html 分页封装

html 分页封装

var Paging = (function () {
  function Paging(elementName, options) {
    this.elementName = elementName;
    this.options = options;
    options.nowPage = options.nowPage >= 1 ? options.nowPage : 1;
    options.pageNum = options.pageNum > 0 ? options.pageNum : 0;
    options.canJump = options.canJump || 0;
    options.showOne = options.showOne || 0;
    options.buttonNum = (options.buttonNum >= 5 ? options.buttonNum : 5) || 7;
    this.nowPage = options.nowPage > options.pageNum ? options.pageNum : options.nowPage;
    this.pageNum = options.pageNum < 0 ? 0 : options.pageNum;
    this.canJump = options.canJump;
    this.showOne = options.showOne;
    this.buttonNum = options.buttonNum;
    this.callback = options.callback;
    this.element = document.getElementById(elementName);
    this.init();
  }
  Paging.prototype.init = function () {
    this.createHtml();
  };
  Paging.prototype.createHtml = function () {
    var _this = this;
    var content = [];
    //如果pageNum小于等于0则不渲染
    if (this.pageNum <= 0) {
      return '';
    }
    //如果只有一页并且设置为不显示，则不进行渲染
    if (!this.showOne && this.pageNum === 1) {
      this.element.innerHTML = '';
      return '';
    }
    content.push("
");
    content.push("
");
    //页面总数小于等于当前要展示页数总数，展示所有页面
    if (this.pageNum <= this.buttonNum) {
      for (var i = 1; i <= this.pageNum; i++) {
        if (this.nowPage !== i) {
          content.push("
" + i + "
");
        }
        else {
          content.push("
" + i + "
");
        }
      }
    }
    else if (this.nowPage <= Math.floor(this.buttonNum / 2)) {
      //当前页面小于等于展示页数总数的一半（向下取整），从1开始
      for (var i = 1; i <= this.buttonNum - 2; i++) {
        if (this.nowPage !== i) {
          content.push("
" + i + "
");
        }
        else {
          content.push("
" + i + "
");
        }
      }
      content.push("
...
");
      content.push("
" + this.pageNum + "
");
    }
    else if (this.pageNum - this.nowPage <= Math.floor(this.buttonNum / 2)) {
      //当前页面大于展示页数总数的一半（向下取整）
      content.push("
" + 1 + "
");
      content.push("
...
");
      for (var i = this.pageNum - this.buttonNum + 3; i <= this.pageNum; i++) {
        if (this.nowPage !== i) {
          content.push("
" + i + "
");
        }
        else {
          content.push("
" + i + "
");
        }
      }
    }
    else {
      //前半部分页码
      if (this.nowPage - Math.floor(this.buttonNum / 2) <= 0) {
        for (var i = 1; i <= Math.floor(this.buttonNum / 2); i++) {
          if (this.nowPage !== i) {
            content.push("
" + i + "
");
          }
          else {
            content.push("
" + i + "
");
          }
        }
      }
      else {
        content.push("
" + 1 + "
");
        content.push("
...
");
        for (var i = this.nowPage - Math.floor(this.buttonNum / 2) + (this.buttonNum % 2 == 0 ? 3 : 2); i <= this.nowPage; i++) {
          if (this.nowPage !== i) {
            content.push("
" + i + "
");
          }
          else {
            content.push("
" + i + "
");
          }
        }
      }
      //后半部分页码
      if (this.pageNum - this.nowPage <= 0) {
        for (var i = this.nowPage + 1; i <= this.pageNum; i++) {
          content.push("
" + i + "
");
        }
      }
      else {
        for (var i = this.nowPage + 1; i <= this.nowPage + Math.floor(this.buttonNum / 2) - 2; i++) {
          content.push("
" + i + "
");
        }
        content.push("
...
");
        content.push("
" + this.pageNum + "
");
      }
    }
    content.push("
");
    if (this.canJump) {
      content.push("
共" + this.pageNum + "页页
");
      content.push("
跳转
");
    }
    content.push("
");
    this.element.innerHTML = content.join('');
    this.element.setAttribute('style', 'margin:20px auto;color:#666;text-align:center;');
    // DOM重新生成后每次调用是否禁用button
    setTimeout(function () {
      _this.disabled();
      _this.bindClickEvent();
    }, 20);
  };
  Paging.prototype.bindClickEvent = function () {
    var _this = this;
    var liList = this.element.children[0].children;
    var _loop_1 = function (i) {
      liList[i].removeEventListener('click', function () {
        _this.clickEvent(liList[i]);
      });
    };
    for (var i = 0; i < liList.length; i++) {
      _loop_1(i);
    }
    var _loop_2 = function (i) {
      liList[i].addEventListener('click', function () {
        _this.clickEvent(liList[i]);
      });
    };
    for (var i = 0; i < liList.length; i++) {
      _loop_2(i);
    }
  };
  Paging.prototype.clickEvent = function (li) {   //点击事件
    var cla = li.className;
    var num = parseInt(li.innerHTML);
    var nowPage = this.nowPage;
    if (li.className.indexOf('xl-disabled') !== -1 || cla === 'xl-jumpText') {
      return '';
    }
    if (cla === 'xl-prevPage') { //点击上一页
      if (nowPage >= 1) {
        this.nowPage -= 1;
      }
    }
    else if (cla === 'xl-nextPage') { //点击下一页
      if (nowPage < this.pageNum) {
        this.nowPage += 1;
      }
    }
    else if (cla === 'xl-jumpButton') { //点击跳转按钮
      var el = document.getElementById('xlJumpNum');//获取页码输入框的值
      //没有输入正整数 或 大于总页数 或小于0
      if (!(/(^[1-9]\d*$)/.test(Number(el.value))) || Number(el.value) > this.pageNum || Number(el.value) <= 0) {
        // alert('请输入合法的页码！');
        el.value = ''; //清空页码输入框
        return false;
      } else {
        this.nowPage = Number(el.value);
      }
    } else {
      this.nowPage = num;
    }
    this.createHtml();
    if (this.callback) {
      this.callback(this.nowPage);    //回调
    }
  };
  Paging.prototype.disabled = function () {
    var nowPage = this.nowPage;
    var pageNum = this.pageNum;
    var liList = this.element.children[0].children;
    if (nowPage === 1) {
      for (var i = 0; i < liList.length; i++) {
        if (liList[i].className.indexOf('xl-prevPage') !== -1) {
          liList[i].setAttribute('class', liList[i].getAttribute('class').concat(' xl-disabled'));
        }
      }
    }
    else if (nowPage === pageNum) {
      for (var i = 0; i < liList.length; i++) {
        if (liList[i].className.indexOf('xl-nextPage') !== -1) {
          liList[i].setAttribute('class', liList[i].getAttribute('class').concat(' xl-disabled'));
        }
      }
    }
  };
  return Paging;
}());