[论坛提问] ajax json 问题

本帖最后由王建亮于 2015-3-30 17:18 编辑

在做一个三级联动的时候出了问题，求大侠解救。。。
这个是struts2的配置
<package name="struts2" namespace="/" extends="json-default">
<action name="countryAction" class="countryAction">
            <result type="json"></result>
      </action>
      <action name="provinceAction" class="provinceAction">
            <result type="json"></result>
      </action>
      <action name="cityAction" class="cityAction">
            <result type="json"></result>
      </action>
      <action name="townAction" class="townAction">
            <result type="json"></result>
      </action>
</package>

这个是具体的Action
package com.youyou.action;

import java.util.List;

import org.apache.struts2.json.annotations.JSON;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

import com.opensymphony.xwork2.ActionContext;
import com.youyou.base.BaseAction;
import com.youyou.domain.City;
import com.youyou.domain.Province;

@Component
@Scope("prototype")
public class CityAction extends BaseAction<City>{

      /**
      *
      */
      private static final long serialVersionUID = 5493014910574642405L;
      private Long provinceId;
      private List<City> cities;
      public String getCityInfo() {
            System.out.println("---》cityaction");
            provinceId = 1L;
            Province province = provinceService.findById(provinceId);
            cities = cityService.findByProvince(province);
            System.out.println("城市的个数为："+ cities.size());
            System.out.println("provinceId22="+provinceId);
            return SUCCESS;
      }

      public Long getProvinceId() {
            return provinceId;
      }

      public void setProvinceId(Long provinceId) {
            this.provinceId = provinceId;
      }


      public List<City> getCities() {
            return cities;
      }


      public void setCities(List<City> cities) {
            this.cities = cities;
      }
}

这个是jsp页面
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags"  %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
  <head>
<title>My JSP 'index.jsp' starting page</title>
<script type="text/javascript" src="style/js/jquery-1.3.1.js"></script></head>
   <body>
   <script type="text/javascript">
               function getCity() {
                        var sUrl = "cityAction!getCityInfo.action";
               var xmlHttp = createxmlHttp();
               xmlHttp.onreadystatechange = function() {
                  if(xmlHttp.readyState == 4) {
                                 alert("come back");
                                 var data = eval("(" + xmlHttp.responseText + ")");//报错  Uncaugh SyntaxError:Unexpected token <
                                 alert("comesss");
                                 alert(data.cities[1].name);
                                    for(var dex = 0 ; dex < data.cities.length ; dex++) {
                                             var $option = $("<option></option>");
                                                $option.attr("value", data.cities[dex].id);
                                          $option.text(data.cities[dex].name);
                                          $("#city").append($option);
                                    }
                  }
               };
               xmlHttp.open('POST', sUrl,true);
               xmlHttp.send(null);
         }

            //create xmlHttp
            function createxmlHttp() {
                     var xmlHttp;
                     try {
                        // Firefox, Opera 8.0+, Safari
                        xmlHttp=new XMLHttpRequest();
                  }
                  catch (e)
                  {
                     // Internet Explorer
                     try
                        {
                           xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
                        }
                        catch (e)
                     {
                           try
                              {
                                 xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
                              }
                              catch (e)
                              {
                                 alert("您的浏览器不支持AJAX！");
                              }
                        }
         }

                  return xmlHttp;
}

function getProvince() {
               var sUrl = "provinceAction!getProvinceInfo.action";
      var xmlHttp = createxmlHttp();
      xmlHttp.onreadystatechange = function() {
         if(xmlHttp.readyState == 4) {
               var data = eval("(" + xmlHttp.responseText + ")");
                     for(var dex = 0 ; dex < data.provinces.length ; dex++) {
                                       var $option = $("<option></option>");
                                       $option.attr("value", data.provinces[dex].id);
                                 $option.text(data.provinces[dex].name);
                                 $("#province").append($option);
                     }
         }
      };
      xmlHttp.open('POST', sUrl,true);
      xmlHttp.send(null);




}

</script>
                           <input type="button" value="ajax"/>
            <div class="d">
            <select id="province"></select>
         <select id="city"></select>
         <select id="town"></select>
         </div>

</body>
</html>问题描述：总是得不到从后台发过来的数据，，，
报错：  Uncaugh SyntaxError:Unexpected token <
网上找了好多都不行。。。

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[论坛提问] ajax json 问题

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