function bt_submit(){
  var $title = $.trim($("#title").val());
  if($title=="") {
    ShowMessage("運營商名稱不能為空","#ff0000");
    return;
   }
   document.all.form1.submit(); 
  } 

HTML程式碼如下：

       <tr>
     <td width="18%" align="right">運營商名稱：</td>
     <td colspan="3"><s:textfield id="title" key="operatorbean.title" size="88" value="%{#request.operatorbean.title}" /> </td> 
    </tr>