Components can pass data back to their slotted content via slot props. In this app, we have a list of named CSS colours. Typing into the <input>
will filter the list.
Right now every row is showing AliceBlue
, and as lovely a colour as it is, that's not what we want.
Open FilterableList.svelte
. The <slot>
is being rendered for each filtered item in the list. Pass the data into the slot:
FilterableList.svelte
<div class="content">
{#each data.filter(matches) as item}
<slot {item}></slot>
{/each}
</div>
(As in other contexts, {item}
is shorthand for item={item}
.)
Then, on the other side, expose the data to the slotted content with the let:
directive:
App.svelte
<FilterableList
data={colors}
field="name"
let:item={row}
>
<div class="row">
<span class="color" style="background-color: {row.hex}" />
<span class="name">{row.name}</span>
<span class="hex">{row.hex}</span>
<span class="rgb">{row.rgb}</span>
<span class="hsl">{row.hsl}</span>
</div>
</FilterableList>
Finally, get rid of the placeholder variable, which we no longer need:
App.svelte
<script>
import FilterableList from './FilterableList.svelte';
import { colors } from './colors.js';
let row = colors[0];
</script>
Named slots can also have props; use the
let
directive on an element with aslot="..."
attribute, instead of on the component itself.
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<script>
import FilterableList from './FilterableList.svelte';
import { colors } from './colors.js';
let row = colors[0];
</script>
<FilterableList
data={colors}
field="name"
>
<header slot="header" class="row">
<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>
<div class="row">
<span class="color" style="background-color: {row.hex}"></span>
<span class="name">{row.name}</span>
<span class="hex">{row.hex}</span>
<span class="rgb">{row.rgb}</span>
<span class="hsl">{row.hsl}</span>
</div>
</FilterableList>
<style>
.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:not(header):hover {
background: var(--bg-2);
}
.color {
aspect-ratio: 1;
height: 100%;
border-radius: 0.1em;
}
.rgb, .hsl {
display: none;
}
@media (min-width: 40rem) {
.row {
grid-template-columns: 2em 4fr 3fr 3fr;
}
.rgb {
display: block;
}
}
@media (min-width: 60rem) {
.row {
grid-template-columns: 2em 4fr 3fr 3fr 3fr;
}
.hsl {
display: block;
}
}
</style>