// JavaScript Document

function showPages(name) { //初始化属性
  this.name = name;      //对象名称
  this.page = 1;         //当前页数
  this.pageCount = 1;    //总页数
  this.argName = 'page'; //参数名
  this.showTimes = 1;    //打印次数
}

showPages.prototype.getPage = function(){ //丛url获得当前页数,如果变量重复只获取最后一个
  var args = location.search;
  var reg = new RegExp('[\?&]?' + this.argName + '=([^&]*)[&$]?', 'gi');
  var chk = args.match(reg);
  this.page = RegExp.$1;
}
showPages.prototype.checkPages = function(){ //进行当前页数和总页数的验证
  if (isNaN(parseInt(this.page))) this.page = 1;
  if (isNaN(parseInt(this.pageCount))) this.pageCount = 1;
  if (this.page < 1) this.page = 1;
  if (this.pageCount < 1) this.pageCount = 1;
  if (this.page > this.pageCount) this.page = this.pageCount;
  this.page = parseInt(this.page);
  this.pageCount = parseInt(this.pageCount);
}
showPages.prototype.createHtml = function(mode){ //生成html代码
  var strHtml = '', prevPage = this.page - 1, nextPage = this.page + 1;
  if (mode == '' || typeof(mode) == 'undefined') mode = 0;
  switch (mode) {
    case 0 : //模式1 (页数,首页,前页,后页,尾页)
      strHtml += '<span class="count">Pages: ' + this.page + ' / ' + this.pageCount + '</span>';
      strHtml += '<span class="number">';
      if (prevPage < 1) {
        strHtml += '<span title="First Page">«</span>';
        strHtml += '<span title="Prev Page">‹</span>';
      } else {
        strHtml += '<span title="First Page"><a href="javascript:' + this.name + '.toPage(1);">«</a></span>';
        strHtml += '<span title="Prev Page"><a href="javascript:' + this.name + '.toPage(' + prevPage + ');">‹</a></span>';
      }
      for (var i = 1; i <= this.pageCount; i++) {
        if (i > 0) {
          if (i == this.page) {
            strHtml += '<span title="Page ' + i + '">[' + i + ']</span>';
          } else {
            strHtml += '<span title="Page ' + i + '"><a href="javascript:' + this.name + '.toPage(' + i + ');">[' + i + ']</a></span>';
          }
        }
      }
      if (nextPage > this.pageCount) {
        strHtml += '<span title="Next Page">›</span>';
        strHtml += '<span title="Last Page">»</span>';
      } else {
        strHtml += '<span title="Next Page"><a href="javascript:' + this.name + '.toPage(' + nextPage + ');">›</a></span>';
        strHtml += '<span title="Last Page"><a href="javascript:' + this.name + '.toPage(' + this.pageCount + ');">»</a></span>';
      }
      strHtml += '</span>';
      break;
    case 1 : //模式1 (10页缩略,首页,前页,后页,尾页)
      strHtml += '<span class="count">Pages: ' + this.page + ' / ' + this.pageCount + '</span>';
      strHtml += '<span class="number">';
      if (prevPage < 1) {
        strHtml += '<span title="First Page">«</span>';
        strHtml += '<span title="Prev Page">‹</span>';
      } else {
        strHtml += '<span title="First Page"><a href="javascript:' + this.name + '.toPage(1);">«</a></span>';
        strHtml += '<span title="Prev Page"><a href="javascript:' + this.name + '.toPage(' + prevPage + ');">‹</a></span>';
      }
      if (this.page % 10 ==0) {
        var startPage = this.page - 9;
      } else {
        var startPage = this.page - this.page % 10 + 1;
      }
      if (startPage > 10) strHtml += '<span title="Prev 10 Pages"><a href="javascript:' + this.name + '.toPage(' + (startPage - 1) + ');">...</a></span>';
      for (var i = startPage; i < startPage + 10; i++) {
        if (i > this.pageCount) break;
        if (i == this.page) {
          strHtml += '<span title="Page ' + i + '">[' + i + ']</span>';
        } else {
