缓存的级联下拉列表

需要在table外边，加一层form，否则平台传不过来第一级下拉列表的值。

 1                 <form>
 2                     <table width=100% class="scheduling-packageTableHeader-condition">
 3                         <tr>
 4                             <td width=50 height=40><font color='red' style='font-size:13px'>&nbsp;*&nbsp;</font>&nbsp;船号:&nbsp;</td>
 5                             <td width=120>
 6                                 <input id='pln_order_product_id' name='pln_order_product_id' title_='船号' type_='dynamic' value='' valueText='' width_='110' serviceName='PLN.ORDER.PRODUCT_ID_PULL_DOWN' searchColName='product_id' />
 7                             </td>
 8                             <td width=60>&nbsp;分段号:&nbsp;</td>
 9                             <td width=120 align="left">
10                                 <input id='pln_order_section_id' name='pln_order_section_id' title_='分段号' type_='dynamic' value='' valueText='' width_='110' serviceName='PLN.ORDER.SECTION_ID_PULL_DOWN' searchColName='section_id' />
11                             </td>
12                             <td width=60>&nbsp;工段号:&nbsp;</td>
13                             <td class='tdLeft' width=140>
14                                 <input id='pln_order_prod_unit_uid' name='pln_order_prod_unit_uid' title_='工段号' 
15                                 type_='dynamic' value='' valueText='' isNotNull='isNotNull'  width_='115'  length='20'  hidePageIcon='on'
16                                 sc_page_size='50'  serviceName='BAS.PRODUCTION.UNIT.List' searchColName='unit_name' />
17                             </td>                                        
18                             <td width=130><font color='red' style='font-size:13px'>&nbsp;*&nbsp;</font>&nbsp;ERP计划完工日期：&nbsp;</td>
19                             <td width=110>
20                                 <input onclick="WdatePicker()" value='' style='width:85px' class='inputDate' id='pln_order_erp_pln_end_date' name='pln_order_erp_pln_end_date' />
21                             </td>
22                             <td width=150>
23                                 <button type_='button' class='fxButton' onclick="pln.scheduling.queryPln()">查询</button>
24                                 &nbsp;
25                                 <button type_='button' class='fxButton' onclick="pln.scheduling.reset()">重置</button>
26                                 &nbsp;
27                             </td>
28                             <td style='text-align: right'>
29                                 &nbsp;
30                                 <button type_='button' class='fxButton' onclick="pln.scheduling.save('0')">保存</button>
31                                 &nbsp;
32                                 <button type_='button' class='fxButton' onclick="pln.scheduling.save('1')" style='margin-right:0px;'>保存并提交</button>    
33                             </td>
34                         </tr>
35                     </table>
36                     </form>