Creating a Cool Thumbnail Proximity Effect with jQuery and CSS3
Here’s another awesome tutorial by Mary Lou and it’s about how to create a neat thumbnail proximity effect with jQuery.
To start with, here’s the markup:
<ul id="pe-thumbs" class="pe-thumbs">
<li>
<a href="#">
<img src="images/thumbs/1.jpg" />
<div class="pe-description">
<h3>Time</h3>
<p>Since time, and his predestinated end</p>
</div></a>
</li>
<li><!-- ... --></li>
</ul>
Styling:
CSS
Adding background image to “shine through” the thumbnails that will have a low opacity:
.pe-thumbs{
width: 900px;
height: 400px;
margin: 20px auto;
position: relative;
background: transparent url(../images/3.jpg) top center;
border: 5px solid #fff;
box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}
Add tint to background image using pseudo element with rgba background color:
.pe-thumbs:before {
content: "";
display: block;
position: absolute;
top: 0px;
left: 0px;
width: 100%;
height: 100%;
background: rgba(255,102,0,0.2);
}
Setting the position of anchors and images to relative:
.pe-thumbs li{
float: left;
position: relative;
}
.pe-thumbs li a,
.pe-thumbs li a img{
display: block;
position: relative;
}
Initial width of 100px for each thumbnail and opacity of 0.2:
.pe-thumbs li a img{
width: 100px;
opacity: 0.2;
}
By default, the description will be hidden, and using JavaScript, it will reappear.
.pe-thumbs li a div.pe-description{
width: 200px;
height: 100px;
background: rgba(0,0,0,0.8);
position: absolute;
top: 0px;
left: -200px;
color: white;
display: none;
z-index: 1001;
text-align: left;
}
Styling content of description division:
.pe-description h3{
padding: 10px 10px 0px 10px;
line-height: 20px;
font-family: 'BebasNeueRegular', 'Arial Narrow', Arial, sans-serif;
font-size: 22px;
margin: 0px;
}
.pe-description p{
padding: 10px 0px;
margin: 10px;
font-size: 11px;
font-style: italic;
border-top: 1px solid rgba(255,255,255,0.3);
}
JavaScript
// list of thumbs
var $list = $('#pe-thumbs'),
// list's width and offset left.
// this will be used to know the position of the description container
listW = $list.width(),
listL = $list.offset().left,
// the images
$elems = $list.find('img'),
// the description containers
$descrp = $list.find('div.pe-description'),
// maxScale : maximum scale value the image will have
// minOpacity / maxOpacity : minimum (set in the CSS) and maximum values for the image's opacity
settings = {
maxScale : 1.3,
maxOpacity : 0.9,
minOpacity : Number( $elems.css('opacity') )
},
init = function() {
// minScale will be set in the CSS
settings.minScale = _getScaleVal() || 1;
// preload the images (thumbs)
_loadImages( function() {
_calcDescrp();
_initEvents();
});
},
// Get Value of CSS Scale through JavaScript:
// http://css-tricks.com/get-value-of-css-rotation-through-javascript/
_getScaleVal= function() {
var st = window.getComputedStyle($elems.get(0), null),
tr = st.getPropertyValue("-webkit-transform") ||
st.getPropertyValue("-moz-transform") ||
st.getPropertyValue("-ms-transform") ||
st.getPropertyValue("-o-transform") ||
st.getPropertyValue("transform") ||
"fail...";
if( tr !== 'none' ) {
var values = tr.split('(')[1].split(')')[0].split(','),
a = values[0],
b = values[1],
c = values[2],
d = values[3];
return Math.sqrt( a * a + b * b );
}
},
// calculates the style values for the description containers,
// based on the settings variable
_calcDescrp = function() {
$descrp.each( function(i) {
var $el = $(this),
$img = $el.prev(),
img_w = $img.width(),
img_h = $img.height(),
img_n_w = settings.maxScale * img_w,
img_n_h = settings.maxScale * img_h,
space_t = ( img_n_h - img_h ) / 2,
space_l = ( img_n_w - img_w ) / 2;
$el.data( 'space_l', space_l ).css({
height : settings.maxScale * $el.height(),
top : -space_t,
left : img_n_w - space_l
});
});
},
_initEvents = function() {
$elems.on('proximity.Photo', { max: 80, throttle: 10, fireOutOfBounds : true }, function(event, proximity, distance) {
var $el = $(this),
$li = $el.closest('li'),
$desc = $el.next(),
scaleVal = proximity * ( settings.maxScale - settings.minScale ) + settings.minScale,
scaleExp = 'scale(' + scaleVal + ')';
// change the z-index of the element once
// it reaches the maximum scale value
// also, show the description container
if( scaleVal === settings.maxScale ) {
$li.css( 'z-index', 1000 );
if( $desc.offset().left + $desc.width() > listL + listW ) {
$desc.css( 'left', -$desc.width() - $desc.data( 'space_l' ) );
}
$desc.fadeIn( 800 );
}
else {
$li.css( 'z-index', 1 );
$desc.stop(true,true).hide();
}
$el.css({
'-webkit-transform' : scaleExp,
'-moz-transform' : scaleExp,
'-o-transform' : scaleExp,
'-ms-transform' : scaleExp,
'transform' : scaleExp,
'opacity' : ( proximity * ( settings.maxOpacity - settings.minOpacity ) + settings.minOpacity )
});
});
},
_loadImages = function( callback ) {
var loaded = 0,
total = $elems.length;
$elems.each( function(i) {
var $el = $(this);
$('<img>').load( function() {
++loaded;
if( loaded === total )
callback.call();
}).attr( 'src', $el.attr('src') );
});
};
return {
init : init
};
Click on the image to see full tutorial.
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