NumberField

A number field allows a user to enter a number, and increment or decrement the value using stepper buttons.

Example#

import {NumberField, Label, Group, Input, Button} from 'react-aria-components';

<NumberField defaultValue={1024} minValue={0}>
  <Label>Width</Label>
  <Group>
    <Button slot="decrement">-</Button>
    <Input />
    <Button slot="increment">+</Button>
  </Group>
</NumberField>

import {
  Button,
  Group,
  Input,
  Label,
  NumberField
} from 'react-aria-components';

<NumberField defaultValue={1024} minValue={0}>
  <Label>Width</Label>
  <Group>
    <Button slot="decrement">-</Button>
    <Input />
    <Button slot="increment">+</Button>
  </Group>
</NumberField>

import {
  Button,
  Group,
  Input,
  Label,
  NumberField
} from 'react-aria-components';

<NumberField
  defaultValue={1024}
  minValue={0}
>
  <Label>Width</Label>
  <Group>
    <Button slot="decrement">
      -
    </Button>
    <Input />
    <Button slot="increment">
      +
    </Button>
  </Group>
</NumberField>

.react-aria-NumberField {
  --field-border: var(--spectrum-alias-border-color);
  --field-border-disabled: var(--spectrum-alias-border-color-disabled);
  --field-background: var(--spectrum-global-color-gray-50);
  --text-color: var(--spectrum-alias-text-color);
  --text-color-disabled: var(--spectrum-alias-text-color-disabled);
  --focus-ring-color: slateblue;
  --invalid-color: var(--spectrum-global-color-red-600);

  margin-bottom: 8px;

  .react-aria-Group {
    display: flex;
    width: fit-content;
    border-radius: 4px;
  }

  .react-aria-Button {
    background: var(--field-background);
    border: 1px solid var(--field-border);
    border-radius: 4px;
    color: var(--text-color);
    appearance: none;
    vertical-align: middle;
    font-size: 1.4rem;
    width: 2.3rem;
    text-align: center;
    margin: 0;
    padding: 0;
    outline: none;

    &[slot=decrement] {
      border-start-end-radius: 0;
      border-end-end-radius: 0;
    }

    &[slot=increment] {
      border-start-start-radius: 0;
      border-end-start-radius: 0;
    }

    &[data-pressed] {
      box-shadow: inset 0 1px 2px rgb(0 0 0 / 0.1);
      background: var(--spectrum-global-color-gray-75);
    }

    &:disabled {
      border-color: var(--field-border-disabled);
      color: var(--text-color-disabled);
    }
  }

  .react-aria-Input {
    background: var(--field-background);
    border: 1px solid var(--field-border);
    border-radius: 0;
    color: var(--text-color);
    margin: 0 -1px;
    z-index: 1;
    font-size: 1rem;
    padding: 0.429rem 0.571rem;
    outline: none;
    width: 6rem;
    flex: 1;

    &:disabled {
      border-color: var(--field-border-disabled);
    }
  }

  &:focus-within {
    .react-aria-Input,
    .react-aria-Button {
      border-color: var(--focus-ring-color);
    }
  }

  [slot=description] {
    font-size: 12px;
  }

  [slot=errorMessage] {
    font-size: 12px;
    color: var(--invalid-color);
  }
}

@media (forced-colors: active) {
  .react-aria-NumberField {
    --field-border: ButtonBorder;
    --field-border-disabled: GrayText;
    --field-background: Field;
    --text-color: FieldText;
    --text-color-disabled: GrayText;
    --focus-ring-color: Highlight;
    --invalid-color: LinkText;
  }
}

.react-aria-NumberField {
  --field-border: var(--spectrum-alias-border-color);
  --field-border-disabled: var(--spectrum-alias-border-color-disabled);
  --field-background: var(--spectrum-global-color-gray-50);
  --text-color: var(--spectrum-alias-text-color);
  --text-color-disabled: var(--spectrum-alias-text-color-disabled);
  --focus-ring-color: slateblue;
  --invalid-color: var(--spectrum-global-color-red-600);

  margin-bottom: 8px;

