Question

如何将输入元素绑定到Spring MVC中的arraylist元素？

视图模型：

public class AssigneesViewModel {

    private int evaluatorId;
    private int evaluatedId;
    private String evaluatorName;
    private String evalueatedName;
    //getters and setters
}

模型属性：

public class AssignEvaluationForm{
   private ArrayList<AssigneesViewModel> options;
   public ArrayList<AssigneesViewModel> getOptions() {
      return options;
   }

   public void setOptions(ArrayList<AssigneesViewModel> options) {
      this.options = options;
   }
}

控制器

@RequestMapping(value="addAssignment", method = RequestMethod.GET)
public String addAssignment(Model model){
     model.addAttribute("addAssignment", new AssignEvaluationForm());
     return "addAssignment";
}

然后在jsp中我有4个隐藏的输入，它们代表evaluateId，evaluatorId，evaluatorName，evaluateName - ＆gt;的字段。选项[0]。我将如何编写jsp代码以使用arrayList的元素映射这些输入？

更新

<form:form commandName="addAssignment" modelAttribute="addAssignment" id="addAssignment" method="POST">
//..........
     <c:forEach items="${addAssignment.options}" var="option" varStatus="vs">
         <div id="assigneesOptions" >    
             <form:input path="addAssignment.options[${vs.index}].evaluatedId" value="1"></form:input>
         </div>
    </c:forEach>
 //..............
</form:form>

通过此更新，我收到以下错误：

java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'options[]' available as request attribute

Answer 1

<form:input path="addAssignment.options[${vs.index}].evaluatedId" value="1"></form:input>

而不是addAssignment.options[${vs.index}].evaluatedId

使用此 - ＆gt; option.evaluatedId

或者你可以通过arraylist get获得价值 - ＆gt; ${addAssignment.options.get(vs.index).evaluatedId}，试着证明$ {} jstl调用大括号。顺便说一句，我不确定这最后一个例子是否适用于path =＆＃34;＆＃34;属性。

如何将输入元素绑定到Spring MVC中的arraylist元素？

1 个答案: