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分享一个JQuery写的点击上下滚动的小例子

2016-03-31 20:25 891 查看
效果图
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>demo</title>
<script src="http://libs.baidu.com/jquery/1.7.2/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
if (typeof jQuery == 'undefined') {
document.write(unescape("%3Cscript src='./js/jquery-1.7.2.js' type='text/javascript'%3E%3C/script%3E"));
}
</script>
<style type="text/css">
/*全局控制*/
body{margin:0;padding:0;font-size:12px;font-family:"微软雅黑";-webkit-text-size-adjust:none;min-width: 1200px;}
html,body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td,p{margin:0;padding:0;}
input,select,textarea{font-size:12px;line-height:16px;}img{border:0;}ul,li{list-style-type:none;}
a{color:#333;text-decoration:none;}
a:hover{text-decoration:underline;}
/*显示样式*/
.tab_type li {background-color: #DDDEDC;width: 86px;line-height: 34px;text-align: center;margin-bottom: 1px;}
.tab_type li a{ display: block; font-weight: bold;}
.tab_type li a:hover{text-decoration: none;background-color:#D3B92A;}
.tab_type li span{margin:0 2px;}
.t_f{position: relative;top: -9px;font-size: 14px;}
.t_n{font-size: 18px;}
/*重要样式*/
#scrollDiv{width: 86px;height: 185px;min-height: 25px;overflow: hidden;}
</style>
<script type="text/javascript">
/*重要脚本*/
(function ($) {
$.fn.extend({
Scroll: function (opt, callback) {
if (!opt) var opt = {};
var _btnUp = $("#" + opt.up); //Shawphy:向上按钮
var _btnDown = $("#" + opt.down); //Shawphy:向下按钮
var _this = this.eq(0).find("ul:first");
var lineH = _this.find("li:first").height()+1; //获取行高  此处我加了1 因为样式中用到了margin-bottom:1px 这个根据自己情况修改
var line = opt.line ? parseInt(opt.line, 10) : parseInt(this.height() / lineH, 10); //每次滚动的行数，默认为一屏，即父容器高度
var speed = opt.speed ? parseInt(opt.speed, 10) : 600; //卷动速度，数值越大，速度越慢（毫秒）
var m = 0;  //用于计算的变量
var count = _this.find("li").length; //总共的<li>元素的个数
var upHeight = line * lineH;
var showline = opt.showline;//显示多少行
function scrollUp() {
if (!_this.is(":animated")) {  //判断元素是否正处于动画，如果不处于动画状态，则追加动画。
if (m < count) {  //判断 m 是否小于总的个数
var go_count = count-m-showline;
if((count-m)>showline){
if(go_count<line){
m += go_count;
upHeight =  go_count * lineH;
_this.animate({ marginTop: "-=" + upHeight + "px" }, speed);
}else{
m += line;
upHeight =  line * lineH;
_this.animate({ marginTop: "-=" + upHeight + "px" }, speed);
}
}else{

}
}
}
}
function scrollDown() {
if (!_this.is(":animated")) {
if(m>0){
if (m > line) { //判断m 是否大于一屏个数
m -= line;
upHeight =  line * lineH;
_this.animate({ marginTop: "+=" + upHeight + "px" }, speed);
}else{
upHeight =  m * lineH;
m -= m;
_this.animate({ marginTop: "+=" + upHeight + "px" }, speed);
}
}
}
}
_btnUp.bind("click", scrollUp);
_btnDown.bind("click", scrollDown);
}
});
})(jQuery);
$(function () {
$("#scrollDiv").Scroll({ line: 2, speed: 500,up: "btn1", down: "btn2",showline:5 });
});
</script>
</head>
<body>
<div class="tab_type">
<!--核心代码 开始-->
<div id="scrollDiv">
<ul>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">36</span><span class="">mm</span></a></li>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">38</span><span class="">mm</span></a></li>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">40</span><span class="">mm</span></a></li>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">52</span><span class="">mm</span></a></li>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">60</span><span class="">mm</span></a></li>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">70</span><span class="">mm</span></a></li>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">80</span><span class="">mm</span></a></li>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">92</span><span class="">mm</span></a></li>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">120</span><span class="">mm</span></a></li>
<li><a href="javascript:"><span class="t_f">□</span><span class="t_n">130</span><span class="">mm</span></a></li>
</ul>
</div>
<input type="button" id="btn1" value="上滚" />
<input type="button" id="btn2" value="下滚" />
<!--核心代码 结束-->
</div>

</body>
</html>
转载自:http://www.9958.pw/post/jquery_up_and_down
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