AMP

Important: this documentation is not applicable to your currently selected format email!

amp-user-notification

Description

Displays a dismissable notification to the user.

 

Required Scripts

<script async custom-element="amp-user-notification" src="https://cdn.ampproject.org/v0/amp-user-notification-0.1.js"></script>

Supported Layouts

Usage

An id is required because multiple amp-user-notification elements are allowed and the id is used to differentiate them.

By supplying two URLs that get called before the notification is shown and after it is dismissed, it is possible to control per user as to whether the notification should be shown (using the ampUserId value). For example, it could only be shown to users in certain geolocations or prevent showing it again to the user when they've dismissed it before. If these URLs are not specified, the dismissal state will be queried and/or stored locally to determine whether to show the notification to the user.

To close amp-user-notification, add an on attribute to a button with the following value scheme on="event:idOfUserNotificationElement.dismiss" (see example below). This user action also triggers the GET to the data-dismiss-href URL. Be very mindful of the browser caching the GET response; see details below in the data-show-if-href section. (We recommend adding a unique value to the GET url like a timestamp as a query string field).

When multiple amp-user-notification elements are on a page, only one is shown at a single time (Once one is dismissed the next one is shown). The order of the notifications being shown is currently not deterministic.

<amp-user-notification
  layout="nodisplay"
  id="amp-user-notification1"
  data-show-if-href="https://foo.com/api/show-api?timestamp=TIMESTAMP"
  data-dismiss-href="https://foo.com/api/dismissed"
>
  This site uses cookies to personalize content.
  <a href="">Learn more.</a>
  <button on="tap:amp-user-notification1.dismiss">I accept</button>
</amp-user-notification>

A notification is shown when:

  1. There's no record locally that the user has dismissed the notification with the specified ID.
  2. When specified, data-show-if-href endpoint returns { "showNotification": true }.

When notification is dismissed:

  1. AMP stores the "dismiss" record locally for the specified ID. This will prevent the notification from being shown again.
  2. When specified, data-dismiss-href is invoked and can be used to make the "dismiss" record remotely.

JSON Fields

  • elementId (string): The HTML ID used on the amp-user-notification element.
  • ampUserId (string): This ID is passed to both the data-show-if-href GET request (as a query string field) and the data-dismiss-href POST request (as a json field). The ID will be the same for this user going forward, but no other requests in AMP send the same ID. You can use the ID on your side to lookup/store whether the user has dismissed the notification before.
  • showNotification (boolean): Indicates whether the notification should be shown. If false, the promise associated to the element is resolved right away.

Delaying Client ID generation until the notification is acknowledged

Optionally, you can delay generation of Client IDs used for analytics and similar purposes until an amp-user-notification is confirmed by the user. See these docs for how to implement this:

Attributes

data-show-if-href (optional)

When specified, AMP will make a CORS GET request with credentials to the specified URL to determine whether the notification should be shown. AMP appends the elementId and ampUserId query string fields to the href provided on the data-show-if-href attribute (see #1228 on why this is a GET instead of a POST).

As a best practice to not let the browser cache the GET response values, you should add a TIMESTAMP url replacement value to the data-show-if-href attribute value. You can add it as a query string field (e.g., data-show-if-href="https://foo.com/api/show-api?timestamp=TIMESTAMP").

If the data-show-if-href attribute is not specified, AMP will only check if the notification with the specified ID has been "dismissed" by the user locally. If not, the notification will be shown.

For handling CORS requests and responses, see the AMP CORS spec.

CORS GET request query string fields: elementId, ampUserId

https://foo.com/api/show-api?timestamp=1234567890&elementId=notification1&ampUserId=cid-value

CORS GET response JSON fields: showNotification. The response must contain a single JSON object with a showNotification field of type boolean. If this field is true, the notification will be shown, otherwise it won't.

{"showNotification": true}

data-show-if-geo

When specified amp-user-notification will only trigger if an amp-geo country group for matches one of the comma delimited list of country groups.

In the example below, if the user is located in Mexico (mx) the amp-geo will return the nafta country group. nafta is in the data-show-if-geo attribute so the notification will display.

<amp-geo layout="nodisplay">
  <script type="application/json">
    {
      "ISOCountryGroups": {
        "nafta": ["ca", "mx", "us"],
        "waldo": ["unknown"],
        "anz": ["au", "nz"]
      }
    }
  </script>
</amp-geo>

<amp-user-notification
  layout="nodisplay"
  id="amp-user-notification1"
  data-show-if-geo="nafta, anz"
  data-dismiss-href="https://example.com/api/echo/post"
>
  This notice is only shown in Canada, Mexico and USA.
  <a class="btn" on="tap:amp-user-notification1.dismiss">I accept</a>
</amp-user-notification>

data-show-if-not-geo

This is the opposite of data-show-if-geo. When specified amp-user-notification will only trigger if the amp-geo country group does not match the supplied list.

