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---
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category: Components
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type: Views
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title: Collapse
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---
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A content area which can be collapsed and expanded.
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## When To Use
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- Can be used to group or hide complex regions to keep the page clean.
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- `Accordion` is a special kind of `Collapse`, which allows only one panel to be expanded at a time.
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## API
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### Collapse
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| Property | Description | Type | Default |
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|----------|----------------|----------|--------------|
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| activeKey | key of the active panel | Array or String | No default value. In `accordion` mode, it's the key of the first panel. |
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| defaultActiveKey | key of the initialized active panel | String | - |
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| onChange | a callback function, which can be executed when you switch the panels | Function | - |
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### Collapse.Panel
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| Property | Description | Type | Default |
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|----------|----------------|----------|--------------|
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| key | corresponds to the `activeKey` | String | - |
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| header | title of the panel | React.Element or String | - |
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