eslint-enable only-ascii/only-ascii */ - -function getLang() { - return (window.navigator.languages && window.navigator.languages[0]) - || window.navigator.userLanguage - || window.navigator.language; -} -function i18n(key, lang = undefined) { - const fallbackLang = 'ru'; - lang = lang || getLang().split('-')[0]; - return (translations[lang] && translations[lang][key]) - || translations[fallbackLang][key] - || key; -} - -var ws, - pageTitle; - -function initWS() { - let url = (window.location.protocol === 'https:' ? 'wss' : 'ws') + ':' - + '//api.juick.com/ws/'; - let hash = document.getElementById('body').getAttribute('data-hash'); - if (hash) { - url += '?hash=' + hash; - } else { - let content = document.getElementById('content'); - if (content) { - let pageMID = content.getAttribute('data-mid'); - if (pageMID) { - url += pageMID; - } - } - } - - ws = new WebSocket(url); - ws.onopen = function () { - console.log('online'); - if (!document.querySelector('#wsthread')) { - var d = document.createElement('div'); - d.id = 'wsthread'; - d.addEventListener('click', nextReply); - document.querySelector('body').appendChild(d); - pageTitle = document.title; - } - }; - ws.onclose = function () { - console.log('offline'); - ws = false; - setTimeout(function () { - initWS(); - }, 2000); - }; - ws.onmessage = function (msg) { - if (msg.data == ' ') { - ws.send(' '); - } else { - try { - var jsonMsg = JSON.parse(msg.data); - console.log('data: ' + msg.data); - if (jsonMsg.service) { - return; - } - wsIncomingReply(jsonMsg); - } catch (err) { - console.log(err); - } - } - }; - setInterval(wsSendKeepAlive, 90000); -} - -function wsSendKeepAlive() { - if (ws) { - ws.send(' '); - } -} - -function wsShutdown() { - if (ws) { - ws.onclose = function () { }; - ws.close(); - } -} - -function wsIncomingReply(msg) { - let content = document.getElementById('content'); - if (!content) { return; } - let pageMID = content.getAttribute('data-mid'); - if (!pageMID || pageMID != msg.mid) { return; } - let msgNum = '/' + msg.rid; - if (msg.replyto > 0) { - msgNum += ` ${i18n('message.inReplyTo')} <a href="#${msg.replyto}">/${msg.replyto}</a>`; - } - let photoDiv = (msg.attach == null) ? '' : ` - <div class="msg-media"><a href="//i.juick.com/p/${msg.mid}-${msg.rid}.${msg.attach}"> - <img src="//i.juick.com/photos-512/${msg.mid}-${msg.rid}.${msg.attach}"/></a> - </div>`; - let msgContHtml = ` - <div class="msg-cont"> - <div class="msg-header"> - <a href="/${msg.user.uname}/">${msg.user.uname}</a>: - <div class="msg-avatar"> - <a href="/${msg.user.uname}/"><img src="//i.juick.com/a/${msg.user.uid}.png" alt="${msg.user.uname}"/></a> - </div> - <div class="msg-ts"> - <a href="/m/${msg.mid}#${msg.rid}" title="${msg.timestamp}GMT">${msg.timestamp}</a> - </div> - </div> - <div class="msg-txt">${killy.format(msg.body, msg.mid, false)}</div>${photoDiv} - <div class="msg-links">${msgNum} · <a class="msg-reply-link" href="#">${i18n('message.reply')}</a></div> - <div class="msg-comment-target msg-comment-hidden"></div> - </div>`; - - let li = document.createElement('li'); - li.setAttribute('class', 'msg reply-new'); - li.setAttribute('id', msg.rid); - li.innerHTML = msgContHtml; - li.addEventListener('click', newReply); - li.addEventListener('mouseover', newReply); - li.querySelector('a.msg-reply-link').addEventListener('click', function (e) { - showCommentForm(msg.mid, msg.rid); - e.preventDefault(); - }); - - killy.embedLinksToX(li.querySelector('.msg-cont'), '.msg-links', '.msg-txt a'); - - document.getElementById('replies').appendChild(li); - - updateRepliesCounter(); -} - -function newReply(e) { - var li = e.target; - li.classList.remove('reply-new'); - li.removeEventListener('click', e); - li.removeEventListener('mouseover', e); - updateRepliesCounter(); -} - -function nextReply() { - var li = document.querySelector('#replies>li.reply-new'); - if (li) { - li.classList.remove('reply-new'); - li.removeEventListener('click', this); - li.children[0].scrollIntoView(); - updateRepliesCounter(); - } -} - -function updateRepliesCounter() { - var replies = document.querySelectorAll('#replies>li.reply-new').length; - var wsthread = document.getElementById('wsthread'); - if (replies) { - wsthread.textContent = replies; - wsthread.style.display = 'block'; - document.title = '[' + replies + '] ' + pageTitle; - } else { - wsthread.style.display = 'none'; - document.title = pageTitle; - } -} - -/******************************************************************************/ -/******************************************************************************/ -/******************************************************************************/ - -function postformListener(formEl, ev) { - if (ev.ctrlKey && (ev.keyCode == 10 || ev.keyCode == 13)) { - let form = formEl.closest('form'); - if (!form.onsubmit || form.onsubmit()) { - form.submit(); - } - } -} -function closeDialogListener(ev) { - ev = ev || window.event; - if (ev.keyCode == 27) { - closeDialog(); - } -} - -function newMessage(evt) { - document.querySelectorAll('#newmessage .dialogtxt').forEach(t => { - t.remove(); - }); - if (document.querySelector('#newmessage textarea').value.length == 0 - && document.querySelector('#newmessage .img').value.length == 0 - && !document.querySelector('#newmessage input[type="file"]')) { - document.querySelector('#newmessage').insertAdjacentHTML('afterbegin', `<p class="dialogtxt">${i18n('postForm.pleaseInputMessageText')}</p>`); - evt.preventDefault(); - } -} - -function showCommentForm(mid, rid) { - let reply = document.getElementById(rid); - let formTarget = reply.querySelector('div.msg-cont .msg-comment-target'); - if (formTarget) { - let formHtml = ` - <form action="/comment" method="POST" enctype="multipart/form-data"> - <input type="hidden" name="mid" value="${mid}"> - <input type="hidden" name="rid" value="${rid}"> - <div class="msg-comment"> - <div class="ta-wrapper"> - <textarea name="body" rows="1" class="reply" placeholder="${i18n('comment.writeComment')}"></textarea> - <div class="attach-photo">${evilIcon('ei-camera')}</div> - </div> - <input type="submit" value="OK"> - </div> - </form>`; - formTarget.insertAdjacentHTML('afterend', formHtml); - formTarget.remove(); - - let form = reply.querySelector('form'); - let submitButton = form.querySelector('input[type="submit"]'); - - let attachButton = form.querySelector('.msg-comment .attach-photo'); - attachButton.addEventListener('click', e => attachCommentPhoto(e.target)); - - let textarea = form.querySelector('.msg-comment textarea'); - textarea.addEventListener('keypress', e => postformListener(e.target, e)); - autosize(textarea); - - let validateMessage = () => { - let len = textarea.value.length; - if (len > 4096) { return 'Message is too long'; } - return ''; - }; - form.addEventListener('submit', e => { - let validationResult = validateMessage(); - if (validationResult) { - e.preventDefault(); - alert(validationResult); - return false; - } - submitButton.disabled = true; - }); - } - reply.querySelector('.msg-comment textarea').focus(); -} - -function attachInput() { - let inp = document.createElement('input'); - inp.setAttribute('type', 'file'); - inp.setAttribute('name', 'attach'); - inp.setAttribute('accept', 'image/jpeg,image/png'); - inp.style.visibility = 'hidden'; - return inp; -} - -function attachCommentPhoto(div) { - let input = div.querySelector('input'); - if (input) { - input.remove(); - div.classList.remove('attach-photo-active'); - } else { - let newInput = attachInput(); - newInput.addEventListener('change', function () { - div.classList.add('attach-photo-active'); - }); - newInput.click(); - div.appendChild(newInput); - } -} - -function attachMessagePhoto(div) { - var f = div.closest('form'), - finput = f.querySelector('input[type="file"]'); - if (!finput) { - var inp = attachInput(); - inp.style.float = 'left'; - inp.style.width = 0; - inp.style.height = 0; - inp.addEventListener('change', function () { - div.textContent = i18n('postForm.upload') + ' (✓)'; - }); - f.appendChild(inp); - inp.click(); - } else { - finput.remove(); - div.textContent = i18n('postForm.upload'); - } -} - -function showMessageLinksDialog(mid, rid) { - let hlink = window.location.protocol + '//juick.com/' + mid; - let mlink = '#' + mid; - if (rid > 0) { - hlink += '#' + rid; - mlink += '/' + rid; - } - let hlinkenc = encodeURIComponent(hlink); - let html = ` - <div class="dialogshare"> - ${i18n('shareDialog.linkToMessage')}: <div onclick="this.selectText()" class="dialogl">${hlink}</div> - ${i18n('shareDialog.messageNumber')}: <div onclick="this.selectText()" class="dialogl">${mlink}</div> - ${i18n('shareDialog.share')}: - <ul> - <li><a href="https://www.facebook.com/sharer/sharer.php?u=${hlinkenc}" onclick="return openSocialWindow(this)">${evilIcon('ei-sc-facebook')}</a></li> - <li><a href="https://twitter.com/intent/tweet?url=${hlinkenc}" onclick="return openSocialWindow(this)">${evilIcon('ei-sc-twitter')}</a></li> - <li><a href="https://vk.com/share.php?url=${hlinkenc}" onclick="return openSocialWindow(this)">${evilIcon('ei-sc-vk')}</a></li> - </ul> - </div>`; - - openDialog(html); -} - -function showPhotoDialog(fname) { - let width = window.innerWidth; - let height = window.innerHeight; - let minDimension = (width < height) ? width : height; - if (minDimension < 640) { - return true; // no dialog, open the link - } else if (minDimension < 1280) { - openDialog(`<a href="//i.juick.com/p/${fname}"><img src="//i.juick.com/photos-1024/${fname}"/></a>`, true); - return false; - } else { - openDialog(`<a href="//i.juick.com/p/${fname}"><img src="//i.juick.com/p/${fname}"/></a>`, true); - return false; - } -} - -function openPostDialog() { - let newmessageTemplate = ` - <form id="newmessage" action="/post" method="post" enctype="multipart/form-data"> - <textarea name="body" placeholder="${i18n('postForm.newMessage')}"></textarea> - <div> - <input class="img" name="img" placeholder="${i18n('postForm.imageLink')} (${i18n('postForm.imageFormats')})"/> - ${i18n('postForm.or')} <a href="#">${i18n('postForm.upload')}</a><br/> - <input id="tags_input" class="tags" name="tags" placeholder="${i18n('postForm.tags')}"/><br/> - <input type="submit" class="subm" value="${i18n('postForm.submit')}"/> - </div> - </form> - `; - return openDialog(newmessageTemplate); -} - -function openDialog(html, image) { - var dialogHtml = ` - <div id="dialogt"> - <div id="dialogb"></div> - <div id="dialogw"> - <div id="dialog_header"> - <div id="dialogc">${evilIcon('ei-close')}</div> - </div> - ${html} - </div> - </div>`; - let body = document.querySelector('body'); - body.classList.add('dialog-opened'); - body.insertAdjacentHTML('afterbegin', dialogHtml); - if (image) { - let header = document.querySelector('#dialog_header'); - header.classList.add('header_image'); - } - document.addEventListener('keydown', closeDialogListener); - document.querySelector('#dialogb').addEventListener('click', closeDialog); - document.querySelector('#dialogc').addEventListener('click', closeDialog); -} - -function closeDialog() { - let draft = document.querySelector('#newmessage textarea'); - if (draft) { - window.draft = draft.value; - } - document.querySelector('body').classList.remove('dialog-opened'); - document.querySelector('#dialogb').remove(); - document.querySelector('#dialogt').remove(); -} - -function openSocialWindow(a) { - var w = window.open(a.href, 'juickshare', 'width=640,height=400'); - if (window.focus) { w.focus(); } - return false; -} - -function checkUsername() { - var uname = document.querySelector('#username').textContent, - style = document.querySelector('#username').style; - fetch('//api.juick.com/users?uname=' + uname) - .then(function () { - style.background = '#FFCCCC'; - }) - .catch(function () { - style.background = '#CCFFCC'; - }); -} - -/******************************************************************************/ - -function openDialogLogin() { - let html = ` - <div class="dialoglogin"> - <p>${i18n('loginDialog.pleaseIntroduceYourself')}:</p> - <a href="/_fblogin" id="signfb">${evilIcon('ei-sc-facebook')}${i18n('loginDialog.facebook')}</a> - <a href="/_vklogin" id="signvk">${evilIcon('ei-sc-vk')}${i18n('loginDialog.vk')}</a> - <p>${i18n('loginDialog.registeredAlready')}</p> - <form action="/login" method="POST"> - <input class="signinput" type="text" name="username" placeholder="${i18n('loginDialog.username')}"/><br/> - <input class="signinput" type="password" name="password" placeholder="${i18n('loginDialog.password')}"/><br/> - <input