@leafygreen-ui/select

Select

View on MongoDB.design

Installation

Yarn

yarn add @leafygreen-ui/select

NPM

npm install @leafygreen-ui/select

Example

import { Option, OptionGroup, Select, Size } from '@leafygreen-ui/select';

<Select
  label="Label"
  description="Description"
  placeholder="Placeholder"
  name="Name"
  size={Size.Default}
  defaultValue="cat"
>
  <Option value="dog" description="Bark">
    Dog
  </Option>
  <Option value="cat">Cat</Option>
  <OptionGroup label="Less common">
    <Option value="hamster">Hamster</Option>
    <Option value="parrot">Parrot</Option>
  </OptionGroup>
</Select>;

Select Properties

Prop	Type	Description	Default
children	node	<Option /> and <OptionGroup /> elements.
className	string	Adds a className to the outermost element.
darkMode	boolean	Determines whether or not the component will appear in dark mode.	false
size	'xsmall', 'small', 'default', 'large'	Sets the size of the component's elements.	'default'
id	string	id associated with the Select component.
name	string	The name that will be used when submitted as part of a form.
label	string	Text shown in bold above the input element.
aria-labelledby	string	Must be provided if and only if neither label nor aria-label is not provided.
aria-label	string	Must be provided if and only if neither label nor aria-labelledby is not provided.
description	React.ReactNode	Text that gives more detail about the requirements for the input.
placeholder	string	The placeholder text shown in the input element when an option is not selected.	'Select'
disabled	boolean	Disables the component from being edited.	false
value	string	Sets the <Option /> that will appear selected and makes the component a controlled component.	''
defaultValue	string	Sets the <Option /> that will appear selected on page load when the component is uncontrolled.	''
onChange	function	A function that gets called when the selected value changes. Receives the value string as the first argument.	() => {}
readOnly	boolean	Disables the console warning when the component is controlled and no onChange prop is provided.	false
allowDeselect	boolean	Enables or disables the option for a user to select a null default value.	true
usePortal	boolean	Determines if Select dropdown will be rendered inside a portal.	true
portalContainer	HTMLElement | null	Sets the container used for the popover's portal. NOTE: If using a scrollContainer make sure that the portalContainer is contained within the scrollContainer. E.g, passing the same refrence to scrollContainer and portalContainer.
scrollContainer	HTMLElement | null	If the popover portal has a scrollable ancestor other than the window, this prop allows passing a reference to that lement to allow the portal to position properly.
portalClassName	string	Passes the given className to the popover's portal container if the default portal container is being used.
popoverZIndex	number	Sets the z-index CSS property for the popover.
state	'none', 'error'	Determines the state of the <select>	'none'
errorMessage	string	Text that shows when the state is set to error.
baseFontSize	'13', '16'	Determines the base font size if sizeVariant is set to default	'13'
dropdownWidthBasis	'option' | 'trigger'	Determines the width of the dropdown. trigger will make the dropdown width the width of the menu trigger. option will make the dropdown width as wide as the widest option.	trigger

Option

Prop	Type	Description	Default
children	string, number	Content to appear inside of the component.
className	string	Adds a className to the outermost element.
glyph	React.ReactElement	Icon to display next to the option text.
value	string	Corresponds to the value passed into the onChange prop of <Select /> when the option is selected.	text contents of children
description	string	Optional descriptive text under the value
disabled	boolean	Prevents the option from being selectable.	false

OptionGroup

Prop	Type	Description	Default
children	node	<Option /> elements
className	string	Adds a className to the outermost element.
label	string	Text shown above the group's options.
disabled	boolean	Prevents all the contained options from being selectable.	false

Test Harnesses

getTestUtils()

getTestUtils() is a util that allows consumers to reliably interact with LG Select in a product test suite. If the Select component cannot be found, an error will be thrown.

Usage

import { Select, getTestUtils } from '@leafygreen-ui/select';

const utils = getTestUtils(lgId?: string); // lgId refers to the custom `data-lgid` attribute passed to `Select`. It defaults to 'lg-select' if left empty.

