Javascript实现的分页函数

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From: IECN.Net ; Author: 钟钟

/**
* 分页类构造
* 参数 nTotalList: 总条数
* 参数 nPageSize: 每页显示条数
* 参数 nPageNum: 当前页码
* 参数 sPageUrl: 分页链接的URL，页码以[pn]代替，输出时将被替换为实际页码
* 参数 nPageListSize: 页码列表（下拉框）中显示的最多页码条数。该参数可省略，默认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;
}

/**
* 生成分页，将HTML直接输出
* 无参数
* 无返回值
*/
Pagination.prototype.generate = function() {
var output = "";
output += "<table width=\"98%\" cellspacing=\"1\" cellpadding=\"3\" align=\"center\"><tr><td align=\"right\">";
output += "共 " + this.totalList + " 条 每页 " + this.pageSize + " 条 当前第 ";
output += "<select onchange=\"if(this.value)location.href='" + this.pageUrl + "'.replace(/\\[pn\\]/,";
output += "this.value);\" align=\"absMiddle\" style=\"font:normal 9px Verdana,Arial,宋体;\">";
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\">页码超出范围</option>";
output += "</select>";
output += "/" + this.totalPages + " 页 ";
if (this.pageNum == 1) {
output += "[首页] ";
output += "[上页] ";
}
else {
output += "<a href=\"" + this.pageUrl.replace(/\[pn\]/, "1") + "\">[首页]</a> ";
output += "<a href=\"" + this.pageUrl.replace(/\[pn\]/, this.pageNum-1) + "\">[上页]</a> ";
}
if (this.pageNum == this.totalPages) {
output += "[下页] ";
output += "[尾页]";
}
else {
output += "<a href=\"" + this.pageUrl.replace(/\[pn\]/, this.pageNum+1) + "\">[下页]</a> ";
output += "<a href=\"" + this.pageUrl.replace(/\[pn\]/, this.totalPages) + "\">[尾页]</a> ";
}
output += "</td></tr></table>";
document.writeln(output);
}

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