carbon-components
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Carbon Components is a component library for IBM Cloud
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# `multi-select`
### SCSS
#### Classes
| Name | Description |
| :------------------ | :--------------------------------------------------- |
| `.bx--multi-select` | Used on a container node to specify its control type |
#### Using Form Validation
Carbon Components provides HTML attributes and CSS to enable form validation for each input or control.
For example, here's a **Multiselect** that provides a message if an option is not selected.
```html
<div role="listbox" tabindex="0" class="bx--multi-select bx--list-box" data-invalid="true">
<div
role="button"
class="bx--list-box__field"
tabindex="0"
type="button"
aria-label="open menu"
aria-expanded="false"
aria-haspopup="true"
data-toggle="true"
>
<span class="bx--list-box__label">MultiSelect Label</span>
<div class="bx--list-box__menu-icon">
<svg fill-rule="evenodd" height="5" role="img" viewBox="0 0 10 5" width="10" alt="Open menu" aria-label="Open menu">
<title>Open menu</title>
<path d="M0 0l5 4.998L10 0z"></path>
</svg>
</div>
</div>
</div>
<div class="bx--form-requirement">Please select an option.</div>
```
The `bx--form-requirement` element will be hidden until `data-invalid` attribute gets added to the `bx--multi-select`.
Validate the multiselect on your own and then use JavaScript to add the attribute if the multiselect value is invalid.