前台排序

<table id="tblSort" width="100%" border="0" cellspacing="1" cellpadding="2"
			align="center" bordercolordark="#DFDFFF" bordercolorlight="#003366"
			bgcolor="#B3C4DB">		
			<thead>
			<tr class="lc2" bgcolor="#809cbc">
				<td width="6%" height="18" align="center"></td>
				<td width="5%" align="center"><a href="#" onClick="chooseAll()">全选</a></td>
				<td width="10%" align="center" onclick="sortTable('tblSort',2)" style="cursor:pointer">编号</td>
				<td width="30%" align="center">标题</td>
				<td width="10%" align="center" onclick="sortTable('tblSort',4)" style="cursor:pointer">信件类别</td>
				<td width="10%" align="center" onclick="sortTable('tblSort',5)" style="cursor:pointer">问题发生地</td>
				<td width="10%" align="center" onclick="sortTable('tblSort',6)" style="cursor:pointer">初审情况</td>
				<td width="11%" align="center" onclick="sortTable('tblSort',7)" style="cursor:pointer">到达时间</td>
			</tr>
			</thead>			
			
			<tbody>
			<c:forEach var="letter" items="${requestScope.pm}">
			<tr class="lc2" bgcolor="#EEF4FF"
				onmouseover="this.bgColor='#EBEBEB';"
				onmouseout="this.bgColor='#EEF4FF';">
				<td width="6%" height="18" align="center"><img src="<%=path %>/images/lvdian.gif" width="16" height="15" title="正常办理"/></td>
				<td width="5%" align="center"><input type="checkbox" name="allchecked3" id="allchecked3" value="${letter.processFlow.id}"></td>
				<td width="10%" align="center">${ letter.identifier}</td>
				<td width="33%" align="center"><a href="<%=path %>/jsp/process/chushen.do?method=checkupInput&petitionLetterId=${letter.id }">${ letter.letterInformation.title}</a></td>
				<td width="10%" align="center">${ letter.letterInformation.letterCategory}</td>
				<td width="9%" align="center">${ letter.letterInformation.province}</td>
				<td width="10%" align="center">${ letter.processFlow.auditState}</td>
				<td width="9%" align="center">${ letter.letterInformation.date}</td>
			</tr>			
			
			</c:forEach>
			</tbody>
			<%
				if(list.size()<8){
					int j = 8-list.size();
					for(int i=0;i<j;i++){
			%>
			<tr class="lc2" bgcolor="#EEF4FF"
				onmouseover="this.bgColor='#EBEBEB';"
				onmouseout="this.bgColor='#EEF4FF';">
				<td width="6%" height="22" align="center"></td>
				<td width="5%" align="center"></td>
				<td width="10%" align="center"></td>
				<td width="33%" align="center"></td>
				<td width="10%" align="center"></td>
				<td width="9%" align="center"></td>
				<td width="10%" align="center"></td>
				<td width="9%" align="center"></td>
			</tr>
		    <%
					}
				}
			%>
			
		</table>

//转换器，将列的字段类型转换为可以排序的类型：String,int,float
            function convert(sValue, sDataType) {
                switch(sDataType) {
                    case "int":
                        return parseInt(sValue);
                    case "float":
                        return parseFloat(sValue);
                    case "date":
                        return new Date(Date.parse(sValue));
                    default:
                        return sValue.toString();
                
                }
            }
            
            //排序函数产生器，iCol表示列索引，sDataType表示该列的数据类型
            function generateCompareTRs(iCol, sDataType) {
        
                return  function compareTRs(oTR1, oTR2) {
                            var vValue1 = convert(oTR1.cells[iCol].firstChild.nodeValue, sDataType);
                            var vValue2 = convert(oTR2.cells[iCol].firstChild.nodeValue, sDataType);
        
                            if (vValue1 < vValue2) {
                                return -1;
                            } else if (vValue1 > vValue2) {
                                return 1;
                            } else {
                                return 0;
                            }
                        };
            }
            
            //排序方法
            function sortTable(sTableID, iCol, sDataType) {
                var oTable = document.getElementById(sTableID);
                var oTBody = oTable.tBodies[0];
                var colDataRows = oTBody.rows;
                var aTRs = new Array;
                
                //将所有列放入数组
                for (var i=0; i < colDataRows.length; i++) {
                    aTRs[i] = colDataRows[i];
                }
                 
                //判断最后一次排序的列是否与现在要进行排序的列相同，是的话，直接使用reverse()逆序
                if (oTable.sortCol == iCol) {
                    aTRs.reverse();
                } else {
                    //使用数组的sort方法，传进排序函数
                    aTRs.sort(generateCompareTRs(iCol, sDataType));
                }
        
                var oFragment = document.createDocumentFragment();
                for (var i=0; i < aTRs.length; i++) {
                    oFragment.appendChild(aTRs[i]);
                }
       
                oTBody.appendChild(oFragment);
                //记录最后一次排序的列索引
                oTable.sortCol = iCol;
            }