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PWA-Workshop: Angular Everywhere - So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)

PWA-Workshop: Angular Everywhere - So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)

Stellen Sie sich vor, Sie schreiben Ihre moderne Businessanwendung genau einmal – und sie läuft auf Windows, macOS, Linux, Android, iOS und im Browser. Diese Anwendungen werden per Fingertippen aus dem Browser auf dem Gerät installiert und funktionieren auch dann, wenn das WiFi im Zug gerade mal wieder nicht funktioniert. Das klingt fantastisch? Dank Progressive Web Apps (PWA) wird all das Wirklichkeit. Mit Hilfe moderner Webtechnologien wird aus einer Webanwendung eine App, die einer nativen App in nichts nachsteht. In diesem Workshop zeigen wir anhand eines durchgängigen Beispiels die Grundlagen der PWA-Entwicklung mit Googles Single Page App Framework Angular, bei denen Sie aktiv mitentwickeln können. Jede(r) geht mit einer PWA nach Hause!

Christian Liebel

October 01, 2023
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  1. Workshop
    Angular meets Project Fugu
    Produktivitäts-PWAs auf Desktopniveau
    (Hands-on)
    Christian Liebel
    @christianliebel
    Consultant
    Patrick Jahr
    @jahr_patrick
    Developer Consultant

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  2. Hello, it’s me.
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Christian Liebel
    Twitter:
    @christianliebel
    Email:
    christian.liebel
    @thinktecture.com
    Angular & PWA
    Slides:
    thinktecture.com
    /christian-liebel

    View full-size slide

  3. Hello, it’s me.
    Patrick Jahr
    Developer Consultant @ Thinktecture AG
    Frontend: Angular, Blazor | Backend: ASP.NET Core,
    .NET
    E-Mail: [email protected]
    Twitter: @jahr_patrick
    Slides: https://thinktecture.com/patrick-jahr
    Patrick Jahr
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Angular Everywhere

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  4. 08:30–10:00 Block 1
    10:00–10:30 Break
    10:30–12:00 Block 2
    12:00-13:00 Lunch
    13:00-14:30 Block 3
    14:30-15:00 Break
    15:00-16:30 Block 4
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Timetable

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  5. 08:30–10:00 Block 1
    10:00–10:15 Break
    10:15–12:00 Block 2
    12:00-12:45 Lunch
    12:45-14:15 Block 3
    14:15-14:30 Break
    14:30-15:45 Block 4
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Timetable Idea

    View full-size slide

  6. Things NOT to expect
    - Blueprint for PWA
    development
    - No AuthN/AuthZ
    Things To Expect
    - Extensive/up-to-date insights
    into PWA and Project Fugu
    - A productivity app use case
    that works on your desktop &
    smartphone
    - Lots of fun
    - Hands-on exercises
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Angular Everywhere

    View full-size slide

  7. https://paint.js.org
    – Productivity app
    – Draw images
    – Lots of actions & tools
    – Installable
    – Read/save files
    – Copy/paste images
    from/to clipboard
    – Share files to other apps
    – Register for file extensions
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Demo Use Case

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  8. (Workshop Edition)
    – Productivity app
    – Draw images
    – Lots of actions & tools
    – Installable
    – Read/save files
    – Copy/paste images
    from/to clipboard
    – Share files to other apps
    – Register for file extensions
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Demo Use Case

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  9. Setup complete?
    (Node.js, Google Chrome, Editor, Git)
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Setup (1/3)
    LAB #0

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  10. git clone https://github.com/thinktecture-labs/
    basta-2023-angular-project-fugu.git
    cd basta-2023-angular-project-fugu
    npm i
    npm start -- --open
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Setup (3/3)
    LAB #0

    View full-size slide

  11. Paint PWA
    Capabilitie
    s
    Progressive
    Enhanceme
    nt
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Agenda

    View full-size slide

  12. Paint PWA
    Capabilitie
    s
    Progressive
    Enhanceme
    nt
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Agenda

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  13. Canvas
    – Plain bitmap for the web
    – Cross-platform, hardware-
    accelerated graphics
    operations
    – Supports different contexts
    (2D, 3D: WebGL, WebGL 2.0)
    – Supported on all evergreen
    browsers and on IE 9+
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint

