Checking if browser is in fullscreen [duplicate]

Question

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Closed 8 years ago.

Possible Duplicate:
Detecting if a browser is in full screen mode

Is there a way to check if a browser is currently in fullscreen mode (after the user pressed f11)?

Something like:

if (window.fullscreen) {
  // it's fullscreen!
}
else {
  // not fs!
}

Thanks.

Steerpike's answer is pretty good, but my comment:

Thanks a lot, but this answer is not sufficient for FF. In Chrome I can set a small tolerance, but in FF the urlbar and tabs takes a while to disappear, which means after pressing f11, the detected window.innerWidth is still too small.

Answer 1

In Firefox 3, window.fullScreen works (https://developer.mozilla.org/en/DOM/window.fullScreen).

So, you could potentially do something like this:

if((window.fullScreen) ||
   (window.innerWidth == screen.width && window.innerHeight == screen.height)) {

} else {

}

Answer 2

This works for all new browsers :

if (!window.screenTop && !window.screenY) {
    alert('Browser is in fullscreen');
}

Answer 3

if(window.innerWidth == screen.width && window.innerHeight == screen.height) {

} else {

}

(Warning: The browser chrome may muck with the height comparisons but the width checks should be pretty spot on)

Answer 4

I've ended up with following solution:

function _fullscreenEnabled() {
    // FF provides nice flag, maybe others will add support for this later on?
    if(window['fullScreen'] !== undefined) {
      return window.fullScreen;
    }
    // 5px height margin, just in case (needed by e.g. IE)
    var heightMargin = 5;
    if($.browser.webkit && /Apple Computer/.test(navigator.vendor)) {
      // Safari in full screen mode shows the navigation bar, 
      // which is 40px  
      heightMargin = 42;
    }
    return screen.width == window.innerWidth &&
        Math.abs(screen.height - window.innerHeight) < heightMargin;
  }

Which works in every browser I care about (Chrome, FF, IE, Safari/Mac, Opera).

Update: It doesn't work on Opera/Mac, Opera on Mac while in full screen mode hides only the 'common' OSX menu, thus height differs only by few pixels which is too dangerous for me.

Answer 5

this works on major browsers (ie,ff,opera,chrome)

function isFullscreen(){

  if($.browser.opera){

    var fs=$('<div class="fullscreen"></div>');
    $('body').append(fs);

    var check=fs.css('display')=='block';
    fs.remove();

    return check;
  }

  var st=screen.top || screen.availTop || window.screenTop;

  if(st!=window.screenY){

    return false;
  }

  return window.fullScreen==true || screen.height-document.documentElement.clientHeight<=30;
}

css for opera:

.fullscreen { display: none; }

@media all and (view-mode: fullscreen){

  .fullscreen { display: block; }
}

Answer 6

Simple enough: Find the browser viewport using $(window).width() and $(window).height(), and if they conform to a set of defined viewport sizes (600 x 480, 1280 x 800, etc.), then you can know that it is most likely fullscreen. Also you can set event handlers for like the fll key and other possible shortcuts to define browser fullscreen.