根据用户查询选择动态显示表的数据列

有的时候,当用户选择查询条件时碰到查询结果列表字段太多时，常常会想要选择性地只显示部分由自己选择的字段.现在为了达到根据用户选择动态显示查询结果的列的效果，可以在查询条件上构建一个checkboxlist,当用户勾选某几个字段时,查询结果的列只显示用户选中的这几个字段.另外,为了达到友好的用户体验,如果用户一个字段都没选中,会有提示的效果.
(注:本实例只给出部分关键的代码)

step1.部分关联的jsp页面代码

<tr>
			<td  class="td_title" nowrap="nowrap">统计显示列<font color="red">*</font></td>
			<td class="detail">
				<input type="checkbox" name="reportSearchVO.rowFields" value="<%=RowFieldVO.ROW_FIELD_DATE %>" />日期 
				<input type="checkbox" name="reportSearchVO.rowFields" value="<%=RowFieldVO.ROW_FIELD_SP %>" />运营商
				<input type="checkbox" name="reportSearchVO.rowFields" value="<%=RowFieldVO.ROW_FIELD_CP %>" checked="checked"/>合作商
				<input type="checkbox" name="reportSearchVO.rowFields" value="<%=RowFieldVO.ROW_FIELD_SERVICE %>"/>业务
				<input type="checkbox" name="reportSearchVO.rowFields" value="<%=RowFieldVO.ROW_FIELD_PROVINCE %>"/>省份
				<input type="checkbox" name="reportSearchVO.rowFields" value="<%=RowFieldVO.ROW_FIELD_FLAG %>"/>明细
			</td>
		</tr>
			<tr align="center">
			<td colspan="2" nowrap="nowrap" align="center">
				<span style="PADDING-RIGHT: 10px;">
					<input class=button type=submit value="查询" onclick="return Verfidy();"/>
		   			<input class=button type=button onclick="removeall()" value="清空" /></span></td>
		</tr>

注:比如选择运营商、业务、省份,则reportSearchVO.rowFields={2,4,5}

step2.相关的js代码

function Verfidy() {		
		var tmp = document.getElementsByName("reportSearchVO.rowFields");
		var field=null;
		for (var i=0;i<tmp.length; i++) {
			if (tmp[i].checked){
				field=tmp[i].value;
				break;
			}
		}
		alert("field:" + field);
		if (field==null){
			alert("请至少选择一项统计列！");
			return false;
		}
		document.getElementById("reportForm").action=action;
		return true;
	}

step3.reportSearchVO对应的(相关列显示)属性如下:
 

private String[] rowFields;
  private RowFieldVO rowFieldVO = new RowFieldVO();

其中,RowFieldVO:

  public static final int ROW_FIELD_DATE = 1;
	public static final int ROW_FIELD_SP=2;
	public static final int ROW_FIELD_CP=3;
	public static final int ROW_FIELD_SERVICE=4;
	public static final int ROW_FIELD_PROVINCE = 5;
	public static final int ROW_FIELD_FLAG =6;




	/**
	 * 0: 不显示；1: 显示
	 */
	private int isShowDate = 0;
	private int isShowProvince = 0;
	private int isShowSP=0;
	private int isShowCP = 0;
	private int isShowService =0;
	private int isShowFlag =0;
	
	/**
	 * 判断并获得要统计显示的列
	 * @param rowFields
	 * @return
	 */
	public void setShowRowField(String[] rowFields){
		for (String rowField : rowFields) {
			int rowValue = Integer.valueOf(rowField);
			if (rowValue == RowFieldVO.ROW_FIELD_DATE) {
				isShowDate = 1;
			}else if (rowValue == RowFieldVO.ROW_FIELD_PROVINCE) {
				isShowProvince = 1;
			}else if(rowValue == RowFieldVO.ROW_FIELD_SP){
				isShowSP = 1;
			}else if (rowValue ==RowFieldVO.ROW_FIELD_CP){
				isShowCP = 1;
			}else if (rowValue ==RowFieldVO.ROW_FIELD_SERVICE) {
				isShowService = 1;
			}else if (rowValue ==RowFieldVO.ROW_FIELD_FLAG) {
				isShowFlag = 1;
			}
		}
	}

step4.查询的action和service
action:

reportResultVOList = reportService.getReportList(reportSearchVO);

service：

reportSearchVO.getRowFieldVO().setShowRowField(reportSearchVO.getRowFields());//引用step3中rowFieldVO的setShowRowField方法判断哪些字段是需要显示的

step5.查询的sql语句(ibatis)

SELECT '0',
				<isEqual property="rowFieldVO.isShowDate" compareValue="1">
				b.dates,
				</isEqual>
				<isEqual property="rowFieldVO.isShowDate" compareValue="0">
				      null dates,
			    </isEqual>
			    <isEqual property="rowFieldVO.isShowSP" compareValue="1">
				b.spId,
				</isEqual>
				<isEqual property="rowFieldVO.isShowSP" compareValue="0">
				      null spId,
			    </isEqual>
			    <isEqual property="rowFieldVO.isShowCP" compareValue="1">
				b.cpId,
				cp.username cpName,
				</isEqual>
				
			    <isEqual property="rowFieldVO.isShowCP" compareValue="0">
			          null cpId ,
				      null cpName,
			    </isEqual>
			    
				<isEqual property="rowFieldVO.isShowService" compareValue="1">
				b.serviceCode,
				service.name serviceName,
				</isEqual>
				
				<isEqual property="rowFieldVO.isShowService" compareValue="0">
				null serviceCode,
				null serviceName,
				</isEqual>
				<isEqual property="rowFieldVO.isShowProvince" compareValue="1">
				b.provinceId,
				province.provinceName,
				</isEqual>
				<isEqual property="rowFieldVO.isShowProvince" compareValue="0">
				null provinceId,
				null provinceName,
			    </isEqual>
FROM XXX WHERE 
				 b.dates BETWEEN #beginDate# AND #endDate#		             
				
				 <isGreaterThan property="spId" compareValue="0">
						AND b.spId=#spId#
				</isGreaterThan>
				<isGreaterThan property="cpId" compareValue="0">
						AND b.cpId=#cpId#
				</isGreaterThan>	
				<isGreaterThan property="serviceCode" compareValue="0">
						AND b.serviceCode=#serviceCode#
				</isGreaterThan>
				<isNotEmpty property="provinceId" >
						AND b.provinceId=#provinceId#
				</isNotEmpty>

step6.动态显示查询结果的页面

表头:
<s:if test="reportSearchVO.rowFieldVO.isShowDate==1"><td class="td_title" nowrap="nowrap">日期</td></s:if>
				<s:if test="reportSearchVO.rowFieldVO.isShowSP==1"><td class="td_title" nowrap="nowrap">运营商</td></s:if>
				<s:if test="reportSearchVO.rowFieldVO.isShowCP==1"><td class="td_title" nowrap="nowrap">合作商</td></s:if>
	      		<s:if test="reportSearchVO.rowFieldVO.isShowService==1"><td class="td_title" nowrap="nowrap">业务</td></s:if>
				<s:if test="reportSearchVO.rowFieldVO.isShowProvince==1"><td class="td_title" nowrap="nowrap">省份</td></s:if>
(注:表中省略):

这样,就达到了由用户选择动态显示所选字段的效果.step3是本业务的核心代码.另外注意<s:if test/>标签的使用.