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  14. Canvas
    Add a canvas element to app.component.html:

    Query the canvas element in app.component.ts:
    @ViewChild('canvas') canvas?: ElementRef;
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint
    LAB #1

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  15. Canvas 2D Context
    fillRect(x, y, width, height)
    strokeRect(x, y, width, height)
    beginPath()
    moveTo(x, y)
    lineTo(x, y)
    fill()
    stroke()
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint

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  16. Canvas 2D Context
    1. Introduce a new field at the top of
    app.component.ts:
    context?: CanvasRenderingContext2D;
    2. Get the 2D context in ngAfterViewInit():
    const canvas =
    this.canvas!.nativeElement;
    const ctx = canvas.getContext('2d')!;
    this.context = ctx;
    3. Prepare the canvas:
    ctx.fillStyle = 'white';
    ctx.fillRect(0, 0,
    canvas.width,
    canvas.height);
    ctx.fillStyle = 'black';
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint LAB #2

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  17. Low-latency Rendering
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint
    Web pages need to synchronize
    with the DOM on graphics updates
    causing latencies that can make
    drawing difficult
    Low-latency rendering skips
    syncing with the DOM with can lead
    to a more natural experience
    Supported on Chrome (Chrome OS
    and Windows only)

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  18. Low-latency Rendering
    Opt-in to low-latency rendering (app.js):
    const ctx = canvas.getContext('2d', {
    desynchronized: true
    })!;
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint
    LAB #3

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  19. Pointer Events
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint
    Users nowadays use different
    input methods, cross-platform
    apps should cover all of them
    Pointer Events offer an
    abstract interface to catch all
    input methods (pointerdown,
    pointermove, pointerup)
    event.offsetX/event.offsetY
    contain the pointer’s position
    relative to the listener

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  20. Pointer Events
    1. In app.component.html, add event bindings for the pointer events:
    (pointerdown)="onPointerDown($event)"
    (pointermove)="onPointerMove($event)"
    (pointerup)="onPointerUp()"
    >
    2. In app.component.ts (onPointerMove()), draw the user input:
    this.context!.fillRect(event.offsetX, event.offsetY, 2, 2);
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint LAB #4

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  21. Bresenham Line Algorithm
    The user may move faster than
    the input can be processed
    For this case, we need to
    remember the previous point
    and interpolate the points in
    between
    The Bresenham line algorithm
    calculates the missing pixels
    between two given points
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint

    View full-size slide

  22. Bresenham Line Algorithm
    1. At the top of app.component.ts, a field called previousPoint to store
    the previous point:
    previousPoint?: { x: number, y: number };
    2. In onPointerDown(), set the current point as the previous point:
    this.previousPoint = { x: event.offsetX, y: event.offsetY };
    3. In onPointerUp(), set this.previousPoint to undefined.
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint LAB #5

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  23. Bresenham Line Algorithm
    4. In onPointerMove(), call the Bresenham line algorithm with the points:
    if (this.previousPoint) {
    const currentPoint = { x: event.offsetX, y: event.offsetY };
    for (const point of
    this.paintService.bresenhamLine(this.previousPoint,
    currentPoint)) {
    this.context!.fillRect(point.x, point.y, 2, 2);
    }
    this.previousPoint = currentPoint;
    }
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint LAB #5

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  24. Color Selection
    For this demo, we will only
    implement the brush tool. However,
    we want to bring in some color.
    A simple method to implement a
    color selection is to use the HTML
    color-type input element that
    shows the native color picker:

    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint

    View full-size slide

  25. Color Selection
    1. In app.component.html, replace the content of the node with:

    2. In app.component.ts (onColorChange()), update the context’s fill style
    accordingly:
    this.context!.fillStyle = color.value;
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Paint
    LAB #6

    View full-size slide

  26. Paint PWA
    Capabilitie
    s
    Progressive
    Enhanceme
    nt
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Agenda

    View full-size slide

  27. So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Angular Everywhere
    Responsive Linkable Discoverable Installable App-like
    Connectivity
    Independent
    Fresh Safe Re-engageable Progressive

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  28. Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Web App
    Manifest
    Service
    Worker

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  29. Web Application Manifest
    Distinguishes Web Apps from
    Websites
    JSON-based file containing
    metadata for apps only
    Apps can be identified by search
    engines, app store providers, etc.
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA

    View full-size slide

  30. manifest.webmanifest
    {
    "short_name": "Paint",
    "name": "Paint Workshop",
    "theme_color": "white",
    "icons": [{
    "src": "icon.png",
    "sizes": "512x512"
    }],
    "start_url": "/index.html",
    "display": "standalone",
    "shortcuts": [/* … */]
    }
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    Names
    Icons
    Display Mode
    Shortcuts
    Start URL
    Theme color (status bar/window bar)

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  31. Manifest Display Modes
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    browser minimal-ui standalone fullscreen

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  32. Manifest Icon Purposes
    (any)
    any context (e.g. app icon)
    monochrome
    different color requirements
    maskable
    user agent masks icon as required
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    Safe Zone
    Windows iOS Android

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  33. Web App Manifest
    1. Stop the npm start command, then run the following command to
    add PWA support to the current project:
    npm run ng add @angular/pwa
    2. In manifest.webmanifest,
    a) set name and short_name to values of your choice
    b) change the theme_color to #000080
    c) change the background_color to #808080
    3. In index.html, change the theme-color to #000080.
    4. Test manifest in DevTools: F12 > Application > Manifest
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA LAB #7

    View full-size slide

  34. Manifest Shortcuts
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    Secondary entrypoints for your
    application (e.g., home screen
    quick actions, jump lists, …)
    Static definition in Web
    Application Manifest
    Supported by Google Chrome
    for Android, macOS and
    Windows

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  35. Web App Manifest
    1. In manifest.webmanifest, add (at least) the following shortcut:
    "shortcuts": [{
    "name": "About Paint",
    "short_name": "About",
    "description": "Show information about Paint",
    "url": "./",
    "icons": [{ "src": "assets/icons/icon-512x512.png", "sizes": "512x512" }]
    }]
    2. Test in DevTools: F12 > Application > Manifest
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    LAB #8

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  36. Web App Manifest – Chrome Install Criteria
    1. Web App is not already installed
    2. Meets a user engagement heuristic (user has interacted and clicked
    with origin for at least 30 seconds)
    3. Includes a Web App Manifest that has short_name or name, at least a
    192px and 512px icon, a start_url and a display mode of
    fullscreen, standalone or minimal-ui
    4. Served over HTTPS
    5. Has a registered service worker with a fetch event handler (subject
    to change!)
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    https://web.dev/install-criteria/

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  37. Service Worker
    JavaScript executed in an own
    thread, registered by the website
    Acts as a controller, proxy, or
    interceptor
    Has a cache to store responses (for
    offline availability and performance)
    Can wake up even when the website
    is closed and perform background
    tasks (e.g., push notifications or sync)
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA

    View full-size slide

  38. Service Worker
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    Service
    Worker
    Internet
    Website
    HTML/JS
    Cache
    fetch

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  39. NgServiceWorker
    Angular CLI supports Service
    Worker generation by simply
    adding PWA support:
    ng add @angular/pwa
    One-size-fits-all Service
    Worker
    Pre-defined functionality,
    limited customizability
    PWA
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Angular Everywhere

    View full-size slide

  40. Workbox
    Toolchain by Google
    Includes a CLI
    Generates a service worker
    implementation from directory
    contents (e.g., build output, or
    our development directory)
    Allows you to modify the
    service worker behavior
    (maximum flexibility)
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA

    View full-size slide

  41. Service Worker
    1. In your console, run: npm run pwa
    2. Test in DevTools: F12 > Application > Service Worker
    3. Install the app: Address Bar > Install
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    LAB #9

    View full-size slide

  42. Push Notifications
    Just as native apps, PWAs can
    receive push notifications
    Combination of two technologies:
    Web Notifications and Push API
    Supported by Chrome, Edge,
    Firefox, Safari
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA

    View full-size slide

  43. Service Worker Debugging
    More information on installed
    service workers can be found on
    • about://serviceworker-
    internals (Chromium-based
    browsers)
    • about:serviceworkers
    (Mozilla Firefox)
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA

