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example.html
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example.html
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<!doctype html>
<link rel="stylesheet" href="example.css">
<todo-app></todo-app>
<script type="module">
import html from './yhtml.js'
const store = {
filter: 'all',
items: Array(10).fill(0).map(i =>
({ title: Math.random().toString(36).slice(2), done: 0 })
),
setFilter(v) {
this.filter = v;
window.dispatchEvent(new Event('state-change'))
},
setItem(i, data) {
Object.assign(this.items[i], data);
window.dispatchEvent(new Event('state-change'))
},
removeItem(i) {
this.items.splice(i, 1)
window.dispatchEvent(new Event('state-change'))
},
getFilteredItems() {
return this.items.filter(i => {
if (this.filter == 'all') return true
if (this.filter == 'completed' && i.done) return true
if (this.filter == 'active' && !i.done) return true
})
},
clearCompleted() {
this.items = this.items.filter(i => !i.done)
window.dispatchEvent(new Event('state-change'))
},
addItem(title) {
store.items.unshift({ title, done: false })
window.dispatchEvent(new Event('state-change'))
}
}
class TodoApp extends HTMLElement {
connectedCallback() {
this.render()
window.addEventListener('state-change', _ => this.render())
}
get $input() {
return this.querySelector('[ref="input"]')
}
addItem(e) {
e.preventDefault()
store.addItem(this.$input.value)
this.$input.focus()
}
render() {
this.innerHTML = html`
<card>
<h1>todos</h1>
<form class="add-item" @submit="addItem">
<input ref="input" name="title" type="text" placeholder="What needs doing?">
</form>
<todo-list></todo-list>
</card>
<footer class="muted">
Double-click to edit a todo
</footer>
`
}
}
class TodoList extends HTMLElement {
connectedCallback() {
this.render()
}
setFilter(e) {
store.setFilter(e.target.dataset.filter)
}
clearCompleted() {
store.clearCompleted();
}
render() {
const items = store.getFilteredItems()
this.innerHTML = html`
<div class="items">
${items.map(i => html`
<todo-item data-index="${store.items.findIndex(item => i == item)}"></todo-item>
`)}
</div>
${store.items.length > 0 && html`
<footer class="flex">
<span>${items.length} items</span>
<span>
${['all', 'active', 'completed'].map(label => html`
<button
class="${store.filter == label && 'selected'}"
@click="setFilter"
data-filter="${label}"
>
${label}
</button>
`)}
</span>
<button class="flat" @click="clearCompleted">Clear completed</button>
</footer>
`}
`
}
}
class TodoItem extends HTMLElement {
connectedCallback() {
this.index = this.getAttribute('data-index')
this.item = store.items[this.index]
this.editing = false
this.render()
}
get $input() {
return this.querySelector('[ref="input"]')
}
edit(e) {
e.preventDefault()
this.editing = true
this.render()
this.querySelector('input[type="text"]').focus()
}
save(e) {
this.editing = false
store.setItem(this.index, { title: this.$input.value })
this.render()
}
remove(e) {
store.removeItem(this.index)
}
done(e) {
store.setItem(this.index, { done: e.target.checked })
}
render() {
this.innerHTML = html`
<input type="checkbox" @click="done" ${this.item.done && 'checked'}>
${this.editing ? html`
<form @submit="save" class="title">
<input ref="input" type="text" @focusout="save" value="${this.item.title}">
</form>
` : html`
<span class="title" @dblclick="edit">${this.item.title}</span>
`}
<button @click="remove">×</button>
`
}
}
customElements.define('todo-app', TodoApp)
customElements.define('todo-list', TodoList)
customElements.define('todo-item', TodoItem)
</script>