          strHtml += '<span title="Page ' + i + '"><a href="javascript:' + this.name + '.toPage(' + i + ');">[' + i + ']</a></span>';
        }
      }
      if (this.pageCount >= startPage + 10) strHtml += '<span title="Next 10 Pages"><a href="javascript:' + this.name + '.toPage(' + (startPage + 10) + ');">...</a></span>';
      if (nextPage > this.pageCount) {
        strHtml += '<span title="Next Page">›</span>';
        strHtml += '<span title="Last Page">»</span>';
      } else {
        strHtml += '<span title="Next Page"><a href="javascript:' + this.name + '.toPage(' + nextPage + ');">›</a></span>';
        strHtml += '<span title="Last Page"><a href="javascript:' + this.name + '.toPage(' + this.pageCount + ');">»</a></span>';
      }
      strHtml += '</span>';
      break;
    case 2 : //模式2 (前后缩略,页数,首页,前页,后页,尾页)
      strHtml += '<span class="count">' + this.page + ' / ' + this.pageCount + '</span>';
      strHtml += '<span class="number">';
      if (prevPage < 1) {
        strHtml += '<span title="始页">始页</span>┊';
        strHtml += '<span title="上一页">上一页</span>';
      } else {
        strHtml += '<span title="始页"><a href="javascript:' + this.name + '.toPage(1);">始页</a></span>┊';
        strHtml += '<span title="上一页"><a href="javascript:' + this.name + '.toPage(' + prevPage + ');">上一页</a></span>';
      }
      if (this.page != 1) strHtml += '<span title="第1页"><a href="javascript:' + this.name + '.toPage(1);">[1]</a></span>';
      if (this.page >= 5) strHtml += '<span>...</span>';
      if (this.pageCount > this.page + 2) {
        var endPage = this.page + 2;
      } else {
        var endPage = this.pageCount;
      }
      for (var i = this.page - 2; i <= endPage; i++) {
        if (i > 0) {
          if (i == this.page) {
            strHtml += '<span title="第' + i + '页">[' + i + ']</span>';
          } else {
            if (i != 1 && i != this.pageCount) {
              strHtml += '<span title="第' + i + '页"><a href="javascript:' + this.name + '.toPage(' + i + ');">[' + i + ']</a></span>';
            }
          }
        }
      }
      if (this.page + 3 < this.pageCount) strHtml += '<span>...</span>';
      if (this.page != this.pageCount) strHtml += '<span title="第' + this.pageCount + '页"><a href="javascript:' + this.name + '.toPage(' + this.pageCount + ');">[' + this.pageCount + ']</a></span>';
      if (nextPage > this.pageCount) {
        strHtml += '<span title="下一页">下一页</span>┊';
        strHtml += '<span title="末页">末页</span>';
      } else {
        strHtml += '<span title="下一页"><a href="javascript:' + this.name + '.toPage(' + nextPage + ');">下一页</a></span>┊';
        strHtml += '<span title="末页"><a href="javascript:' + this.name + '.toPage(' + this.pageCount + ');">末页</a></span>';
      }
      strHtml += '</span>';
      break;
    case 3 : //模式3 (箭头样式,首页,前页,后页,尾页) (only IE)
      strHtml += '<span class="count">Pages: ' + this.page + ' / ' + this.pageCount + '</span>';
      strHtml += '<span class="arrow">';
      if (prevPage < 1) {
        strHtml += '<span title="First Page">9</span>';
        strHtml += '<span title="Prev Page">7</span>';
      } else {
        strHtml += '<span title="First Page"><a href="javascript:' + this.name + '.toPage(1);">9</a></span>';
        strHtml += '<span title="Prev Page"><a href="javascript:' + this.name + '.toPage(' + prevPage + ');">7</a></span>';
      }
      if (nextPage > this.pageCount) {
        strHtml += '<span title="Next Page">8</span>';
        strHtml += '<span title="Last Page">:</span>';
      } else {
