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 toggle; not just to enter fullscreen mode, but to exit it if the user is in fullscreen. It goes into fullscreen mode perfectly, and executes the exit fullscreen code (as the alert() box is shown which runs after the exit code but inside the exit code condition only) yet it does nothing.

I have read up on this here, and here which seems that I am doing everything correct, but something is missing. Could you please assist in figuring out how to make this procedural code work.

function fullscreen() {  	var isInFullScreen = (document.fullscreenElement && document.fullscreenElement !== null) ||  		(document.webkitFullscreenElement && document.webkitFullscreenElement !== null) ||  		(document.mozFullScreenElement && document.mozFullScreenElement !== null) ||  		(document.msFullscreenElement && document.msFullscreenElement !== null);    	var docElm = document.documentElement;  	if (!isInFullScreen) {  		if (docElm.requestFullscreen) {  			docElm.requestFullscreen();  		} else if (docElm.mozRequestFullScreen) {  			docElm.mozRequestFullScreen();  		} else if (docElm.webkitRequestFullScreen) {  			docElm.webkitRequestFullScreen();  		} else if (docElm.msRequestFullscreen) {  			docElm.msRequestFullscreen();  		}  	} else {  		if (docElm.exitFullscreen) {  			docElm.exitFullscreen();  		} else if (docElm.webkitExitFullscreen) {  			docElm.webkitExitFullscreen();  		} else if (docElm.mozCancelFullScreen) {  			docElm.mozCancelFullScreen();  		} else if (docElm.msExitFullscreen) {  			docElm.msExitFullscreen();  		}  		alert('exit fullscreen, doesnt work');  	}  }

<a onclick="fullscreen()" href="javascript:void(0);">Toggle FullScreen</a>

I also tried adding parent.exitfs() where the alert code is, according to this questions accepted answer and still has no impact

Answer 1

Figured it out.

Apparently, to enter full screen, you need to use the Element, however to exit fullscreen, you use document.

Here is the complete javascript function to toggle fullscreen that works !!!

function fullscreen() {     var isInFullScreen = (document.fullscreenElement && document.fullscreenElement !== null) ||         (document.webkitFullscreenElement && document.webkitFullscreenElement !== null) ||         (document.mozFullScreenElement && document.mozFullScreenElement !== null) ||         (document.msFullscreenElement && document.msFullscreenElement !== null);      var docElm = document.documentElement;     if (!isInFullScreen) {         if (docElm.requestFullscreen) {             docElm.requestFullscreen();         } else if (docElm.mozRequestFullScreen) {             docElm.mozRequestFullScreen();         } else if (docElm.webkitRequestFullScreen) {             docElm.webkitRequestFullScreen();         } else if (docElm.msRequestFullscreen) {             docElm.msRequestFullscreen();         }     } else {         if (document.exitFullscreen) {             document.exitFullscreen();         } else if (document.webkitExitFullscreen) {             document.webkitExitFullscreen();         } else if (document.mozCancelFullScreen) {             document.mozCancelFullScreen();         } else if (document.msExitFullscreen) {             document.msExitFullscreen();         }     } } 

And a simple case on how to use it :

<button onclick="fullscreen()">Toggle FullScreen</button> 

You need to make sure that this is a short method called when the user does an action on the page. From what the documentation says, is this is a feature that requires a higher access mode, and thus you can not (at this time) automatically force fullscreen on things like when the page has loaded, or async events (unless they are events from a users action like Click), etc.