# React Collapse Component

> React collapse component toggles the visibility of content across your project with a few classes and some scripts. Useful for a large amount of content.

## How it works

The collapse component is used to show and hide content. Buttons or anchors are used as triggers that are mapped to specific elements you toggle. Collapsing an element will animate the `height` from its current value to `0`. Given how CSS handles animations, you cannot use `padding` on a `.collapse` element. Instead, use the class as an independent wrapping element.

## Example

You can use a link or a button component.

```html
import React, { useState } from 'react'
import { CButton, CCollapse, CCard, CCardBody } from '@coreui/react'

export const CollapseExample = () => {
  const [visible, setVisible] = useState(false)
  return (
    <>
      <CButton
        color="primary"
        href="#"
        onClick={(event) => {
          event.preventDefault()
          setVisible(!visible)
        }}
      >
        Link
      </CButton>
      <CButton color="primary" onClick={() => setVisible(!visible)}>
        Button
      </CButton>
      <CCollapse visible={visible}>
        <CCard className="mt-3">
          <CCardBody>
            Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad
            squid. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt
            sapiente ea proident.
          </CCardBody>
        </CCard>
      </CCollapse>
    </>
  )
}
```

## Horizontal

The collapse plugin also supports horizontal collapsing. Add the `horizontal` property to transition the `width` instead of `height` and set a `width` on the immediate child element.

```html
import React, { useState } from 'react'
import { CButton, CCollapse, CCard, CCardBody } from '@coreui/react'

export const CollapseHorizontalExample = () => {
  const [visible, setVisible] = useState(false)
  return (
    <>
      <CButton
        color="primary"
        className="mb-3"
        onClick={() => setVisible(!visible)}
        aria-expanded={visible}
        aria-controls="collapseWidthExample"
      >
        Button
      </CButton>
      <div style={{ minHeight: '120px' }}>
        <CCollapse id="collapseWidthExample" horizontal visible={visible}>
          <CCard style={{ width: '300px' }}>
            <CCardBody>
              This is some placeholder content for a horizontal collapse. It's hidden by default and
              shown when triggered.
            </CCardBody>
          </CCard>
        </CCollapse>
      </div>
    </>
  )
}
```

## Multiple targets

A `<CButton>` can show and hide multiple elements.

```html
import React, { useState } from 'react'
import { CButton, CCollapse, CCard, CCardBody, CCol, CRow } from '@coreui/react'

export const CollapseMultipleTargetsExample = () => {
  const [visibleA, setVisibleA] = useState(false)
  const [visibleB, setVisibleB] = useState(false)
  return (
    <>
      <CButton color="primary" onClick={() => setVisibleA(!visibleA)}>
        Toggle first element
      </CButton>
      <CButton color="primary" onClick={() => setVisibleB(!visibleB)}>
        Toggle second element
      </CButton>
      <CButton
        color="primary"
        onClick={() => {
          setVisibleA(!visibleA)
          setVisibleB(!visibleB)
        }}
      >
        Toggle both elements
      </CButton>
      <CRow>
        <CCol xs={6}>
          <CCollapse visible={visibleA}>
            <CCard className="mt-3">
              <CCardBody>
                Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry
                richardson ad squid. Nihil anim keffiyeh helvetica, craft beer labore wes anderson
                cred nesciunt sapiente ea proident.
              </CCardBody>
            </CCard>
          </CCollapse>
        </CCol>
        <CCol xs={6}>
          <CCollapse visible={visibleB}>
            <CCard className="mt-3">
              <CCardBody>
                Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry
                richardson ad squid. Nihil anim keffiyeh helvetica, craft beer labore wes anderson
                cred nesciunt sapiente ea proident.
              </CCardBody>
            </CCard>
          </CCollapse>
        </CCol>
      </CRow>
    </>
  )
}
```

## API

Check out the documentation below for a comprehensive guide to all the props you can use with the components mentioned here.

- [&lt;CCollapse /&gt;](./api/#ccollapse)