# Vue Bootstrap Collapse Component

> Learn how to use CoreUI’s Vue Collapse component with Bootstrap styles for flexible, framework-consistent UI.

## 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
<template>
  <CButton color="primary" href="#" @click.prevent="visible = !visible">Link</CButton>
  <CButton color="primary" @click="visible = !visible">Button</CButton>
  <CCollapse :visible="visible">
    <CCard class="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>
</template>

<script setup>
import { CButton, CCollapse, CCard, CCardBody } from '@coreui/vue'
import { ref } from 'vue'
const visible = ref(false)
const visibleHorizontal = ref(false)
const visibleA = ref(false)
const visibleB = ref(false)
</script>
```
  
</Example>

## 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
<template>
  <CButton
    class="mb-3"
    color="primary"
    aria-expanded="{visible}"
    aria-controls="collapseWidthExample"
    @click="visibleHorizontal = !visibleHorizontal"
    >Button</CButton
  >
  <div style="min-height: 120px">
    <CCollapse horizontal :visible="visibleHorizontal">
      <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>
</template>

<script setup>
import { CButton, CCollapse, CCard, CCardBody } from '@coreui/vue'
import { ref } from 'vue'
const visible = ref(false)
const visibleHorizontal = ref(false)
const visibleA = ref(false)
const visibleB = ref(false)
</script>
```
  
</Example>

## Multiple targets

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

```html
<template>
  <CButton color="primary" @click="visibleA = !visibleA">Toggle first element</CButton>
  <CButton color="primary" @click="visibleB = !visibleB">Toggle second element</CButton>
  <CButton
    color="primary"
    @click="
      () => {
        visibleA = !visibleA
        visibleB = !visibleB
      }
    "
  >
    Toggle both elements
  </CButton>
  <CRow>
    <CCol xs="6">
      <CCollapse :visible="visibleA">
        <CCard class="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 class="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>
</template>

<script setup>
import { CButton, CRow, CCol, CCollapse, CCard, CCardBody } from '@coreui/vue'
import { ref } from 'vue'
const visible = ref(false)
const visibleHorizontal = ref(false)
const visibleA = ref(false)
const visibleB = ref(false)
</script>
```
  
</Example>