In this example user in Mexico would not trigger the notification, but a user in an unknon country (assigned to the whereIsWaldo group) would trigger the notifcation.

<amp-geo layout="nodisplay">
  <script type="application/json">
    {
      "ISOCountryGroups": {
        "nafta": ["ca", "mx", "us"],
        "whereIsWaldo": ["unknown"],
        "anz": ["au", "nz"]
      }
    }
  </script>
</amp-geo>

<amp-user-notification
  layout="nodisplay"
  id="amp-user-notification1"
  data-show-if-not-geo="anz, nafta"
  data-dismiss-href="https://example.com/api/echo/post"
>
  This notice is only shown in Canada, Mexico and USA.
  <a class="btn" on="tap:amp-user-notification1.dismiss">I accept</a>
</amp-user-notification>

Only one data-show-if-* attribute may be set.

data-dismiss-href (optional)

When specified, AMP will make a CORS POST request to the specified URL transmitting the elementId and ampUserId only when the user has explicitly agreed.

If this attribute is not specified, AMP will not send a request upon dismissal, and will only store the "dismissed" flag for the specified ID locally.

For handling CORS requests and responses, see the AMP CORS spec.

POST request JSON fields: elementId, ampUserId

Use the ampUserId field to store that the user has seen the notification before, if you want to avoid showing it in the future. It's the same value that will be passed in future requests to data-show-if-href.

{"elementId": "id-of-amp-user-notification", "ampUserId": "ampUserIdString"}

POST response should be a 200 HTTP code and no data is expected back.

data-persist-dismissal (optional)

By default, this is set to true. If set to false, AMP will not remember the user's dismissal of the notification. The notification will always show if the data-show-if-href result is show notification. If no data-show-if-href is provided the notification will always show.

Example 1:

<amp-user-notification
  layout="nodisplay"
  id="amp-user-notification5"
  data-persist-dismissal="false"
  data-show-if-href="https://example.com/api/shouldShow?timestamp=TIMESTAMP"
  data-dismiss-href="https://example.com/api/echo/post"
>
  This notification should ALWAYS show - if shouldShow endpoint response was
  true.
  <a href="#learn-more">Learn more.</a>
  <button on="tap:amp-user-notification5.dismiss">Dismiss</button>
</amp-user-notification>

Example 2:

<amp-user-notification
  layout="nodisplay"
  id="amp-user-notification6"
  data-persist-dismissal="false"
>
  This notification should ALWAYS show on every page visit.
  <a href="#learn-more">Learn more.</a>
  <button on="tap:amp-user-notification6.dismiss">Dismiss</button>
</amp-user-notification>

enctype (optional)

By default, this is set to application/json;charset=utf-8. But you can set it to application/x-www-form-urlencoded, AMP will send the post dismiss request using this content type instead.

<amp-user-notification
  layout="nodisplay"
  id="amp-user-notification7"
  enctype="application/x-www-form-urlencoded"
  data-persist-dismissal="false"
  data-show-if-href="https://example.com/api/shouldShow?timestamp=TIMESTAMP"
  data-dismiss-href="https://example.com/api/echo/post"
>
  This notification should ALWAYS show - if shouldShow endpoint response was
  true.
  <a href="#learn-more">Learn more.</a>
  <button on="tap:amp-user-notification7.dismiss">Dismiss</button>
</amp-user-notification>

Actions

The amp-user-notification exposes the following actions that you can use AMP on-syntax to trigger:

dismiss (default)

Closes the user notification.

Styling

The amp-user-notification component should always have layout=nodisplay and will be position: fixed after layout (default is bottom: 0, which can be overridden). If a page has more than one amp-user-notification element, then the notifications are queued up and only shown when the previous notification has been dismissed.

The amp-active (visibility: visible) class is added when the notification is displayed and removed when the notification has been dismissed. amp-hidden (visibility: hidden) is added when the notification has been dismissed.

For example, you can hook into these classes for a "fade in" transition.

Example: w/o vendor prefixes

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

amp-user-notification.amp-active {
  opacity: 0;
  animation: fadeIn ease-in 1s 1 forwards;
}

Validation

See amp-user-notification rules in the AMP validator specification.

需要更多帮助?

您已多次阅读本文档,但它仍未能涵盖您的所有问题?也许其他人也这么觉得:在 Stack Overflow 上与他们联系。

前往 Stack Overflow
发现错误或缺少功能?

AMP 项目强烈鼓励您参与并做出贡献!我们希望您能成为我们开放源代码社区的持续参与者,但我们也欢迎您对所热衷问题做出一次性贡献。

前往 GitHub