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

时间：2021-11-22 22:16:29

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>

　　

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