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svelte/documentation/tutorial/07-lifecycle/03-update/app-b/App.svelte

114 lines
1.9 KiB

<script>
import Eliza from 'elizabot';
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.key === 'Enter') {
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>
<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>
<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;
word-break: break-all;
}
</style>