Jquery code to achieve image carousel effect (1)_javascript skills
The article is not well written, so I would like to ask experts for advice. Without further ado, let’s take a look at the rendering:
Online demo Download source code
The first is the initialization part: hide all pictures except the first carousel picture, hide the forward and backward buttons, and make the first index button active.
Event part: Bind the mouse up and leave event processing through jquery's hover() method. jquery's bind() method binds the mouse click event processing for forward, backward flipping, and carousel control: pre() , next(), play(), start() starts automatic rotation, and stop() stops automatic rotation.
The next article is a pure jquery carousel plug-in, which can customize various effects, convenient configuration and extensibility.
The following is the overall code:
index.html
[html] view plaincopy
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>jquery轮播效果图 </title>
<script type="text/javascript" src="scripts/jquery-1.9.1.js"></script>
<style type="text/css">
* {
padding: 0px;
margin: 0px;
}
a {
text-decoration: none;
}
ul {
list-style: outside none none;
}
.slider, .slider-panel img, .slider-extra {
width: 650px;
height: 413px;
}
.slider {
text-align: center;
margin: 30px auto;
position: relative;
}
.slider-panel, .slider-nav, .slider-pre, .slider-next {
position: absolute;
z-index: 8;
}
.slider-panel {
position: absolute;
}
.slider-panel img {
border: none;
}
.slider-extra {
position: relative;
}
.slider-nav {
margin-left: -51px;
position: absolute;
left: 50%;
bottom: 4px;
}
.slider-nav li {
background: #3e3e3e;
border-radius: 50%;
color: #fff;
cursor: pointer;
margin: 0 2px;
overflow: hidden;
text-align: center;
display: inline-block;
height: 18px;
line-height: 18px;
width: 18px;
}
.slider-nav .slider-item-selected {
background: blue;
}
.slider-page a{
background: rgba(0, 0, 0, 0.2);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#33000000,endColorstr=#33000000);
color: #fff;
text-align: center;
display: block;
font-family: "simsun";
font-size: 22px;
width: 28px;
height: 62px;
line-height: 62px;
margin-top: -31px;
position: absolute;
top: 50%;
}
.slider-page a:HOVER {
background: rgba(0, 0, 0, 0.4);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#66000000,endColorstr=#66000000);
}
.slider-next {
left: 100%;
margin-left: -28px;
}
</style>
<script type="text/javascript">
$(document).ready(function() {
var length,
currentIndex = 0,
interval,
hasStarted = false, //是否已经开始轮播
t = 3000; //轮播时间间隔
length = $('.slider-panel').length;
//将除了第一张图片隐藏
$('.slider-panel:not(:first)').hide();
//将第一个slider-item设为激活状态
$('.slider-item:first').addClass('slider-item-selected');
//隐藏向前、向后翻按钮
$('.slider-page').hide();
//鼠标上悬时显示向前、向后翻按钮,停止滑动，鼠标离开时隐藏向前、向后翻按钮，开始滑动
$('.slider-panel, .slider-pre, .slider-next').hover(function() {
stop();
$('.slider-page').show();
}, function() {
$('.slider-page').hide();
start();
});
$('.slider-item').hover(function(e) {
stop();
var preIndex = $(".slider-item").filter(".slider-item-selected").index();
currentIndex = $(this).index();
play(preIndex, currentIndex);
}, function() {
start();
});
$('.slider-pre').unbind('click');
$('.slider-pre').bind('click', function() {
pre();
});
$('.slider-next').unbind('click');
$('.slider-next').bind('click', function() {
next();
});
/**
* 向前翻页
*/
function pre() {
var preIndex = currentIndex;
currentIndex = (--currentIndex + length) % length;
play(preIndex, currentIndex);
}
/**
* 向后翻页
*/
function next() {
var preIndex = currentIndex;
currentIndex = ++currentIndex % length;
play(preIndex, currentIndex);
}
/**
* 从preIndex页翻到currentIndex页
* preIndex 整数，翻页的起始页
* currentIndex 整数，翻到的那页
*/
function play(preIndex, currentIndex) {
$('.slider-panel').eq(preIndex).fadeOut(500)
.parent().children().eq(currentIndex).fadeIn(1000);
$('.slider-item').removeClass('slider-item-selected');
$('.slider-item').eq(currentIndex).addClass('slider-item-selected');
}
/**
* 开始轮播
*/
function start() {
if(!hasStarted) {
hasStarted = true;
interval = setInterval(next, t);
}
}
/**
* 停止轮播
*/
function stop() {
clearInterval(interval);
hasStarted = false;
}
//开始轮播
start();
});
</script>
</head>
<body>
<div class="slider">
<ul class="slider-main">
<li class="slider-panel">
<a href="http://www.jb51.net" target="_blank"><img src="/static/imghw/default1.png" data-src="images/1.jpg" class="lazy" alt="Jquery code to achieve image carousel effect (1)_javascript skills" title="Jquery code to achieve image carousel effect (1)_javascript skills"></a>
</li>
<li class="slider-panel">
<a href="http://www.jb51.net" target="_blank"><img src="/static/imghw/default1.png" data-src="images/2.jpg" class="lazy" alt="Jquery code to achieve image carousel effect (1)_javascript skills" title="Jquery code to achieve image carousel effect (1)_javascript skills"></a>
</li>
<li class="slider-panel">
<a href="http://www.jb51.net" target="_blank"><img src="/static/imghw/default1.png" data-src="images/3.jpg" class="lazy" alt="Jquery code to achieve image carousel effect (1)_javascript skills" title="Jquery code to achieve image carousel effect (1)_javascript skills"></a>
</li>
<li class="slider-panel">
<a href="http://www.jb51.net" target="_blank"><img src="/static/imghw/default1.png" data-src="images/4.jpg" class="lazy" alt="Jquery code to achieve image carousel effect (1)_javascript skills" title="Jquery code to achieve image carousel effect (1)_javascript skills"></a>
</li>
</ul>
<div class="slider-extra">
<ul class="slider-nav">
<li class="slider-item">1</li>
<li class="slider-item">2</li>
<li class="slider-item">3</li>
<li class="slider-item">4</li>
</ul>
<div class="slider-page">
<a class="slider-pre" href="javascript:;;"><</a>
<a class="slider-next" href="javascript:;;">></a>
</div>
</div>
</div>
</body>
</html>At this point, a simple jquery carousel effect is completed. Of course, there are still many areas for improvement.
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