Question

我的问题如下。

我想用JSF进行问卷调查，我想在整个页面上增加一个计数器。可能是最好的方法是设置一个ajax事件。

这是index.xhtml：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui">
<h:head>
    <title>Test</title>
</h:head>

<h:body>

    Question :
    <h:form id="questionForm">

        <h:outputLabel value="#{questionBean.questions[0].askedQuestion}">
        </h:outputLabel>

        <h:selectOneRadio>
            <f:selectItems value="#{questionBean.questions[0].proposals}"
                var="proposal" itemValue="#{proposal}" />
        </h:selectOneRadio>

    </h:form>

</h:body>
</html>

正如您所注意到的，第一个问题的值是创建的列表的第一个元素。我想设置一个计数器，以便在每次点击时转到n + 1个问题。

这是questionBean：

package trainforjava.question;

import java.util.Collections;
import java.util.List;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;

@Controller
public class QuestionBean {

    static Logger log = Logger.getLogger(QuestionBean.class.getName());

    private List<Question> questions;
    private int counter = 0;

    public QuestionBean() {
        QuestionCreator creator = new QuestionCreator();
        questions = creator.createQuestions();
        System.out.println(questions);
        Collections.shuffle(questions);
        System.out.println(questions);
        log.info(questions);

    }

    public List<Question> getQuestions() {
        return questions;
    }

    public void setQuestions(List<Question> questions) {
        this.questions = questions;
    }

    public int getCounter() {
        return counter;
    }

    public void setCounter(int counter) {
        this.counter = counter;
    }

    public int increment() {
        counter++;
        return counter;

    }

}

我想将方法increment（）作为页面的参数引用，然后在问卷中将其递增。我尝试使用，但它只是支持bean。

有人可以帮我这个吗？

谢谢你

Answer 1

谢谢。我发布了如何实现它。我不知道它是否真的优化了，但它是一个提议：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui">
<h:head>
    <title>Test</title>
</h:head>

<h:body>

    Question :
    <h:form id="questionForm">

        <h:outputLabel
            value="#{questionBean.questions[questionBean.counter].askedQuestion}">
        </h:outputLabel>

        <h:selectOneRadio>
            <f:selectItems value="#{questionBean.questions[questionBean.counter].proposals}"
                var="proposal" itemValue="#{proposal}" />
        </h:selectOneRadio>

        <h:link value="Question suivante" outcome="index.xhtml"/>

        <f:metadata>
            <f:viewParam name="id" value="#{questionBean.counter}" />
            <f:viewAction action="#{questionBean.increment()}" />
        </f:metadata>

    </h:form>

</h:body>
</html>

这是豆子;

package trainforjava.question;

import java.util.Collections;
import java.util.List;

import org.apache.log4j.Logger;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;

//@ManagedBean
//@ApplicationScoped
@Controller
@Scope(value = "session")
public class QuestionBean {

    static Logger log = Logger.getLogger(QuestionBean.class.getName());

    private List<Question> questions;
    private int counter;
    private User user;

    public QuestionBean() {
        counter = -1;
        QuestionCreator creator = new QuestionCreator();
        questions = creator.createQuestions();
        Collections.shuffle(questions);
        System.out.println(questions);

    }

    public List<Question> getQuestions() {
        return questions;
    }

    public void setQuestions(List<Question> questions) {
        this.questions = questions;
    }

    public int getCounter() {
        return counter;
    }

    public void setCounter(int counter) {
        this.counter = counter;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String increment() {

        System.out.println("counter " + counter);
        counter += 1;

        if (counter > 2) {
            System.out.println("counter < 2");
            return "results";

        }

        System.out.println("counter " + counter);
        return "index";

    }

}

我只是没有设法将变量设置为“questionBean.counter”。

如何在JSF页面上增加一个变量集？

1 个答案: