# Basic scrollspy

> Basic scrollspy

A shadcn/ui block from the [@reui](https://reui.io) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/reui/c-scrollspy-1).

- Page, with a live preview: https://shadcn.exchange/r/reui/c-scrollspy-1
- Screenshot: https://abzjhwgwpdpz7ua5.public.blob.vercel-storage.com/shots/reui/c-scrollspy-1-light-8dd31b5078e87bd7.png
- Registry item: https://reui.io/r/new-york-v4/c-scrollspy-1.json
- Listed: 2026-10-13, source last changed 2026-10-13

## Install

```bash
npx shadcn@latest add https://reui.io/r/new-york-v4/c-scrollspy-1.json
```

Run it in a project that has shadcn/ui set up. It adds the files below and installs what they depend on.

## Dependencies

- Registry items: `button`, `scroll-area`, `@reui/scrollspy`

## Files

### `c-scrollspy-1.tsx`

```tsx
"use client"

import { useRef } from "react"
import { Scrollspy } from "@/components/reui/scrollspy"

import { Button } from "@/components/ui/button"
import { ScrollArea } from "@/components/ui/scroll-area"

export function Pattern() {
  const parentRef = useRef<HTMLDivElement | null>(null)

  const nav = [
    {
      id: "section-1",
      label: "Section 1",
    },
    {
      id: "section-2",
      label: "Section 2",
    },
    {
      id: "section-3",
      label: "Section 3",
    },
    {
      id: "section-4",
      label: "Section 4",
    },
    {
      id: "section-5",
      label: "Section 5",
    },
  ]

  return (
    <div className="flex w-full grow gap-5">
      <div className="flex w-[150px] flex-col gap-2">
        <Scrollspy
          offset={50}
          targetRef={parentRef}
          className="flex flex-col gap-2.5"
        >
          {nav.map((item) => (
            <Button
              key={item.id}
              variant="outline"
              data-scrollspy-anchor={item.id}
              className={
                "data-[active=true]:bg-primary data-[active=true]:text-primary-foreground"
              }
            >
              {item.label}
            </Button>
          ))}
        </Scrollspy>
      </div>
      <div className="grow" ref={parentRef}>
        <ScrollArea className="-me-5 h-[500px] grow pe-5">
          <div className="space-y-8">
            {nav.map((item) => (
              <div key={item.id} id={item.id} className="space-y-2.5">
                <h3 className="text-foreground text-base">{item.label}</h3>
                <div className="bg-muted rounded-2xl h-[350px]"></div>
              </div>
            ))}
          </div>
        </ScrollArea>
      </div>
    </div>
  )
}
```