Question

我在JSP设计的网页上有multiSelect下拉列表。最终用户将选择所需选项并将表单保存到数据库。下面是从Database Master Table获取值和索引的原始Dropdown。选定的值保存在另一个表中。

页面上的原始下拉列表。

 <table>
 <tr>
 <td> Departments Impacted   </td>
    <td><select multiple="multiple" name="abc" id="abc">
     <%

         Statement stt3 = conn.createStatement();
         ResultSet rstt3 = stt3.executeQuery("SELECT DEPT_DEPARTMENT_ID, DEPT_NAME FROM [PA].[dbo].[PA_DEPT_DEPARTMENT] ORDER BY DEPT_NAME ASC");
         while (rstt3.next()) {

         %>

         <option value="<%=rstt3.getString(1)%>"><%=rstt3.getString(2)%>
         </option>
         <%
             }
            stt3.close();
     rstt3.close();
                            %>
    </select></td>  </tr>

下面的代码检索已保存的数据库值，并在新的选择标记中将其显示为已选中。但是，我希望所选值显示在上表中而不是新的Dropdown中。

<%
 ArrayList al = new ArrayList();    
 String dept = null;
 String deptID = "SELECT DEPARTMENT_ID FROM  [PA_RD_DEP_REQ_DETAILS_DEPARTMENT_MAP] inner join  [PA_RD_REQUISITION_DETAILS] on RD_DEP_RD_ID=RD_ID where RD_ID=?";

         PreparedStatement pst4 = conn.prepareStatement(deptID);
         pst4.setString(1, RD_ID);
         ResultSet rstt1 = pst4.executeQuery();
         while (rstt1.next()) {
             dept=rstt1.getString(1);
            al.add(dept);

         }
         for(int i=0; i<al.size(); i++)
         {
         String deptName = "SELECT [DEPT_NAME] FROM  [PA_DEPT_DEPARTMENT] WHERE [DEPT_DEPARTMENT_ID]=?";
         PreparedStatement pst5 = conn.prepareStatement(deptName);
         pst5.setString(1, (String)al.get(i));
         ResultSet rstt5 = pst5.executeQuery();
         while (rstt5.next()) {
             %>
             <option value="<%=(String)al.get(i)%>" selected="selected"><%=rstt5.getString(1)%>
             <%  


         }
         }


         %>

Answer 1

将selected attribute添加到option标记会使其被选中。这可以针对多个选项标签完成，无需JavaScript：

<select multiple="multiple">
  <option selected="selected" value="volvo">Volvo</option>
  <option selected="selected" value="saab">Saab</option>
  <option value="vw">VW</option>
  <option value="audi">Audi</option>
</select>

已选择多选下拉列表

1 个答案: