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---
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category: Components
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type: Navigation
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title: Affix
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---
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Make an element sticky to viewport.
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## When To Use
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When user browses a long web page, some content need 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 |
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|--------------|-----------------------|----------|--------------|
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| offsetTop | Pixels to offset from top when calculating position of scroll | Number | 0 |
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| offsetBottom | Pixels to offset from bottom when calculating position of scroll | Number | - |
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| onChange | Callback when affix state is changed | Function(affixed) | - |
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**Note:** Children of `Affix` can not be `position: absolute`, but you can set `Affix` as `position: absolute`:
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```jsx
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<Affix style={{ position: 'absolute', top: y, left: x}}>
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...
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</Affix>
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```
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