SelectV2
The SelectV2 component allows you to choose one or multiple options from a
collapsed dropdown with options.
Import
import { SelectV2 } from '@dynatrace/strato-components-preview/forms';
Use cases
Use multiple selection
The SelectV2 supports multiple selection. You can enable that by adding the
multiple prop. If enabled, the "Select all" option gets added automatically.
Group options together
You can use the SelectV2.Groups to group more options in the same group.
Control the state
The SelectV2 can also be controlled, meaning that you can handle the selection
state. To do so, you need to use the onChange prop to provide a handler that
is called when the internal state changes. That state can be modified and is
applied as soon as it's passed to the value prop.
Show a custom placeholder
You can use the SelectV2.Trigger component to show a placeholder for the
trigger button by adding the placeholder prop. If no option is selected, the
placeholder value is shown by default. Notice that the clearable prop is
used here to enable empty selection.
Show a custom display value
You can use the SelectV2.DisplayValue component to customize what is rendered
on the trigger. By default, the placeholder is shown when no option is selected.
You can also render content inside a SelectV2.Prefix component to show an icon
in front of the trigger display value for example. When you select a value, the
content inside the SelectV2.DisplayValue slot is then rendered inside the
trigger.
Customize the trigger
You can use the SelectV2.CustomTrigger component to render custom content
inside the trigger slot, so you can control the styling or its rendered text.
As the SelectV2 component renders a hidden input inside the trigger for forms
integration, if you're using an interactive element (e.g. a <button>) as
trigger, you would run into accessibility issues due to nesting interactive
items. Therefore, you would need to polymorph it to a non-interactive element
(e.g. a <div>) and take care of the focus styling yourself. To do so, you can
use the useFocusRing utility and pass it the focusWithin option, which
returns the necessary focus styles if an embedded element gains the focus. See
the useFocusRing documentation for
more details.
Disable options
In the SelectV2, you can disable each option separately by adding the
disabled prop on the SelectV2.Option component. Otherwise, if you need to
disable the whole SelectV2 component, you can add the disabled prop
directly.
Make the selection clearable
In a single select, the clearable prop adds a button to the overlay when an
option is selected to allow users to deselect the option. By default,
clearable is set to false for the single select and true if multiple
selection is enabled. For the multi-select, an option is added to select or
deselect all options.
Filter options
You can search through options by adding the SelectV2.Filter component. This
renders a search input, where you can type the filtering term and filter the
options on the client-side. If no options are found after filtering, you can
also customize the shown message by adding content to the SelectV2.EmptyState
component, which is only valid within the SelectV2.Content element. Otherwise,
the default message is shown: "No items found.".
Control the filtering of the options
You can also control the filtering of the options by adding the value and the
onFilterChange props on the SelectV2.Filter component.
Filter complex options
If you're using a custom component as SelectV2.Option, the text value of this
option can't be determined automatically. To enable the filtering of these
options and to show which option is selected, you need to provide a textValue
with a string representation of the SelectV2.Option.
Add icons to options
The SelectV2.SelectOption component allows adding icons in front of the option
node with the SelectV2.Prefix or after it with the SelectV2.Suffix. The same
can be done to add prefix and suffix icons inside the SelectV2.DisplayValue
slot, as shown above.
Show the loading state
You can show the loading state of the SelectV2.Option components by adding the
loading prop to the SelectV2.Content component.
Set the width of the trigger
You can set the width of the trigger by adding the width prop on the
SelectV2.Trigger component and either giving it a fixed value or setting it to
full, which would adjust it to the width of its container. By default, it's
set to content, so it adjusts to the width of the trigger content.
Set the width of the content
You can set the width of the content by adding the width prop on the
SelectV2.Content component and giving it a fixed value. By default, it has a
min-width of 96px and adjusts to the size of the trigger. If the text of the
options is overflowing, the text is truncated at the end by default. However,
you can also add the TextEllipsis component directly inside the
SelectV2.Option and wrap the text inside it to set the truncation to the start
or middle, if necessary. See
the TextEllipsis documentation for
more details.
Pass large amounts of data
The SelectV2 can handle large amounts of options. If the content is too large
to fit, the select options are virtualized.
Show selected options first
In the SelectV2, you can use the showSelectedOptionsFirst prop to configure
whether the options should be reordered to show the selected options at the top.
If this is set to true the options will be reordered when the overlay is
closed and opened again. For elected options inside an SelectV2.Group, this
will position its group at the top, as well as order the option to the top
within the group.
Validate
This example shows how you can validate the SelectV2 using the
react-hook-form package, which handles error messages. For connecting the form
with the SelectV2 and validating, you need to register the field with custom
error messages and use the useForm hook from react-hook-form. Also, by using
the controlState prop, you can override the error messages and connect the
SelectV2's error state and message to that of the form. This shows a hint in
case of an error and applies proper styling to the component. You can also add
custom validation logic when registering the SelectV2 by passing in a
validate function to the register options.
React to open state changes
In the SelectV2 you can react to changes to the open state using the
onOpenChange prop. This prop expects a callback method which receives the new
open state as a single boolean argument.