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Javascript實(shí)現(xiàn)的分頁(yè)函數(shù)

更新時(shí)間：2007年02月07日 00:00:00 作者：

/**
* 分頁(yè)類構(gòu)造
* 參數(shù) nTotalList: 總條數(shù)
* 參數(shù) nPageSize: 每頁(yè)顯示條數(shù)
* 參數(shù) nPageNum: 當(dāng)前頁(yè)碼
* 參數(shù) sPageUrl: 分頁(yè)鏈接的URL，頁(yè)碼以[pn]代替，輸出時(shí)將被替換為實(shí)際頁(yè)碼
* 參數(shù) nPageListSize: 頁(yè)碼列表（下拉框）中顯示的最多頁(yè)碼條數(shù)。該參數(shù)可省略，默認(rèn)100
*/
function Pagination(nTotalList, nPageSize, nPageNum, sPageUrl, nPageListSize) {
  this.totalList = nTotalList;
  this.pageSize = nPageSize;
  this.pageNum = nPageNum;
  if (nTotalList == 0)
    this.totalPages = 1;
  else
    this.totalPages = Math.floor((this.totalList-1)/this.pageSize + 1);
  this.pageUrl = sPageUrl;
  if (arguments[4])
    this.pageListSize = nPageListSize;
  else
    this.pageListSize = 100;
}

/**
* 生成分頁(yè)，將HTML直接輸出
* 無(wú)參數(shù)
* 無(wú)返回值
*/
Pagination.prototype.generate = function() {
  var output = "";
  output += "<table width=\"98%\" cellspacing=\"1\" cellpadding=\"3\" align=\"center\"><tr><td align=\"right\">";
  output += "共 " + this.totalList + " 條每頁(yè) " + this.pageSize + " 條當(dāng)前第 ";
  output += "<select onchange=\"if(this.value)location.href='" + this.pageUrl + "'.replace(/\\[pn\\]/,";
  output += "this.value);\" align=\"absMiddle\" style=\"font:normal 9px Verdana,Arial,宋體;\">";
  var firstPage = this.pageNum - Math.floor(this.pageListSize/2);
  if (firstPage < 1)
    firstPage = 1;
  var lastPage = firstPage + this.pageListSize - 1;
  if (lastPage > this.totalPages) {
    lastPage = this.totalPages;
    firstPage = lastPage - this.pageListSize + 1;
    if (firstPage < 1)
      firstPage = 1;
  }
  if (firstPage > 1) {
    output += "<option value=\"1\">1</option>";
    if (firstPage > 2)
      output += "<option value=\"\">…</option>";
  }
  for (var p = firstPage; p <= lastPage; p++) {
    output += "<option value=\"" + p + "\"";
    if (p == this.pageNum)
      output += " selected=\"yes\"";
    output += ">" + p + "</option>";
  }
  if (lastPage < this.totalPages) {
    if (lastPage < this.totalPages - 1)
      output += "<option value=\"\">…</option>";
    output += "<option value=\"" + this.totalPages + "\">" + this.totalPages + "</option>";
  }
  if (this.pageNum > this.totalPages)
    output += "<option value=\"\" selected=\"yes\">頁(yè)碼超出范圍</option>";
  output += "</select>";
  output += "/" + this.totalPages + " 頁(yè) ";
  if (this.pageNum == 1) {
    output += "[首頁(yè)] ";
    output += "[上頁(yè)] ";
  }
  else {
    output += "<a href=\"" + this.pageUrl.replace(/\[pn\]/, "1") + "\">[首頁(yè)]</a> ";
    output += "<a href=\"" + this.pageUrl.replace(/\[pn\]/, this.pageNum-1) + "\">[上頁(yè)]</a> ";
  }
  if (this.pageNum == this.totalPages) {
    output += "[下頁(yè)] ";
    output += "[尾頁(yè)]";
  }
  else {
    output += "<a href=\"" + this.pageUrl.replace(/\[pn\]/, this.pageNum+1) + "\">[下頁(yè)]</a> ";
    output += "<a href=\"" + this.pageUrl.replace(/\[pn\]/, this.totalPages) + "\">[尾頁(yè)]</a> ";
  }
  output += "</td></tr></table>";
  document.writeln(output);
}