1. Code an event handler for the click event of the <a> elements in the list. Th
ID: 3674410 • Letter: 1
Question
1. Code an event handler for the click event of the <a> elements in the list. This event handler should start by getting the URL for the image to be displayed. Then, it should assign this URL to the enlarged image.
2. Add animation to the click event handler so the opacity of the current image is set to 0 and 205 is subtracted from the left margin of the image over a period of 1 second. Use a callback function to reverse this animation. This function should also contain the statement that sets the URL for the enlarged image. The effect will be for the current image to fade out as it slides to the left, and then for the new image to fade in as it slides to the right.
JS
$(document).ready(function() {
var slider = $("#image_list"); // slider = ul element
var leftProperty, newleftProperty;
// the click event handler for the right button
$("#right_button").click(function() {
// get value of current left property
leftProperty = parseInt(slider.css("left"));
// determine new value of left property
if (leftProperty - 300 <= -900) {
newLeftProperty = 0; }
else {
newLeftProperty = leftProperty - 300; }
// use the animate function to change the left property
slider.animate( {left: newLeftProperty}, 1000);
}); // end click
// the click event handler for the left button
$("#left_button").click(function() {
// get value of current right property
leftProperty = parseInt(slider.css("left"));
// determine new value of left property
if (leftProperty < 0) {
newLeftProperty = leftProperty + 300;
}
else {
newLeftProperty = 0;
}
// use the animate function to change the left property
slider.animate( {left: newLeftProperty}, 1000);
}); // end click
}); // end ready
HTML
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Carousel Animation</title>
<link rel="stylesheet" href="main.css">
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<script src="http://code.jquery.com/jquery-1.8.3.min.js"></script>
<script src="carousel.js"></script>
</head>
<body>
<section>
<h1>View our Books</h1>
<img id="image" src="images/book1.jpg" alt="SQL Server 2008 for Developers">
<div id="carousel">
<div id="left_button" class="button_panel"><img src="images/left.jpg" alt=""></div>
<div id="display_panel">
<ul id="image_list">
<li><a href="images/book1.jpg"><img src="images/book1.jpg" alt="SQL Server 2008 for Developers"></a></li>
<li><a href="images/book2.jpg"><img src="images/book2.jpg" alt="PHP and MySQL"></a></li>
<li><a href="images/book3.jpg"><img src="images/book3.jpg" alt="Visual Basic 2010"></a></li>
<li><a href="images/book4.jpg"><img src="images/book4.jpg" alt="ADO.NET 4 database programming with VB 2010"></a></li>
<li><a href="images/book5.jpg"><img src="images/book5.jpg" alt="ASP.NET 4 web programming with VB 2010"></a></li>
<li><a href="images/book6.jpg"><img src="images/book6.jpg" alt="Oracle SQL and PL/SQL"></a></li>
<li><a href="images/book7.jpg"><img src="images/book7.jpg" alt="Java Servlets and JSP"></a></li>
<li><a href="images/book8.jpg"><img src="images/book8.jpg" alt="C# 2010"></a></li>
<li><a href="images/book9.jpg"><img src="images/book9.jpg" alt="ASP.NET 4 web programming with C# 2010"></a></li>
</ul>
</div>
<div id="right_button" class="button_panel"><img src="images/right.jpg" alt=""></div>
</div>
</section>
</body>
</html>
CSS
article, aside, figure, footer, header, nav, section {
display: block;
}
* {
margin: 0;
padding: 0;
}
body {
font-family: Arial, Helvetica, sans-serif;
font-size: 85%;
margin: 0 auto;
width: 410px;
height: 480px;
border: 2px solid blue;
}
section {
padding: 20px 0;
}
h1 {
font-size: 140%;
text-align: center;
margin-bottom: .5em;
}
#image {
height: 250px;
margin-bottom: 1em;
margin-left: 105px;
}
/* the styles for the carousel */
.button_panel {
height: 125px;
padding: 50px 15px;
float: left;
}
.button_panel img {
width: 25px;
height: 25px;
}
#display_panel {
height: 125px;
width: 300px;
overflow: hidden;
float: left;
}
#image_list {
left: 0px;
position: relative;
width: 900px;
list-style: none;
}
#image_list li {
float: left;
width: 100px;
}
#image_list li img {
width: 95px;
}
Explanation / Answer
The HTML
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The CSS
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