jQuery+Asp.net 实现简单的下拉加载更多功能

原来做过的商城项目现在需要增加下拉加载的功能，简单的实现了一下。大概可以整理一下思路跟代码。

把需要下拉加载的内容进行转为JSON处理存在当前页面：

<script type="text/javascript">var objson = eval([{"Id":"5991","product_name":"正品璐瑶颈肩按摩器  披肩颈椎按摩","order_by":"98569","is_show":"True","price":"428","sale_price":"399","Images":"saxjua16.jpg"},{"Id":"5990","product_name":"多功能绞肉机  家用料理机 电动搅拌机","order_by":"98568","is_show":"True","price":"429","sale_price":"399","Images":"d2yjivhl.jpg"},....更多省略]</script>

下面就是javascript代码的事情了

<script type="text/javascript">
        $(document).ready(function () {
            var totalheight = 0;
            function loadData() {
                totalheight = parseFloat($(window).height()) + parseFloat($(window).scrollTop());
                if ($(document).height() <= totalheight) {
                    GetProducts();//加载数据
                }
            }
            $(document).scroll(function () {
                loadData();
            });

            function GetProducts() {
                var htmlSource;
                var iIndex = 6; //每次加载元素数量
                var icount = parseInt($("#hidJsonCount").val()); //已加载数量 作为for下标值
                var obj = objson;
                if (obj.length - icount < 6) {
                    iIndex = obj.length - icount;
                }
                if (icount < obj.length) {
                    for (var i = icount; i < (icount+iIndex); i++) {
                        var val = obj[i];
                        htmlSource += '<div class="deal">';
                        htmlSource += '<a href="p_show.aspx?productId=' + val.Id + '" target="_blank">';
                        htmlSource += '<img src="http://www.baidu.com/upload-file/images/product/' + val.Images + '" alt="" border="0" title="' + val.product_name + '"></a>';
                        htmlSource += '<h3>';
                        htmlSource += '<a href="p_show.aspx?productId=' + val.Id + '" title="' + val.product_name + '" target="_blank">' + val.product_name + '</a>';
                        htmlSource += '</h3>';
                        htmlSource += '<h4>';
                        htmlSource += '<em><b>¥</b>' + val.sale_price + '</em><a href="p_show.aspx?productId=' + val.Id + '" target="_blank">查看</a>';
                        htmlSource += '</h4>';
                        htmlSource += '<span class="newicon"></span>';
                        htmlSource += '</div>';
                    }
                    $("#hidJsonCount").val((icount + iIndex).toString());
                }
                $("#moreProduct").append(htmlSource);
            }
        });
    </script>

$("#hidJsonCount").val();此处为一个input hidden的隐藏标签 用来存储已经加载了多少数据。

至此功能完结。