ng-change不起作用，ng-change后数据未加载

Question

我在<select>类中添加了data-ng-change='getSubjectsClasswise(classBean.class_id);'标签，但主题未在主题<select>标签上加载。

一切看起来不错，没有得到的问题，请帮助我。

JSP：

<div data-ng-controller='ChapterController'> 
<form class="form-horizontal"> 
    <div class="form-group"> 
     <label class="control-label col-sm-3">Select Class * :</label> 
     <div class="col-sm-8"> 
      <div class="col-sm-6"> 
       <select data-ng-model='classBean.class_id' data-ng-change='getSubjectsClasswise(classBean.class_id);' class="form-control" name='stdClass' required> 
        <option value="">--SELECT--</option> 
        <option data-ng-repeat='c in clss' value="{{ c.class_id}}">{{ c.class_name}}</option> 
       </select> 
      </div> 
     </div> 
    </div> 
    <div class="form-group"> 
     <label class="control-label col-sm-3">Select Subject * :</label> 
     <div class="col-sm-8"> 
      <div class="col-sm-6"> 
       <select data-ng-model='sid' class="form-control" required> 
        <option value="">--SELECT--</option> 
        <option data-ng-repeat='s in subss' value="{{ s.sid}}">{{ s.subject_name}}</option> 
       </select> 
      </div> 
     </div> 
    </div> 
    <div class="btn-right"> 
     <button type="submit" value="Register" class="btn btn-primary">Register</button> 
    </div> 
</form> 

JS控制器：

'use strict'; 
var app = angular.module("CareerTurn"); 
app.controller('ChapterController', function($scope, $http, $location, $window, AdminService) { 

getClasses(); 

function getClasses() { 
    $http({ 
     method : 'GET', 
     url : 'http://localhost:8015/CareerTurn/adm/getClasses.do' 
    }).then(function successCallback(response) { 
     $scope.clss = response.data; 
    }, function errorCallback(response) { 
     console.log(response.statusText); 
    }); 
} 

$scope.getSubjectsClasswise = function(class_id) { 
    alert(class_id); 
    var URL ='http://localhost:8015/CareerTurn/adm/getClasswiseSubjects.do'; 
    $http.post(URL,class_id).success(function(response){ 
     $scope.subss = response.data; 
    }).error(function(reponse){ 
     alert('error'); 
    }); 
} 

}）;

Java的控制器：

@RequestMapping(value="/getClasswiseSubjects.do", method=RequestMethod.POST) 
public @ResponseBody List<SubjectBean> getClasswiseSubjects(@RequestBody int class_ids) { 
    return getAdminService().getClasswiseSubjects(class_ids); 
} 

@RequestMapping(value="/getClasses.do", method=RequestMethod.GET) 
public List<ClassBean> getClasses() { 
    return getAdminService().getClasses(); 
} 

DaoImpl：

@Override 
public List<ClassBean> getClasses() { 
    try{ 
     String sql="from ClassBean"; 
     query = em.createQuery(sql); 
     return query.getResultList(); 
    }catch(Exception ex){ 
     ex.printStackTrace(); 
    } 
    return null; 
} 

@Override 
public List<SubjectBean> getClasswiseSubjects(int class_id) { 
    try{ 
     query = em.createQuery("from SubjectBean sb where sb.classBean.class_id=:class_id"); 
     query.setParameter("class_id", class_id); 
     List<SubjectBean> subs = query.getResultList(); 
     return subs; 
    }catch(Exception ex){ 
     ex.printStackTrace(); 
    } 
    return null; 
} 

控制台：

Hibernate: select classbean0_.class_id as class1_1_, classbean0_.class_createdate as class2_1_, classbean0_.class_createdby as class3_1_, classbean0_.class_name as class4_1_ from exam_class classbean0_ 
Hibernate: select subjectbea0_.sid as sid26_, subjectbea0_.class_id as class6_26_, subjectbea0_.subject_code as subject2_26_, subjectbea0_.subject_createdate as subject3_26_, subjectbea0_.subject_createdby as subject4_26_, subjectbea0_.subject_name as subject5_26_ from subjects_tbl subjectbea0_ where subjectbea0_.class_id=? 

Answer 1

变化response.data做到这response

.success(function(response){ 
     $scope.subss = response; 
    }).error(function(reponse){ 
     alert('error'); 
    });