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svelte/site/content/examples/06-lifecycle/02-update/App.svelte

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<script>
import Eliza from 'elizanode';
import { beforeUpdate, afterUpdate } from 'svelte';
let div;
let autoscroll;
beforeUpdate(() => {
autoscroll = div && (div.offsetHeight + div.scrollTop) > (div.scrollHeight - 20);
});
afterUpdate(() => {
if (autoscroll) div.scrollTo(0, div.scrollHeight);
});
const eliza = new Eliza();
let comments = [
{ author: 'eliza', text: eliza.getInitial() }
];
function handleKeydown(event) {
if (event.which === 13) {
const text = event.target.value;
if (!text) return;
comments = comments.concat({
author: 'user',
text
});
event.target.value = '';
const reply = eliza.transform(text);
setTimeout(() => {
comments = comments.concat({
author: 'eliza',
text: '...',
placeholder: true
});
setTimeout(() => {
comments = comments.filter(comment => !comment.placeholder).concat({
author: 'eliza',
text: reply
});
}, 500 + Math.random() * 500);
}, 200 + Math.random() * 200);
}
}
</script>
<style>
.chat {
display: flex;
flex-direction: column;
height: 100%;
max-width: 320px;
}
.scrollable {
flex: 1 1 auto;
border-top: 1px solid #eee;
margin: 0 0 0.5em 0;
overflow-y: auto;
}
article {
margin: 0.5em 0;
}
.user {
text-align: right;
}
span {
padding: 0.5em 1em;
display: inline-block;
}
.eliza span {
background-color: #eee;
border-radius: 1em 1em 1em 0;
}
.user span {
background-color: #0074D9;
color: white;
border-radius: 1em 1em 0 1em;
}
</style>
<div class="chat">
<h1>Eliza</h1>
<div class="scrollable" bind:this={div}>
{#each comments as comment}
<article class={comment.author}>
<span>{comment.text}</span>
</article>
{/each}
</div>
<input on:keydown={handleKeydown}>
</div>