pwa-update

pwa-update is a web component from the PWABuilder team that brings an awesome "update" experience to your Progressive Web App! It will automatically register your service worker and notify the user of when a new update to your PWA is available. Finally, this component will also let the user of your PWA know when your PWA is ready to be used offline, completing the experience.

Live demo: https://pwa-update.glitch.me

Built with lit-element

What does it look like?

Supported Browsers

• Edge
• Chrome
• Firefox
• Safari

Using this component

Install

There are two ways to use this component. For simple projects or just to get started fast, we recommend using the component by script tag. If your project is using npm then we recommend using the npm package.

Script tag

• Put this bit of code in your index.html

<script
  type="module"
  src="https://cdn.jsdelivr.net/npm/@pwabuilder/pwaupdate"
></script>

<pwa-update></pwa-update>

NPM

• Run npm install @pwabuilder/pwaupdate
• import with import '@pwabuilder/pwaupdate'

Then you can use the element <pwa-update></pwa-update> anywhere in your template, JSX, html etc. An example of using this component can be found here: https://pwa-update.glitch.me

API

Properties

| Property | Attribute | Description | Type | Default | | ---------------------- | ---------------------- | ------------------------------------------------------------------- | ----------------------- | ------------------------------------- | | updatemessage | updatemessage | Message that will be show to the user when there is an update | string | An update for this app is available | | updateevent | updateevent | name of event sent to service worker to start update | string | false | | readyToAsk | readyToAsk | Can be used to show the update prompt, alternative to updateevent | boolean | false | | swpath | swpath | The path to the service worker to be registered | string | pwabuilder-sw.js | | showStorageEstimate | showStorageEstimate | Show the user how much storage has been used by the PWA | boolean | false | | offlineToastDuration | offlineToastDuration | How long the offline toast is displayed | number (milliseconds) | 1300 |

CSS Variables

We recommend using our CSS variables to easily tweak the style of this component to fit your project. Here are our current supported CSS variables.

| name | Description | | --------------------- | --------------------------------------------------- | | --toast-background | Changes the background color of the toast | | --button-background | Changes the background color of the update button |

Shadow Parts

If you need to style this component more comprehensively, you can use Shadow Parts to style both the update toast and the "ready to use offline" toast. To target these two elements you can use pwa-update::part(updateToast) and pwa-update::part(offlineToast) respectively. For example, to make the background of the install button grey, I would need this CSS:

pwa-update::part(updateToast) {
  backround: grey;
}

Advanced Examples

Usage with typescript

// Types to be found in DefinitelyTyped sometime soon.
import "@pwabuilder/pwaupdate";

class YourClass extends RenderLib {
  ...

  get updateComponent(): PWAUpdate {
    return this.shadowRoot?.querySelector("pwa-update");
  }

  ...
}

Example with Component Reference (Web Components)

<template id="example">
  <style></style>
  ...
  <pwa-update></pwa-update>
</template>

customElements.define(
  "example",
  class Example extends HTMLElement {
    constructor() {
      super();
      let template = document.getElementById("example");
      let templateContent = template.content;
      this.shadowRoot = this.attachShadow({ mode: "open" }).appendChild(
        templateContent.cloneNode(true)
      );
      this.updateComponent = document
        .getElementsByTagName("el-example")[0]
        .shadowRoot.querySelector("pwa-update");
    }
  }
);

Example with Component Reference (Lit-Element)

// Using module import
import { LitElement, html, property, query } from "lit-element";
import "@pwabuilder/pwaupdate";

class Example extends LitElement {
  @query("installId") componentRef: HTMLElement;

  render() {
    return html`
      <body>
        <pwa-update id="installId"></pwa-update>
      </body>
    `;
  }

  interactionWithComponent() {
    // See the methods section
    this.componentRef.getInstalledStatus();
  }
}

Example with Component Reference (Fast-Element)

const template = html`
  <pwa-update ref('updateComponent')></pwa-update>
`

@customElement({ ... })
class Example extends FASTElement {
  @observable updateComponent: PWAUpdate | undefined;

  @volatile
  get updateComponent() {
    return this.shadowRoot.querySelector("pwa-update");
  }
}

Example of grabbing from the dom

<head>
  <script
    type="module"
    src="https://cdn.jsdelivr.net/npm/@pwabuilder/pwaupdate"
  ></script>
</head>
<body>
  <pwa-update id="updateComponent"></pwa-update>
  <script async defer>
    const ref = document.getElementById("updateComponent);
  </script>
</body>

Example of programmatically creating the element

<head>
  <script
    type="module"
    src="https://cdn.jsdelivr.net/npm/@pwabuilder/pwaupdate"
  ></script>
</head>
<body>
  <script async defer>
    var updateComponent = document.createElement("pwa-update");
    document.body.appendChild(updateComponent);
  </script>
</body>