如何在Spring MVC中将输入元素绑定到数组列表元素？

Question

如何在Spring MVC中将输入元素绑定到数组列表元素？

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，它们表示evaluatedId、evaluatorId、evoluatorName和evaluatedName的字段-

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>

而不是这个< code > add assignment . options[$ { vs . index }]。evaluatedId

使用这个 -

或者您可以使用arraylist get获得价值-