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Advanced Svelte Reusing content Passing snippets to components

Since snippets — like functions — are just values, they can be passed to components as props.

Take this <FilteredList> component. Its job is to filter the data that gets passed into it, but it has no opinions about how that data should be rendered — that’s the responsibility of the parent component.

We’ve already got some snippets defined. Begin by passing them into the <FilteredList>:

App
<FilteredList
	data={colors}
	field="name"
	{header}
	{row}
></FilteredList>

Then, on the other side, declare header and row as props:

FilteredList
<script>
	let { data, field, header, row } = $props();

	// ...
</script>

Finally, replace the placeholder content with render tags:

FilteredList
<div class="header">
	{@render header()}
</div>

<div class="content">
	{#each filtered as d}
		{@render row(d)}
	{/each}
</div>

Never again will you have to memorize the hex code for MistyRose or PeachPuff.

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Snippets and render tags
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<script>
	import FilteredList from './FilteredList.svelte';
	import { colors } from './data.js';
</script>
 
<FilteredList
	data={colors}
	field="name"
></FilteredList>
 
{#snippet header()}
	<header>
		<span class="color"></span>
		<span class="name">name</span>
		<span class="hex">hex</span>
		<span class="rgb">rgb</span>
		<span class="hsl">hsl</span>
	</header>
{/snippet}
 
{#snippet row(d)}
	<div class="row">
		<span class="color" style="background-color: {d.hex}"></span>
		<span class="name">{d.name}</span>
		<span class="hex">{d.hex}</span>
		<span class="rgb">{d.rgb}</span>
		<span class="hsl">{d.hsl}</span>
	</div>
{/snippet}
 
<style>
	header, .row {
		display: grid;
		align-items: center;
		grid-template-columns: 2em 4fr 3fr;
		gap: 1em;
		padding: 0.1em;
		background: var(--bg-1);
		border-radius: 0.2em;
	}
 
	header {
		font-weight: bold;
	}
 
	.row:hover {
		background: var(--bg-2);
	}
 
	.color {
		aspect-ratio: 1;
		height: 100%;
		border-radius: 0.1em;
	}
 
	.rgb, .hsl {
		display: none;
	}
 
	@media (min-width: 40rem) {
		header, .row {
			grid-template-columns: 2em 4fr 3fr 3fr;
		}
 
		.rgb {
			display: block;
		}
	}
 
	@media (min-width: 60rem) {
		header, .row {
			grid-template-columns: 2em 4fr 3fr 3fr 3fr;
		}
 
		.hsl {
			display: block;
		}
	}
</style>