  .react-aria-Group {
    display: flex;
    width: fit-content;
    border-radius: 4px;
  }

  .react-aria-Button {
    background: var(--field-background);
    border: 1px solid var(--field-border);
    border-radius: 4px;
    color: var(--text-color);
    appearance: none;
    vertical-align: middle;
    font-size: 1.4rem;
    width: 2.3rem;
    text-align: center;
    margin: 0;
    padding: 0;
    outline: none;

    &[slot=decrement] {
      border-start-end-radius: 0;
      border-end-end-radius: 0;
    }

    &[slot=increment] {
      border-start-start-radius: 0;
      border-end-start-radius: 0;
    }

    &[data-pressed] {
      box-shadow: inset 0 1px 2px rgb(0 0 0 / 0.1);
      background: var(--spectrum-global-color-gray-75);
    }

    &:disabled {
      border-color: var(--field-border-disabled);
      color: var(--text-color-disabled);
    }
  }

  .react-aria-Input {
    background: var(--field-background);
    border: 1px solid var(--field-border);
    border-radius: 0;
    color: var(--text-color);
    margin: 0 -1px;
    z-index: 1;
    font-size: 1rem;
    padding: 0.429rem 0.571rem;
    outline: none;
    width: 6rem;
    flex: 1;

    &:disabled {
      border-color: var(--field-border-disabled);
    }
  }

  &:focus-within {
    .react-aria-Input,
    .react-aria-Button {
      border-color: var(--focus-ring-color);
    }
  }

  [slot=description] {
    font-size: 12px;
  }

  [slot=errorMessage] {
    font-size: 12px;
    color: var(--invalid-color);
  }
}

@media (forced-colors: active) {
  .react-aria-NumberField {
    --field-border: ButtonBorder;
    --field-border-disabled: GrayText;
    --field-background: Field;
    --text-color: FieldText;
    --text-color-disabled: GrayText;
    --focus-ring-color: Highlight;
    --invalid-color: LinkText;
  }
}

.react-aria-NumberField {
  --field-border: var(--spectrum-alias-border-color);
  --field-border-disabled: var(--spectrum-alias-border-color-disabled);
  --field-background: var(--spectrum-global-color-gray-50);
  --text-color: var(--spectrum-alias-text-color);
  --text-color-disabled: var(--spectrum-alias-text-color-disabled);
  --focus-ring-color: slateblue;
  --invalid-color: var(--spectrum-global-color-red-600);

  margin-bottom: 8px;

  .react-aria-Group {
    display: flex;
    width: fit-content;
    border-radius: 4px;
  }

  .react-aria-Button {
    background: var(--field-background);
    border: 1px solid var(--field-border);
    border-radius: 4px;
    color: var(--text-color);
    appearance: none;
    vertical-align: middle;
    font-size: 1.4rem;
    width: 2.3rem;
    text-align: center;
    margin: 0;
    padding: 0;
    outline: none;

    &[slot=decrement] {
      border-start-end-radius: 0;
      border-end-end-radius: 0;
    }

    &[slot=increment] {
      border-start-start-radius: 0;
      border-end-start-radius: 0;
    }

    &[data-pressed] {
      box-shadow: inset 0 1px 2px rgb(0 0 0 / 0.1);
      background: var(--spectrum-global-color-gray-75);
    }

    &:disabled {
      border-color: var(--field-border-disabled);
      color: var(--text-color-disabled);
    }
  }

  .react-aria-Input {
    background: var(--field-background);
    border: 1px solid var(--field-border);
    border-radius: 0;
    color: var(--text-color);
    margin: 0 -1px;
    z-index: 1;
    font-size: 1rem;
    padding: 0.429rem 0.571rem;
    outline: none;
    width: 6rem;
    flex: 1;

    &:disabled {
      border-color: var(--field-border-disabled);
    }
  }

  &:focus-within {
    .react-aria-Input,
    .react-aria-Button {
      border-color: var(--focus-ring-color);
    }
  }

