47 lines
2.1 KiB
Markdown
47 lines
2.1 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, its helpful for some content to stick to 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 | Version |
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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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### events
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| Events Name | Description | Arguments | Version |
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| ----------- | ---------------------------------------- | --------------------------- | ------- |
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| change | Callback for when Affix state is changed | (affixed?: boolean) => void | |
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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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```html
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<a-affix :style="{ position: 'absolute', top: y, left: x}">...</a-affix>
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```
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## FAQ
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### When binding container with `target` in Affix, elements sometimes move out of the container.
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We only listen to container scroll events for performance consideration. You can add custom listeners if you still want to, like react demo <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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### When Affix is used in a horizontal scroll container, the position of the element `left` is incorrect.
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Affix is generally only applicable to areas with one-way scrolling, and only supports usage in vertical scrolling containers. If you want to use it in a horizontal container, you can consider implementing with the native `position: sticky` property.
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