PaymentResponse: payerdetailchange event
========================================

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

**Deprecated:** This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

**Non-standard:** This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

A **`payerdetailchange`** event is fired by the Payment Request API to a `PaymentResponse` object when the user makes changes to their personal information while filling out a payment request form. This can happen when the payer is retrying to submit its details after an error has been detected.

The event handler for `payerdetailchange` should check each value in the form that has changed and ensure that the values are valid. If any are invalid, appropriate error messages should be configured and the `retry()` method should be called on the `PaymentResponse` to ask the user to update the invalid entries.

This event is not cancelable and does not bubble.

Syntax
------

Use the event name in methods like `addEventListener()`, or set an event handler property.


```js
addEventListener("payerdetailchange", async (event) => {});

onpayerdetailchange = async (event) => {};
```

Event type
----------

A `PaymentRequestUpdateEvent`. Inherits from `Event`.

Event

PaymentRequestUpdateEventEvent properties
----------------

Although this event type is `PaymentRequestUpdateEvent`, it doesn't implement any property that is not already on `Event`.

Examples
--------

In the example below, `onpayerdetailchange` is used to set up a listener for the `payerdetailchange` event in order to validate the information entered by the user, requesting that any mistakes be corrected


```js
// Options for PaymentRequest(), indicating that shipping address,
// payer email address, name, and phone number all be collected.

const options = {
  requestShipping: true,
  requestPayerEmail: true,
  requestPayerName: true,
  requestPayerPhone: true,
};
const request = new PaymentRequest(methods, details, options);
const response = request.show();

// Get the data from the response

let {
  payerName: oldPayerName,
  payerEmail: oldPayerEmail,
  payerPhone: oldPayerPhone,
} = response;

// Set up a handler for payerdetailchange events, to
// request corrections as needed.

response.onpayerdetailchange = async (ev) => {
  const promisesToValidate = [];
  const { payerName, payerEmail, payerPhone } = response;

  // Validate each value which changed by calling a function
  // that validates each type of data, returning a promise which
  // resolves if the data is valid.

  if (oldPayerName !== payerName) {
    promisesToValidate.push(validateName(payerName));
    oldPayerName = payerName;
  }
  if (oldPayerEmail !== payerEmail) {
    promisesToValidate.push(validateEmail(payerEmail));
    oldPayerEmail = payerEmail;
  }
  if (oldPayerPhone !== payerPhone) {
    promisesToValidate.push(validatePhone(payerPhone));
    oldPayerPhone = payerPhone;
  }

  // As each validation promise resolves, add the results of the
  // validation to the errors list

  const errors = await Promise.all(promisesToValidate).then((results) =>
    results.reduce((errors, result), Object.assign(errors, result)),
  );

  // If we found any errors, wait for them to be corrected

  if (Object.getOwnPropertyNames(errors).length) {
    await response.retry(errors);
  } else {
    // We have a good payment; send the data to the server
    await fetch("/pay-for-things/", { method: "POST", body: response.json() });
    response.complete("success");
  }
};

await response.retry({
  payer: {
    email: "invalid domain.",
    phone: "invalid number.",
  },
});
```

### addEventListener equivalent

You could also set up the event handler using the `addEventListener()` method:


```js
response.addEventListener("payerdetailchange", async (ev) => {
  // …
});
```

Browser compatibility
---------------------

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

See also
--------

* Payment Request API
* Using the Payment Request API
* `PaymentResponse`
* `paymentmethodchange`
* `shippingaddresschange`
* `shippingoptionchange`