useBuyerJourneyIntercept

hook

UseBuyerJourneyInterceptGeneratedType

Installs a function for intercepting and preventing progress on checkout. To block checkout progress, you must set the [block_progress](/docs/api/checkout-ui-extensions/configuration#block-progress) capability in your extension's configuration. If you do, then you're expected to inform the buyer why navigation was blocked, either by passing validation errors to the checkout UI or rendering the errors in your extension.

• interceptor

  Interceptor

void

export function useBuyerJourneyIntercept<
  Target extends RenderExtensionTarget = RenderExtensionTarget,
>(interceptor: Interceptor): void {
  const api = useApi<Target>();

  if (!('buyerJourney' in api)) {
    throw new ExtensionHasNoMethodError('buyerJourney', api.extension.target);
  }

  const interceptorRef = useRef(interceptor);
  interceptorRef.current = interceptor;

  return useEffect(() => {
    const teardownPromise = api.buyerJourney.intercept((interceptorProps) =>
      interceptorRef.current(interceptorProps),
    );

    return () => {
      teardownPromise.then((teardown) => teardown()).catch(() => {});
    };
  }, [api.buyerJourney]);
}

Interceptor

A function for intercepting and preventing navigation on checkout. You can block navigation by returning an object with `{behavior: 'block', reason: InvalidResultReason.InvalidExtensionState, errors?: ValidationErrors[]}`. If you do, then you're expected to also update some part of your UI to reflect the reason why navigation was blocked, either by targeting checkout UI fields, passing errors to the page level or rendering the errors in your extension.

(
  interceptorProps: InterceptorProps,
) => InterceptorRequest | Promise<InterceptorRequest>

InterceptorProps

• canBlockProgress

  Whether the interceptor has the capability to block a buyer's progress through checkout. This ability might be granted by a merchant in differing checkout contexts.

  boolean

export interface InterceptorProps {
  /**
   * Whether the interceptor has the capability to block a buyer's progress through
   * checkout. This ability might be granted by a merchant in differing checkout contexts.
   */
  canBlockProgress: boolean;
}

InterceptorRequest

InterceptorRequestAllow | InterceptorRequestBlock

InterceptorRequestAllow

• behavior

  Indicates that the interceptor will allow the buyer's journey to continue.

  "allow"

• perform

  This callback is called when all interceptors finish. We recommend setting errors or reasons for blocking at this stage, so that all the errors in the UI show up at once.

  (result: InterceptorResult) => void | Promise<void>

interface InterceptorRequestAllow {
  /**
   * Indicates that the interceptor will allow the buyer's journey to continue.
   */
  behavior: 'allow';

  /**
   * This callback is called when all interceptors finish. We recommend
   * setting errors or reasons for blocking at this stage, so that all the errors in
   * the UI show up at once.
   * @param result InterceptorResult with behavior as either 'allow' or 'block'
   */
  perform?(result: InterceptorResult): void | Promise<void>;
}

InterceptorResult

InterceptorResultAllow | InterceptorResultBlock

InterceptorResultAllow

• behavior

  Indicates that the buyer was allowed to progress through checkout.

  "allow"

interface InterceptorResultAllow {
  /**
   * Indicates that the buyer was allowed to progress through checkout.
   */
  behavior: 'allow';
}

InterceptorResultBlock

• behavior

  Indicates that some part of the checkout UI intercepted and prevented the buyer’s progress. The buyer typically needs to take some action to resolve this issue and to move on to the next step.

  "block"

interface InterceptorResultBlock {
  /**
   * Indicates that some part of the checkout UI intercepted and prevented
   * the buyer’s progress. The buyer typically needs to take some action
   * to resolve this issue and to move on to the next step.
   */
  behavior: 'block';
}

InterceptorRequestBlock

• behavior

  Indicates that the interceptor will block the buyer's journey from continuing.

  "block"

• reason

  The reason for blocking the interceptor request. This value isn't presented to the buyer, so it doesn't need to be localized. The value is used only for Shopify’s own internal debugging and metrics.

  string

• errors

  Used to pass errors to the checkout UI, outside your extension's UI boundaries.

  ValidationError[]

• perform

  This callback is called when all interceptors finish. We recommend setting errors or reasons for blocking at this stage, so that all the errors in the UI show up at once.

  (result: InterceptorResult) => void | Promise<void>

interface InterceptorRequestBlock {
  /**
   * Indicates that the interceptor will block the buyer's journey from continuing.
   */
  behavior: 'block';

  /**
   * The reason for blocking the interceptor request. This value isn't presented to
   * the buyer, so it doesn't need to be localized. The value is used only for Shopify’s
   * own internal debugging and metrics.
   */
  reason: string;

  /**
   * Used to pass errors to the checkout UI, outside your extension's UI boundaries.
   */
  errors?: ValidationError[];

  /**
   * This callback is called when all interceptors finish. We recommend
   * setting errors or reasons for blocking at this stage, so that all the errors in
   * the UI show up at once.
   * @param result InterceptorResult with behavior as either 'allow' or 'block'
   */
  perform?(result: InterceptorResult): void | Promise<void>;
}

ValidationError

• message

  Error message to be displayed to the buyer.

  string

• target

  The checkout UI field that the error is associated with. Example: `$.cart.deliveryGroups[0].deliveryAddress.countryCode` See the [supported targets](/docs/api/functions/reference/cart-checkout-validation/graphql#supported-targets) for more information.

  string

export interface ValidationError {
  /**
   * Error message to be displayed to the buyer.
   */
  message: string;
  /**
   * The checkout UI field that the error is associated with.
   *
   * Example: `$.cart.deliveryGroups[0].deliveryAddress.countryCode`
   *
   * See the [supported targets](/docs/api/functions/reference/cart-checkout-validation/graphql#supported-targets)
   * for more information.
   */
  target?: string;
}