bootstrap与pagehelper实现分页效果

最近做的一些小项目中，都有用到分页，需要自己去搞。就把整个分页实现整理下吧，方便自己也方便他人。

前台

1.引入paging.js

//分页，页码导航,要求参数为一个对象function createPageNav(opt) {  opt= opt || {};  var $container  = opt.$container     || null, //必需，页码容器，请确保这个容器只用来存放页码导航    pageCount  = Number(opt.pageCount)  || 0,  //必需，页码总数    currentNum  = Number(opt.currentNum) || 1,  //选填，当前页码    maxCommonLen = Number(opt.maxCommonLen)|| 10,  //选填，普通页码的最大个数    className = opt.className || "pagination",//选填，分页类型：pagination或pager等    preText  = opt.preText  || "上一页",   //选填，上一页文字显示，适用于只有前后页按钮的情况    nextText = opt.nextText  || "下一页",   //选填，下一页文字，同上    firstText = opt.firstText || "首页",  lastText = opt.lastText  || "末页",    hasFirstBtn = opt.hasFirstBtn  === false ? false : true,    hasLastBtn  = opt.hasLastBtn  === false ? false : true,    hasPreBtn  = opt.hasPreBtn   === false ? false : true,    hasNextBtn  = opt.hasNextBtn  === false ? false : true,    hasInput   = opt.hasInput   === false ? false : true,    hasCommonPage= opt.hasCommonPage === false ? false : true,//选填，是否存在普通页    beforeFun = opt.beforeFun || null, //选填，页码跳转前调用的函数，可通过返回false来阻止跳转，可接收目标页码参数    afterFun = opt.afterFun || null, //选填，页码跳转后调用的函数，可接收目标页码参数    noPageFun = opt.noPageFun || null; //选填，页码总数为0时调用的函数  //当前显示的最小页码，用于计算起始页码，直接容器,当前页，前，后，首，末，输入框  var minNum=1,changeLen,$parent,$currentPage,$preBtn,$nextBtn,$firstBtn,$lastBtn,$input;  //容器  if (!$container || $container.length != 1){    console.log("分页容器不存在或不正确");    return false;  }  //总页数  if(pageCount <= 0){    if(noPageFun) noPageFun();    return false;  }  //当前页  if (currentNum < 1) currentNum = 1;  else if (currentNum > pageCount) currentNum = pageCount;  //普通页码的最大个数，起始页算法限制，不能小于3  if(maxCommonLen<3) maxCommonLen=3;  //跳转页响应长度，用于计算起始页码  if(maxCommonLen>=8) changeLen=3;  else if(maxCommonLen>=5) changeLen=2;  else changeLen=1;  $container.hide();  _initPageNav();  $container.show();  function _initPageNav(){    var initStr = [];    initStr.push('<nav><ul class="'+ className +'" onselectstart="return false">');    if(hasFirstBtn)initStr.push('<li class="first-page" value="1"><span>'+ firstText +'</span></li>');    if(hasPreBtn) initStr.push('<li class="pre-page" value="' + (currentNum - 1) + '"><span>'+ preText +'</span></li>');    if(hasNextBtn) initStr.push('<li class="next-page" value="' + (currentNum + 1) + '"><span>'+ nextText +'</span></li>');    if(hasLastBtn) initStr.push('<li class="last-page" value="' + pageCount + '"><span>'+ lastText +'</span></li>');    if(hasInput)        initStr.push('<div class="input-page-div">当前第<input type="text" maxlength="6" value="' + currentNum + '" />页，共<span>'        + pageCount        + '</span>页<button type="button" class="btn btn-xs input-btn-xs">确定</button></div>');    initStr.push('</ul></nav>');    $container.html(initStr.join(""));    //初始化变量    $parent=$container.children().children();    if(hasFirstBtn) $firstBtn = $parent.children("li.first-page");    if(hasPreBtn)  $preBtn  = $parent.children("li.pre-page");    if(hasNextBtn) $nextBtn = $parent.children("li.next-page");    if(hasLastBtn) $lastBtn = $parent.children("li.last-page");    if(hasInput){      $input = $parent.find("div.input-page-div>input");      $parent.find("div.input-page-div>button").click(function(){        _gotoPage($input.val());      });    }      //初始化功能按钮    _buttonToggle(currentNum);    //生成普通页码    if(hasCommonPage) {      _createCommonPage(_computeStartNum(currentNum), currentNum);    }    //绑定点击事件    $parent.on("click", "li",function () {      var $this=$(this);      if ($this.is("li") && $this.attr("value")){        if(!