一个重构的js分页类

时间：2024-04-04 21:36:58
// JavaScript Document

/**//**

* js分页类

* @param iAbsolute 每页显示记录数

* @param sTableId 分页表格属性ID值，为String

* @param sTBodyId 分页表格TBODY的属性ID值,为String,此项为要分页的主体内容

* @Version 1.0.0

* @author 辛现宝 2007-01-15 created

* var __variable__; private

* function __method__(){};private

*/

function Page(iAbsolute,sTableId,sTBodyId)

{

this.absolute = iAbsolute; //每页最大记录数

this.tableId = sTableId;

this.tBodyId = sTBodyId;

this.rowCount = 0;//记录数

this.pageCount = 0;//页数

this.pageIndex = 0;//页索引

this.__oTable__ = null;//表格引用

this.__oTBody__ = null;//要分页内容

this.__dataRows__ = 0;//记录行引用

this.__oldTBody__ = null;

this.__init__(); //初始化;

};

/**//*

初始化

*/

Page.prototype.__init__ = function(){

this.__oTable__ = document.getElementById(this.tableId);//获取table引用

this.__oTBody__ = this.__oTable__.tBodies[this.tBodyId];//获取tBody引用

this.__dataRows__ = this.__oTBody__.rows;

this.rowCount = this.__dataRows__.length;

try{

this.absolute = (this.absolute <= 0) || (this.absolute>this.rowCount) ? this.rowCount : this.absolute;

this.pageCount = parseInt(this.rowCount%this.absolute == 0

? this.rowCount/this.absolute : this.rowCount/this.absolute+1);

}catch(exception){}

this.__updateTableRows__();

};

/**//*

下一页

*/

Page.prototype.nextPage = function(){

if(this.pageIndex + 1 < this.pageCount){

this.pageIndex += 1;

this.__updateTableRows__();

}

};

/**//*

上一页

*/

Page.prototype.prePage = function(){

if(this.pageIndex >= 1){

this.pageIndex -= 1;

this.__updateTableRows__();

}

};

/**//*

首页

*/

Page.prototype.firstPage = function(){

if(this.pageIndex != 0){

this.pageIndex = 0;

this.__updateTableRows__();

}

};

/**//*

尾页

*/

Page.prototype.lastPage = function(){

if(this.pageIndex+1 != this.pageCount){

this.pageIndex = this.pageCount - 1;

this.__updateTableRows__();

}

};

/**//*

页定位方法

*/

Page.prototype.aimPage = function(iPageIndex){

if(iPageIndex > this.pageCount-1){

this.pageIndex = this.pageCount - 1;

}else if(iPageIndex < 0){

this.pageIndex = 0;

}else{

this.pageIndex = iPageIndex;

}

this.__updateTableRows__();

};

/**//*

执行分页时，更新显示表格内容

*/

Page.prototype.__updateTableRows__ = function(){

var iCurrentRowCount = this.absolute * this.pageIndex;

var iMoreRow = this.absolute+iCurrentRowCount > this.rowCount ? this.absolute+iCurrentRowCount - this.rowCount : 0;

var tempRows = this.__cloneRows__();

//alert(tempRows === this.dataRows);

//alert(this.dataRows.length);

var removedTBody = this.__oTable__.removeChild(this.__oTBody__);

var newTBody = document.createElement("TBODY");

newTBody.setAttribute("id", this.tBodyId);

for(var i=iCurrentRowCount; i < this.absolute+iCurrentRowCount-iMoreRow; i++){

newTBody.appendChild(tempRows[i]);

}

this.__oTable__.appendChild(newTBody);

/**//*

this.dataRows为this.oTBody的一个引用，

移除this.oTBody那么this.dataRows引用将销失,

code:this.dataRows = tempRows;恢复原始操作行集合.

*/

this.__dataRows__ = tempRows;

this.__oTBody__ = newTBody;

//alert(this.dataRows.length);

//alert(this.absolute+iCurrentRowCount);

//alert("tempRows:"+tempRows.length);

};

/**//*

克隆原始操作行集合

*/

Page.prototype.__cloneRows__ = function(){

var tempRows = [];

for(var i=0; i<this.__dataRows__.length; i++){

/**//*

code:this.dataRows[i].cloneNode(param),

param = 1 or true:复制以指定节点发展出去的所有节点,

param = 0 or false:只有指定的节点和它的属性被复制.

*/

tempRows[i] = this.__dataRows__[i].cloneNode(1);

}

return tempRows;

};

例子

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>无标题文档</title>

<script type="text/javascript" language="javascript">

window.onload = function(){

page = new Page(3,'table1','group_one'); };

</script>

</head>

<body>

<table id="table1" border="0" width="486">

<thead>

<tr style="background-color:#CCCCCC;">

<th style="cursor:pointer;">Last Name</th>

<th style="cursor:pointer;">First Name</th>

<th style="cursor:pointer;">Birthday</th>

<th style="cursor:pointer;">Siblings</th>

</tr>

</thead>

<tbody id="group_one">

<tr style="background-color:#f3f3f3">

<td>Smith</td>

<td>John</td>

<td>7/12/1978</td>

<td>2</td>

</tr>

<tr style="background-color:#B4D6FC">

<td>Johnson</td>

<td>Betty</td>

<td>10/15/1977</td>

<td>4</td>

</tr>

<tr style="background-color:#f3f3f3">

<td>Henderson</td>

<td>Nathan</td>

<td>2/25/1949</td>

<td>1</td>

</tr>

<tr style="background-color:#B4D6FC">

<td>Williams</td>

<td>James</td>

<td>7/8/1980</td>

<td>4</td>

</tr>

<tr style="background-color:#f3f3f3">

<td>Gilliam</td>

<td>Micheal</td>

<td>7/22/1949</td>

<td>1</td>

</tr>

<tr style="background-color:#f3f3f3">

<td>Smith</td>

<td>John</td>

<td>7/12/1978</td>

<td>2</td>

</tr>

<tr style="background-color:#B4D6FC">

<td>Johnson</td>

<td>Betty</td>

<td>10/15/1977</td>

<td>4</td>

</tr>

<tr style="background-color:#f3f3f3">

<td>Henderson</td>

<td>Nathan</td>

<td>2/25/1949</td>

<td>1</td>

</tr>

<tr style="background-color:#B4D6FC">

<td>Williams</td>

<td>James</td>

<td>7/8/1980</td>

<td>4</td>

</tr>

<tr style="background-color:#f3f3f3">

<td>Gilliam</td>

<td>Micheal</td>

<td>7/22/1949</td>

<td>1</td>

</tr>

</tbody>

</table>

<span id="s"></span>

<table>
<tr>
<td><a href="#" onclick="page.nextPage();">下一页</a></td>
<td><a href="#" onclick="page.prePage();">上一页</a></td>
<td><span id="pageindex"></span></td>
</tr>
</table>

</body>

</html>

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