    View full-size slide

  44. Service Worker Debugging
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA

    View full-size slide

  45. Lighthouse
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    Auditing tool by Google,
    integrated in Chrome DevTools
    Automatically checks
    performance metrics, PWA
    support, accessibility, SEO and
    other best practices and gives
    tips on how to improve
    Can simulate mobile devices

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  46. Lighthouse
    1. Make sure only one tab/window of your PWA is open
    2. Open DevTools: F12 > Lighthouse
    3. Make sure to select at least the “Progressive Web App” category
    4. Click “Analyze page load”
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    PWA
    LAB #10

    View full-size slide

  47. Paint PWA
    Capabilitie
    s
    Progressive
    Enhanceme
    nt
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Agenda

    View full-size slide

  48. Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)

    View full-size slide

  49. Project Fugu
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    »Let’s bring the web
    back – API by API«
    Thomas Steiner, Google

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  50. Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    Contacts
    Picker
    Screen Wake
    Lock API
    File System
    Access API
    Shape
    Detection API

    View full-size slide

  51. Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    https://goo.gle/fugu-api-tracker

    View full-size slide

  52. Browser
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    navigator.share({ url: 'http://example.com' });
    ShareIntent DataTransferManager

    NSSharingServicePicker

    View full-size slide

  53. File System Access API
    Some applications heavily rely
    on working with files (e.g.
    Visual Studio Code, Adobe
    Photoshop, …)
    File System Access API allows
    you to open, save and override
    files and directories
    Supported by Chrome, Edge
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities

    View full-size slide

  54. File System Access API
    1. Add the following buttons to the bar in app.component.html
    (before the color input):
    Open
    Save
    Copy
    Paste
    Share
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #11

    View full-size slide

  55. File System Access API
    2. Add the following lines at the top of app.component.ts:
    readonly fileOptions = {
    types: [{
    description: 'PNG files',
    accept: {'image/png': ['.png']}
    }]
    };
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #11

    View full-size slide

  56. File System Access API
    3. Add the following lines to the save() function:
    const blob = await
    this.paintService.toBlob(this.canvas!.nativeElement);
    const handle = await
    window.showSaveFilePicker(this.fileOptions);
    const writable = await handle.createWritable();
    await writable.write(blob);
    await writable.close();
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #11

    View full-size slide

  57. File System Access API
    Add the following code to the open() function:
    const [handle] = await
    window.showOpenFilePicker(this.fileOptions);
    const file = await handle.getFile();
    const image = await this.paintService.getImage(file);
    this.context!.drawImage(image, 0, 0);
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #12

    View full-size slide

  58. Async Clipboard API
    Allows reading from/writing to
    the clipboard in an
    asynchronous manner (UI won’t
    freeze during long-running
    operations)
    Reading from the clipboard
    requires user consent first
    (privacy!)
    Supported by Chrome, Edge
    and Safari and Firefox (plain-
    text only)
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities

    View full-size slide

  59. Async Clipboard API
    Add the following code to the copy() function:
    await navigator.clipboard.write([
    new ClipboardItem({ "image/png":
    this.paintService.toBlob(this.canvas!.nativeElement) }),
    ]);
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #13

    View full-size slide

  60. Async Clipboard API
    const clipboardItems = await navigator.clipboard.read();
    for (const clipboardItem of clipboardItems) {
    for (const type of clipboardItem.types) {
    if (type === 'image/png') {
    const blob = await clipboardItem.getType(type);
    const image = await this.paintService.getImage(blob);
    this.context!.drawImage(image, 0, 0);
    }
    }
    }
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #14

    View full-size slide

  61. Web Share API
    Allows sharing a title, URL, text, or
    files
    API can only be invoked as a
    result of a user action (i.e. a click
    or keypress)
    Supported by Chrome, Edge,
    Safari and Firefox (Android only)
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities

    View full-size slide

  62. Web Share API
    const blob = await
    this.paintService.toBlob(this.canvas!.nativeElement);
    const file = new File([blob], 'untitled.png', {type:
    'image/png'});
    const item = { files: [file], text: 'Awesome drawing' };
    if (navigator.canShare(item)) {
    await navigator.share(item);
    }
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #15

    View full-size slide

  63. File Handling API
    Register your PWA as a
    handler for file extensions
    Requires installing the
    application first
    Declare supported extensions
    in Web App Manifest and add
    imperative code to your
    application logic
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities

