<td class="TableBorder1">
<input id="ywm" type="hidden" name="ywm" runat="server" />
<select id="province" onchange="window.document.Form1.ywm.value=this.options[this.selectedIndex].value;" name="province">
<option>--请选择--</option>
<option>BOM用量</option>
<option>部品查询</option>
<option>单品数量(含呆滞帐套数量)</option>
<option>当月开工工单</option>
<option>订单月报表</option>
<option>服务部出入库</option>
<option>服务库库存</option>
<option>工单开工天数</option>
<option>工辅料月度用量</option>
<option>供应商月度采购金额</option>
<option>驾驶舱测试</option>
<option>考勤汇总</option>
<option>年度订单统计</option>
<option>未结束单据</option>
<option>业务管理</option>
<option>主机事业本部截止当日应付款</option>
</select>
</td>
select改变以后id="ywm" 为什么获取不到值呢
<input id="ywm" type="hidden" name="ywm" runat="server" />
<select id="province" onchange="window.document.Form1.ywm.value=this.options[this.selectedIndex].value;" name="province">
<option>--请选择--</option>
<option>BOM用量</option>
<option>部品查询</option>
<option>单品数量(含呆滞帐套数量)</option>
<option>当月开工工单</option>
<option>订单月报表</option>
<option>服务部出入库</option>
<option>服务库库存</option>
<option>工单开工天数</option>
<option>工辅料月度用量</option>
<option>供应商月度采购金额</option>
<option>驾驶舱测试</option>
<option>考勤汇总</option>
<option>年度订单统计</option>
<option>未结束单据</option>
<option>业务管理</option>
<option>主机事业本部截止当日应付款</option>
</select>
</td>
select改变以后id="ywm" 为什么获取不到值呢
<input id="ywm" type="hidden" name="ywm" runat="server" />
<%--<select id="province" onchange="window.document.Form1.ywm.value=this.options[this.selectedIndex].value;" name="province">--%>
<select id="province" onchange="document.getElementById("ywm").value=this.options[this.selectedIndex].value;" name="province">
<option>--请选择--</option>
<option value = "BOM用量">BOM用量</option>
<option value= "部品查询">部品查询</option>
<option value= "单品数量(含呆滞帐套数量)">单品数量(含呆滞帐套数量)</option>
<option value ="当月开工工单">当月开工工单</option>
<option value ="订单月报表">订单月报表</option>
<option value ="服务部出入库">服务部出入库</option>
<option value ="服务库库存">服务库库存</option>
<option value ="工单开工天数">工单开工天数</option>
<option value ="工辅料月度用量">工辅料月度用量</option>
<option value ="供应商月度采购金额">供应商月度采购金额</option>
<option value ="驾驶舱测试">驾驶舱测试</option>
<option value ="考勤汇总">考勤汇总</option>
<option value ="年度订单统计">年度订单统计</option>
<option value ="未结束单据">未结束单据</option>
<option value ="业务管理">业务管理</option>
<option value ="主机事业本部截止当日应付款">主机事业本部截止当日应付款</option>
</select>
</td> 还是不行啊
<input id="ywm" type="text" name="ywm" runat="server" />
<select id="province" onchange="document.getElementById('ywm').value=this.options[this.selectedIndex].value;" name="province">
<option>--请选择--</option>
<option value = "BOM用量">BOM用量</option>
<option value= "部品查询">部品查询</option>
<option value= "单品数量(含呆滞帐套数量)">单品数量(含呆滞帐套数量)</option>
<option value ="当月开工工单">当月开工工单</option>
<option value ="订单月报表">订单月报表</option>
<option value ="服务部出入库">服务部出入库</option>
<option value ="服务库库存">服务库库存</option>
<option value ="工单开工天数">工单开工天数</option>
<option value ="工辅料月度用量">工辅料月度用量</option>
<option value ="供应商月度采购金额">供应商月度采购金额</option>
<option value ="驾驶舱测试">驾驶舱测试</option>
<option value ="考勤汇总">考勤汇总</option>
<option value ="年度订单统计">年度订单统计</option>
<option value ="未结束单据">未结束单据</option>
<option value ="业务管理">业务管理</option>
<option value ="主机事业本部截止当日应付款">主机事业本部截止当日应付款</option>
</select>
经测试可以
<select id="province" onchange="javascript:document.getElementById('ywm').value=this.options[this.selectedIndex].value;">