class="signsubmit" type="submit" value="OK"/> - </form> - </div>`; - openDialog(html); - return false; -} - -/******************************************************************************/ - -function resultMessage(str) { - var result = document.createElement('p'); - result.textContent = str; - return result; -} - -function likeMessage(e, mid) { - if (confirm(i18n('message.likeThisMessage?'))) { - fetch('//api.juick.com/like?mid=' + mid - + '&hash=' + document.getElementById('body').getAttribute('data-hash'), { - method: 'POST', - credentials: 'same-origin' - }) - .then(function (response) { - if (response.ok) { - e.closest('article').appendChild(resultMessage('OK!')); - } - }) - .catch(function () { - e.closest('article').appendChild(resultMessage(i18n('error.error'))); - }); - } - return false; -} - -/******************************************************************************/ - -function setPopular(e, mid, popular) { - fetch('//api.juick.com/messages/set_popular?mid=' + mid - + '&popular=' + popular - + '&hash=' + document.getElementById('body').getAttribute('data-hash'), { - credentials: 'same-origin' - }) - .then(function () { - e.closest('article').append(resultMessage('OK!')); - }); - return false; -} - -function setPrivacy(e, mid) { - fetch('//api.juick.com/messages/set_privacy?mid=' + mid - + '&hash=' + document.getElementById('body').getAttribute('data-hash'), { - credentials: 'same-origin' - }) - .then(function () { - e.closest('article').append(resultMessage('OK!')); - }); - return false; -} - -function getTags() { - fetch('//api.juick.com/tags?hash=' + document.getElementById('body').getAttribute('data-hash'), { - credentials: 'same-origin' - }) - .then(response => { - return response.json(); - }) - .then(json => { - let tags = json.map(t => t.tag); - let input = document.getElementById('tags_input'); - new Awesomplete(input, { list: tags }); - }); - return false; -} - -function addTag(tag) { - document.forms['postmsg'].body.value = '*' + tag + ' ' + document.forms['postmsg'].body.value; - return false; -} - -/******************************************************************************/ - -function ready(fn) { - if (document.readyState != 'loading') { - fn(); - } else { - document.addEventListener('DOMContentLoaded', fn); - } -} - -ready(function () { - document.querySelectorAll('textarea').forEach((ta) => { - autosize(ta); - }); - - var insertPMButtons = function (e) { - e.target.classList.add('narrowpm'); - e.target.parentNode.insertAdjacentHTML('afterend', '<input type="submit" value="OK"/>'); - e.target.removeEventListener('click', insertPMButtons); - e.preventDefault(); - }; - document.querySelectorAll('textarea.replypm').forEach(function (e) { - e.addEventListener('click', insertPMButtons); - e.addEventListener('keypress', function (e) { - postformListener(e.target, e); - }); - }); - document.querySelectorAll('#postmsg textarea').forEach(function (e) { - e.addEventListener('keypress', function (e) { - postformListener(e.target, e); - }); - }); - - var content = document.getElementById('content'); - if (content) { - var pageMID = content.getAttribute('data-mid'); - if (pageMID > 0) { - document.querySelectorAll('li.msg').forEach(li => { - let showReplyFormBtn = li.querySelector('.a-thread-comment'); - if (showReplyFormBtn) { - showReplyFormBtn.addEventListener('click', function (e) { - showCommentForm(pageMID, li.id); - e.preventDefault(); - }); - } - }); - let opMessage = document.querySelector('.msgthread'); - if (opMessage) { - let replyTextarea = opMessage.querySelector('textarea.reply'); - if (replyTextarea) { - replyTextarea.addEventListener('focus', e => showCommentForm(pageMID, 0)); - replyTextarea.addEventListener('keypress', e => postformListener(e.target, e)); - if (!window.location.hash) { - replyTextarea.focus(); - } - } - } - } - } - - var postmsg = document.getElementById('postmsg'); - if (postmsg) { - document.querySelectorAll('a').filter(t => t.href.indexOf('?') >= 0).forEach(t => { - t.addEventListener('click', e => { - let params = new URLSearchParams(t.href.slice(t.href.indexOf('?') + 1)); - if (params.has('tag')) { - addTag(params.get('tag')); - e.preventDefault(); - } - }); - }); - } - - document.querySelectorAll('.msg-menu').forEach(function (el) { - el.addEventListener('click', function (e) { - var reply = e.target.closest('li'); - var rid = reply ? parseInt(reply.id) : 0; - var message = e.target.closest('section'); - var mid = message.getAttribute('data-mid') || e.target.closest('article').getAttribute('data-mid'); - showMessageLinksDialog(mid, rid); - e.preventDefault(); - }); - }); - document.querySelectorAll('.l .a-privacy').forEach(function (e) { - e.addEventListener('click', function (e) { - setPrivacy( - e.target, - e.target.closest('article').getAttribute('data-mid')); - e.preventDefault(); - }); - }); - document.querySelectorAll('.ir a[data-fname], .msg-media a[data-fname]').forEach(function (el) { - el.addEventListener('click', function (e) { - let fname = e.target.closest('[data-fname]').getAttribute('data-fname'); - if (!showPhotoDialog(fname)) { - e.preventDefault(); - } - }); - }); - document.querySelectorAll('.social a').forEach(function (e) { - e.addEventListener('click', function (e) { - openSocialWindow(e.target); - e.preventDefault(); - }); - }); - var username = document.getElementById('username'); - if (username) { - username.addEventListener('blur', function () { - checkUsername(); - }); - } - - document.querySelectorAll('.l .a-like').forEach(function (e) { - e.addEventListener('click', function (e) { - likeMessage( - e.target, - e.target.closest('article').getAttribute('data-mid')); - e.preventDefault(); - }); - }); - document.querySelectorAll('.a-login').forEach(function (el) { - el.addEventListener('click', function (e) { - openDialogLogin(); - e.preventDefault(); - }); - }); - var unfoldall = document.getElementById('unfoldall'); - if (unfoldall) { - unfoldall.addEventListener('click', function (e) { - document.querySelectorAll('#replies>li').forEach(function (e) { - e.style.display = 'block'; - }); - document.querySelectorAll('#replies .msg-comments').forEach(function (e) { - e.style.display = 'none'; - }); - e.preventDefault(); - }); - } - document.querySelectorAll('article').forEach(function (article) { - if (Array.prototype.some.call( - article.querySelectorAll('.msg-tags a'), - function (a) { - return a.textContent === 'NSFW'; - } - )) { - article.classList.add('nsfw'); - } - }); - initWS(); - - window.addEventListener('pagehide', wsShutdown); - - killy.embedAll(); - var elSelector = 'header', - elClassHidden = 'header--hidden', - elClassBackground = 'header--background', - throttleTimeout = 500, - element = document.querySelector(elSelector); - - if (element) { - - var dHeight = 0, - wHeight = 0, - wScrollCurrent = 0, - wScrollBefore = 0, - wScrollDiff = 0, - - throttle = function (delay, fn) { - var last, deferTimer; - return function () { - var context = this, args = arguments, now = +new Date; - if (last && now < last + delay) { - clearTimeout(deferTimer); - deferTimer = setTimeout( - function () { - last = now; - fn.apply(context, args); - }, - delay); - } else { - last = now; - fn.apply(context, args); - } - }; - }; - - window.addEventListener('scroll', throttle(throttleTimeout, function () { - dHeight = document.body.offsetHeight; - wHeight = window.innerHeight; - wScrollCurrent = window.pageYOffset; - wScrollDiff = wScrollBefore - wScrollCurrent; - - if (wScrollCurrent <= 0) { - // scrolled to the very top; element sticks to the top - element.classList.remove(elClassHidden); - element.classList.remove(elClassBackground); - } else if (wScrollDiff > 0 && element.classList.contains(elClassHidden)) { - // scrolled up; element slides in - element.classList.remove(elClassHidden); - element.classList.add(elClassBackground); - } else if (wScrollDiff < 0) { - // scrolled down - if (wScrollCurrent + wHeight >= dHeight && element.classList.contains(elClassHidden)) { - // scrolled to the very bottom; element slides in - element.classList.remove(elClassHidden); - element.classList.add(elClassBackground); - } else { - // scrolled down; element slides out - element.classList.add(elClassHidden); - } - } - - wScrollBefore = wScrollCurrent; - })); - } -}); |