瀑布流AJAX无刷新加载数据列表--当页面滚动到Id时再继续加载数据
瀑布流加载显示数据，在当下已经用的很普遍，尤其是我们在做网上商城时，在产品列表页面已经被普遍使用。
对于实现瀑布流布局的解决方案主要有以下两种方式：
1、对每一条显示数据使用绝对定位+浮动的方式，这样也会有一个问题----必须要知道每一条信息的具体高宽度
2、采用列布局，将每一条数据依次放置到每一列
其实两者的实现原理都是大同小异，现在我将针对第二种解决方案，用一个具体的事例来说明
<!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>
<title></title>
<style type="text/css">
body,ul,li{margin:0;margin:0;}
ul{list-style:none;}
.clearfix:after{visibility:hidden;display:block;font-size:0;content:" ";clear:both; height:0;}.clearfix{*zoom:1}
/*瀑布流*/
/*.wallList{width:860px;}*/
.wallList li{float:left;display:inline;margin-right:16px;}
.wallList li a{background:#eee;border:1px solid #ccc;padding:5px 5px 0 5px;display:block;margin-bottom:10px;}
.wallList li a:hover{border-color:#f60;}
.wallList li .name{display:block;text-align:center;padding:8px 0;}
.loadTips{text-align:center;padding:15px 0;}
</style>
</head>
<body>
<div class="wallList" id="wallList">
<ul class="clearfix">
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
<p class="loadTips" id="loadTips">
19880902 <span>正在加载......</span></p>
</div>
</body>
</html>
<script src="jquery-1.7.1.js" type="text/javascript"></script>
<script type="text/javascript">
// 数据格式
var testJson = {
"status": 1,
"data": [
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x300/B5E61D/fff", "width": 240, "height": 300, "name": "图片1" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x210/333/fff", "width": 240, "height": 210, "name": "图片2" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x190/f60/fff", "width": 240, "height": 190, "name": "图片3" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x230/B5E61D/fff", "width": 240, "height": 230, "name": "图片4" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x280/B5E61D/fff", "width": 240, "height": 280, "name": "图片5" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x260/eee/fff", "width": 240, "height": 260, "name": "图片6" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x180/000/fff", "width": 240, "height": 180, "name": "图片7" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x240/B5E61D/fff", "width": 240, "height": 240, "name": "图片8" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x265/B5E61D/fff", "width": 240, "height": 265, "name": "图片9" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x245/259/fff", "width": 240, "height": 245, "name": "图片10" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x310/B5E61D/fff", "width": 240, "height": 310, "name": "图片11" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x210/B5E61D/fff", "width": 240, "height": 210, "name": "图片12" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x150/B5E61D/fff", "width": 240, "height": 150, "name": "图片13" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x165/B5E61D/fff", "width": 240, "height": 165, "name": "图片14" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x100/B5E61D/fff", "width": 240, "height": 100, "name": "图片15" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x280/B5E61D/fff", "width": 240, "height": 280, "name": "图片16" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x225/B5E61D/fff", "width": 240, "height": 225, "name": "图片17" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x210/B5E61D/fff", "width": 240, "height": 210, "name": "图片18" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x230/B5E61D/fff", "width": 240, "height": 230, "name": "图片19" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x210/B5E61D/fff", "width": 240, "height": 210, "name": "图片20" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x300/B5E61D/fff", "width": 240, "height": 300, "name": "图片21" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x210/333/fff", "width": 240, "height": 210, "name": "图片22" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x190/f60/fff", "width": 240, "height": 190, "name": "图片23" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x230/B5E61D/fff", "width": 240, "height": 230, "name": "图片24" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x280/B5E61D/fff", "width": 240, "height": 