@spectrum-web-components/combobox v0.42.2
Description
An <sp-combobox>
allows users to filter lists to only the options matching a query. It's composed of a textfield, a picker button, and child menu items.
Usage
yarn add @spectrum-web-components/combobox
Import the side effectful registration of <sp-combobox>
via:
import '@spectrum-web-components/combobox/sp-combobox.js';
When looking to leverage the Combobox
base class as a type and/or for extension purposes, do so via:
import { Combobox } from '@spectrum-web-components/combobox';
Sizes
<sp-combobox size="s" label="Color">
<sp-menu-item value="red">Red</sp-menu-item>
<sp-menu-item value="green">Green</sp-menu-item>
<sp-menu-item value="blue">Blue</sp-menu-item>
</sp-combobox>
<sp-combobox size="m" label="Color">
<sp-menu-item value="red">Red</sp-menu-item>
<sp-menu-item value="green">Green</sp-menu-item>
<sp-menu-item value="blue">Blue</sp-menu-item>
</sp-combobox>
<sp-combobox size="l" label="Color">
<sp-menu-item value="red">Red</sp-menu-item>
<sp-menu-item value="green">Green</sp-menu-item>
<sp-menu-item value="blue">Blue</sp-menu-item>
</sp-combobox>
<sp-combobox size="xl" label="Color">
<sp-menu-item value="red">Red</sp-menu-item>
<sp-menu-item value="green">Green</sp-menu-item>
<sp-menu-item value="blue">Blue</sp-menu-item>
</sp-combobox>
Labeling
A combobox must be labeled.
Typically, you should render a visible label via <sp-field-label>
.
For exceptional cases, provide an accessible label via the label
attribute.
<sp-field-label for="color">Color</sp-field-label>
<sp-combobox id="color">
<sp-menu-item value="red">Red</sp-menu-item>
<sp-menu-item value="green">Green</sp-menu-item>
<sp-menu-item value="blue">Blue</sp-menu-item>
</sp-combobox>
Providing options
Combobox options are presented as a popup menu.
Menu items can be provided via markup as <sp-menu-item>
children, or by assigning an array to the options
property of an <sp-combobox>
.
Options property
Instead of providing <sp-menu-item>
children, you can assign an array of ComboboxOptions
to the options
property, and <sp-combobox>
will create matching menu items:
<sp-combobox id="color" label="Color"></sp-combobox>
<script>
document.getElementById('color').options = [
{ value: "red", itemText: "Red" },
{ value: "green", itemText: "Green" },
{ value: "blue", itemText: "Blue" }
];
</script>
Dynamic options
When you replace the options
Array, or add/remove <sp-menu-item>
children, the <sp-combobox>
will detect that change and update its popup menu contents.
For example, using Lit:
render() {
return html`<sp-combobox label="Color" .options=${this.colorOptions}></sp-combobox>`;
}
mutate() {
this.colorOptions = [
...this.colorOptions,
{ value: 'purple', itemText: 'Purple' }
];
}
Autocomplete
The text in an <sp-combobox>
is editable, and the string the user has typed in will become the value
of the combobox unless the user selects a different value in the popup menu.
None
autocomplete="none"
The suggested popup menu items will remain the same regardless of the currently-input value.
Whenever the currently-typed input exactly matches the value
of a popup menu item, that item is automatically selected.
List
autocomplete="list"
The popup menu items are filtered to only those completing the currently-input value.
Focus and Accessibility
The combobox supports both mouse and keyboard navigation. Mobile behavior is currently unspecified.
When an <sp-combobox>
is focused, pressing the down arrow moves focus to the first menu item in the popup menu.
The up and down arrows then move between available menu items.
The escape key dismisses the popup menu if open. Otherwise, it clears the combobox's textfield.
The enter key sets the value
of the focused <sp-combobox>
.
If the popup menu is open, the value is set to the value
of the selected menu item, returning focus back to the combobox's textfield.