javascript - Grails+Javascript 使用 Set、List

Question

我只想迭代我的 DomainModel 数据中的列表或集合。

 for(var report in ${reportInstanceList.toSet()}) {

       var postalcode= report.postalcode;
       alert(postalcode);

     }

But i get always from Mozilla: "missing ] after element list" ---->
"for(var report in [fire.report : 4, fire.report : 1, fire.report : 5, fire.report : 2, fire.report : 3]) {..."

from Opera: "Syntax error at line 18 while loading: syntax error t in [fire.report : 1, fire.report : --------------------^"

I tried also with toList(). And i tried another syntax, like : '${reportInstanceList.toSet()}' "${reportInstanceList.toSet()}"

But it dont work, it must be a little problem but i dont get it...

谢谢

Answer 1

我假设您正在尝试在 GSP 模板中编写一些 Javascript？如果是这样，您需要将 Groovy 对象转换为 Javascript 代码可以使用的对象，通常是 JSON:

<%! import grails.converters.JSON %>

...

    for(var report in ${reportInstanceList as JSON}) {
    ...

更新:

事实证明序列化工作正常，但数组上的迭代是错误的。使用这样的东西:

var reportsList = ${reportInstanceList as JSON};
for (var i=0; i<reportsList.length; i++) {
    var report = reportsList[i];

    // do something with your report, e.g.
    alert(report.postalcode);
}

通常不应使用 for (... in ...) 方法来迭代数组。