JS分页2

调用：

var pageChange = function (index) {

            var html = pager("divid", index, 5, 1000, pageChange, { showGoTo: false, showFirst: false });

        }

实现：

   pager = function (divPager, pageIndex, pageSize, totalCount, pageChange, opt) {



        var theOpt = {

            barSize: 5, //分页条显示的页码数   

            barTemplate: "{bar}  共{totalPage}页{totalCount}条 {goto}", //显示模板

            autoHide: true, //是否自动隐藏

            showFirst: true, //在totalPage>barSize时是自动否显示第一页链接

            showLast: true, //在totalPage>barSize时是自动否显示最后一页链接

            showGoTo: true, //是否显示GoTo

            autoHideGoTo: true //如果太少是否自动隐藏GoTo

        };



        if (opt) {

            if (opt.barSize)

                theOpt.barSize = opt.barSize;

            if (opt.barTemplate)

                theOpt.barTemplate = opt.barTemplate;

            if (opt.autoHide == false)

                theOpt.autoHide = false;

            if (opt.showFirst == false)

                theOpt.showFirst = false;

            if (opt.showLast = false)

                theOpt.showLast = false;

            if (opt.showGoTo == false)

                theOpt.showGoTo = false;

            if (opt.autoHideGoTo == false)

                theOpt.autoHideGoTo = false;

        }

        var handles = window.myPagerChanges = (function (x) { return x; } (window.myPagerChanges || {}));



        if (!myPagerChanges[divPager]) myPagerChanges[divPager] = pageChange;



        var startPage = 0;  //分页条起始页

        var endPage = 0;    //分页条终止页

        var showFirst = true;

        var showLast = true;





        if (isNaN(pageIndex)) {

            pageIndex = 1;

        }

        pageIndex = parseInt(pageIndex);

        if (pageIndex <= 0)

            pageIndex = 1;

        if (pageIndex * pageSize > totalCount) {

            pageIndex = Math.ceil(totalCount / pageSize);

        }



        if (totalCount == 0) { //如果没数据

            document.getElementById(divPager).innerHTML = "";

            return "";

        }



        var totalPage = Math.ceil(totalCount / pageSize);

        if (theOpt.autoHide && totalCount <= pageSize) {   //自动隐藏

            document.getElementById(divPager).innerHTML = "";

            return "";

        }



        if (totalPage <= theOpt.barSize) {

            startPage = 1;

            endPage = this.totalPage;

            theOpt.showLast = theOpt.showFirst = false;

        }

        else {

            if (pageIndex <= Math.ceil(theOpt.barSize / 2)) { //最前几页时

                startPage = 1;

                endPage = theOpt.barSize;

                theOpt.showFirst = false;

            }

            else if (pageIndex > (totalPage - theOpt.barSize / 2)) { //最后几页时

                startPage = totalPage - theOpt.barSize + 1;

                endPage = totalPage;

                theOpt.showLast = false;

            }

            else {                                          //中间的页时

                startPage = pageIndex - Math.ceil(theOpt.barSize / 2) + 1;

                endPage = pageIndex + Math.floor(theOpt.barSize / 2);

            }

            if (totalPage <= (theOpt.barSize * 1.5)) {

                theOpt.showLast = theOpt.showFirst = false;

            }

        }



        function _getLink(index, txt) {

            if (!txt) txt = index;

            return "<a href='javascript:;' style='margin: 2px 5px;border: 1px solid #6d8cad;color: #0269BA;padding: 2px 5px;text-decoration: none;' onclick='myPagerChanges[\"" + divPager + "\"](" + index + ")'>" + txt + "</a>";

        }



        var barHtml = "";  //分页条

        barHtml += pageIndex == 1 ? "" : _getLink(pageIndex - 1, "上一页");

        if (theOpt.showFirst) {

            barHtml += _getLink(1) + "<span>...</span>";

        }

        for (var index = startPage; index <= endPage; index++) {



            if (index == pageIndex) {

                barHtml += "<span style='color:red;font-weight:blod; '>" + index + "</span>";

            }

            else {

                barHtml += _getLink(index);

            }

        }

        if (theOpt.showLast) {

            barHtml += "<span>...</span>" + _getLink(totalPage);

        }

        barHtml += pageIndex == totalPage ? "" : _getLink(pageIndex + 1, "下一页");



        var gotoHtml = "";  //goto框及按钮

        if (theOpt.showGoTo && theOpt.barTemplate.indexOf("{goto}") > 0) {

            if ((theOpt.autoHideGoTo && totalPage > 15) || theOpt.autoHideGoTo == false) {

                var txtid = divPager + "_goIndex";

                var indexVal = "document.getElementById(\"" + txtid + "\").value";

                gotoHtml += "<input type='text' onkeypress='if(event.keyCode==13){myPagerChanges[\"" + divPager + "\"](" + indexVal + ")}' id='" + txtid + "' value=" + pageIndex + " style='width:30px'>";

                gotoHtml += " <input type='button' class='page_bg' value='go' onclick='myPagerChanges[\"" + divPager + "\"](" + indexVal + ")'>";

            }

        }



        //替换模板

        var pagerHtml = theOpt.barTemplate.replace("{bar}", barHtml)

                                  .replace("{totalCount}", totalCount)

                                  .replace("{pageIndex}", pageIndex)

                                  .replace("{totalPage}", totalPage)

                                  .replace("{goto}", gotoHtml);



        document.getElementById(divPager).innerHTML = pagerHtml;

        return pagerHtml;

    };