Layout
Affix
Keeps important controls visible after their original position scrolls out of view.
01
See it and copy it
Framework example
Choose Astro, React, or Elements to compare native usage against the shared visual output. Each example assumes the framework-level setup is already complete.
Framework usage
Switch targets to compare the adapter code. The preview stays visually stable because all three packages share the same tokens andui-* class contract.---
import { Affix, Button } from '@santi020k/lumen-astro'
---
<Affix offset={64}>
<Button>Sticky Button</Button>
</Affix>import { Affix, Button } from '@santi020k/lumen-react'
export const Example = () => (
<>
<Affix offset={64}>
<Button>Sticky Button</Button>
</Affix>
</>
)<script type="module">
import { defineLumenElements } from '@santi020k/lumen-elements/define'
defineLumenElements()
</script>
<lumen-affix offset="64">
<lumen-button>Sticky Button</lumen-button>
</lumen-affix>02
Choose your target
Add this component
Choose the package for your runtime. All adapters share the Lumen stylesheet. Use the matching registry command when you want a local wrapper for that framework.
pnpm add @santi020k/lumen-astropnpm add @santi020k/lumen-astrolumen add Affixlumen add Affixpnpm add @santi020k/lumen-reactpnpm add @santi020k/lumen-reactlumen add Affix --target reactlumen add Affix --target reactpnpm add @santi020k/lumen-elementspnpm add @santi020k/lumen-elementslumen add Affix --target elementslumen add Affix --target elementsAPI reference
Lumen-specific props and runtime attributes for the Astro primitive. React props follow the same names; Elements use equivalent kebab-case attributes where custom elements expose them.
| Attribute | Values | Default | Description |
|---|---|---|---|
| position | "top" | "bottom" | "top" | Selects the viewport edge used for sticky positioning. |
| offset, offsetTop, offsetBottom | number | 0 | Sets the sticky inset in pixels; edge-specific values override offset. |
| class, className | string | "" | Merges custom classes with the generated ui-* root classes. |
| ...native attributes | HTML attributes | - | Forwards standard attributes to the root element unless the component consumes them. |