ui:repeat h:selectManyCheckbox 我无法获取列表中的值

Question

我正在做一个 JSF 2.2 项目，jboss 8.x

我只使用 selectManyCheckbox 创建了一个动态表单。

我有以下代码：

<h:form>



                  <table border="5">


 <ui:repeat var="question" value="#{beanQuiz.traninigee.questions}">
      <tr> #{question.question} </tr>

      <tr>
        <h:selectManyCheckbox value="#{beanQuiz.questionAnswers[question]}"
                                      converter="javax.faces.Integer">
                    <f:selectItems  var="response"
                                    value="#{question.responses}"
                                    itemLabel="#{response.reponse}"
                                    itemValue="#{response.responseId}" />
                </h:selectManyCheckbox>
            </tr>
        </ui:repeat>

                </table>
 <h:commandButton value="Submit" action="result" styleClass="btn btn-success btn-cons m-b-10" />
        <h:commandButton value="Reset" type="reset"  styleClass="btn btn-warninig btn-cons m-b-10"/>

        </h:form>

selectedArticles 是实体列表。

我在网上看到 selectManyCheckbox 的值可以指向 String[] 或 List。使用此代码，selectedArticles 不包含所有选中的值，仅包含最新选中的组。

我应该怎么做才能获得所有选中的值？

@ManagedBean
@SessionScoped
public class beanQuiz implements Serializable{


    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @EJB
    private trainingServiceLocal local;

    private List<Integer> selectedreponses;

    private List<Training> trainings;

    private Training traninigee=new Training();



public String redirectquiz(int idt){

    traninigee=local.findtrainingbyId(idt);



    return "quiz";
}


    public List<Integer> getSelectedreponses() {
        return selectedreponses;
    }

    public void setSelectedreponses(List<Integer> selectedreponses) {
        this.selectedreponses = selectedreponses;
    }

    public int getInc() {
        return inc;
    }

    public void setInc(int inc) {
        this.inc = inc;
    }


    private int inc;

    public Training getTraninigee() {
        return traninigee;
    }

    public void setTraninigee(Training traninigee) {
        this.traninigee = traninigee;
    }

    @PostConstruct
    public void init() {
        inc=0;
        trainings = local.findAlltrainings();


        //traninigee=local.findtrainingbyId(1);
        //System.out.println("-----||||||||||||----**---"+traninigee);




    }


//  private static Map<String,Object> color2Value;
//  static{
//      color2Value = new LinkedHashMap<String,Object>();
//      for()
//      color2Value.put("Color2 - Red", "Red"); //label, value
//      
//  }





    public List<Training> getTrainings() {
        return trainings;
    }




    public void setTrainings(List<Training> trainings) {
        this.trainings = trainings;
    }

我的 class 图是这样的：我有 class 的培训，其中包含问题列表 (onetomany) 我的 class 问题包含回复列表（一对多）我的 class 响应是一个简单的 class，其中包含作为字符串的响应我正在使用 jpa

Classe Training 
{
    @OneToMany(fetch = FetchType.EAGER,mappedBy="training")
    private List<Question> questions;
}



classe Question 

{

@OneToMany(mappedBy="question",cascade=CascadeType.ALL,fetch=FetchType.LAZY)
    private List<Respons> responses;

}




classe response {
@Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int responseId;
    private Boolean isValid;

    //bi-directional many-to-one association to Question

}

我的列表测验 expl .xhtml

<ui:repeat var="cat" value="#{beanQuiz.trainings}">




<h:commandButton action="#{beanQuiz.redirectquiz(cat.trainingId)}" value="#{cat.name} " styleClass="btn btn-block btn-success">




</h:commandButton>





<br></br>

</ui:repeat>

和我的结果页面，我将在其中显示选中的选择框的结果

      <h:form>

           <p>selected responses: </p>

            <br/>

            <p>#{}</p>

 <c:forEach items="#{beanQuiz.questionAnswers.values()}" var="res">


                <p> #{res}</p>
<p>------------</p>
                <br></br>

</c:forEach>
        </h:form>

Answer 1

好的，这是你必须做的：

a) 通过删除 List 并将其替换为将问题与答案列表配对的 Map 来修改 Backing Bean：

@ManagedBean
@SessionScoped
public class BackingBean implements Serializable{


@EJB
private wagentServiceLocal local;

private Training training=new Training();

private Map<Question, List<Integer>> questionAnswers
        = new HashMap<Question, List<Integer>>();

 // When setting up the training to be used in the multiChebox tag
 // set up the map of question to list of chosen responses.
 public String redirectquiz(int idt){

     training=local.findtrainingbyId(idt);

     for(Question question: traninigee.getQuestions()){
           questionAnswers.put(question, new ArrayList<Integer>());            
     }

     return "quiz";
 }

public Map<Question, List<Integer>> getQuestionAnswers() {
    return questionAnswers;
}

public void setQuestionAnswers(Map<Question
              , List<Integer>>     questionAnswers) {
    this.questionAnswers = questionAnswers;
}

b) 您修改 selectManyCheckBox 以对每个问题使用单独的列表：

<ui:repeat var="question" value="#{beanQuiz.training.questions}">
      <tr >#{question.question} :
      </tr>
      <tr>
        <h:selectManyCheckbox value="#{beanQuiz.questionAnswers[question]}"
                                      converter="javax.faces.Integer">
                    <f:selectItems  var="response"
                                    value="#{question.responses}"
                                    itemLabel="#{response.name}"
                                    itemValue="#{response.id}" />
                </h:selectManyCheckbox>
            </tr>
        </ui:repeat>

多亏了这一点，每组复选框都会有自己的列表对象，不会受到其他组的干扰。您只需更改提取每个问题结果的方式或使用 'questionAnswers.values();' 的逻辑，迭代并组合所有问题的回答。

希望对您有所帮助

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