in javascript ,how to according one input filed value to set an another?

[cdtuql]

in javascript ,how to according one input filed value to set an another?
my question is like this:
 <td>性质</td>
                   <td align="left">
                        <select id="dishes_disheseditform_thetypecombox" class="easyui-combobox" name="thetype" style="width:100px;" data-options="
                        onSelect: function(rec){
                        if (rec.value=='00') {
                          $('#dishes_disheseditform_itemNo').val('me');
                         }else if(rec.value=='01') {
                          alert(rec.text);
                         }
                        }
                        ">
                                <option value="no"></option>
                                <option value="00">商品</option>
                                <option value="01">菜品</option>d
                      </select>
                   </td>
                  
                <td>菜品编号</td>
                <td><input id="dishes_disheseditform_itemNo" name="itemNo" class="easyui-textbox"    /></td>
               </tr>

but I can not set the value of input id="dishes_disheseditform_itemNo",
how can i do?

[jarry]

The '#dishes_disheseditform_itemNo' is a textbox component, please call 'setValue' method to change its value.

Code:

$('#dishes_disheseditform_itemNo').textbox('setValue', 'me');