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svelte-overflow-fade

GitHub

@attach overflowFade (Attachment)

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isOverflowing (Overflow Detection Only)

Use this to detect container overflow and show/hide scroll controls. Note: The overflowFade action also emits these same events while adding visual fades.

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Example Code

<script>
  import { isOverflowingAction } from 'svelte-overflow-fade';
  
  let showLeftBtn = $state(false);
  let showRightBtn = $state(false);
</script>

<div 
  class="relative"
>
  <div
    class="overflow-auto"
    use:isOverflowingAction={{ 
      axis: 'x' 
    }}
    onoverflow={({ detail }) => {
      showLeftBtn = detail.overflowLeft;
      showRightBtn = detail.overflowRight;
    }}
  >
    <!-- Scrollable content -->
  </div>
  
  {#if showLeftBtn}
    <button class="absolute left-4">←</button>
  {/if}
  
  {#if showRightBtn}
    <button class="absolute right-4">→</button>
  {/if}
</div>

Installation & Usage

Install

npm install svelte-overflow-fade
pnpm add svelte-overflow-fade
yarn add svelte-overflow-fade

Action API

Compatible with all Svelte versions

<script>
  import { overflowFadeAction } from 'svelte-overflow-fade';
</script>

<div 
  class="overflow-auto max-h-64"
  use:overflowFadeAction={{
    axis: 'y',
    fade: { 
      type: 'mask', 
      fadePercent: 10 
    }
  }}
  onoverflow={({ detail }) => {
    // Also emits overflow events!
    console.log(detail.overflowTop, detail.overflowBottom);
  }}
>
  <!-- Scrollable content -->
</div>

Attachment API

Svelte 5.29+ with enhanced reactivity

<script>
  import { overflowFade } from 'svelte-overflow-fade';
</script>

<div 
  class="overflow-auto max-h-64"
  {@attach overflowFade({
    axis: 'y',
    fade: { 
      type: 'mask', 
      fadePercent: 10 
    }
  })}
>
  <!-- Scrollable content -->
</div>

Configuration Options

axis: 'x' | 'y' | 'both' - Scroll direction ('both' fades all four edges)
sides: 'both' | 'start' | 'end' - Which edge to fade (default 'both')
fade.type: 'mask' | 'element' - Fade implementation
fade.fadePercent: number - Fade size (mask mode)
fade.size: string - Fade size (element mode)
fade.backgroundColor: string - Fade color (element mode)