  [slot=description] {
    font-size: 12px;
  }

  [slot=errorMessage] {
    font-size: 12px;
    color: var(--invalid-color);
  }
}

@media (forced-colors: active) {
  .react-aria-NumberField {
    --field-border: ButtonBorder;
    --field-border-disabled: GrayText;
    --field-background: Field;
    --text-color: FieldText;
    --text-color-disabled: GrayText;
    --focus-ring-color: Highlight;
    --invalid-color: LinkText;
  }
}

Features#

Number fields can be built with <input type="number">, but the behavior is very inconsistent across browsers and platforms, it supports limited localized formatting options, and it is challenging to style the stepper buttons. NumberField helps achieve accessible number fields that support internationalized formatting options and can be styled as needed.

• Customizable formatting – Support for internationalized number formatting and parsing including decimals, percentages, currency values, and units. Multiple currency formats are supported, including symbol, code, and name in standard or accounting notation.
• International – Support for the Latin, Arabic, and Han positional decimal numbering systems in over 30 locales. The numbering system is automatically detected from user input, and input method editors such as Pinyin are supported.
• Validation – Keyboard input is validated as the user types so that only numeric input is accepted, according to the locale and numbering system. Values are automatically rounded and clamped according to configurable decimal, minimum, maximum, and step values.
• Mobile friendly – An appropriate software keyboard is automatically selected based on the allowed values for ease of use.
• Accessible – Follows the spinbutton ARIA pattern, with support for arrow keys, scroll wheel, and stepper buttons to increment and decrement the value. Extensively tested across many devices and assistive technologies to ensure announcements and behaviors are consistent.

Read our blog post for more details about the interactions and internationalization support implemented by NumberField.

Anatomy#

Number fields consist of an input element that shows the current value and allows the user to type a new value, optional stepper buttons to increment and decrement the value, a group containing the input and stepper buttons, and a label.

NumberField also supports optional description and error message elements, which can be used to provide more context about the field, and any validation messages. These are linked with the input via the aria-describedby attribute.

If there is no visual label, an aria-label or aria-labelledby prop must be passed instead to identify the element to screen readers.

Composed components#

A NumberField uses the following components, which may also be used standalone or reused in other components.

Props#

NumberField#

Label#

A <Label> accepts all HTML attributes.

Group#

A <Group> accepts all HTML attributes.

Input#

An <Input> accepts all props supported by the <input> HTML element.

Button#

A <Button> accepts its contents as children. Other props such as onPress and isDisabled will be set by the NumberField.

Styling#

React Aria components can be styled in many ways, including using CSS classes, inline styles, utility classes (e.g. Tailwind), CSS-in-JS (e.g. Styled Components), etc. By default, all components include a builtin className attribute which can be targeted using CSS selectors. These follow the react-aria-ComponentName naming convention.

.react-aria-NumberField {
  /* ... */
}

.react-aria-NumberField {
  /* ... */
}

.react-aria-NumberField {
  /* ... */
}

A custom className can also be specified on any component. This overrides the default className provided by React Aria with your own.

<NumberField className="my-number-field">
  {/* ... */}
</NumberField>

<NumberField className="my-number-field">
  {/* ... */}
</NumberField>

<NumberField className="my-number-field">
  {/* ... */}
</NumberField>

In addition, some components support multiple UI states (e.g. focused, placeholder, readonly, etc.). React Aria components expose states using DOM attributes, which you can target in CSS selectors. These are ARIA attributes wherever possible, or data attributes when a relevant ARIA attribute does not exist. For example:

.react-aria-Button[data-pressed] {
  /* ... */
}

.react-aria-Button[data-pressed] {
  /* ... */
}

.react-aria-Button[data-pressed] {
  /* ... */
}

The className and style props also accept functions which receive states for styling. This lets you dynamically determine the classes or styles to apply, which is useful when using utility CSS libraries like Tailwind.

