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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Todos</title>
<style>
html {
font: 300 14px "Helvetica Neue", Helvetica, Arial, sans-serif;
background: #f5f5f5;
}
h1 {
text-align: center;
font-weight: 200;
font-size: 80px;
margin: 1rem 0;
color: highlight;
}
footer {
margin-top: 3em;
font-size: smaller;
text-align: center;
color: grayText;
}
footer a:any-link {
color: inherit;
font-weight: 400;
text-decoration: none;
}
footer a:hover {
text-decoration: underline;
}
main {
max-width: 550px;
margin: auto;
background: #fff;
box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), 0 25px 50px 0 rgba(0, 0, 0, 0.1);
}
main input[type="text"] {
box-sizing: border-box;
width: 100%;
border: 0;
font: inherit;
font-size: 24px;
padding: 15px;
margin-inline-start: -44px;
padding-inline-start: 52px;
box-shadow: inset 0 -2px 1px rgba(0, 0, 0, .03);
}
main input[type="text"]::placeholder {
font-style: italic;
color: grayText;
}
todo-item {
border-top: 1px solid #eee;
}
todo-item:first-child {
border-color: #ddd;
}
#footer {
display: flex;
justify-content: space-between;
align-items: center;
border-top: 1px solid #eee;
padding: .5em 1em;
box-shadow: 0 1px 1px #0003,
0 8px 0 -3px #f6f6f6,
0 9px 1px -3px #0003,
0 16px 0 -6px #f6f6f6,
0 17px 2px -6px #0003;
}
#footer[hidden] {
display: none;
}
#clear-button {
background: none;
color: inherit;
padding: 0;
border: 0;
font: inherit;
cursor: pointer;
}
#clear-button:hover {
text-decoration: underline;
}
#filters input {
position: absolute;
clip-path: inset(50%);
}
#filters {
display: flex;
gap: .5em;
}
#filters a {
padding: .25em .5em;
border-radius: 3px;
border: 1px solid transparent;
color: inherit;
text-decoration: none;
}
#filters [aria-current="true"] {
border-color: highlight;
}
#toggle-all {
display: flex;
justify-content: center;
align-items: center;
width: 44px;
order: -1;
z-index: 1;
cursor: default
}
#toggle-all[hidden] {
visibility: hidden;
}
#toggle-all[aria-checked="false"] > * {
opacity: .25;
}
#todos[data-filter="active"] [completed] {
display: none;
}
#todos[data-filter="completed"] :not([completed]) {
display: none;
}
</style>
<h1>todos</h1>
<main>
<form style="display: flex">
<input type="text" placeholder="What needs to be done?" autofocus>
<div id="toggle-all" role="checkbox" aria-checked="false" tabindex="0" title="Mark all as complete" hidden><div aria-hidden="true" style="font-size: 22px; transform: rotate(90deg)">❯</div></div>
</form>
<div id="todos" role="list"></div>
<form id="footer" hidden>
<div style="flex: 1 1 0" id="count"></div>
<div id="filters">
<a aria-current="true" href="#/all">All</a>
<a href="#/active">Active</a>
<a href="#/completed">Completed</a>
</div>
<div style="flex: 1 1 0; text-align: end">
<button id="clear-button" type="button">Clear completed</button>
</div>
</form>
</main>
<footer>
<p>Double-click to edit a todo
<p>Created by <a href="https://github.com/johnfactotum">John Factotum</a>
<p>After <a href="http://todomvc.com/">TodoMVC</a>
</footer>
<template id="todo-item-template">
<style>
:host {
display: flex;
font-size: 24px;
align-items: center;
}
:host > * {
padding: 15px;
}
:host([hidden]) {
display: none;
}
:host([completed]) span {
opacity: .4;
text-decoration: line-through;
}
input, button {
background: none;
color: inherit;
padding: 0;
border: 0;
font: inherit;
}
button {
display: none;
}
:host(:hover) button {
display: block;
}
:host([editing]) button {
display: none;
}
span, #input {
flex: 1;
}
:host([editing]) span {
display: none;
}
:host(:not([editing])) #input {
display: none;
}
#checkbox {
font-weight: 600;
color: transparent;
display: flex;
justify-content: center;
align-items: center;
padding: 0;
}
:host([completed]) svg circle {
stroke: highlight;
}
:host([completed]) svg path {
fill: highlight;
}
:host([editing]) #checkbox {
visibility: hidden;
}
</style>
<div id="checkbox" role="checkbox" tabindex="0" aria-checked="false" aria-labelledby="span">
<svg aria-hidden="true" width="40" height="40" viewBox="-10 -18 100 135">
