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Native js and jQuery implement fade-in and fade-out carousel effect_jquery
Native js and jQuery implement fade-in and fade-out carousel effect_jquery
The example in this article introduces the key code for realizing the fade-in and fade-out carousel effect based on jQuery, and shares it with you for your reference. The specific content is as follows:
Basic principle: Position all pictures absolutely at the same position, set the transparency to 0, and then use jQuery's fade-in and fade-out to achieve the picture switching effect.
html code:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>一个轮播</title>
<style>
#scrollPlay{
width: 730px;
height: 336px;
/*overflow: hidden;*/
}
#pre{
position: absolute;
margin-top: 150px;
width:30px;
height: 30px;
background: #000;
color:#fff;
opacity: 0.7;
text-align: center;
line-height: 30px;
font-size: 20px;
z-index: 10;
}
img{
opacity: 0;
position: absolute;
}
#next{
position: absolute;
margin-left:700px;
margin-top: 150px;
width:30px;
height: 30px;
background: #000;
color:#fff;
opacity: 0.7;
text-align: center;
line-height: 30px;
font-size: 20px;
z-index: 10;
}
span{
display: block;
width: 15px;
height: 15px;
float: left;
border: 1px solid #fff;
}
#buttons{
position: absolute;
background: #000;
margin-top: 300px;
margin-left: 300px;
z-index: 10;
}
.onactive{
background: green;
}
</style>
<script src='jquery.js'></script>
<script src='index.js'></script>
</head>
<body>
<div id='scrollPlay'>
<div id='buttons'>
<span index = 0 class='onactive'></span>
<span index = 1></span>
<span index = 2></span>
<span index = 3></span>
<span index = 4></span>
</div>
<div id='pre'><</div>
<div id='next'>></div>
<img src='images/1.jpg' alt='pics' style='opacity:1'>
<img src='images/2.jpg' alt='pics'>
<img src='images/3.jpg' alt='pics'>
<img src='images/4.jpg' alt='pics'>
<img src='images/5.jpg' alt='pics'>
</div>
</body>
</html>
JS:
$(function(){
var index = 0;
var flag = false; //用于判断是否处于动画状态
//切换函数
function move(offset){
flag=true;
//console.log(offset)
$('img').eq(index).fadeOut('slow',function(){
if(offset>0){
if(index ==4){
index=0;
}else{
//console.log(index);
index=index+offset;
//console.log(index);
}
}
if(offset<0){
if(index==0){
index=4;
}else{
index=index+offset
}
}
$('img').eq(index).fadeTo('slow',1) //使用fadeIn不成功:$('img').eq(index).fadeIn('slow')
showButton();
flag=false;
});
}
//点击切换上一张
$('#pre').click(function(){
if(flag==false){
move(-1)
}
})
//点击切换下一张
$('#next').click(function(){
if(flag==false){
move(1)
}
})
//点击按钮直接切换
$('span').click(function(){
if(flag==false){
var i= $(this).attr('index')
//console.log(i)
//console.log(index)
//console.log(i-index)
move(i-index)
showButton();
}
})
//高亮显示按钮
function showButton(){
if($('span').hasClass('onactive')){
$('span').removeClass();
}
$('span').eq(index).addClass('onactive')
}
//自动播放
var timer;
function go(){
timer = setInterval(function(){
$('#next').trigger('click');
},3000)
}
//鼠标悬停，清除自动播放
$('#scrollPlay').mouseover(function(){
clearInterval(timer)
})
//鼠标移开，开始自动播放
$('#scrollPlay').mouseout(function(){
go();
})
go();
})
At the end of the article, I raised a small question for you, and I hope you can give me a solution.
There is no effect when using fadeIn to fade in. In the end, it can only be achieved by using fadeTo. What is the reason?
Let me share with you a small example: Native JS implements fade-in/fade-out effect (fadeIn/fadeOut/fadeTo)
The fade effect is often used in daily projects. Unfortunately, native JS does not have a similar method, and sometimes small pages are not worth introducing a jQuery library, so I wrote one myself. It is encapsulated and useful. Friends who have it can use it directly. There is also a method to set the transparency of elements in the code, which is set according to IE rules (0~100). If it is changed to the standard setting method (0.00~1.00), please consider floating when using it below. Point to express the difference accurately.
