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chatbox.html
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<!--
Copyright 2017
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Author: Eric Bidelman (@ebidel)
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Disable scroll chaining on fixed position element</title>
<style>
* {
box-sizing: border-box;
}
html {
--header-height: 60px;
}
html, body {
font-family: "Open Sans", sans-serif;
font-weight: 300;
font-size: 16px;
background: #fafafa;
margin: 0;
overscroll-behavior-y: contain; /* disable pull to refresh, keeps glow effects */
}
h1, h2, h3 {
margin: 0;
font-weight: inherit;
}
header {
padding: 0 8px;
background: #f44336;
color: #fff;
position: fixed;
top: 0;
left: 0;
right: 0;
z-index: 2;
height: var(--header-height);
display: flex;
align-items: center;
justify-content: space-between;
}
#inbox {
padding-top: var(--header-height); /* height of header */
}
chat-window {
position: fixed;
bottom: 0;
right: 16px;
}
section {
counter-reset: email;
}
section div {
margin: 0;
padding: 16px 8px;
border-top: 1px solid #ccc;
display: flex;
justify-content: space-between;
}
section .label::after {
counter-increment: email;
content: counter(email);
margin-left: 8px;
}
body.refreshing #inbox,
body.refreshing header {
filter: blur(1px);
touch-action: none; /* prevent scrolling */
}
body.refreshing .refresher {
transform: translate3d(0,150%,0) scale(1);
z-index: 1;
visibility: visible;
}
.refresher {
pointer-events: none;
--refresh-width: 55px;
background: #fff;
width: var(--refresh-width);
height: var(--refresh-width);
border-radius: 50%;
position: absolute;
left: calc(50% - var(--refresh-width) / 2);
padding: 8px;
box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.14),
0 1px 5px 0 rgba(0, 0, 0, 0.12),
0 3px 1px -2px rgba(0, 0, 0, 0.2);
transition: all 300ms cubic-bezier(0,0,0.2,1);
will-change: transform, opacity;
display: inline-flex;
justify-content: space-evenly;
align-items: center;
visibility: hidden;
}
body.refreshing .refresher.shrink {
transform: translate3d(0,150%,0) scale(0);
opacity: 0;
}
.refresher.done {
transition: none;
}
.loading-bar {
width: 4px;
height: 18px;
border-radius: 4px;
animation: loading 1s ease-in-out infinite;
}
.loading-bar:nth-child(1) {
background-color: #3498db;
animation-delay: 0;
}
.loading-bar:nth-child(2) {
background-color: #c0392b;
animation-delay: 0.09s;
}
.loading-bar:nth-child(3) {
background-color: #f1c40f;
animation-delay: .18s;
}
.loading-bar:nth-child(4) {
background-color: #27ae60;
animation-delay: .27s;
}
@keyframes loading {
0% {
transform: scale(1);
}
20% {
transform: scale(1,2.2);
}
40% {
transform: scale(1);
}
}
</style>
</head>
<body>
<main>
<header>
<div>
<h2>Your inbox...</h2>
</div>
</header>
<div class="refresher">
<div class="loading-bar"></div>
<div class="loading-bar"></div>
<div class="loading-bar"></div>
<div class="loading-bar"></div>
</div>
<section id="inbox">
<!-- filled dynamically -->
</section>
<chat-window title="Chat with Eric Bidelman" open>
<div class="msg">I'm going to count...</div>
<div class="msg">1</div>
<div class="msg">2</div>
<div class="msg">3</div>
<div class="msg">4</div>
<div class="msg">5</div>
<div class="msg">6</div>
<div class="msg">Scrolling in this window does not scroll the page behind it!</div>
<div class="msg">The .msgs container has <code>overflow:auto</code> and uses <code>overscroll-behavior-y:contain</code> to prevent that behavior.</div>
</chat-window>
</main>
<template id="chat-window-template">
<style>
:host {
display: block;
max-width: 250px;
background: #fff;
contain: content;
}
:host([open]) .msgs {
display: flex;
}
.toolbar {
padding: 8px;
background: #404040;
color: #fff;
display: flex;
justify-content: space-between;
align-items: center;
border-top-left-radius: 3px;
border-top-right-radius: 3px;
cursor: pointer;
user-select: none;
}
.toolbar #title {
text-overflow: ellipsis;
white-space: nowrap;
overflow: hidden;
}
.toolbar #close {
font-size: inherit;
background: none;
border: none;
color: inherit;
}
.msgs {
border-left: 1px solid #ccc;
border-right: 1px solid #ccc;
display: flex;
flex-direction: column;
align-items: start;
height: 300px;
overflow: auto;
overscroll-behavior-y: contain;
}
::slotted(.msg) {
padding: 8px 16px;
margin: 8px;
border-radius: 5px;
background-color: #eee;
}
::slotted(.msg:nth-child(even)) {
align-self: flex-end;
}
#input-container {
border: 1px solid #ccc;
border-top: 1px solid #aaa;
}
#input-container input {
padding: 8px;
font-size: inherit;
width: 100%;
height: 100%;
border: none;
box-sizing: border-box;
}
.msgs-container {
display: none;
}
:host([open]) .msgs-container {
display: block;
}
</style>
<div class="toolbar">
<span id="title"></span>
<button id="close">𝘅</button>
</div>
<div class="msgs-container">
<div class="msgs">
<slot></slot>
</div>
<div id="input-container">
<input type="text" placeholder="Enter text">
</div>
</div>
</template>
<script>
(() => {
if (!CSS.supports('overscroll-behavior-y', 'contain')) {
alert("Your browser doesn't support overscroll-behavior :(");
}
// Define <chat-window> custom element.
