Agent skill

webflow-interactivity-systems

Use observer, scroll tracking, and subscription services for advanced interactivity. Use when implementing scroll animations, viewport detection, or frame-based updates.

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/webflow-interactivity-systems

SKILL.md

Webflow Interactivity Systems

This skill guides you through the specialized systems for viewport detection, scroll progress tracking, and global event subscriptions.

Viewport & Scroll Tracking

Import from @/modules/_:

onView (Viewport Detection)

Triggers a callback when an element enters or leaves the viewport.

typescript
onView(element, {
  threshold: 0.1,
  callback: ({ isIn, direction }) => {
    element.classList.toggle("is-visible", isIn);
  }
});

onTrack (Scroll Progress)

Maps scroll progress through an element to a range of values.

typescript
onTrack(element, {
  bounds: [0, 100], // Map progress to 0-100
  top: "bottom",    // Start when bottom of element hits viewport top
  bottom: "top",    // End when top of element hits viewport bottom
  callback: (value) => {
    element.style.setProperty("--progress", value.toString());
  }
});

Global Subscriptions

Import from @lib/subs:

Raf (Animation Frame)

For smooth, frame-based updates. Returns an unsubscribe function.

typescript
const unsubscribe = Raf.add(({ deltaTime, time }) => {
  element.style.transform = `rotate(${time * 50}deg)`;
});
onDestroy(unsubscribe);

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