PaymentResponse.retry() - Web APIs 编辑

Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The PaymentResponse interface's retry() method makes it possible to ask the user to retry a payment after an error occurs during processing. This lets your app gracefully deal with situations such as invalid shipping addresses or declined credit cards.

Syntax

retryPromise = paymentRequest.retry(errorFields);

Parameters

errorFields

A PaymentValidationErrors object, with the following properties:

error Optional

A general description of a payment error from which the user may attempt to recover by retrying the payment, possibly after correcting mistakes in the payment information. error can be provided all by itself to provide only a generic error message, or in concert with the other properties to serve as an overview while other properties' values gude the user to errors in specific fields in the payment form.

payer Optional

A PayerErrors compliant object which provides appropriate error messages for any of the fields describing the payer which failed validation.

paymentMethod Optional

Any payment method specific errors which may have occurred. This object's contents will vary depending on the payment used. For example, if the user chose to pay by credit  card using the basic-card payment method, this is a BasicCardErrors object.

shippingAddress Optional

An AddressErrors object which contains error messages for any of the fields in the shipping address that failed validation.

Return value

A Promise which is resolved when the payment is successfully completed. The promise is rejected with an appropriate exception value if the payment fails again.

Typically you will use this by calling show(), then entering a loop or recursive function that checks the PaymentResponse for errors or other reasons to retry the payment request. If a retry is needed, the loop calls retry(), then loops back to check the response when it comes in. The loop exits only when the user either cancels the payment request or the request is successful.

See the example below for a thorough example, but the basic concept, in outline form, is:

1. Create a new PaymentRequest (newPaymentRequest())
2. Display the payment request (PaymentRequest.show()
3. If show() resolves, the returned PaymentResponse describes the requested payment and the options chosen by the user. Continue by...
   1. Validate the returned response; if there are any fields whose values are not acceptable, call the response's complete() method with a value of "fail" to indicate failure.
   2. If the response's data is valid and acceptable, call complete("success") to finalize the payment and proces it.
4. If show() is rejected, the payment request failed, usually because either there's already one being processed, because the user agent doesn't support any of the specified payment methods, or because of a security issue. See the list of exceptions for show() for further details. Call complete("fail") to close the payment request.

async function handlePayment() {
  const payRequest = new PaymentRequest(methodData, details, options);

  try {
    let payResponse = await payRequest.show();

    while (payResponse has errors) {
      /* let the user edit the payment information,
         wait until they submit */
      await response.retry();
    }
    await payResponse.complete("success");
  } catch(err) {
    /* handle the exception */
  }
}

Examples

try { await paymentRequest.retry(errorFields); } catch (DOMException err) { ... }

async function doPaymentRequest() {
  const request = new PaymentRequest(methodData, details, options);
  const response = await request.show();
  await recursiveValidate(request, response);
  await response.complete("success");
}

// Keep validating until the data looks good!
async function recursiveValidate(request, response) {
  const promisesToFixThings = [];
  const errors = await validate(request, response);
  if (!errors) {
    return;
  }
  if (errors.shippingAddress) {
    // "shippingaddresschange" fired at request object
    const promise = fixField(request, "shippingaddresschange", shippingValidator);
    promisesToFixThings.push(promise);
  }
  if (errors.payer) {
    // "payerdetailchange" fired at response object
    const promise = fixField(response, "payerdetailchange", payerValidator);
    promisesToFixThings.push(promise);
  }
  await Promise.all([response.retry(errors), ...promisesToFixThings]);
  await recursiveValidate(request, response);
}

function fixField(requestOrResponse, event, validator) {
  return new Promise(resolve => {
    // Browser keeps calling this until promise resolves.
    requestOrResponse.addEventListener(event, async function listener(ev) {
      const promiseToValidate = validator(requestOrResponse);
      ev.updateWith(promiseToValidate);
      const errors = await promiseToValidate;
      if (!errors) { // yay! fixed!
        event.removeEventListener(event, listener);
        resolve();
      }
    });
  });
}

doPaymentRequest();

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• PaymentResponse interface.