customElements.define('chat-window', class extends HTMLElement {
constructor() {
super();
const shadowRoot = this.attachShadow({mode: 'open'});
const tmpl = document.querySelector('#chat-window-template');
shadowRoot.appendChild(tmpl.content.cloneNode(true));
shadowRoot.querySelector('#title').textContent = this.title;
const closeButton = shadowRoot.querySelector('#close');
closeButton.addEventListener('click', e => {
this.remove();
});
this.msgs = shadowRoot.querySelector('.msgs');
this.input = shadowRoot.querySelector('input');
this.input.addEventListener('keypress', e => {
if (e.code === 'Enter' && this.input.value) {
const msg = document.createElement('div');
msg.classList.add('msg');
msg.textContent = this.input.value;
this.appendChild(msg);
e.target.value = null;
this._scrollToBottom();
}
});
const toolbar = shadowRoot.querySelector('.toolbar');
toolbar.addEventListener('click', e => {
this.open = !this.open;
if (this.open) {
this.input.focus();
} else {
this.input.blur();
this.blur();
}
});
this.tabIndex = 0;
this.open = this.hasAttribute('open');
}
get open() {
return this._open;
}
set open(val) {
this._open = val;
if (this._open) {
this.setAttribute('open', '');
this._scrollToBottom();
} else {
this.removeAttribute('open');
}
}
_scrollToBottom() {
this.msgs.scrollTop = this.msgs.scrollHeight;
}
});
async function simulateRefreshAction() {
const sleep = (timeout) => new Promise(resolve => setTimeout(resolve, timeout));
const transitionEnd = function(propertyName, node) {
return new Promise(resolve => {
function callback(e) {
e.stopPropagation();
if (e.propertyName === propertyName) {
node.removeEventListener('transitionend', callback);
resolve(e);
}
}
node.addEventListener('transitionend', callback);
});
}
const refresher = document.querySelector('.refresher');
document.body.classList.add('refreshing');
await sleep(2000);
refresher.classList.add('shrink');
await transitionEnd('transform', refresher);
refresher.classList.add('done');
refresher.classList.remove('shrink');
document.body.classList.remove('refreshing');
await sleep(0); // let new styles settle.
refresher.classList.remove('done');
}
function getRandomIntInclusive(min, max) {
min = Math.ceil(min);
max = Math.floor(max);
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function formatDateBasedOnToday(date) {
const today = new Date();
const opts = {};
if (date.getDay() === today.getDay()) {
opts.minute = 'numeric';
opts.hour = 'numeric';
} else {
opts.month = 'short';
opts.day = 'numeric';
}
return new Intl.DateTimeFormat('en-US', opts).format(date);
}
function populatePage(inbox) {
const frag = new DocumentFragment();
let date = new Date();
for (let i = 0; i < NUM_EMAILs; ++i) {
date.setMinutes(date.getMinutes() - getRandomIntInclusive(1, 10));
const div = document.createElement('div');
div.innerHTML = `<span class="label">Email</span></span>${formatDateBasedOnToday(date)}</span>`;
frag.appendChild(div);
}
inbox.appendChild(frag);
}
const NUM_EMAILs = 100;
let _startY = 0;
const inbox = document.querySelector('#inbox');
inbox.addEventListener('touchstart', e => {
_startY = e.touches[0].pageY;
}, {passive: true});
inbox.addEventListener('touchmove', e => {
const y = e.touches[0].pageY;
// Activate custom pull-to-refresh effects when at the top fo the container
// and user is scrolling up.
if (document.scrollingElement.scrollTop === 0 && y > _startY &&
!document.body.classList.contains('refreshing')) {
simulateRefreshAction();
}
}, {passive: true});
populatePage(inbox);
})();
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-43475701-1', 'ebidel.github.io');
ga('send', 'pageview');
</script>
</body>
</html>