Kambfhase/LICENSE.txt

## README.md

      
    Raw
  

              README.md
            
          
    I've been hanging around in the jQuery IRC-Channel today, when somebody came in and asked a simple question:
<simulation> how can i know if the page is on visible tab or passive tab ?

At first I thought this'd be impossible. Neither I there an API that I know of, nor should it be possible because of privacy. (Note: There are Fx internal APIs like tabs.focused)
Thankfully recently Browser vendors added the requestAnimationFrame function. We can use that to hack something together.
load the reqAF-shim: https://gist.github.com/997619 and save it to any variable, eg reqAF.

  
## annotated.js
function( c, r){
    // c: the callback
    // r: the requestAnimationFrame function
    setTimeout(function(){
        // if c is still defined, call it with the
        // param false and set c to false
        c&&c(c=!1)
    },50);
    r(function(){
        // if c is still defined, call it with the
        // param true and set c to 0( falsy)
        c&&c(!(c=0))
    })
}

## index.js
function(c,r){setTimeout(function(){c&&c(c=!1)},50);r(function(){c&&c(!(c=0))})}

## LICENSE.txt
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 Kambfhase

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

## package.json
{
  "name": "activity detection",

  "description": "detects if the user is looking at your page right now.",

  "keywords": [
    "five",
    "descriptive",
    "keywords",
    "or",
    "fewer"
  ]
}

## test.html
<!DOCTYPE html>
<title>detect activity</title>
<script>
var reqAF= function(a,b){while(a--&&!(b=this["oR0msR0mozR0webkitR0r".split(0)[a]+"equestAnimationFrame"]));return b||function(a){setTimeout(a,15)}}(5);

var active = function(c,r){setTimeout(function(){c&&c(c=!1)},50);r(function(){c&&c(!(c=0))})};

function checkLater(){
    setTimeout( function(){
        active(function( a){
            console.log( a);
        }, reqAF);
    }, 1000);
}

</script>
<a href="javascript: checkLater();">Check if this page is active. when in doubt, logs true.</a>
	function( c, r){
	// c: the callback
	// r: the requestAnimationFrame function
	setTimeout(function(){
	// if c is still defined, call it with the
	// param false and set c to false
	c&&c(c=!1)
	},50);
	r(function(){
	// if c is still defined, call it with the
	// param true and set c to 0( falsy)
	c&&c(!(c=0))
	})
	}
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 Kambfhase

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

	0. You just DO WHAT THE FUCK YOU WANT TO.
	{
	"name": "activity detection",

	"description": "detects if the user is looking at your page right now.",

	"keywords": [
	"five",
	"descriptive",
	"keywords",
	"or",
	"fewer"
	]
	}
	<!DOCTYPE html>
	<title>detect activity</title>
	<script>
	var reqAF= function(a,b){while(a--&&!(b=this["oR0msR0mozR0webkitR0r".split(0)[a]+"equestAnimationFrame"]));return b\|\|function(a){setTimeout(a,15)}}(5);

	var active = function(c,r){setTimeout(function(){c&&c(c=!1)},50);r(function(){c&&c(!(c=0))})};

	function checkLater(){
	setTimeout( function(){
	active(function( a){
	console.log( a);
	}, reqAF);
	}, 1000);
	}

	</script>
	<a href="javascript: checkLater();">Check if this page is active. when in doubt, logs true.</a>