How to exit fullscreen onclick using Javascript?

Question

Not sure if the following code snip will work embedded on SO, as it didn\'t work when pasting it, however it does work stand-alone.

The problem, is I want this to be a t

Answer 1

Krang's answer was great, Carl's idea to modularize was too. But I couldn't easily understand his code. So here's my version in TypeScript:

function isInFullScreen() {
  const document: any = window.document;
  return (document.fullscreenElement && document.fullscreenElement !== null) ||
        (document.webkitFullscreenElement && document.webkitFullscreenElement !== null) ||
        (document.mozFullScreenElement && document.mozFullScreenElement !== null) ||
        (document.msFullscreenElement && document.msFullscreenElement !== null);
}

function requestFullScreen(elem: any) {
  if (elem.requestFullscreen) {
    elem.requestFullscreen();
  } else if (elem.mozRequestFullScreen) {
    elem.mozRequestFullScreen();
  } else if (elem.webkitRequestFullScreen) {
    elem.webkitRequestFullScreen();
  } else if (elem.msRequestFullscreen) {
    elem.msRequestFullscreen();
  } else {
    console.warn("Did not find a requestFullScreen method on this element", elem);
  }
}

function exitFullScreen() {
  const document: any = window.document;
  if (document.exitFullscreen) {
    document.exitFullscreen();
  } else if (document.webkitExitFullscreen) {
    document.webkitExitFullscreen();
  } else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
  } else if (document.msExitFullscreen) {
    document.msExitFullscreen();
  }
}

function toggleFullScreen(elem: any) {
  // based on https://stackoverflow.com/questions/36672561/how-to-exit-fullscreen-onclick-using-javascript
  if (isInFullScreen()) {
    exitFullScreen();
  } else {
    requestFullScreen(elem || document.body);
  }
}