Single Select

import { render } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import { Select, getTestUtils } from '@leafygreen-ui/select';

...

test('select', () => {
  render(
    <Select
      label="Label"
      description="Description"
    >
      <Option value="dog" description="Bark">
        Dog
      </Option>
      <Option value="cat">Cat</Option>
      <OptionGroup label="Less common">
        <Option value="hamster">Hamster</Option>
        <Option value="parrot">Parrot</Option>
      </OptionGroup>
    </Select>
  );

  const { getInputValue, getInput, getOptions } = getTestUtils();

  expect(getInput()).toBeInTheDocument();
  expect(getInputValue()).toBe('Select');

  // opens the select
  userEvent.click(getInput());
  // `select` is an option
  expect(getOptions()).toHaveLength(5);
});

Multiple Select's

When testing multiple Select's it is recommended to add the custom data-lgid attribute to each Select.

import { render } from '@testing-library/react';
import { Select, getTestUtils } from '@leafygreen-ui/select';

...

test('select', () => {
  render(
    <>
      <Select
        label="Label 1"
        description="Description 1"
        data-lgid="select-1"
      >
        <Option value="dog" description="Bark">
          Dog
        </Option>
        <Option value="cat">Cat</Option>
        <OptionGroup label="Less common">
          <Option value="hamster">Hamster</Option>
          <Option value="parrot">Parrot</Option>
        </OptionGroup>
      </Select>
      <Select
        label="Label 2"
        description="Description 2"
        data-lgid="select-2"
        defaultValue="sad cat"
      >
        <Option value="sad dog" description="Sad Bark Bark">
          Sad Dog
        </Option>
        <Option value="sad cat">Sad Cat</Option>
        <OptionGroup label="Less common">
          <Option value="sad hamster">Sad Hamster</Option>
          <Option value="sad parrot">Sad Parrot</Option>
        </OptionGroup>
      </Select>
    </>,
  );
  const lgUtilsSelect1 = getTestUtils('select-1'); // data-lgid
  const lgUtilsSelect2 = getTestUtils('select-2'); // data-lgid

  // First Select
  expect(lgUtilsSelect1.getInput()).toBeInTheDocument();
  expect(lgUtilsSelect1.getInputValue()).toBe('Select');

  // Second Select
  expect(lgUtilsSelect2.getInput()).toBeInTheDocument();
  expect(lgUtilsSelect2.getInputValue()).toBe('sad cat');
});

Select with other LG elements

import { render } from '@testing-library/react';
import TextInput, { getTestUtils as getTextInputTestUtils } from '@leafygreen-ui/text-input';
import { Select, getTestUtils as getSelectTestUtils } from '@leafygreen-ui/select';

...

test('Form', () => {
  render(
    <Form>
      <TextInput label="TextInput label" />
      <Select
        label="Label 1"
        description="Description 1"
      >
        <Option value="dog" description="Bark">
          Dog
        </Option>
        <Option value="cat">Cat</Option>
        <OptionGroup label="Less common">
          <Option value="hamster">Hamster</Option>
          <Option value="parrot">Parrot</Option>
        </OptionGroup>
      </Select>
    </Form>,
  );

  const lgUtilsTextInput = getTextInputTestUtils();
  const lgUtilsSelect = getSelectTestUtils();

  // LG TextInput
  expect(lgUtilsTextInput.getInput()).toBeInTheDocument();
  expect(lgUtilsTextInput.getInputValue()).toBe('');

  // LG Select
  expect(lgUtilsSelect.getInput()).toBeInTheDocument();
  expect(lgUtilsSelect.getInputValue()).toBe('Select');
});

Test Utils

Elements

const {
  getInput,
  getLabel,
  getDescription,
  getErrorMessage,
  getOptions,
  getOptionByValue,
  getPopover,
  getInputValue,
  isDisabled,
  isValid,
  isError,
} = getTestUtils();

Util	Description	Returns
getInput()	Returns the input node	HTMLButtonElement
getLabel()	Returns the label node	HTMLButtonElement | null
getDescription()	Returns the description node	HTMLButtonElement | null
getErrorMessage()	Returns the error message node	HTMLButtonElement | null
getOptions()	Returns an array of options	Array<HTMLLIElement>
getOptionByValue(string)	Returns an individual option	HTMLLIElement | null
getPopover()	Returns the dropdown popover	HTMLDivElement | null
getInputValue()	Returns the input value	string
isDisabled()	Returns whether the input is disabled	boolean
isError()	Returns whether the input state is error	boolean