無效的工作

Question

我的views.There製作的Spring MVC應用程序和使用Velocity模板的形式是由數據並以這種形式，我使用＃springFormSingleSelect.Form填充它正常工作時的數據是有效的，但是當形式由無效數據填充提到有與錯誤的消息，但#springFormSingleSelect是empty.That的我的觀點：

<form action="saveEmployee" method="POST"> 
       #springBind("newEmployee") 
      <a href="listEmployees">#springMessage("label.back")</a> 
      <p> 
      <table>     
       <tr> 
        <td>#springMessage("label.firstName")</td> 
        <td>#springFormInput("newEmployee.firstName" "")</td> 
        <td><font color="red">#springShowErrors("&nbsp" "")</font></td> 
       </tr> 
       <tr> 
        <td>#springMessage("label.lastName")</td> 
        <td>#springFormInput("newEmployee.lastName" "")</td> 
        <td><font color="red">#springShowErrors("&nbsp" "")</font></td> 
       </tr> 
       <tr> 
        <td>#springMessage("label.salary")</td> 
        <td>#springFormInput("newEmployee.salary" "")</td> 
        <td><font color="red">#springShowErrors("&nbsp" "")</font></td> 
       </tr> 
       <tr> 
        <td>#springMessage("label.birthdate")</td> 
        <td>#springFormInput("newEmployee.birthday" "")</td> 
        <td><font color="red">#springShowErrors("&nbsp" "")</font></td> 
       </tr> 
       <tr> 
        <td>#springMessage("label.departament")</td> 
        <td>#springFormSingleSelect("newEmployee.departamentId" $departamentsMap "")</td> 
       </tr> 

      </table> 
        <input type="submit" value="#springMessage("label.submit")"> 
     </form> 

這是控制器到視圖的一部分：

@RequestMapping(value="/saveEmployee", method= RequestMethod.GET) 
    public ModelAndView newuserForm(){ 
     ModelAndView model = new ModelAndView("newEmployee"); 
     Employee empl = new Employee(); 

     Map departamentsMap = new TreeMap(); 
     List<Departament> departamentsList = service.listDepartaments(); 

     //for singleselect of departaments 
     for(int i=0; i<departamentsList.size(); i++){ 
      Departament dep = departamentsList.get(i); 
      departamentsMap.put(dep.getDepartamentId(),dep.getTitle()); 
     }      
     model.addObject("departamentsMap",departamentsMap); 

     model.getModelMap().put("newEmployee", empl); 
     return model; 
    } 

    @RequestMapping(value="/saveEmployee", method=RequestMethod.POST) 
    public String create(@ModelAttribute("newEmployee")Employee empl, BindingResult result){ 

     employeeValidator.validate(empl, result); 
     if(result.hasErrors()){ 
      return "newEmployee"; 
     } 
     service.saveEmployee(empl); 
     return "redirect:/listEmployees"; 
    } 

也許有人知道這個原因行爲？

Answer 1

departamentsMap是在錯誤的時間空......所以，請加model.addObject（ 「departamentsMap」，departamentsMap）; 在你的發佈細節中，所以當發生發生時，它不能爲空。

//Modified this line of code.. 


if(result.hasErrors()){ 
     Map departamentsMap = new TreeMap(); 
     List<Departament> departamentsList = service.listDepartaments(); 

     //for singleselect of departaments 
     for(int i=0; i<departamentsList.size(); i++){ 
      Departament dep = departamentsList.get(i); 
      departamentsMap.put(dep.getDepartamentId(),dep.getTitle()); 
     }      
     model.addObject("departamentsMap",departamentsMap); 


    return "newEmployee"; 
     }