Angular 7 - How does work the HTML5 Fullscreen API ? I've a lot of errors

Question

I use Angular 7 and I would like have a button for put my app in fullscreen. I use the HTML5 Fullscreen API and I've make 2 functions :

openfullscreen() {
    // Trigger fullscreen
    console.log('gg');
    if (document.documentElement.requestFullscreen) {
      document.documentElement.requestFullscreen();
    } else if (document.documentElement.mozRequestFullScreen) { /* Firefox */
      document.documentElement.mozRequestFullScreen();
    } else if (document.documentElement.webkitRequestFullscreen) { /* Chrome, Safari and Opera */
      document.documentElement.webkitRequestFullscreen();
    } else if (document.documentElement.msRequestFullscreen) { /* IE/Edge */
      document.documentElement.msRequestFullscreen();
    }
    this.isfullscreen = true;
  }

  closefullscreen(){
    if (document.exitFullscreen) {
      document.exitFullscreen();
    } else if (document.mozCancelFullScreen) { /* Firefox */
      document.mozCancelFullScreen();
    } else if (document.webkitExitFullscreen) { /* Chrome, Safari and Opera */
      document.webkitExitFullscreen();
    } else if (document.msExitFullscreen) { /* IE/Edge */
      document.msExitFullscreen();
    }
    this.isfullscreen = false;
  }

It worked in the beginning but I had a lot of error :

error TS2339: Property 'mozRequestFullScreen' does not exist on type 'HTMLElement'.

error TS2339: Property 'mozRequestFullScreen' does not exist on type 'HTMLElement'.

error TS2339: Property 'webkitRequestFullscreen' does not exist on type 'HTMLElement'.

error TS2339: Property 'webkitRequestFullscreen' does not exist on type 'HTMLElement'.

error TS2551: Property 'msRequestFullscreen' does not exist on type 'HTMLElement'. Did you mean 'requestFullscreen'?

error TS2551: Property 'msRequestFullscreen' does not exist on type 'HTMLElement'. Did you mean 'requestFullscreen'?

error TS2339: Property 'mozCancelFullScreen' does not exist on type 'Document'.

error TS2339: Property 'mozCancelFullScreen' does not exist on type 'Document'.

error TS2339: Property 'webkitExitFullscreen' does not exist on type 'Document'.

error TS2339: Property 'webkitExitFullscreen' does not exist on type 'Document'.

error TS2551: Property 'msExitFullscreen' does not exist on type 'Document'. Did you mean 'exitFullscreen'?

error TS2551: Property 'msExitFullscreen' does not exist on type 'Document'. Did you mean 'exitFullscreen'?

When I restart my code I've the same errors but, in addition, I've that :

Failed to compile.

And my app don't work. How I can compile without errors?

Storekeeper

the angular document type doesn't provide those methods or properties. You either need to write a type extension that does provide them or probably just use a lib like screenfull.js which does all this garbage for you. don't reinvent the wheel. – Counsel

Thank's, but this can work with the HTML5 API, and the problem is just the Angular cli seen an error, this work but the angular cli stop the compiling. – Spitball

Possible duplicate of FullScreen Request on Angular 2/4 – Clayborne

Read what i said again. The problem is the typing. The accepted answer does exactly what i said, it extends the typing. – Counsel

Ok. Excuse me, I did not understand as you were talking about screenfull.js. Sory. – Spitball

https://mcmap.net/q/524219/-how-do-i-get-typescript-to-stop-complaining-about-functions-it-doesn-39-t-know-about – Dalessio

Answer 1

You can tell typescript about the methods that you're going to use by using the as keyword to cast the interface of document and document.documentElement.

Like this:

const docElmWithBrowsersFullScreenFunctions = document.documentElement as HTMLElement & {
  mozRequestFullScreen(): Promise<void>;
  webkitRequestFullscreen(): Promise<void>;
  msRequestFullscreen(): Promise<void>;
};

const docWithBrowsersExitFunctions = document as Document & {
  mozCancelFullScreen(): Promise<void>;
  webkitExitFullscreen(): Promise<void>;
  msExitFullscreen(): Promise<void>;
};

Please note that this just prevents compile error and you still should check if the methods exist like you did.

So your methods will be like this:

openfullscreen() {
  // Trigger fullscreen
  const docElmWithBrowsersFullScreenFunctions = document.documentElement as HTMLElement & {
    mozRequestFullScreen(): Promise<void>;
    webkitRequestFullscreen(): Promise<void>;
    msRequestFullscreen(): Promise<void>;
  };

  if (docElmWithBrowsersFullScreenFunctions.requestFullscreen) {
    docElmWithBrowsersFullScreenFunctions.requestFullscreen();
  } else if (docElmWithBrowsersFullScreenFunctions.mozRequestFullScreen) { /* Firefox */
    docElmWithBrowsersFullScreenFunctions.mozRequestFullScreen();
  } else if (docElmWithBrowsersFullScreenFunctions.webkitRequestFullscreen) { /* Chrome, Safari and Opera */
    docElmWithBrowsersFullScreenFunctions.webkitRequestFullscreen();
  } else if (docElmWithBrowsersFullScreenFunctions.msRequestFullscreen) { /* IE/Edge */
    docElmWithBrowsersFullScreenFunctions.msRequestFullscreen();
  }
  this.isfullscreen = true;
}

closefullscreen(){
  const docWithBrowsersExitFunctions = document as Document & {
    mozCancelFullScreen(): Promise<void>;
    webkitExitFullscreen(): Promise<void>;
    msExitFullscreen(): Promise<void>;
  };
  if (docWithBrowsersExitFunctions.exitFullscreen) {
    docWithBrowsersExitFunctions.exitFullscreen();
  } else if (docWithBrowsersExitFunctions.mozCancelFullScreen) { /* Firefox */
    docWithBrowsersExitFunctions.mozCancelFullScreen();
  } else if (docWithBrowsersExitFunctions.webkitExitFullscreen) { /* Chrome, Safari and Opera */
    docWithBrowsersExitFunctions.webkitExitFullscreen();
  } else if (docWithBrowsersExitFunctions.msExitFullscreen) { /* IE/Edge */
    docWithBrowsersExitFunctions.msExitFullscreen();
  }
  this.isfullscreen = false;
}

Terrigenous

@JérémyChamboultou I updated my answer. I didn't test it so please let me know if that works – Terrigenous

Answer 2

Defining types:

type ExitFullscreen = typeof document.exitFullscreen
type RequestFullscreen = typeof document.documentElement.requestFullscreen

declare global {
  interface Document {
    webkitExitFullscreen: ExitFullscreen;
    mozCancelFullScreen: ExitFullscreen;
    msExitFullscreen: ExitFullscreen;
  }

  interface HTMLElement {
    webkitRequestFullscreen: RequestFullscreen;
    mozRequestFullScreen: RequestFullscreen;
    msRequestFullscreen: RequestFullscreen;
  }
}

Cymar