<Button
  className={({ isPressed }) => isPressed ? 'bg-gray-700' : 'bg-gray-600'}
/>

<Button
  className={({ isPressed }) =>
    isPressed ? 'bg-gray-700' : 'bg-gray-600'}
/>

<Button
  className={(
    { isPressed }
  ) =>
    isPressed
      ? 'bg-gray-700'
      : 'bg-gray-600'}
/>

The states, selectors, and render props for each component used in a NumberField are documented below.

NumberField#

A NumberField can be targeted with the .react-aria-NumberField CSS selector, or by overriding with a custom className. It supports the following states:

Label#

A Label can be targeted with the .react-aria-Label CSS selector, or by overriding with a custom className.

Group#

A Group can be targeted with the .react-aria-Group selector, or by overriding with a custom className. It supports the following states:

Input#

An Input can be targeted with the .react-aria-Input CSS selector, or by overriding with a custom className. It supports the following states:

Button#

A Button can be targeted with the .react-aria-Button CSS selector, or by overriding with a custom className. Within a NumberField, there are two slots, which can be targeted with the [slot=increment] and [slot=decrement] CSS selectors. Buttons support the following states:

Text#

The help text elements within a NumberField can be targeted with the [slot=description] and [slot=errorMessage] CSS selectors, or by adding a custom className.

Reusable wrappers#

If you will use a NumberField in multiple places in your app, you can wrap all of the pieces into a reusable component. This way, the DOM structure, styling code, and other logic are defined in a single place and reused everywhere to ensure consistency.

This example wraps NumberField and all of its children together into a single component which accepts a label prop, which is passed to the right place. It also shows how to use the description and errorMessage slots to render help text (see below for details).

import type {NumberFieldProps} from 'react-aria-components';
import {Text} from 'react-aria-components';

interface MyNumberFieldProps extends NumberFieldProps {
  label?: string;
  description?: string;
  errorMessage?: string;
}

function MyNumberField(
  { label, description, errorMessage, ...props }: MyNumberFieldProps
) {
  return (
    <NumberField {...props}>
      <Label>{label}</Label>
      <Group>
        <Button slot="decrement">-</Button>
        <Input />
        <Button slot="increment">+</Button>
      </Group>
      {description && <Text slot="description">{description}</Text>}
      {errorMessage && <Text slot="errorMessage">{errorMessage}</Text>}
    </NumberField>
  );
}

<MyNumberField label="Cookies" />

import type {NumberFieldProps} from 'react-aria-components';
import {Text} from 'react-aria-components';

interface MyNumberFieldProps extends NumberFieldProps {
  label?: string;
  description?: string;
  errorMessage?: string;
}

function MyNumberField(
  { label, description, errorMessage, ...props }:
    MyNumberFieldProps
) {
  return (
    <NumberField {...props}>
      <Label>{label}</Label>
      <Group>
        <Button slot="decrement">-</Button>
        <Input />
        <Button slot="increment">+</Button>
      </Group>
      {description && (
        <Text slot="description">{description}</Text>
      )}
      {errorMessage && (
        <Text slot="errorMessage">{errorMessage}</Text>
      )}
    </NumberField>
  );
}

<MyNumberField label="Cookies" />

import type {NumberFieldProps} from 'react-aria-components';
import {Text} from 'react-aria-components';

interface MyNumberFieldProps
  extends
    NumberFieldProps {
  label?: string;
  description?: string;
  errorMessage?: string;
}

function MyNumberField(
  {
    label,
    description,
    errorMessage,
    ...props
  }: MyNumberFieldProps
) {
  return (
    <NumberField
      {...props}
    >
      <Label>
        {label}
      </Label>
      <Group>
        <Button slot="decrement">
          -
        </Button>
        <Input />
        <Button slot="increment">
          +
        </Button>
      </Group>
      {description && (
        <Text slot="description">
          {description}
        </Text>
      )}
      {errorMessage && (
        <Text slot="errorMessage">
          {errorMessage}
        </Text>
      )}
    </NumberField>
  );
}

<MyNumberField label="Cookies" />

Usage#

The following examples show how to use the MyNumberField component created in the above example.

