请教select下拉框问题

abcxiaoye 2015-01-25 11:44:37

下载了的二级联动源码，想把它移植到strtut标签网页中来，相关代码如下：

<html:form  action="baseData/med.do"  method="post"  focus="title" enctype="multipart/form-data" onsubmit="return 

save();">     

   <input type="hidden" name="command" value="add" />

        <html:hidden property="id"/>

       

            <tr>

          <td align="right">类别：</td>

          <td align="left">

          <select id="directoryId" name="directoryId" onchange="change()">

            <option value="0" selected="selected">

                请选择主目录

            </option>

              

            <logic:iterate id="blist" name="dcs" scope="request">

                <option value="${blist.id}">

                    ${blist.name}

                </option>

            </logic:iterate>

              

        </select>

          <select name="categoryId" id="categoryId">

                  <option value=""><font color="#FF0000">--选择子目录--</font></option>

            </select>

             

          <td colspan="2" align="center"><html:submit><bean:message key="button.submit" /></html:submit></td>

        </tr>

      </table>

    </html:form>

<script type="text/javascript">

    var req;

          

        function init() {

            if(window.XMLHttpRequest) {

                req = new XMLHttpRequest();

            } else if (window.ActiveXObject) {

                req = new ActiveXObject("Microsoft.XMLHTTP");

            }

        }

        function change() {

            init();

            var url = "getChilds.jsp?id="+ escape(document.getElementById('directoryId').value);

            req.open("GET", url, true);

            req.onreadystatechange = callback;

            req.send(null);

        }

        </script>

getChilds.jsp页面

<%

String id = request.getParameter("id");

 

    CategoryDao dao = new CategoryDao();

    List cs = dao.findByHQL("from Category where directoryId="+ Integer.parseInt(id));

     

    System.out.println(cs.size());

StringBuffer buf = new StringBuffer();

buf.append("document.medForm.categoryId.length = " + (cs.size()+1) + ";\n");//这里document.medForm.categoryId不知怎么修改，请高手出招

buf.append("document.medForm.categoryId.options[0].value = '';\n");

buf.append("document.medForm.categoryId.options[0].text = '--请选择--';\n");

buf.append("document.medForm.categoryId.selectedIndex = 0;\n");

 

int i=0;

for(Iterator iter = cs.iterator(); iter.hasNext(); i++) {

    Category t = (Category)iter.next();

     

    buf.append("document.medForm.categoryId.options[" + (i+1) + "].value = '" + t.getId() + "';\n");

    buf.append("document.medForm.categoryId.options[" + (i+1) + "].text = '" + t.getName() + "';\n");

}