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feat(docs): Improved collapse examples and documentation
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‎docs/components/collapse/README.md‎

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# Collapse
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> The Bootstrap `<b-collapse>` component and `v-b-toggle` directive allows you to
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toggle content visibility on your pages.
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> The Bootstrap-Vue `<b-collapse>` component and `v-b-toggle` directive allows you to
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toggle content visibility on your pages. Includes support for making accordions.
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**Example 1:** Basic collapse
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```html
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<div>
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<p>
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<b-btn v-b-toggle.collapse1 variant="primary">Toggle Collapse</b-btn>
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</p>
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<b-collapse id="collapse1">
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<b-card>
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Collapse contents Here
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<b-btn v-b-toggle.collapse2 size="sm">Toggle Inner Collapse</b-btn>
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<b-collapse id=collapse2 class="mt-2">
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<b-card>Hello!</b-card>
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<b-collapse id="collapse1" class="mt-2">
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<b-card>
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<p class="card-text">Collapse contents Here</p>
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<b-btn v-b-toggle.collapse1_inner size="sm">Toggle Inner Collapse</b-btn>
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<b-collapse id=collapse1_inner class="mt-2">
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<b-card>Hello!</b-card>
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</b-collapse>
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</b-card>
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</b-card>
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</b-collapse>
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</div>
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<!-- collapse-1.vue -->
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```
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**Example 2:** Accordion
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```html
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<div>
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<b-btn block v-b-toggle.accordion1 variant="primary">Accordion 1</b-btn>
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<b-collapse id="accordion1" visible accordion="my-accordion">
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<b-card>
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Accordion 1 contents Here
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</b-card>
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</b-collapse>
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<b-btn block class="mt-1" v-b-toggle.accordion2 variant="primary">Accordion 2</b-btn>
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<b-collapse id="accordion2" accordion="my-accordion">
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<b-card>
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Accordion 2 contents Here
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</b-card>
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</b-collapse>
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<b-btn block class="mt-1" v-b-toggle.accordion3 variant="primary">Accordion 3</b-btn>
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<b-collapse id="accordion3" accordion="my-accordion">
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<b-card>
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Accordion 3 contents Here
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</b-card>
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</b-collapse>
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</div>
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<!-- collapse-2.vue -->
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```
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## Usage
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Other elements can easily toggle `<b-collapse>` components using the `v-b-toggle` directive.
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```html
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<!-- Using modifiers -->
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<b-btn v-b-toggle.collapse1>Toggle Collapse</b-btn>
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<div>
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<!-- Using modifiers -->
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<b-btn v-b-toggle.collapse2 class="m-1">Toggle Collapse</b-btn>
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<!-- Using value -->
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<b-btn v-b-toggle="'collapse1'">Toggle Collapse</b-btn>
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<!-- Using value -->
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<b-btn v-b-toggle="'collapse2'" class="m-1">Toggle Collapse</b-btn>
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<!-- element to collapse -->
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<b-collapse id="collapse1">
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<!-- element to collapse -->
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<b-collapse id="collapse2">
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<b-card>
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I am collapsable content!
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</b-card>
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</b-collapse>
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</b-collapse>
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</div>
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<!-- collapse-2.vue -->
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```
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### Initial visibility (start expanded)
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To make the `<b-collapse>` show initially, set the `visible` prop:
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```html
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<b-btn v-b-toggle.collapse1>Toggle Collapse</b-btn>
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<b-collapse visible id="collapse1">
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<div>
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<b-btn v-b-toggle.collapse3 class="m-1">Toggle Collapse</b-btn>
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<b-collapse visible id="collapse3">
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<b-card>
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I should start open!
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</b-card>
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</b-collapse>
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</b-collapse>
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</div>
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<!-- collapse-3.vue -->
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```
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The component's collapsed (visible) state can also be set with `v-model` which binds to the visible prop:
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### `v-model` support
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The component's collapsed (visible) state can also be set with `v-model` which
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binds internally to the `visible` prop.
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```html
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<b-btn @click="showCollapse = !showCollapse">Toggle Collapse</b-btn>
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Note, when using v-model to control `<b-collapse>`, the `aria-*` attributes and
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class `collapsed` are not automaticaly placed on the trigger button (as is the case
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when using the `v-b-toggle` directive). In this example we must control them ourselves.
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<b-collapse v-model="showCollapse" id="collapse1">
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<b-card>
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I should start open!
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</b-card>
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</b-collapse>
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```html
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<template>
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<div>
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<b-btn @click="showCollapse = !showCollapse"
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:class="showCollapse ? 'collapsed' : null"
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aria-controls="collapse4"
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:aria-expanded="showCollapse ? 'true' : 'false'">
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Toggle Collapse
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</b-btn>
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<b-collapse class="mt-2" v-model="showCollapse" id="collapse4">
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<b-card>
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I should start open!
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</b-card>
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</b-collapse>
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</div>
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</template>
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<script>
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{
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// inside the vue
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data() {
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return {
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showCollapse: true
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}
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}
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}
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export default {
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data: {
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showCollapse: true
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}
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};
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</script>
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<-- collapse-4.vue -->
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```
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### Trigger multiple collapse elements
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You can even collapse multiple `<b-collapse>` components via a single `v-b-toggle` by
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providing multiple target ids using modifers:
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providing multiple target IDs using modifers:
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```html
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<b-btn v-b-toggle.collapse1.collapse2>Toggle Collapse 1 and 2</b-btn>
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<div>
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<!-- Single button triggers two b-collapse components -->
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<b-btn v-b-toggle.collapseA.collapseB>Toggle Both Collapse A and B</b-btn>
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<!-- elements to collapse -->
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<b-collapse id="collapse1">
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<!-- elements to collapse -->
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<b-collapse id="collapsA" class="mt-2">
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<b-card>
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I am collapsable content 1!