280, "name": "图片25" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x210/eee/fff", "width": 240, "height": 210, "name": "图片26" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x180/000/fff", "width": 240, "height": 180, "name": "图片27" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x240/B5E61D/fff", "width": 240, "height": 240, "name": "图片28" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x195/B5E61D/fff", "width": 240, "height": 195, "name": "图片29" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x210/B5E61D/fff", "width": 240, "height": 210, "name": "图片30" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x300/B5E61D/fff", "width": 240, "height": 300, "name": "图片31" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x210/333/fff", "width": 240, "height": 210, "name": "图片32" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x190/f60/fff", "width": 240, "height": 190, "name": "图片33" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x230/B5E61D/fff", "width": 240, "height": 230, "name": "图片34" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x280/B5E61D/fff", "width": 240, "height": 280, "name": "图片35" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x210/eee/fff", "width": 240, "height": 210, "name": "图片36" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x180/000/fff", "width": 240, "height": 180, "name": "图片37" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x240/B5E61D/fff", "width": 240, "height": 240, "name": "图片38" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x195/B5E61D/fff", "width": 240, "height": 195, "name": "图片39" },
{ "href": "http:xxxxxxx", "src": "http://dummyimage.com/240x245/259/fff", "width": 240, "height": 245, "name": "图片40" }
]
}
var wallPic = function () {
var $target = $('#wallList'),
$li = $target.find('li'),
$tips = $('#loadTips'),
oTop = 0, //滚动判断的值
row = 5, //列数
page = 1, //ajax请求的页码值
url = 'xxxx', //ajax请求地址
on_off = true; //插入结构的开关，防止ajax错误性多次加载数据
return {
fillData: function (callback) {
var _that = this;
on_off = false;
/* ajax
--------------------*/
// $.get(url,{ page:page,count:30 },function(json){
// if(json.status==1){
// _that.appendHTML(json.data);
// on_off = true;
// page++;
// }else{
// _that.loadedTips();
// }
// },'json');
/* 模拟测试-设置定时器模拟ajax请求数据
-----------------------*/
setTimeout(function () {
// 模拟终止
if (page == 5) {
_that.loadedTips();
return;
}
_that.appendHTML(testJson.data);
on_off = true;
page++;
}, 400);
},
appendHTML: function (data) {
var len = data.length,
n = 0;
for (; n < len; n++) {
/*每次都将数据加载到高度最小的LI中---最终实现所有li高度都大致相当*/
var minHeight = Math.min.apply(null, [$li.eq(0).height(), $li.eq(1).height(), $li.eq(2).height(), $li.eq(3).height(), $li.eq(4).height()]);
for (var j = 0; j < 5; j++) {
if (minHeight == $li.eq(j).height()) {
$li[j].innerHTML += '<a href="' + data[n].href + '" target="_blank"><img src="' + data[n].src + '" width="' + data[n].width + '" height="' + data[n].height + '" alt="' + data[n].name + '" /><span class="name">' + page * n + data[n].name + '</span></a>';
break;
}
}
/*依次均与的将数据分布到每一列中---将会出现有的li高度会很大
var k = 0;
n > (row - 1) ? k = n % row : k = n;
$li[k].innerHTML += '<a href="' + data[n].href + '" target="_blank"><img src="' + data[n].src + '" width="' + data[n].width + '" height="' + data[n].height + '" alt="' + data[n].name + '" /><span class="name">' + data[n].name + '</span></a>';
*/
}
this.getOTop();
},
getOTop: function () {
oTop = Math.min.apply(null, [$li.eq(0).height(), $li.eq(1).height(), $li.eq(2).height()]) + $target.offset().top;
},
loadedTips: function () { //数据加载完毕
$('#loadTips').find('span').text('数据已加载完');
setTimeout(function () {
$('#loadTips').css({ 'visibility': 'hidden' });
}, 200);
// 解绑事件
$(window).unbind('scroll', $.proxy(this.scrollEvent, this));
},
scrollEvent: function () {//鼠标滚轮事件
if ($(document).scrollTop() + $(window).height() > oTop && on_off) {
this.fillData();
}
},
init: function () {//开始执行事件
this.fillData();
$(window).bind('scroll', $.proxy(this.scrollEvent, this));
}
}
} ();
wallPic.init();
</script>