Controlled#

By default, NumberField is uncontrolled. However, when using the value prop, it becomes controlled. This allows you to store the current value in your own state, and use it elsewhere.

The onChange event is triggered whenever the number value updates. This happens when the user types a value and blurs the input, or when incrementing or decrementing the value. It does not happen as the user types because partial input may not be parseable to a valid number.

function Example() {
  let [value, setValue] = React.useState(6);

  return (
    <>
      <MyNumberField
        label="Controlled value"
        value={value}
        onChange={setValue} />
      <div>Current value prop: {value}</div>
    </>
  );
}

function Example() {
  let [value, setValue] = React.useState(6);

  return (
    <>
      <MyNumberField
        label="Controlled value"
        value={value}
        onChange={setValue} />
      <div>Current value prop: {value}</div>
    </>
  );
}

function Example() {
  let [value, setValue] =
    React.useState(6);

  return (
    <>
      <MyNumberField
        label="Controlled value"
        value={value}
        onChange={setValue}
      />
      <div>
        Current value
        prop: {value}
      </div>
    </>
  );
}

Decimals#

The default formatting style for NumberField is decimal, but you can configure various aspects via the formatOptions prop. All options supported by Intl.NumberFormat are supported, including configuration of minimum and maximum fraction digits, sign display, grouping separators, etc. Currently only standard notation is supported, though scientific, engineering, and compact notation may be supported in the future.

The following example uses the signDisplay option to include the plus sign for positive numbers, for example to display an offset from some value. In addition, it always displays a minimum of 1 digit after the decimal point, and allows up to 2 fraction digits. If the user enters more than 2 fraction digits, the result will be rounded.

<MyNumberField
  label="Adjust exposure"
  defaultValue={0}
  formatOptions={{
    signDisplay: 'exceptZero',
    minimumFractionDigits: 1,
    maximumFractionDigits: 2
  }} />

<MyNumberField
  label="Adjust exposure"
  defaultValue={0}
  formatOptions={{
    signDisplay: 'exceptZero',
    minimumFractionDigits: 1,
    maximumFractionDigits: 2
  }} />

<MyNumberField
  label="Adjust exposure"
  defaultValue={0}
  formatOptions={{
    signDisplay:
      'exceptZero',
    minimumFractionDigits:
      1,
    maximumFractionDigits:
      2
  }}
/>

Percentages#

The style: 'percent' option can be passed to the formatOptions prop to treat the value as a percentage. In this mode, the value is multiplied by 100 before it is displayed, i.e. 0.45 is displayed as 45%. The reverse is also true: when the user enters a value, the onChange event will be triggered with the entered value divided by 100. When the percent option is enabled, the default step automatically changes to 0.01 such that incrementing and decrementing occurs by 1%. This can be overridden with the step prop. See below for details.

<MyNumberField
  label="Sales tax"
  defaultValue={0.05}
  formatOptions={{
    style: 'percent'
  }} />

<MyNumberField
  label="Sales tax"
  defaultValue={0.05}
  formatOptions={{
    style: 'percent'
  }} />

<MyNumberField
  label="Sales tax"
  defaultValue={0.05}
  formatOptions={{
    style: 'percent'
  }} />

Currency values#

The style: 'currency' option can be passed to the formatOptions prop to treat the value as a currency value. The currency option must also be passed to set the currency code (e.g. USD) to use. In addition, the currencyDisplay option can be used to choose whether to display the currency symbol, currency code, or currency name. Finally, the currencySign option can be set to accounting to use accounting notation for negative numbers, which uses parentheses rather than a minus sign in some locales.

If you need to allow the user to change the currency, you should include a separate dropdown next to the number field. The number field itself will not determine the currency from the user input.

