Anchor Scroll-Spy Nav

In-page section links that highlight themselves as the reader scrolls, so a long docs or landing page always shows where you are without you having to hunt for it. Tracks visibility with IntersectionObserver, never a scroll handler, so it costs nothing on long pages.

Standard Navigation · React · Subscription · commercial licence · v1.0.1 · updated 2026-10-15 · Live demo

Install

velocityx add standard-anchor-scroll-spy-nav

Subscription component. Run velocityx login with your key first — get one.

---
import AnchorScrollSpyNav from '../components/velocity/standard-anchor-scroll-spy-nav/AnchorScrollSpyNav.jsx';
---
<AnchorScrollSpyNav client:visible />

Props

Prop	Type	Default	Description
`sections`	`array`	`[]`	—
`rootMargin`	`string`	`'-15% 0px -70% 0px'`	—
`label`	`string`	`'On this page'`	—
`title`	—	—	—
`className`	`string`	`''`	—

Files written

velocityx drops these into your project:

components/velocity/standard-anchor-scroll-spy-nav/AnchorScrollSpyNav.jsx

Peer dependencies

react — nothing else. Zero external dependencies is the point.

Theming

Colours come from the primary-* / accent-* Tailwind scales, so this drops into a project that is not Velocity without dragging our brand in. Install the contract once:

velocityx theme

Then set your whole brand in one place — raw RGB channels, not hex (a hex here silently breaks every opacity variant):

:root {
  --vx-brand: custom;
  --vx-primary-600: 220 38 38;
}

There is no component-level font-family anywhere in the library — your font cascade wins.

Licence

Commercial, for the duration of an active Velocity X subscription. The source is served by the licence-gated endpoint, never by the public CDN.