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svelte: Port Placeholder component from Ember.js app #12562

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32 changes: 32 additions & 0 deletions svelte/src/lib/components/Placeholder.stories.svelte
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Original file line number Diff line number Diff line change
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<script module>
import { defineMeta } from '@storybook/addon-svelte-csf';

import Placeholder from './Placeholder.svelte';

const { Story } = defineMeta({
title: 'Placeholder',
component: Placeholder,
tags: ['autodocs'],
});
</script>

<Story name="Default" args={{ style: 'width: 200px; height: 20px; border-radius: 4px;' }} />

<Story name="Multiple Lines" asChild>
<div style="display: flex; flex-direction: column; gap: 8px;">
<Placeholder style="width: 100%; height: 20px; border-radius: 4px;" />
<Placeholder style="width: 80%; height: 20px; border-radius: 4px;" />
<Placeholder style="width: 90%; height: 20px; border-radius: 4px;" />
Comment on lines +17 to +19
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@eth3lbert eth3lbert Dec 21, 2025

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Based on the example shown, if this scenario is common, I'd prefer providing props or CSS variables over an inline style approach.

</div>
</Story>

<Story name="Card" asChild>
<div style="display: flex; gap: 16px; align-items: flex-start;">
<Placeholder style="width: 80px; height: 80px; border-radius: 8px; flex-shrink: 0;" />
<div style="display: flex; flex-direction: column; gap: 8px; flex: 1;">
<Placeholder style="width: 60%; height: 24px; border-radius: 4px;" />
<Placeholder style="width: 100%; height: 16px; border-radius: 4px;" />
<Placeholder style="width: 40%; height: 16px; border-radius: 4px;" />
</div>
</div>
</Story>
37 changes: 37 additions & 0 deletions svelte/src/lib/components/Placeholder.svelte
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<script lang="ts">
import type { HTMLAttributes } from 'svelte/elements';

let { class: className, ...restProps }: HTMLAttributes<HTMLDivElement> = $props();
</script>

<div class="placeholder {className}" {...restProps}></div>

<style>
.placeholder {
position: relative;
display: block;
overflow: hidden;
background: linear-gradient(
to right,
var(--placeholder-bg) 8%,
var(--placeholder-bg2) 16%,
var(--placeholder-bg) 29%
);
background-size: 1200px 100%;
animation-name: backgroundAnimation;
animation-duration: 1.5s;
animation-timing-function: linear;
animation-iteration-count: infinite;
animation-fill-mode: forwards;
}

@keyframes backgroundAnimation {
0% {
background-position: -500px;
}

100% {
background-position: 500px;
}
}
</style>