要素：struts1
一、
1、test.jsp
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
?<script type="text/javascript" src="<%=request.getContextPath()%>/jquery/DLC.js"></script>
?</head>
?
?
<html:form>
?? <td width="150" align="left">
????? <html:select property="makeName" styleId="makeName"? onchange="getYear('yearName','${pageContext.request.contextPath}/website/index.do?method=getYear&makeName='+this[this.selectedIndex].value)">
????????????<html:option value="Select..."/>
????????????<html:options property="makeName" labelProperty="makeName" collection="makeList"/>
???????????</html:select>
?? </td>
?
?
<td width="150" align="left">
????????????<html:select property="yearName" onchange="getModel()" styleId="yearName">
?????????????<html:option value="Select..."/>
?????????????<html:options labelProperty="yearName" property="yearName" collection="yearList"/>????????????
????????????</html:select>
???????????</td>
</html:form>
?
?
2、DLC.js
function getYear(makeName,url){
?$.ajax({
??type:'post',
??url:url,
??success: function(html){$('#'+makeName).html(html);}
??});
}
?
3、Action
?
public ActionForward getYears(ActionMapping mapping,ActionForm form,HttpServletRequest request,
???HttpServletResponse response){
?
??String makeName = request.getParameter("makeName");
????
??List<String> years = idlcs.getYears(makeName,lanId);
??request.setAttribute("years", years);
??return mapping.findForward("getYears");
?}
?
4、getYears.jsp(以页面的方式返回结果)
?
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
?<%
?List<String> list = (List)request.getAttribute("years");
?for(String tm :list){
?%>
?<option value="<%=tm%>"><%=tm%></option>
?<%
?}
?%>
?
?改写3、4步，直接返回结果，不写jsp页面了
?
?public ActionForward getYears(ActionMapping mapping,ActionForm form,HttpServletRequest request,
???HttpServletResponse response){
?
??String makeName = request.getParameter("makeName");
??List<String> years = idlcs.getYears(makeName,lanId);
? ??
??response.setContentType("text/html");
??response.setHeader("Cache-Control", "no-cache");
??response.setCharacterEncoding("UTF-8");
??
??PrintWriter out = null;
??try {
???out = response.getWriter();
??
??for(String year:years){
???out.println("<option>"+year+"</option>");
??}
??out.close();
??} catch (IOException e) {
???e.printStackTrace();
??}finally{
???if(out!=null){
????out.close();
???}
??}
??return null;
?
?
?
二、<html:select>标签属性onchange里不支持<%=request.getContextPath()%>,支持EL表达式
struts-html.tld:
<tag>
<name>select</name>
<attribute>
...
<name>onchange</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
...
</tag>
?
?
<#
Element : rtexprvalue
Defines if the nesting attribute can have scriptlet expressions as a value, i.e the value
?of the attribute may be dynamically calculated at request time, as opposed to a static
?value determined at translation time. #PCDATA ::= true | false | yes | no If not present
?then the default is "false", i.e the attribute has a static value
Data Type : #PCDATA
#>
?
?
**************************************************************************
实例：
1、在javascript中
var url1 = "<%=request.getContextPath()%>/admin/manageChangeRecord.do?method=checkSameVenderBySerialno";
???var oldCode = changeRecordInfoForm.oldCode.value;
???var newCode = changeRecordInfoForm.newCode.value;
$.ajax({
????url:url1,
??? ?cache: false,
????????? dataType:"text",
????????? data:{code1:oldCode,code2:newCode},
????????? success: function(ret){//ret为服务器返回值
???????????????????? if(ret=="false"){
???????????????????? ?alert("换机的产品属于不同的分公司，不能换机");
???????????????????? }else{
???????????????????? document.forms[0].submit();
??????document.getElementById("subid").disabled="disabled";
???????????????????? }
?????????????? ??}
???});
?
服务器端：
public ActionForward checkSameVenderBySerialno(ActionMapping actionMapping,
???ActionForm actionForm, HttpServletRequest request,
???HttpServletResponse response) throws X431WebException {
?long oldVenderId = ...
?long newVenderId = ...
? ......
?
??//flag 为true时，表示换机的是同一个分公司的产品
??boolean flag = oldVenderId==newVenderId?true:false;
??try {
???PrintWriter pw = response.getWriter();
???pw.print(flag);
???pw.flush();
??} catch (IOException e) {
???e.printStackTrace();
??}
??return null;
?}