    View full-size slide

  64. File Handling API
    1. Add the following property to your manifest (manifest.webmanifest):
    "file_handlers": [{
    "action": "/index.html",
    "accept": {
    "image/png": [".png"]
    }
    }]
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #16

    View full-size slide

  65. File Handling API
    2. Add the following code to ngAfterViewInit() in app.component.ts:
    if ('launchQueue' in window) {
    window.launchQueue.setConsumer(async params => {
    const [handle] = params.files;
    if (handle) {
    const file = await handle.getFile();
    const image = await this.paintService.getImage(file);
    ctx.drawImage(image, 0, 0);
    }
    });
    }
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #16

    View full-size slide

  66. File Handling API
    3. Rebuild PWA: npm run pwa
    Note: Wait for a few seconds and reload the application after opening,
    as the PWA needs to fetch the new files first.
    about://apps
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities
    LAB #16

    View full-size slide

  67. Summary
    - Project Fugu helps the web to become more and more capable
    - Project Fugu APIs could bring many more app experiences to the web
    (IDEs, productivity apps, etc.)
    - But: Web is threatened by alternative approaches and platforms,
    support for modern Web API varies from platform to platform
    - You can make a difference!
    - File bugs in browser engine bugtrackers
    - File Fugu requests: https://goo.gle/new-fugu-request
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Capabilities

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  68. Paint PWA
    Capabilitie
    s
    Progressive
    Enhanceme
    nt
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Agenda

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  69. Overview
    Use available interfaces and functions of
    a system (opposite of Graceful
    Degradation)
    Users with modern, feature-rich
    browsers get a better experience
    Apps are available on older browsers, but
    with limited functionality
    Concept: Browser feature support should
    grow over time—thereby more users can
    enjoy an increasing number of features
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Progressive Enhancement

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  70. Overview
    if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register(…)
    .then(() => /* … */);
    }
    In JavaScript: check whether an API/feature is available. If yes—use it!
    Otherwise:
    1. Disable the functionality
    2. Fall back to an alternative API (if available)
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Progressive Enhancement

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  71. Disabling unsupported features
    In app.component.ts, introduce the following check object:
    readonly supported = {
    open: 'showOpenFilePicker' in window,
    } as const;
    In app.component.html, disable the open button if the API is unsupported:

    Open
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Progressive Enhancement LAB #17

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  72. Disabling unsupported features
    Introduce checks for the remaining APIs:
    1. Save: 'showSaveFilePicker' in window
    2. Copy: navigator.clipboard && 'write' in navigator.clipboard
    3. Paste: navigator.clipboard && 'read' in navigator.clipboard
    4. Share: 'canShare' in navigator
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Progressive Enhancement LAB #17

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  73. Providing an alternative implementation
    1. In the save() method of app.component.ts, test for the existence of
    the showSaveFilePicker() method on the window object.
    2. If the method does not exist, fall back to the following code for save:
    const anchor = document.createElement('a');
    const url = URL.createObjectURL(blob);
    anchor.href = url;
    anchor.download = '';
    anchor.click();
    URL.revokeObjectURL(url);
    3. Remove the compatibility check to always enable the button.
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Progressive Enhancement LAB #18

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  74. Run app on your device
    npm run pwa
    https://ngrok.com/download
    ngrok http 3000
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    LAB #19

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  75. Crunch Time
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    LAB #20

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  76. Q&A
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)

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  77. New powerful APIs regularly ship with new releases of Chromium-based
    browsers
    Some only add minor finishing touches, others enable whole application
    categories as productivity apps to finally make the shift to the web
    Some APIs already made their way into other browsers (e.g., Web Share)
    Fugu process makes sure that capabilities are implemented in a secure,
    privacy-preserving manner
    Let’s make the web a more capable platform!
    Angular Everywhere
    So entwickeln Sie Progressive Web Apps für alle Plattformen (hands-on)
    Summary

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  78. https://www.thinktecture.com/ueber-uns/karriere/
    Dankeschön!
    84
    Patrick Jahr
    https://thinktecture.com/patrick-jahr
    Christian Liebel
    https://thinktecture.com/christian-liebel
    Demos aus der Workshop
    https://github.com/thinktecture-
    labs/basta-2023-angular-project-fugu

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