Stepper

Use a stepper to increase or decrease a value, like changing the quantity from 1 to 2.

Basic Stepper

import {
  reactExtension,
  Stepper,
} from '@shopify/ui-extensions-react/checkout';

export default reactExtension(
  'purchase.checkout.block.render',
  () => <Extension />,
);

function Extension() {
  return <Stepper label="Quantity" value={1} />;
}

import {extension, Stepper} from '@shopify/ui-extensions/checkout';

export default extension('purchase.checkout.block.render', (root) => {
  const stepper = root.createComponent(Stepper, {
    label: 'Quantity',
    value: 1,
  });

  root.appendChild(stepper);
});

StepperProps

accessibilityDescription

A detailed description for screen readers.

disabled

Whether the field can be modified.

error

Indicate an error to the user. The field will be given a specific stylistic treatment to communicate problems that have to be resolved immediately.

label

Content to use as the field label. This value is also used as the placeholder when the field is empty.

icon

An icon to render at the start of the field.

id

A unique identifier for the field. When no `id` is set, a globally unique value will be used instead.

max

The highest decimal or integer to be accepted for the stepper field. When used with `step` the value will round down to the max number. Note: a buyer will still be able to use the keyboard to input a number higher than the max. It is up to the developer to add appropriate validation.

min

The lowest decimal or integer to be accepted for the stepper field. When used with `step` the value will round up to the min number. Note: a buyer will still be able to use the keyboard to input a number lower than the min. It is up to the developer to add appropriate validation.

name

An identifier for the field that is unique within the nearest containing `Form` component.

prefix

Text content to render before the value.

readonly

Whether the field is read-only.

required

Whether the field needs a value. This requirement adds semantic value to the field, but it will not cause an error to appear automatically. If you want to present an error when this field is empty, you can do so with the `error` prop.

step

The amount the value can increase or decrease by. This can be an integer or decimal. If a `max` or `min` is specified with `step` when increasing/decreasing the value via the stepper buttons the final value will always round to the `max` or `min` rather than the closest valid amount.

value

The current value for the field. If omitted, the field will be empty. You should update this value in response to the `onChange` callback.

onFocus

Callback when input is focused.

onBlur

Callback when focus is removed.

onChange

Callback when the buyer has **finished editing** a field. Unlike `onChange` callbacks you may be familiar with from Polaris or other React component libraries, this callback is **not** run on every change to the input. Text fields are “partially controlled” components, which means that while the buyer edits the field, its state is controlled by the component. Once the buyer has signalled that they have finished editing the field (typically, by blurring the field), `onChange` is called if the input actually changed from the most recent `value` property. At that point, you are expected to store this “committed value” in state, and reflect it in the text field’s `value` property. This state management model is important given how UI Extensions are rendered. UI Extension components run on a separate thread from the UI, so they can’t respond to input synchronously. A pattern popularized by [controlled React components](https://reactjs.org/docs/forms.html#controlled-components) is to have the component be the source of truth for the input `value`, and update the `value` on every user input. The delay in responding to events from a UI extension is only a few milliseconds, but attempting to strictly store state with this delay can cause issues if a user types quickly, or if the buyer is using a lower-powered device. Having the UI thread take ownership for “in progress” input, and only synchronizing when the user is finished with a field, avoids this risk. It can still sometimes be useful to be notified when the user makes any input in the field. If you need this capability, you can use the `onInput` prop. However, never use that property to create tightly controlled state for the `value`. This callback is called with the current value of the field. If the value of a field is the same as the current `value` prop provided to the field, the `onChange` callback will not be run.

onInput

Callback when the user makes any changes in the field. As noted in the documentation for `onChange`, you **must not** use this to update `state` — use the `onChange` callback for that purpose. Use the `onInput` prop when you need to do something as soon as the buyer makes a change, like clearing validation errors that apply to the field as soon as the user begins making the necessary adjustments. This callback is called with the current value of the field.

IconSource