<circle cx="50" cy="50" r="50" fill="none" stroke="#ccc" stroke-width="3"/>
<path d="M72 25L42 71 27 56l-4 4 20 20 34-52z" fill="none"/>
</svg>
</div>
<span id="span"></span>
<input type="text" id="input"></input>
<button title="Delete">×</button>
</template>
<script>
customElements.define('todo-item', class extends HTMLElement {
static observedAttributes = ['editing', 'completed', 'description']
#root = this.attachShadow({ mode: 'closed' })
constructor() {
super()
this.attachInternals().role = 'listitem'
const template = document.querySelector('#todo-item-template')
this.#root.append(template.content.cloneNode(true))
this.#root.querySelector('#checkbox').addEventListener('keydown', e =>
e.key === ' ' ? (e.preventDefault(), e.target.click()) : null)
this.#root.querySelector('#checkbox').addEventListener('click', () => {
if (this.hasAttribute('completed')) this.removeAttribute('completed')
else this.setAttribute('completed', '')
})
this.#root.querySelector('button').addEventListener('click', () =>
this.remove())
this.#root.querySelector('span').addEventListener('dblclick', () => {
this.setAttribute('editing', '')
this.#root.querySelector('#input').focus()
})
this.#root.querySelector('#input').addEventListener('keydown', e => {
if (e.key === 'Enter') e.target.blur()
else if (e.key === 'Escape') this.removeAttribute('editing')
})
this.addEventListener('blur', () => {
if (this.hasAttribute('editing')) {
const value = this.#root.querySelector('#input').value.trim()
if (value) {
this.setAttribute('description', value)
this.removeAttribute('editing')
} else this.remove()
}
})
}
attributeChangedCallback(name, _, val) {
switch (name) {
case 'completed':
this.#root.querySelector('#checkbox').ariaChecked =
val != null ? 'true' : 'false'
break
case 'description':
this.#root.querySelector('span').textContent = val
break
case 'editing':
this.#root.querySelector('#input').value =
this.getAttribute('description')
break
}
}
})
const todos = document.querySelector('#todos')
document.querySelector('form').addEventListener('submit', e => {
e.preventDefault()
const value = e.target.querySelector('input').value.trim()
if (!value) return
const item = document.createElement('todo-item')
item.setAttribute('description', value)
todos.append(item)
e.target.reset()
})
document.querySelector('#toggle-all').addEventListener('click', e => {
const checked = e.currentTarget.ariaChecked === 'true'
if (checked) for (const item of todos.children) item.removeAttribute('completed')
else for (const item of todos.children) item.setAttribute('completed', '')
e.currentTarget.ariaChecked = !checked
})
document.querySelector('#clear-button').addEventListener('click', () => {
for (const item of todos.querySelectorAll('[completed]')) item.remove()
})
const load = () => todos.innerHTML = localStorage.getItem('todos')
const updateAndSave = () => {
const total = todos.children.length
const completed = todos.querySelectorAll('[completed]').length
const active = total - completed
document.querySelector('#count').textContent =
`${active} ${active === 1 ? 'item' : 'items'} left`
document.querySelector('#clear-button').hidden = completed === 0
document.querySelector('#footer').hidden = total === 0
document.querySelector('#toggle-all').hidden = total === 0
document.querySelector('#toggle-all').ariaChecked = completed === total
localStorage.setItem('todos', todos.innerHTML)
}
const itemObserver = new MutationObserver(updateAndSave)
new MutationObserver(mutations => {
for (const mutation of mutations)
for (const node of mutation.addedNodes) itemObserver.observe(node, {
attributes: true,
attributefilter: ['completed', 'description'],
})
updateAndSave()
}).observe(todos, { childList: true })
const updateFilter = () => {
const hash = location.hash || '#/all'
todos.dataset.filter = hash.replace('#/', '')
for (const a of document.querySelectorAll('#filters a'))
a.ariaCurrent = a.getAttribute('href') === hash ? 'true' : null
}
addEventListener('hashchange', updateFilter)
updateFilter()
addEventListener('storage', load)
load()
</script>