@leafygreen-ui/text-input

Text Input

View on MongoDB.design

Installation

Yarn

yarn add @leafygreen-ui/text-input

NPM

npm install @leafygreen-ui/text-input

Peer Dependencies

Package	Version
@leafygreen-ui/leafygreen-provider	^1.1.0

Example

import TextInput from '@leafygreen-ui/text-input';

const [value, setValue] = useState('');

return (
  <TextInput
    label="Email"
    description="Enter your email below"
    placeholder="[e-mail]"
    onChange={event => {
      /* Something to handle the change event */
    }}
    value={value}
  />
);

Properties

Prop	Type	Description	Default
id	string	id associated with the TextInput component.
label	string	Text shown in bold above the input element.
description	string	Text that gives more detail about the requirements for the input.
optional	boolean	Marks the input as optional	false
disabled	boolean	Disabled the input	false
onChange	function	The event handler function for the 'onchange' event. Accepts the change event object as its argument and returns nothing.
onBlur	function	The event handler function for the 'onblur' event. Accepts the focus event object as its argument and returns nothing.
placeholder	string	The placeholder text shown in the input field before the user begins typing.
errorMessage	string	Text that gives more detail about the requirements for the input.	'This input needs your attention'
successMessage	string	Text that indicates that the requirements for the input are met.	'Success'
state	'none', 'valid', 'error'	Describes the state of the TextInput element before and after the input has been validated	'none'
value	string	Sets the HTML value attribute.	''
className	string	Adds a className to the class attribute.	''
type	'email', 'password', 'search', 'text', 'url', 'tel', 'number'	Sets type for TextInput	'text'
darkMode	boolean	Determines whether or not the component will appear in dark mode.	false
sizeVariant	'xsmall', 'small', 'default', 'large',	Sets the side padding, text size, and input height.	default
baseFontSize	14, 16	Determines the base font-size of the component if the sizeVariant prop is set to default	14
...	native input attributes	Any other props will be spread on the root input element

Special Case: Aria Labels

Either label or aria-labelledby must be provided a string, or there will be a console error. This is to ensure that screenreaders have a description for what the Text Input does.

Test Harnesses

getTestUtils()

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

Usage

import TextInput, { getTestUtils } from '@leafygreen-ui/text-input';

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

Single TextInput

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

...

test('text-input', () => {
  render(<TextInput label="label" value="text input" />);
  const { getInput, getInputValue } = getTestUtils();

  expect(getInput()).toBeInTheDocument();
  expect(getInputValue()).toBe('text input');
});

Multiple TextInput's

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

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

...

test('text-input', () => {
  render(
    <>
      <TextInput data-lgid="text-input-1" label="label 1" />
      <TextInput data-lgid="text-input-2" label="label 2" value="text input" />
    </>,
  );
  const utilsOne = getTestUtils('text-input-1'); // data-lgid
  const utilsTwo = getTestUtils('text-input-2'); // data-lgid

  // First TextInput
  expect(utilsOne.getInput()).toBeInTheDocument();
  expect(utilsOne.getInputValue()).toBe('');

  // Second TextInput
  expect(utilsTwo.getInput()).toBeInTheDocument();
  expect(utilsTwo.getInputValue()).toBe('text input');
});

TextInput with other LG form elements

import { render } from '@testing-library/react';
import Toggle, { getTestUtils as getToggleTestUtils } from '@leafygreen-ui/toggle';
import TextInput, { getTestUtils as getTextInputTestUtils } from '@leafygreen-ui/text-input';
import TextArea, { getTestUtils as getTextAreaTestUtils } from '@leafygreen-ui/text-area';

...

test('Form', () => {
  render(
    <Form>
      <Toggle aria-label="Toggle label" />
      <TextInput label="TextInput label" />
      <TextArea label="TextArea label" />
    </Form>,
  );
  const toggleInputUtils = getToggleTestUtils();
  const textInputUtils = getTextInputTestUtils();
  const textAreaUtils = getTextAreaTestUtils();

  // LG Toggle
  expect(toggleInputUtils.getInput()).toBeInTheDocument();
  expect(toggleInputUtils.getInputValue()).toBe('false');

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

  // LG TextArea
  expect(textAreaUtils.getInput()).toBeInTheDocument();
  expect(textAreaUtils.getInputValue()).toBe('');
});

Test Utils

const {
  getInput,
  getLabel,
  getDescription,
  getErrorMessage,
  getInputValue,
  isDisabled,
  isValid,
  isError,
  isOptional,
} = 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
getInputValue	Returns the input value	string
isDisabled	Returns whether the input is disabled	boolean
isValid	Returns whether the input state is valid	boolean
isError	Returns whether the input state is error	boolean
isOptional	Returns whether the input is optional	boolean