Listbox: Use Cases

Multiple choice

Add multiple-choice flag to allow multiple values to be selected. This will:

keep the listbox overlay open on click of an option
display a list of selected option representations next to the text box
make the value of type Array instead of String

<lion-listbox name="combo" label="Multiple" multiple-choice>
  <lion-option .choiceValue="${'Apple'}">Apple</lion-option>
  <lion-option .choiceValue="${'Artichoke'}">Artichoke</lion-option>
  <lion-option .choiceValue="${'Asparagus'}">Asparagus</lion-option>
  <lion-option .choiceValue="${'Banana'}">Banana</lion-option>
  <lion-option .choiceValue="${'Beets'}">Beets</lion-option>
  <lion-option .choiceValue="${'Bell pepper'}">Bell pepper</lion-option>
  <lion-option .choiceValue="${'Broccoli'}">Broccoli</lion-option>
  <lion-option .choiceValue="${'Brussels sprout'}">Brussels sprout</lion-option>
  <lion-option .choiceValue="${'Cabbage'}">Cabbage</lion-option>
  <lion-option .choiceValue="${'Carrot'}">Carrot</lion-option>
</lion-listbox>

Orientation

When orientation="horizontal", left and right arrow keys will be enabled, plus the screenreader will be informed about the direction of the options. By default, orientation="vertical" is set, which enables up and down arrow keys.

<lion-listbox name="combo" label="Orientation horizontal" orientation="horizontal">
  <lion-option .choiceValue="${'Apple'}">Apple</lion-option>
  <lion-option .choiceValue="${'Artichoke'}">Artichoke</lion-option>
  <lion-option .choiceValue="${'Asparagus'}">Asparagus</lion-option>
  <lion-option .choiceValue="${'Banana'}">Banana</lion-option>
  <lion-option .choiceValue="${'Beets'}">Beets</lion-option>
  <lion-option .choiceValue="${'Bell pepper'}">Bell pepper</lion-option>
  <lion-option .choiceValue="${'Broccoli'}">Broccoli</lion-option>
  <lion-option .choiceValue="${'Brussels sprout'}">Brussels sprout</lion-option>
  <lion-option .choiceValue="${'Cabbage'}">Cabbage</lion-option>
  <lion-option .choiceValue="${'Carrot'}">Carrot</lion-option>
</lion-listbox>

With multiple-choice flag configured, multiple options can be checked.

<lion-listbox
  name="combo"
  label="Orientation horizontal multiple"
  orientation="horizontal"
  multiple-choice
>
  <lion-option .choiceValue="${'Apple'}">Apple</lion-option>
  <lion-option .choiceValue="${'Artichoke'}">Artichoke</lion-option>
  <lion-option .choiceValue="${'Asparagus'}">Asparagus</lion-option>
  <lion-option .choiceValue="${'Banana'}">Banana</lion-option>
  <lion-option .choiceValue="${'Beets'}">Beets</lion-option>
  <lion-option .choiceValue="${'Bell pepper'}">Bell pepper</lion-option>
  <lion-option .choiceValue="${'Broccoli'}">Broccoli</lion-option>
  <lion-option .choiceValue="${'Brussels sprout'}">Brussels sprout</lion-option>
  <lion-option .choiceValue="${'Cabbage'}">Cabbage</lion-option>
  <lion-option .choiceValue="${'Carrot'}">Carrot</lion-option>
</lion-listbox>

Selection-follows-focus

When true, will synchronize activedescendant and selected element on arrow key navigation. This behavior can usually be seen in <select> on the Windows platform. Note that this behavior cannot be used when multiple-choice is true. See wai aria spec

<lion-listbox name="combo" label="Selection follows focus" selection-follows-focus>
  <lion-option .choiceValue="${'Apple'}">Apple</lion-option>
  <lion-option .choiceValue="${'Artichoke'}" disabled>Artichoke</lion-option>
  <lion-option .choiceValue="${'Asparagus'}">Asparagus</lion-option>
  <lion-option .choiceValue="${'Banana'}">Banana</lion-option>
  <lion-option .choiceValue="${'Beets'}">Beets</lion-option>
  <lion-option .choiceValue="${'Bell pepper'}">Bell pepper</lion-option>
  <lion-option .choiceValue="${'Broccoli'}">Broccoli</lion-option>
  <lion-option .choiceValue="${'Brussels sprout'}">Brussels sprout</lion-option>
  <lion-option .choiceValue="${'Cabbage'}">Cabbage</lion-option>
  <lion-option .choiceValue="${'Carrot'}">Carrot</lion-option>
</lion-listbox>

rotate-keyboard-navigation attribute on the listbox will give the first option active state when navigated to the next option from last option.

<lion-listbox name="combo" label="Rotate keyboard navigation" rotate-keyboard-navigation>
  <lion-option .choiceValue="${'Apple'}">Apple</lion-option>
  <lion-option .choiceValue="${'Artichoke'}">Artichoke</lion-option>
  <lion-option .choiceValue="${'Asparagus'}">Asparagus</lion-option>
  <lion-option .choiceValue="${'Banana'}">Banana</lion-option>
  <lion-option .choiceValue="${'Beets'}">Beets</lion-option>
  <lion-option .choiceValue="${'Bell pepper'}">Bell pepper</lion-option>
  <lion-option .choiceValue="${'Broccoli'}">Broccoli</lion-option>
  <lion-option .choiceValue="${'Brussels sprout'}">Brussels sprout</lion-option>
  <lion-option .choiceValue="${'Cabbage'}">Cabbage</lion-option>
  <lion-option .choiceValue="${'Carrot'}">Carrot</lion-option>
</lion-listbox>

Disabled options

Navigation will skip over disabled options. Let's disable Artichoke and Brussel sprout, because they're gross.

<lion-listbox name="combo" label="Rotate with disabled options" rotate-keyboard-navigation>
  <lion-option .choiceValue="${'Apple'}">Apple</lion-option>
  <lion-option .choiceValue="${'Artichoke'}" disabled>Artichoke</lion-option>
  <lion-option .choiceValue="${'Asparagus'}">Asparagus</lion-option>
  <lion-option .choiceValue="${'Banana'}">Banana</lion-option>
  <lion-option .choiceValue="${'Beets'}">Beets</lion-option>
  <lion-option .choiceValue="${'Bell pepper'}">Bell pepper</lion-option>
  <lion-option .choiceValue="${'Broccoli'}">Broccoli</lion-option>
  <lion-option .choiceValue="${'Brussels sprout'}" disabled>Brussels sprout</lion-option>
  <lion-option .choiceValue="${'Cabbage'}">Cabbage</lion-option>
  <lion-option .choiceValue="${'Carrot'}">Carrot</lion-option>
</lion-listbox>

Validation

A validator can be used to make it e.g. required. If you want to know how to do that, please take a look at our validation examples.

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