61 lines
2.2 KiB
Markdown
61 lines
2.2 KiB
Markdown
# Combobox >> Overview ||10
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A combobox is a widget made up of the combination of two distinct elements:
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- a single-line textbox
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- an associated listbox overlay
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Based on the combobox configuration and entered textbox value, options in the listbox will be
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filtered, checked, focused and the textbox value may be autocompleted.
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Optionally, the combobox contains a graphical button adjacent to the textbox, indicating the
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availability of the pop-up.
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> Fore more information, consult [Combobox wai-aria design pattern](https://www.w3.org/TR/wai-aria-practices/#combobox)
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```js script
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import { html } from '@mdjs/mdjs-preview';
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import { listboxData } from '../listbox/src/listboxData.js';
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import '@lion/ui/define/lion-combobox.js';
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import '@lion/ui/define/lion-option.js';
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import { lazyRender } from './src/lazyRender.js';
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```
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```js preview-story
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export const main = () => html`
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<lion-combobox name="combo" label="Default">
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${lazyRender(
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listboxData.map(
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(entry, i) =>
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html` <lion-option .checked="${i === 0}" .choiceValue="${entry}">${entry}</lion-option> `,
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),
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)}
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</lion-combobox>
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`;
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```
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[...show more](./extensions.md)
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## Features
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The combobox has many configurable properties to fine-tune its behaviour:
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- **Multiple choice** - Allows multiselection of options.
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- **requireOptionMatch**
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- **true** (default) - The listbox is leading, the textbox is a helping aid to quickly select an option/options. Unmatching input values become Unparseable, with the `MatchesOption` set as a default validator.
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- **false** - The textbox is leading, with the listbox as an aid to supply suggestions, e.g. a search input.
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- **Autocomplete** - When the autocompletion will happen: `none`, `list`, `inline` and `both`.
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- **Matchmode** - Which part of the value should match: `begin` and `all`.
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- **Show all on empty** - Shows the options list on empty.
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- **Selection follows focus** - When false the active/focused and checked/selected values will be kept track of independently.
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- **Rotate keyboard Navigation** - When false it won't rotate the navigation.
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## Installation
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```bash
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npm i --save @lion/ui
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```
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```js
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import '@lion/ui/define/lion-combobox.js';
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import '@lion/ui/define/lion-option.js';
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```
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