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38 lines
1.5 KiB
Markdown
38 lines
1.5 KiB
Markdown
---
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category: Components
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type: Navigation
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title: Affix
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cover: https://gw.alipayobjects.com/zos/alicdn/tX6-md4H6/Affix.svg
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---
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Wrap Affix around another component to make it stick the viewport.
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## When To Use
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On longer web pages, it's helpful to stick component into the viewport. This is common for menus and actions.
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Please note that Affix should not cover other content on the page, especially when the size of the viewport is small.
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## API
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| Property | Description | Type | Default |
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| --- | --- | --- | --- |
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| offsetBottom | Offset from the bottom of the viewport (in pixels) | number | - |
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| offsetTop | Offset from the top of the viewport (in pixels) | number | 0 |
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| target | Specifies the scrollable area DOM node | () => HTMLElement | () => window |
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| onChange | Callback for when Affix state is changed | function(affixed) | - |
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**Note:** Children of `Affix` must not have the property `position: absolute`, but you can set `position: absolute` on `Affix` itself:
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```jsx
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<Affix style={{ position: 'absolute', top: y, left: x }}>...</Affix>
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```
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## FAQ
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### Affix bind container with `target`, sometime move out of container.
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We don't listen window scroll for performance consideration. You can add listener if you still want: <https://codesandbox.io/s/2xyj5zr85p>
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Related issues：[#3938](https://github.com/ant-design/ant-design/issues/3938) [#5642](https://github.com/ant-design/ant-design/issues/5642) [#16120](https://github.com/ant-design/ant-design/issues/16120)
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