通过jquery实现ajax调用

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jquery & ajax

HTML JavaScript JSP Ajax jQuery

要素：struts1

一、

1、test.jsp

<head>

<html:form>

      <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>

</html:form>

2、DLC.js

function getYear(makeName,url){
$.ajax({
  type:'post',
  url:url,
  success: function(html){$('#'+makeName).html(html);}
  });
}

3、Action

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>

...
<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;
}

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2010-08-06 16:12
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