jQuery插件之ajax分页

pagination.css
jquery.pagination.js

完整程序代码（使用northwind数据库）

var orderby="";
        var pagesize="20"
        function InitData(pageindx)
        {
            var tbody = "";
           
            $.ajax({
               type: "POST",//用POST方式传输
               dataType:"json",//数据格式:JSON
               url:'handler2.ashx',//目标地址
               data:"pi="+(pageindx)+"&orderby="+orderby+"&ps="+pagesize,
               beforeSend:function(){},//发送数据之前
               complete:function(){},//接收数据完毕
               success:function(json) {
                        $("#productTable tr:gt(0)").remove();
                        var productData = json.Products;
                        $.each(productData, function(i, n) {
                            var trs = "";
                            trs += "<tr><td>" + n.ProductID + "</td><td>" + n.ProductName + "</td><td>" + n.UnitPrice + "</td><td>" + n.CategoryID + "</td></tr>";
                            tbody += trs;
                        });

                        $("#productTable").append(tbody);

                        $("#productTable tr:gt(0):odd").attr("class", "odd");
                        $("#productTable tr:gt(0):even").attr("class", "enen");
                        
                        
                        $("#productTable tr:gt(0)").hover(function(){
                            $(this).addClass('mouseover');
                        },function(){
                            $(this).removeClass('mouseover');
                        });


                        $("#Pagination").pagination(json.RecordCount,//记录数 
			   {
                            callback: pageselectCallback,//点击换页的执行函数
                            prev_text: '上一页',
                            next_text: '下一页',
                            items_per_page: pagesize,
                            num_display_entries: 6,
                            current_page: pageindx,
                            num_edge_entries: 2,

                            text1:"每页_条",
                            text2:"共_条记录"

                        });
                }});
               
            }
            function pageselectCallback(page_id, jq) {
                InitData(page_id);
            }

public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        context.Response.Write(getProducts(context));
    }
    private string getProducts(HttpContext context) {
        string pagesize = context.Request["ps"];
        string pageindex = context.Request["pi"];
        string sql = "select top "+pagesize+" * from products where productid not in (select top "+(int.Parse(pagesize)*int.Parse(pageindex)).ToString()+" productid from products)";
        string re = JsonHelper.DataTableToJSON(SqlHelper.ExecuteDataSet(sql).Tables[0], "Products");
        re = re.Substring(0, re.Length - 1) + ",RecordCount:" + SqlHelper.ExecuteScalar("select count(*) from products").ToString() + "}";
        return re;
    }

==============================================================================================

新的js

/**
* This jQuery plugin displays pagination links inside the selected elements.
*
* @author Gabriel Birke (birke *at* d-scribe *dot* de)
* @version 1.1
* @param {int} maxentries Number of entries to paginate
* @param {Object} opts Several options (see README for documentation)
* @return {Object} jQuery Object
*/
jQuery.fn.pagination = function(maxentries, opts) {
    opts = jQuery.extend({
        items_per_page: 10,
        num_display_entries: 10,
        current_page: 0,
        num_edge_entries: 0,
        link_to: "#",
        prev_text: "Prev",
        next_text: "Next",
        ellipse_text: "...",
        prev_show_always: true,
        next_show_always: true,
        callback: function() { return false; }
    }, opts || {});


    return this.each(function() {
        /**
        * Calculate the maximum number of pages
        */
        function numPages() {
            return Math.ceil(maxentries / opts.items_per_page);
        }

        /**
        * Calculate start and end point of pagination links depending on
        * current_page and num_display_entries.
        * @return {Array}
        */
        function getInterval() {
            var ne_half = Math.ceil(opts.num_display_entries / 2);
            var np = numPages();
            var upper_limit = np - opts.num_display_entries;
            var start = current_page > ne_half ? Math.max(Math.min(current_page - ne_half, upper_limit), 0) : 0;
            var end = current_page > ne_half ? Math.min(current_page + ne_half, np) : Math.min(opts.num_display_entries, np);
            return [start, end];
        }

        /**
        * This is the event handling function for the pagination links.
        * @param {int} page_id The new page number
        */
        function pageSelected(page_id, evt) {
            current_page = page_id;
            drawLinks();
            var continuePropagation = opts.callback(page_id, panel);
            if (!continuePropagation) {
                if (evt.stopPropagation) {
                    evt.stopPropagation();
                }
                else {
                    evt.cancelBubble = true;
                }
            }
            return continuePropagation;
        }