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I am collapsable content A!
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</b-card>
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</b-collapse>
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<b-collapse id="collapse2">
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</b-collapse>
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<b-collapse id="collapseB" class="mt-2">
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<b-card>
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I am collapsable content 2!
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I am collapsable content B!
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</b-card>
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</b-collapse>
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</b-collapse>
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</div>
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<!-- collapse-mult-1.vue -->
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```
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### Accordion Support
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## Accordion Support
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Turn a group of `<b-collapse>` components into an accordion by supplying
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an accordion group identifier via the `accordion` prop:
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```html
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<b-btn block v-b-toggle.collapse1>Collapsible Group 1</b-btn>
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<b-collapse id="collapse1" accordion="my-accordion" visible>
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<b-card>
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Accordion Panel 1<br>
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I start opened because <code>visible</code> is <code>true</code>
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</b-card>
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</b-collapse>
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<b-btn block class="mt-2" v-b-toggle.collapse2>Collapsible Group 2</b-btn>
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<b-collapse id="collapse2" accordion="my-accordion">
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<b-card>
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Accordion Panel 2
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</b-card>
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</b-collapse>
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<b-btn block class="mt-2" v-b-toggle.collapse3>Collapsible Group 3</b-btn>
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<b-collapse id="collapse3" accordion="my-accordion">
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<b-card>
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Accordion Panel 3
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</b-card>
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</b-collapse>
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<div>
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<b-card no-body>
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<b-card-header class="p-1">
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<b-btn block v-b-toggle.accordion1 variant="info">Accordion 1</b-btn>
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</b-card-header>
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<b-collapse id="accordion1" visible accordion="my-accordion">
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<b-card-body>
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<p class="card-text">
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I start opened because <code>visible</code> is <code>true</code>
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</p>
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<p class="card-text">
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Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry
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richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor
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brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon
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tempor, sunt aliqua put a bird on it squid single-origin coffee nulla
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assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore
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wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher
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vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic
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synth nesciunt you probably haven't heard of them accusamus labore VHS.
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</p>
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</b-card-body>
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</b-collapse>
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<b-card-header class="p-1">
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<b-btn block v-b-toggle.accordion2 variant="info">Accordion 2</b-btn>
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</b-card-header>
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<b-collapse id="accordion2" accordion="my-accordion">
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<b-card-body>
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<p class="card-text">
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Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry
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richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor
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brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon
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tempor, sunt aliqua put a bird on it squid single-origin coffee nulla
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assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore
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wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher
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vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic
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synth nesciunt you probably haven't heard of them accusamus labore VHS.
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</p>
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</b-card-body>
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</b-collapse>
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<b-card-header class="p-1">
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<b-btn block v-b-toggle.accordion3 variant="info">Accordion 3</b-btn>
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</b-card-header>
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<b-collapse id="accordion3" accordion="my-accordion">
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<b-card-body>
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<p class="card-text">
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Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry
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richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor
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brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon
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tempor, sunt aliqua put a bird on it squid single-origin coffee nulla
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assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore
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wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher
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vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic
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synth nesciunt you probably haven't heard of them accusamus labore VHS.
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</p>
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</b-card-body>
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</b-collapse>
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</b-card>
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</div>
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<!-- accordion-1.vue -->
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```
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**Notes:**
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- If using the `v-model` feature of `<b-collaspe>` in accordion mode, do not
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bind the `v-model` or `visible` of all the collapses in the accordion group to the same variable.
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- If using the `v-model` feature of `<b-collaspe>` in accordion mode, do not bind the
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`v-model` or `visible` prop of all the collapses in the accordion group to the same variable!
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- Ensure, at most, only one `<b-collapse>` in the accordion group has the `visible`
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prop and/or `v-model` set to `true`.
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### Accessibility
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The `v-b-toggle` directive will automatically add the ARIA attributes `aria-controls` and `aria-expanded`
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to the component that the directive appears on. `aria-expanded` will reflect the state of
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the tartget `<b-collapse>` component, while `aria-controls` will be set to the ID(s)
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of the target `<b-collapse>` component(s).
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## Hiding and showing content in the toggle button based on collapse state
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When using the `v-b-toggle` directive, the class `collapsed` will automatically be placed
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on the trigger element when the collapse is closed, and removed when open. You can
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use this class to display or hide content within the togger via custom CSS:
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**Example HTML markup:**
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```html
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<b-btn v-b-toggle.myCollapse>
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<span class="when-opened">Close</span>
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<span class="when-closed">Open</span>
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My Collapse
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</b-btn>
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<b-collapse id="myCollapse">
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<!-- content here -->
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</b-collapse>
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```
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**Example Custom CSS:**
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```css
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.collapsed > .when-opened,
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:not(.collapsed) > .when-closed {
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display: none;
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}
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```
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## Accessibility
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The `v-b-toggle` directive will automatically add the ARIA attributes `aria-controls` and `aria-expanded`
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to the component that the directive appears on (as well as add the class `collapsed` when not expanded).
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`aria-expanded` will reflect the state of the tartget `<b-collapse>` component, while `aria-controls`
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will be set to the ID(s) of the target `<b-collapse>` component(s).
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If using `v-model` to set the visible state instead of the directive `v-b-toggle`, you will be
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required to, on the toggle element, add and control the attributes/class yourself.
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While the `v-b-toggle` directive can be placed on almost any HTML element or Vue component, it is
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reccomended to use a button or link (or similar component) to act as your toggler. Otherwise your
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trigger elements may be inaccessible to keyboard or screen reader users. If you do place them on
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something other than a button or link (or similar component), you should add the attributes
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`tabindex="0"` and `role="button"` to allow users of assistive technology to reach your
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trigger element.

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