从JSP列表填充JavaScript数组

Question

好吧也许有人可以帮助我解决我正在努力解决的问题.基本上我有一个JSP页面,它获取Country对象的列表(来自Spring Portlet SimpleFormController的方法referenceData(),不完全相关,但只是提到它).每个Country对象都有一组省对象,每个省和国家都有一个名称字段:

public class Country  {
    private String name;
    private Set<Province> provinces;

    //Getters and setters
}

public class Province {
    private String name;

    //Getters and setters
}

现在我在我的JSP中为国家和省份提供了两个下拉菜单,我希望按国家/地区筛选省份.我一直在关注本教程/指南,在JavaScript中进行链式选择.

现在我需要一种动态的方法来从我的内容创建JavaScript数组.在任何人提到AJAX之前,这是不可能的,因为我们的项目使用portlet,我们希望远离使用DWR等框架或创建servlet.这是我到目前为止的JavaScript/JSP,但它没有用任何东西填充数组:

var countries = new Array();
<c:forEach items="${countryList}" var="country" varStatus="status">
    countries[status.index] = new Array();
    countries[status.index]['country'] = ${country.name};
    countries[status.index]['provinces'] =
    [
        <c:forEach items="${country.provinces}" var="province" varStatus="provinceStatus">
            '${province.name}'
            <c:if test="${!provinceStatus.last}">
              ,
            </c:if>
        </c:forEach>
    ];
</c:forEach>

有没有人知道如何在JSP中创建一个JavaScript数组,或者在这种情况下会考虑"最佳实践"？提前致谢!

Answer 1

var countries = new Array();
<c:forEach items="${countryList}" var="country" varStatus="status"> 
    countryDetails = new Object();
    countryDetails.country = ${country.name}; 
    var provinces = new Array();

        <c:forEach items="${country.provinces}" var="province" varStatus="provinceStatus"> 
           provinces.push(${province.name});
        </c:forEach> 
    countryDetails.provinces = provinces;
    countries.push(countryDetails);
</c:forEach> 

现在你所拥有的是javascript中的这样的东西

var countries = [
  {country:"USA",
  provinces: [
    "Ohio",
    "New York",
    "California"
  ]},
  {country:"Canada",
  provinces: [
    "Ontario",
    "Northern Territory",
    "Sascetchewan"
  ]},
]

另一种选择是让你的输出看起来像我发布的javascript.

var countries = [
<c:forEach items="${countryList}" var="country" varStatus="status">  
    {country: '${country.name}',
    provinces : [ 
        <c:forEach items="${country.provinces}" var="province" varStatus="provinceStatus">  
           '${province.name}'
           <c:if test="${!provinceStatus.last}">    
             ,    
           </c:if>   
        </c:forEach>  
    ]}
    <c:if test="${!status.last}">    
      ,    
    </c:if>  
    </c:forEach>  
];