$this.hasClass("disabled") && !$this.hasClass("active")){          _gotoPage($this.attr("value"));        }      }    });  }  //跳转到页码  function _gotoPage(targetNum) {    targetNum=_formatNum(targetNum);    if (targetNum == 0 || targetNum == currentNum) return false;    // 跳转前回调函数    if (beforeFun && beforeFun(targetNum) === false) return false;    //修改值    currentNum=targetNum;    if(hasInput)  $input.val(targetNum);    if(hasPreBtn) $preBtn.attr("value", targetNum - 1);    if(hasNextBtn) $nextBtn.attr("value", targetNum + 1);    //修改功能按钮的状态    _buttonToggle(targetNum);    // 计算起始页码    if(hasCommonPage) {      var starNum = _computeStartNum(targetNum);      if (starNum == minNum) {// 要显示的页码是相同的        $currentPage.removeClass("active");        $currentPage = $parent.children("li.commonPage").eq(targetNum - minNum).addClass("active");      }       else {// 需要刷新页码        _createCommonPage(starNum, targetNum);      }    }    // 跳转后回调函数    if (afterFun) afterFun(targetNum);  }  //整理目标页码的值  function _formatNum(num){    num = Number(num);    if(isNaN(num)) num=0;    else if (num <= 0) num = 1;    else if (num > pageCount) num = pageCount;    return num;  }  //功能按钮的开启与关闭  function _buttonToggle(current){    if (current == 1) {      if(hasFirstBtn) $firstBtn.addClass("disabled");      if(hasPreBtn)  $preBtn.addClass("disabled");    }     else {      if(hasFirstBtn) $firstBtn.removeClass("disabled");      if(hasPreBtn)  $preBtn.removeClass("disabled");    }    if (current == pageCount) {      if(hasNextBtn) $nextBtn.addClass("disabled");      if(hasLastBtn) $lastBtn.addClass("disabled");    }    else {      if(hasNextBtn) $nextBtn.removeClass("disabled");      if(hasLastBtn) $lastBtn.removeClass("disabled");    }  }  //计算当前显示的起始页码  function _computeStartNum(targetNum) {    var startNum;    if (pageCount <= maxCommonLen)      startNum = 1;    else {      if ((targetNum - minNum) >= (maxCommonLen-changeLen)) {//跳转到靠后的页码        startNum = targetNum - changeLen;        if ((startNum + maxCommonLen-1) > pageCount) startNum = pageCount - (maxCommonLen-1);// 边界修正      }       else if ((targetNum - minNum) <= (changeLen-1)) {//跳转到靠前的页码        startNum = targetNum - (maxCommonLen-changeLen-1);        if (startNum <= 0) startNum = 1;// 边界修正      }       else {// 不用改变页码        startNum = minNum;      }    }    return startNum;  }  //生成普通页码  function _createCommonPage(startNum, activeNum) {    var initStr = [];    for (var i = 1,pageNum=startNum; i <= pageCount && i <= maxCommonLen; i++ , pageNum++) {      initStr.push('<li class="commonPage" value="' + pageNum + '"><a href="javascript:" rel="external nofollow" >' + pageNum + '</a></li>');    }    $parent.hide();    $parent.children("li.commonPage").remove();    if(hasPreBtn) $preBtn.after(initStr.join(""));    else if(hasFirstBtn) $firstBtn.after(initStr.join(""));    else $parent.prepend(initStr.join(""));    minNum = startNum;    $currentPage = $parent.children("li.commonPage").eq(activeNum-startNum).addClass("active");    $parent.show();  }}