【jQuery学习日记】jQuery实现滚动动画
需要实现的效果
样式分析:
2个主要部分,头部的标题和导航部分,和主要的功能实现区域;
1.头部
<div id="header"> <h1>动漫视频</h1> <span><</span> <span>></span> </div> <div id="tips"> <span class="on"> </span> <span> </span> <span> </span> </div>
2.功能区域
<div id="viewBox"> <ul id="contentBox"> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> <li>6</li> <li>7</li> <li>8</li> <li>9</li> <li>10</li> <li>11</li> <li>12</li> </ul> </div>
添加样式
<style> #header{ display: inline-block; } #header h1{ display: inline-block; font-size: 32px; padding-left: 20px; } #header span{ width: 30px; height: 30px; display: inline-block; font-size: 23px; cursor:pointer; border: 1px solid #eee; border-radius: 3px; text-align: center; } #header span:hover{ background: #333; color: #fff; } #viewBox{ width: 960px; height: 140px; font-size: 0; overflow: hidden; border: 1px solid #333; } #contentBox{ width: 2880px; position: relative; } #contentBox>li{ width: 200px; height: 100px; background: pink; display: inline-block; font-size: 12px; margin: 20px; } #tips{ display: inline-block; } #tips span{ display: inline-block; width: 20px; height: 20px; border-radius: 20px; text-align: center; line-height: 20px; border: 1px solid #eee; cursor: pointer; } #tips span:hover{ background: #999; color: white; } #tips span.on{ background: black; color: white; } </style>
此处需要注意,因为需要给 contentBox 添加 animate left 方法,所以需要给它的 position : related 才能使 animate left 生效
功能分析:
1.下一页
2.当下一页滚动到最后一页面,再点击下一页的时候,需要返回到第一页
3.上一页
4.当上一页滚动到第一页,再点击上一页的时候,需要前进到最后一页
5.当点击圆圈的时候,前进到任意一页
功能实现
首先,我们在接下来的功能中常用的一些元素,先赋值给变量
$vBox = $('#viewBox'); /* 可以见到的展示区域 */ $cBox = $('#contentBox'); /* 内容区域 */ vWidth = $vBox.width(); /* 可见区域的宽度 */ cWidth = $cBox.width(); /* 内容区域的宽度 */
然后,我们有5个小功能,下一页(goNext),回到顶部(goTop),上一页(goBack),回到底部(goBotoom),到任意页(goPage)
1.下一页(goNext)
var vLeft=$cBox.position().left; //内容区域距左侧的距离 $cBox.animate({left: '-='+vWidth+'px'});
2.回到顶部(goTop)
var vLeft=$cBox.position().left; $cBox.animate({left: 0});
3.上一页(goBack)
var vLeft=$cBox.position().left; //内容区域距左侧的距离 $cBox.animate({left: '+='+vWidth+'px'});
4.回到底部(goBotoom)
var vLeft=$cBox.position().left; //内容区域距左侧的距离 $cBox.animate({left: -cWidth+vWidth});
5.到任意页(goPage)
var vLeft=$cBox.position().left; //内容区域距左侧的距离 $cBox.animate({left: -vWidth*page}); //传递一个page参数用来知道需要跳转到第几页
当每个小功能实现后,组合下功能,并绑定功能
var $vBox; var $cBox; var vWidth; var cWidth; $(function () { $vBox = $('#viewBox'); $cBox = $('#contentBox'); vWidth = $vBox.width(); cWidth = $cBox.width(); $('#header span:last-child').click(function () { go('next'); }) $('#header span:nth-child(2)').click(function () { go('back'); }) $('#tips>span').click(function () { var $ThisS=$(this); $ThisS.addClass('on').siblings().removeClass(); go($ThisS.index()); }) }) function go(page) { var vLeft=$cBox.position().left; if (!$cBox.is(':animated')){ switch (page){ case 'next': if( vLeft > -cWidth-vLeft ){ $cBox.animate({left: '-='+vWidth+'px'}); }else{ go('top'); } break; case 'back': if( vLeft < 0){ $cBox.animate({left: '+='+vWidth+'px'}); }else{ go('bottom'); } break; case 'top': $cBox.animate({left: 0}); break; case 'bottom': $cBox.animate({left: -cWidth+vWidth}); break; default: $cBox.animate({left: -vWidth*page}); break; } } }
下面是全部代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>第一个页面</title> <!--<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no">--> <script src="common/js/jquery-2.1.1.min.js"></script> <!--<script src="common/js/screenAdaptation.js"></script>--> <script src="js/download.js"></script> <script src="js/stopXBack.js"></script> <link rel="stylesheet" href="common/css/common-style.css?v=<%=Math.random()*100 %>"> <link rel="stylesheet" href="css/download.css?v=<%=Math.random()*100 %>"> <style> #header{ display: inline-block; } #header h1{ display: inline-block; font-size: 32px; padding-left: 20px; } #header span{ width: 30px; height: 30px; display: inline-block; font-size: 23px; cursor:pointer; border: 1px solid #eee; border-radius: 3px; text-align: center; } #header span:hover{ background: #333; color: #fff; } #viewBox{ width: 960px; height: 140px; font-size: 0; overflow: hidden; border: 1px solid #333; } #contentBox{ width: 2880px; position: relative; } #contentBox>li{ width: 200px; height: 100px; background: pink; display: inline-block; font-size: 12px; margin: 20px; } #tips{ display: inline-block; } #tips span{ display: inline-block; width: 20px; height: 20px; border-radius: 20px; text-align: center; line-height: 20px; border: 1px solid #eee; cursor: pointer; } #tips span:hover{ background: #999; color: white; } #tips span.on{ background: black; color: white; } </style> <script> var $vBox; var $cBox; var vWidth; var cWidth; $(function () { $vBox = $('#viewBox'); $cBox = $('#contentBox'); vWidth = $vBox.width(); cWidth = $cBox.width(); $('#header span:last-child').click(function () { go('next'); }) $('#header span:nth-child(2)').click(function () { go('back'); }) $('#tips>span').click(function () { var $ThisS=$(this); $ThisS.addClass('on').siblings().removeClass(); go($ThisS.index()); }) }) function go(page) { var vLeft=$cBox.position().left; if (!$cBox.is(':animated')){ switch (page){ case 'next': if( vLeft > -cWidth-vLeft ){ $cBox.animate({left: '-='+vWidth+'px'}); }else{ go('top'); } break; case 'back': if( vLeft < 0){ $cBox.animate({left: '+='+vWidth+'px'}); }else{ go('bottom'); } break; case 'top': $cBox.animate({left: 0}); break; case 'bottom': $cBox.animate({left: -cWidth+vWidth}); break; default: $cBox.animate({left: -vWidth*page}); break; } } } </script> </head> <body> <div id="header"> <h1>动漫视频</h1> <span><</span> <span>></span> </div> <div id="tips"> <span class="on"> </span> <span> </span> <span> </span> </div> <div id="viewBox"> <ul id="contentBox"> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> <li>6</li> <li>7</li> <li>8</li> <li>9</li> <li>10</li> <li>11</li> <li>12</li> </ul> </div> </body> </html>
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