<MyNumberField
  label="Transaction amount"
  defaultValue={45}
  formatOptions={{
    style: 'currency',
    currency: 'EUR',
    currencyDisplay: 'code',
    currencySign: 'accounting'
  }} />

<MyNumberField
  label="Transaction amount"
  defaultValue={45}
  formatOptions={{
    style: 'currency',
    currency: 'EUR',
    currencyDisplay: 'code',
    currencySign: 'accounting'
  }} />

<MyNumberField
  label="Transaction amount"
  defaultValue={45}
  formatOptions={{
    style: 'currency',
    currency: 'EUR',
    currencyDisplay:
      'code',
    currencySign:
      'accounting'
  }}
/>

Units#

The style: 'unit' option can be passed to the formatOptions prop to format the value with a unit of measurement. The unit option must also be passed to set which unit to use (e.g. inch). In addition, the unitDisplay option can be used to choose whether to display the unit in long, short, or narrow format.

If you need to allow the user to change the unit, you should include a separate dropdown next to the number field. The number field itself will not determine the unit from the user input.

Note: the unit style is not currently supported in Safari. A polyfill may be necessary.

<MyNumberField
  label="Package width"
  defaultValue={4}
  formatOptions={{
    style: 'unit',
    unit: 'inch',
    unitDisplay: 'long'
  }} />

<MyNumberField
  label="Package width"
  defaultValue={4}
  formatOptions={{
    style: 'unit',
    unit: 'inch',
    unitDisplay: 'long'
  }} />

<MyNumberField
  label="Package width"
  defaultValue={4}
  formatOptions={{
    style: 'unit',
    unit: 'inch',
    unitDisplay: 'long'
  }} />

Minimum and maximum values#

The minValue and maxValue props can be used to limit the entered value to a specific range. The value will be clamped when the user blurs the input field. In addition, the increment and decrement buttons will be disabled when the value is within one step value from the bounds (see below for info about steps). Ranges can be open ended by only providing either minValue or maxValue rather than both.

If a valid range is known ahead of time, it is a good idea to provide it to NumberField so it can optimize the experience. For example, when the minimum value is greater than or equal to zero, it is possible to use a numeric keyboard on iOS rather than a full text keyboard (necessary to enter a minus sign).

<MyNumberField
  label="Enter your age"
  minValue={0} />

<MyNumberField
  label="Enter your age"
  minValue={0} />

<MyNumberField
  label="Enter your age"
  minValue={0} />

Step values#

The step prop can be used to snap the value to certain increments. If there is a minValue defined, the steps are calculated starting from the minimum. For example, if minValue={2}, and step={3}, the valid step values would be 2, 5, 8, 11, etc. If no minValue is defined, the steps are calculated starting from zero and extending in both directions. In other words, such that the values are evenly divisible by the step. If no step is defined, any decimal value may be typed, but incrementing and decrementing snaps the value to an integer.

If the user types a value that is between two steps and blurs the input, the value will be snapped to the nearest step. When incrementing or decrementing, the value is snapped to the nearest step that is higher or lower, respectively. When incrementing or decrementing from an empty field, the value starts at the minValue or maxValue, respectively, if defined. Otherwise, the value starts from 0.

<MyNumberField
  label="Step"
  step={10} />
<MyNumberField
  label="Step + minValue"
  minValue={2}
  step={3} />
<MyNumberField
  label="Step + minValue + maxValue"
  minValue={2}
  maxValue={21}
  step={3} />

<MyNumberField
  label="Step"
  step={10} />
<MyNumberField
  label="Step + minValue"
  minValue={2}
  step={3} />
<MyNumberField
  label="Step + minValue + maxValue"
  minValue={2}
  maxValue={21}
  step={3} />

<MyNumberField
  label="Step"
  step={10}
/>
<MyNumberField
  label="Step + minValue"
  minValue={2}
  step={3}
/>
<MyNumberField
  label="Step + minValue + maxValue"
  minValue={2}
  maxValue={21}
  step={3}
/>

Disabled and read only#

The isDisabled and isReadOnly props can be used prevent the user from editing the value of the number field. The difference is that isReadOnly still allows the input to be focused, while isDisabled prevents all user interaction.

