bootstrap与pagehelper实现分页效果

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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();
  }
}

2.引入paging.css

ul.pagination>li>span,ul.pagination>li>a,ul.pagination>li.active>a,ul.pager>li>span{
cursor: pointer;
}
.input-page-div>input{
width:5em;
height:1.8em;
margin:0.4em 0.2em 0.2em 0.2em;
text-align: center;
}
.input-page-div>.input-btn-xs{
margin-left:1em;
font-size: 1em;
width:3em;
background-color: #337ab7;
color:#fff;
}
.input-page-div{
display: inline-block;
margin-left:1em;
}

3.页面中添加一个div容器

<div id="paging"></div>

4.js中添加一段代码

createPageNav({
   $container : $("#paging"),
   pageCount : data.pages,
   currentNum : data.pageNum,
   afterFun : function(num){
     getResult(num,10);
   }
 });

例：

function getResult(pageNum,pageSize){
   $.ajax({
     type: "GET",
     url: "../../metrics.do?type=8&pageNum="+pageNum+"&pageSize="+pageSize,
     data: {},
     dataType: "json",
     success: function(data){
       list = data.data;
       createPageNav({
          $container : $("#paging"),
          pageCount : data.pages,
          currentNum : data.pageNum,
          afterFun : function(num){
            getResult(num,10);
          }
       });
       createList(data.data);
//      createSelect(data);
       console.info(data);
     }
   });
}

后台

5.引入pagehelper依赖

<!-- yuruixin add mybatis paging -->
  <dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>4.1.6</version>
  </dependency>

6.service层添加如下代码

//pageSize=0时，查询所有
PageHelper.startPage(pageNum, pageSize);
Page<ExtractMetrics> extractMetrics = extractMetricsMapper.selectByCondition(extractMetric,pageNum,pageSize);

7.controller层添加如下代码

Map<String,Object> map = new HashMap<String,Object>();
//查询页数
map.put("pageNum", extractMetrics.getPageNum());
 //每页条数
map.put("pageSize", extractMetrics.getPageSize());
 //总条数
map.put("total", extractMetrics.getTotal());
 //总页数
map.put("pages", extractMetrics.getPages());
map.put("data", extractMetrics.getResult());

至此，bootstrap与pagehelper实现分页流程完毕

效果如下：