jQuery Thumbnail with Zooming Image and Fading Caption Tutorial

11 January 2010 Monday

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jQuery Thumbnail with Zooming Image and Fading Caption Tutorial

Learn how to build thumbnail gallery with zooming effect and fadein and fadeout caption. This tutorial will walk you through the concept behind it and how to code it.

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Introduction

I came across quite a lot of CSS gallery websites that using huge thumbnail to showcase beautiful websites. Some of them are just ordinary thumbnail, but a lot of them have javascript animated caption to convey more information to viewers. In this tutorial, we will learn how to make ordinary thumbnail to something more. This is my second tutorial about thumbnail gallery, if you missed the first one, you might want to read it later - Create a thumbnail gallery with slick heading and caption effect.

1. HTML

<div class="zitem">
<a href="#"><img src="1.jpg" alt="Test 1" title="" width="125" height="125"/></a>
<div class="caption">
<a href="">Test 1</a>
</div>
</div>
<div class="zitem">
<a href="#"><img src="2.gif" alt="Test 2" title="" width="125" height="125"/></a>
<div class="caption">
<a href="">Test 2</a>
</div>
</div>
<div class="zitem">
<a href="#"><img src="3.png" alt="Test 3" title="" width="125" height="125"/></a>
<div class="caption">
<a href="">Test 3</a>
</div>
</div>

<div class="zitem">
	<a href="#"><img src="1.jpg" alt="Test 1" title="" width="125" height="125"/></a>
	<div class="caption">
		<a href="">Test 1</a>

	</div>
</div>

<div class="zitem">
	<a href="#"><img src="2.gif" alt="Test 2" title="" width="125" height="125"/></a>
	<div class="caption">
		<a href="">Test 2</a>

	</div>
</div>

<div class="zitem">
	<a href="#"><img src="3.png" alt="Test 3" title="" width="125" height="125"/></a>
	<div class="caption">
		<a href="">Test 3</a>

	</div>
</div>

2. CSS

I have added inline comment in the following CSS code. If you want to learn more about CSS, read my previous post 15 CSS Tips and Tricks or, you want to know MORE ABOUT CSS, read my new post - 15 Ways to Optimize CSS and Reduce CSS File Size

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.zitem {
width:125px;
height:125px;
border:4px solid #222;
margin:5px 5px 5px 0;
/* required to hide the image after resized */
overflow:hidden;
/* for child absolute position */
position:relative;
/* display div in line */
float:left;
}
.zitem .caption {
width:125px;
height:30px;
background:#000;
color:#fff;
/* fix it at the bottom */
position:absolute;
bottom:-1px; /* fix IE issue */
left:0;
/* hide it by default */
display:none;
/* opacity setting */
filter:alpha(opacity=70); /* ie */
-moz-opacity:0.7; /* old mozilla browser like netscape */
-khtml-opacity: 0.7; /* for really really old safari */
opacity: 0.7; /* css standard, currently it works in most modern browsers like firefox, */
}
.zitem .caption a {
text-decoration:none;
color:#fff;
font-size:12px;
/* add spacing and make the whole row clickable*/
padding:5px;
display:block;
}
img {
border:0;
/* allow javascript moves the img position*/
position:absolute;
}

.zitem {
	width:125px;
	height:125px;	
	border:4px solid #222;	
	margin:5px 5px 5px 0;
	
	/* required to hide the image after resized */
	overflow:hidden;
	
	/* for child absolute position */
	position:relative;
	
	/* display div in line */
	float:left;
}

.zitem .caption {
	width:125px;
	height:30px;
	background:#000;
	color:#fff;
		
	/* fix it at the bottom */
	position:absolute;
	bottom:-1px; /* fix IE issue */
	left:0;

	/* hide it by default */
	display:none;

	/* opacity setting */
	filter:alpha(opacity=70);    /* ie  */
	-moz-opacity:0.7;    /* old mozilla browser like netscape  */
	-khtml-opacity: 0.7;    /* for really really old safari */  
	opacity: 0.7;    /* css standard, currently it works in most modern browsers like firefox,  */

}

.zitem .caption a {
	text-decoration:none;
	color:#fff;
	font-size:12px;	
	
	/* add spacing and make the whole row clickable*/
	padding:5px;
	display:block;
}

img {
	border:0;
	
	/* allow javascript moves the img position*/
	position:absolute;
}

3. Javascript

This is a simple jQuery script with hover effect. What we have to do is calculate the width and height and set it to the image.

$(document).ready(function() {
//move the image in pixel
var move = -15;
//zoom percentage, 1.2 =120%
var zoom = 1.2;
//On mouse over those thumbnail
$(´.zitem´).hover(function() {
//Set the width and height according to the zoom percentage
width = $(´.zitem´).width() * zoom;
height = $(´.zitem´).height() * zoom;
//Move and zoom the image
$(this).find(´img´).stop(false,true).animate({´width´:width, ´height´:height, ´top´:move, ´left´:move}, {duration:200});
//Display the caption
$(this).find(´div.caption´).stop(false,true).fadeIn(200);
},
function() {
//Reset the image
$(this).find(´img´).stop(false,true).animate({´width´:$(´.zitem´).width(), ´height´:$(´.zitem´).height(), ´top´:´0´, ´left´:´0´}, {duration:100});
//Hide the caption
$(this).find(´div.caption´).stop(false,true).fadeOut(200);
});
});