ant-design/components/collapse/index.en-US.md
Wei Zhu 77b78a9389 docs: Unify type naming (#4636)
* Unify name of ReactNode type in document

* Lowser all string type name

* Lowercase all number type name

* Lowercase all boolean type name

* Unify array type

* Lowercase all object type name

* Unify mutilple types
2017-01-20 20:10:50 +08:00

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Markdown

---
category: Components
type: Data Display
title: Collapse
cols: 1
---
A content area which can be collapsed and expanded.
## When To Use
- Can be used to group or hide complex regions to keep the page clean.
- `Accordion` is a special kind of `Collapse`, which allows only one panel to be expanded at a time.
## API
### Collapse
| Property | Description | Type | Default |
|----------|----------------|----------|--------------|
| activeKey | key of the active panel | string[]\|string | No default value. In `accordion` mode, it's the key of the first panel. |
| defaultActiveKey | key of the initialized active panel | string | - |
| onChange | a callback function, which can be executed when you switch the panels | Function | - |
### Collapse.Panel
| Property | Description | Type | Default |
|----------|----------------|----------|--------------|
| key | corresponds to the `activeKey` | string | - |
| header | title of the panel | string\|ReactNode | - |