<MyNumberField label="Disabled" isDisabled value={25} />
<MyNumberField label="Read only" isReadOnly value={32} />

<MyNumberField label="Disabled" isDisabled value={25} />
<MyNumberField label="Read only" isReadOnly value={32} />

<MyNumberField
  label="Disabled"
  isDisabled
  value={25}
/>
<MyNumberField
  label="Read only"
  isReadOnly
  value={32}
/>

Help text#

The description slot can be used to associate additional help text with a number field. Additionally, the errorMessage slot can be used to help the user fix a validation error. It should be combined with the validationState prop to semantically mark the number field as invalid for assistive technologies.

function Example() {
  let [value, setValue] = React.useState(1);
  let isValid = React.useMemo(() => value > 0 || Number.isNaN(value), [value]);

  return (
    <MyNumberField
      validationState={Number.isNaN(value)
        ? undefined
        : (isValid ? 'valid' : 'invalid')}
      value={value}
      onChange={setValue}
      label="Positive numbers only"
      description={isValid ? 'Enter a positive number.' : undefined}
      errorMessage={isValid
        ? undefined
        : value === 0
        ? 'Is zero positive?'
        : 'Positive numbers are bigger than 0.'}
    />
  );
}

function Example() {
  let [value, setValue] = React.useState(1);
  let isValid = React.useMemo(
    () => value > 0 || Number.isNaN(value),
    [value]
  );

  return (
    <MyNumberField
      validationState={Number.isNaN(value)
        ? undefined
        : (isValid ? 'valid' : 'invalid')}
      value={value}
      onChange={setValue}
      label="Positive numbers only"
      description={isValid
        ? 'Enter a positive number.'
        : undefined}
      errorMessage={isValid
        ? undefined
        : value === 0
        ? 'Is zero positive?'
        : 'Positive numbers are bigger than 0.'}
    />
  );
}

function Example() {
  let [value, setValue] =
    React.useState(1);
  let isValid = React
    .useMemo(
      () =>
        value > 0 ||
        Number.isNaN(
          value
        ),
      [value]
    );

  return (
    <MyNumberField
      validationState={Number
          .isNaN(value)
        ? undefined
        : (isValid
          ? 'valid'
          : 'invalid')}
      value={value}
      onChange={setValue}
      label="Positive numbers only"
      description={isValid
        ? 'Enter a positive number.'
        : undefined}
      errorMessage={isValid
        ? undefined
        : value === 0
        ? 'Is zero positive?'
        : 'Positive numbers are bigger than 0.'}
    />
  );
}

HTML forms#

NumberField supports the name prop for integration with HTML forms. The value will be submitted to the server as a raw number (e.g. 45), not as a locale-dependent formatted string (e.g. "$45.00").

<MyNumberField
  label="Transaction amount"
  name="amount"
  defaultValue={45}
  formatOptions={{
    style: 'currency',
    currency: 'USD'
  }} />

<MyNumberField
  label="Transaction amount"
  name="amount"
  defaultValue={45}
  formatOptions={{
    style: 'currency',
    currency: 'USD'
  }} />

<MyNumberField
  label="Transaction amount"
  name="amount"
  defaultValue={45}
  formatOptions={{
    style: 'currency',
    currency: 'USD'
  }}
/>

Advanced customization#

Composition#

If you need to customize one of the components within a NumberField, such as Label or Input, in many cases you can create a wrapper component. This lets you customize the props passed to the component.

function MyInput(props) {
  return <Input {...props} className="my-input" />
}

function MyInput(props) {
  return <Input {...props} className="my-input" />
}

function MyInput(props) {
  return (
    <Input
      {...props}
      className="my-input"
    />
  );
}

Hooks#

If you need to customize things even further, such as accessing internal state or customizing DOM structure, you can drop down to the lower level Hook-based API. See useNumberField for more details.