The ifvisible.js from nvdnkpr

ifvisible.js's Introduction

ifvisible.js

Crosbrowser & lightweight way to check if user is looking at the page or interacting with it.

Check out the Demo or read below for code example or Check Annotated Sorce

// If page is visible right now
if( ifvisible.now() ){
	// Display pop-up
	openPopUp();
}

Handle tab switch or browser minimize states

ifvisible.on("blur", function(){
	// example code here..
	animations.pause();
});

ifvisible.on("focus", function(){
	// resume all animations
	animations.resume();
});

ifvisible.js can handle activity states too, such as being IDLE or ACTIVE on the page

ifvisible.on("idle", function(){
	// Stop auto updating the live data
	stream.pause();
});

ifvisible.on("wakeup", function(){
	// go back updating data
	stream.resume();
});

Default idle duration is 60 seconds but you can change it with setIdleDuration method

ifvisible.setIdleDuration(120); // Page will become idle after 120 seconds

You can manually trigger status events by calling them directly or you can set events with their names by giving first argument as a callback

ifvisible.idle(); // will put page in a idle status

ifvisible.idle(function(){
	// This code will work when page goes into idle status
});

// other methods are
ifvisible.blur();
ifvisible.focus();
ifvisible.idle();
ifvisible.wakeup();

You can set your smart intervals with ifvisible.js, if user is IDLE or not seeing the page the interval will automatically stop itself

// If page is visible run this function on every half seconds
ifvisible.onEvery(0.5, function(){
    // Do an animation on the logo only when page is visible
	animateLogo();

});

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