        strHtml += '<span title="Next Page"><a href="javascript:' + this.name + '.toPage(' + nextPage + ');">8</a></span>';
        strHtml += '<span title="Last Page"><a href="javascript:' + this.name + '.toPage(' + this.pageCount + ');">:</a></span>';
      }
      strHtml += '</span>';
      break;
    case 4 : //模式4 (下拉框)
      if (this.pageCount < 1) {
        strHtml += '<select name="toPage" disabled>';
        strHtml += '<option value="0">No Pages</option>';
      } else {
        var chkSelect;
        strHtml += '<select name="toPage" onchange="' + this.name + '.toPage(this);">';
        for (var i = 1; i <= this.pageCount; i++) {
          if (this.page == i) chkSelect=' selected="selected"';
          else chkSelect='';
          strHtml += '<option value="' + i + '"' + chkSelect + '> ' + i + ' / ' + this.pageCount + '</option>';
        }
      }
      strHtml += '</select>';
      break;
    case 5 : //模式5 (输入框)
      strHtml += '<span class="input">';
      if (this.pageCount < 1) {
        strHtml += '<input type="text" name="toPage" value="No Pages" class="itext" disabled="disabled">';
        strHtml += '<input type="button" name="go" value="GO" class="ibutton" disabled="disabled"></option>';
      } else {
        strHtml += '<input type="text" value="Input Page:" class="ititle" readonly="readonly">';
        strHtml += '<input type="text" id="pageInput' + this.showTimes + '" value="' + this.page + '" class="itext" title="Input page" onkeypress="return ' + this.name + '.formatInputPage(event);" onfocus="this.select()">';
        strHtml += '<input type="text" value=" / ' + this.pageCount + '" class="icount" readonly="readonly">';
        strHtml += '<input type="button" name="go" value="GO" class="ibutton" onclick="' + this.name + '.toPage(document.getElementById(\'pageInput' + this.showTimes + '\').value);"></option>';
      }
      strHtml += '</span>';
      break;
    default :
      strHtml = 'Javascript showPage Error: not find mode ' + mode;
      break;
  }
  return strHtml;
}
showPages.prototype.createUrl = function (page) { //生成页面跳转url
  if (isNaN(parseInt(page))) page = 1;
  if (page < 1) page = 1;
  if (page > this.pageCount) page = this.pageCount;
  var url = location.protocol + '//' + location.host + location.pathname;
  var args = location.search;
  var reg = new RegExp('([\?&]?)' + this.argName + '=[^&]*[&$]?', 'gi');
  args = args.replace(reg,'$1');
  if (args == '' || args == null) {
    args += '?' + this.argName + '=' + page;
  } else if (args.substr(args.length - 1,1) == '?' || args.substr(args.length - 1,1) == '&') {
      args += this.argName + '=' + page;
  } else {
      args += '&' + this.argName + '=' + page;
  }
  return url + args;
}
showPages.prototype.toPage = function(page){ //页面跳转
  var turnTo = 1;
  if (typeof(page) == 'object') {
    turnTo = page.options[page.selectedIndex].value;
  } else {
    turnTo = page;
  }
  self.location.href = this.createUrl(turnTo);
}
showPages.prototype.printHtml = function(mode){ //显示html代码
  this.getPage();
  this.checkPages();
  this.showTimes += 1;
  document.write('<div id="pages_' + this.name + '_' + this.showTimes + '" class="pages"></div>');
  document.getElementById('pages_' + this.name + '_' + this.showTimes).innerHTML = this.createHtml(mode);
  
}
showPages.prototype.formatInputPage = function(e){ //限定输入页数格式
  var ie = navigator.appName=="Microsoft Internet Explorer"?true:false;
  if(!ie) var key = e.which;
  else var key = event.keyCode;
  if (key == 8 || key == 46 || (key >= 48 && key <= 57)) return true;
  return false;
}