        /**
        * This function inserts the pagination links into the container element
        */
        function drawLinks() {
            panel.empty();
            if (opts.text1 && opts.text2)
                panel.append("<a style=' margin-top:-6px;vertical-align:middle; border:0px;'>" + opts.text1.split('_')[0] + opts.items_per_page + opts.text1.split('_')[1] + "&nbsp;&nbsp;"
                            + opts.text2.split('_')[0] + maxentries + opts.text2.split('_')[1] + "</a>");
            var interval = getInterval();
            var np = numPages();
            // This helper function returns a handler function that calls pageSelected with the right page_id
            var getClickHandler = function(page_id) {
                return function(evt) { return pageSelected(page_id, evt); }
            }
            // Helper function for generating a single link (or a span tag if it'S the current page)
            var appendItem = function(page_id, appendopts) {
                page_id = page_id < 0 ? 0 : (page_id < np ? page_id : np - 1); // Normalize page id to sane value
                appendopts = jQuery.extend({ text: page_id + 1, classes: "current" }, appendopts || {});
                if (page_id == current_page) {
                    var lnk = $("<span class='current'>" + (appendopts.text) + "</span>");
                }
                else {
                    var lnk = $("<a>" + (appendopts.text) + "</a>")
                        .bind("click", getClickHandler(page_id))
                        .attr('href', opts.link_to.replace(/__id__/, page_id));


                }
                if (appendopts.classes) { lnk.removeAttr('class'); lnk.addClass(appendopts.classes); }
                panel.append(lnk);
            }
            // Generate "Previous"-Link
            if (opts.prev_text && (current_page > 0 || opts.prev_show_always)) {
                appendItem(current_page - 1, { text: opts.prev_text, classes: "disabled" });
            }
            // Generate starting points
            if (interval[0] > 0 && opts.num_edge_entries > 0) {
                var end = Math.min(opts.num_edge_entries, interval[0]);
                for (var i = 0; i < end; i++) {
                    appendItem(i);
                }
                if (opts.num_edge_entries < interval[0] && opts.ellipse_text) {
                    jQuery("<span>" + opts.ellipse_text + "</span>").appendTo(panel);
                }
            }
            // Generate interval links
            for (var i = interval[0]; i < interval[1]; i++) {
                appendItem(i);
            }
            // Generate ending points
            if (interval[1] < np && opts.num_edge_entries > 0) {
                if (np - opts.num_edge_entries > interval[1] && opts.ellipse_text) {
                    jQuery("<span>" + opts.ellipse_text + "</span>").appendTo(panel);
                }
                var begin = Math.max(np - opts.num_edge_entries, interval[1]);
                for (var i = begin; i < np; i++) {
                    appendItem(i);
                }

            }
            // Generate "Next"-Link
            if (opts.next_text && (current_page < np - 1 || opts.next_show_always)) {
                appendItem(current_page + 1, { text: opts.next_text, classes: "disabled" });
            }


            panel.append("<input id='txtPaginationIndex' value='" + (opts.current_page + 1) + "' style='30px; margin-top:-3px;vertical-align:middle' /></span>");
            panel.append("<a id='btnGo' href='#'>go</a>");

            var btnGo = $("#btnGo", panel);
            btnGo.bind("click", function(e) {
                var indexp = $("#txtPaginationIndex", panel).val();
                if (!isNaN(indexp)) {
                    var number = (parseInt(indexp) - 1);
                    if (number >= 0 && number < numPages())
                        pageSelected(number, e);
                }
            });
        }

        // Extract current_page from options
        var current_page = opts.current_page;
        // Create a sane value for maxentries and items_per_page
        maxentries = (!maxentries || maxentries < 0) ? 1 : maxentries;
        opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0) ? 1 : opts.items_per_page;
        // Store DOM element for easy access from all inner functions
        var panel = jQuery(this);
        // Attach control functions to the DOM element
        this.selectPage = function(page_id) { pageSelected(page_id); }
        this.prevPage = function() {
            if (current_page > 0) {
                pageSelected(current_page - 1);
                return true;
            }
            else {
                return false;
            }
        }
        this.nextPage = function() {
            if (current_page < numPages() - 1) {
                pageSelected(current_page + 1);
                return true;
            }
            else {
                return false;
            }
        }
        // When all initialisation is done, draw the links
        drawLinks();
    });
}