Parameter description:
Both fadeIn() and fadeOut() have three parameters. The first is the event, which is required; the second is the fade-in and fade-out speed, a positive integer, the size is weighed by yourself, and is optional; the third is the specified fade-in and fade-out point. Transparency value (similar to fadeTo() in jQuery), a positive integer value from 0 to 100, which is also an optional parameter.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>原生JS实现淡入淡出效果</title>
<style>
/*demo css*/
#demo div.box {float:left;width:31%;margin:0 1%}
#demo div.box h2{margin-bottom:10px}
#demo div.box h2 input{padding:5px 8px;font-size:14px;font-weight:bolder}
#demo div.box div{text-indent:10px; line-height:22px;border:2px solid #555;padding:0.5em;overflow:hidden}
</style>
<script>
window.onload = function(){
//底层共用
var iBase = {
Id: function(name){
return document.getElementById(name);
},
//设置元素透明度,透明度值按IE规则计,即0~100
SetOpacity: function(ev, v){
ev.filters ? ev.style.filter = 'alpha(opacity=' + v + ')' : ev.style.opacity = v / 100;
}
}
//淡入效果(含淡入到指定透明度)
function fadeIn(elem, speed, opacity){
/*
* 参数说明
* elem==>需要淡入的元素
* speed==>淡入速度,正整数(可选)
* opacity==>淡入到指定的透明度,0~100(可选)
*/
speedspeed = speed || 20;
opacityopacity = opacity || 100;
//显示元素,并将元素值为0透明度(不可见)
elem.style.display = 'block';
iBase.SetOpacity(elem, 0);
//初始化透明度变化值为0
var val = 0;
//循环将透明值以5递增,即淡入效果
(function(){
iBase.SetOpacity(elem, val);
val += 5;
if (val <= opacity) {
setTimeout(arguments.callee, speed)
}
})();
}
//淡出效果(含淡出到指定透明度)
function fadeOut(elem, speed, opacity){
/*
* 参数说明
* elem==>需要淡入的元素
* speed==>淡入速度,正整数(可选)
* opacity==>淡入到指定的透明度,0~100(可选)
*/
speedspeed = speed || 20;
opacityopacity = opacity || 0;
//初始化透明度变化值为0
var val = 100;
//循环将透明值以5递减,即淡出效果
(function(){
iBase.SetOpacity(elem, val);
val -= 5;
if (val >= opacity) {
setTimeout(arguments.callee, speed);
}else if (val < 0) {
//元素透明度为0后隐藏元素
elem.style.display = 'none';
}
})();
}
var btns = iBase.Id('demo').getElementsByTagName('input');
btns[0].onclick = function(){
fadeIn(iBase.Id('fadeIn'));
}
btns[1].onclick = function(){
fadeOut(iBase.Id('fadeOut'),40);
}
btns[2].onclick = function(){
fadeOut(iBase.Id('fadeTo'), 20, 10);
}
}
</script>
</head>
<body>
<!--DEMO start-->
<div id="demo">
<div class="box">
<h2><input type="button" value="点击淡入" /></h2>
<div id="fadeIn" style="display:none">
<p>脚本之家</p>
<p>www.jb51.net</p>
</div>
<p>脚本之家是国内专业的网站建设资源.</p>
</div>
<div class="box">
<h2><input type="button" value="点击淡出" /></h2>
<div id="fadeOut">
<p>脚本之家</p>
<p>www.jb51.net</p>
</div>
<p>脚本之家是国内专业的网站建设资源.</p>
</div>
<div class="box">
<h2><input type="button" value="点击淡出至指定透明度" /></h2>
<div id="fadeTo">
</div>
<p>脚本之家是国内专业的网站建设资源.</p>
</div>
</div>
<!--DEMO end-->
</body>
</html>
The above is the entire content of this article. I hope it will be helpful for everyone to learn native js and jQuery to achieve the fade-in and fade-out carousel effect.
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