Animating float labels using jQuery and CSS3

http://thecodeplayer.com/walkthrough/animating-float-labels-jquery-css3 Float labels are cool for small screens and can be awesomely animated by breaking down the labels into individual characters and then playing around with it. In this walkthrough, when the user focuses on an input field individual letters are animated into an HTML fieldset like feel using jQuery.

by akshatha suchethan

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.3/jquery.easing.min.js"></script>
<main>
	<h1>Fieldset style float labels</h1>
	<form class="flp">
		<div>
			<input type="text" id="fname" />
			<label for="fname">First&nbsp;Name</label>
		</div>
		<div>
			<input type="text" id="email" />
			<label for="email">Email</label>
		</div>
	</form>
</main>

<!-- jQuery -->
<!--<script src="http://thecodeplayer.com/u/js/jquery-1.9.1.min.js" type="text/javascript"></script>-->
<!-- jQuery easing plugin for animation fun -->
<!--<script src="http://thecodeplayer.com/u/js/jquery.easing.min.js" type="text/javascript"></script>-->

CSS

/*importing Sniglet*/
@import url("http://fonts.googleapis.com/css?family=Sniglet");

/*basic reset*/
* {margin: 0; padding: 0; box-sizing: border-box;}

body {
	padding-top: 100px;
	background: hsl(120, 40%, 40%);
	font-family: Sniglet;
}
main {
	width: 500px; margin: 0 auto; padding-bottom: 10px;
	background: white; border-radius: 3px; overflow: hidden;
}
h1 {
	font-size: 24px; font-weight: normal;
	background: hsl(120, 40%, 95%); color: hsl(120, 40%, 40%);
	text-align: center; 
	padding: 20px 0; margin-bottom: 40px;
}

.flp {padding: 0 50px;}
/*Let's place the label over the input*/
.flp div {position: relative; margin-bottom: 30px;}

.flp input, .flp label {
	width: 400px; display: block;
	font: inherit; font-size: 16px; line-height: 24px;
	/*fixed height for FF line height issue. 
	height = 24(lineheight) + 10*2(padding) + 2(border)*/
	height: 46px;
	border: 1px solid #999;
}
.flp input {padding: 10px; outline: none; border-radius: 3px;}
.flp label {
	position: absolute; left: 0; top: 0;
	/*left/right padding will be 2px less, adjusted by padding on .ch*/
	padding: 10px 8px;
	border-color: transparent; color: #666;
	cursor: text;
}

/*label styles*/
.ch {
	display: block; float: left;
	position: relative; /*for upward animation*/
	background: white; 
}
.ch:first-child {padding-left: 2px;}
.ch:last-child {padding-right: 2px;}

/*active input label*/
.focussed {
	/*when any input is already focussed clicking on it(label) again won't do anything*/
	pointer-events: none;
}

JavaScript

//breakdown the labels into single character spans
$(".flp label").each(function() {
	var sop = '<span class="ch">'; //span opening
	var scl = '</span>'; //span closing
	//split the label into single letters and inject span tags around them
	//$(this).html(sop + $(this).html().split("").join(scl+sop) + scl);
    console.log($(this).html(), sop + $(this).html() + scl);
	$(this).html(sop + $(this).html() + scl);
	//to prevent space-only spans from collapsing
	$(".ch:contains(' ')").html("&nbsp;");
})

var d;
//animation time
$(".flp input").focus(function() {
	//calculate movement for .ch = half of input height
	var tm = $(this).outerHeight()/2 *-1 + "px";
	//label = next sibling of input
	//to prevent multiple animation trigger by mistake we will use .stop() before animating any character and clear any animation queued by .delay()
	$(this).next().addClass("focussed").children().stop(true).each(function(i) {
		d = i*50;//delay
		$(this).delay(d).animate({top: tm}, 200, 'easeOutBack');
	})
})
$(".flp input").blur(function(){
	//animate the label down if content of the input is empty
	if($(this).val() == "") {
		$(this).next().removeClass("focussed").children().stop(true).each(function(i) {
			d = i*50;
			$(this).delay(d).animate({top: 0}, 500, 'easeInOutBack');
		})
	}
})