primefaces 微调器的 ValueChangeEvent 为空

Question

我正在使用 Primefaces 和微调器组件。我想在单击微调器按钮的 changEvent 方法中进行检测。我希望我会得到 oldValue 和 newValue 但 ValueChangeEvent 为空。我是 Java EE 的新手。有人可以帮助我吗？我的英语也不太好。

这是我的一部分 index.xhtml:

<h:form> 
    <h:panelGrid columns="2" cellpadding="5" styleClass="ui-grid">
        <h:outputLabel for="ajaxSpinner" value="Ajax Spinner: " />
        <p:outputPanel>
            <p:spinner id="ajaxSpinner" value="#{spinnerView.number5}"  >
                <p:ajax event="valueChange" update="ajaxSpinnerValue" process="@this" listener="#{spinnerView.changeEvent(event)}" />
            </p:spinner>
            <h:outputText id="ajaxSpinnerValue" value="#{spinnerView.number5}" style="padding-left: 10px" />
        </p:outputPanel>
    </h:panelGrid>
</h:form>

这是Bean-Class

package test.ctrl;

import java.io.Serializable;
import javax.enterprise.context.SessionScoped;
import javax.faces.event.AjaxBehaviorEvent;
import javax.faces.event.ValueChangeEvent;
import javax.inject.Named;

@Named("spinnerView")
@SessionScoped
public class WebBean implements Serializable{
    private int number1;
    private int number2;
    private int number3;
    private int number4;
    private int number5;

    public int getNumber1() {
        return number1;
    }

    public void setNumber1(int number1) {
        this.number1 = number1;
    }

    public int getNumber2() {
        return number2;
    }

    public void setNumber2(int number2) {
        this.number2 = number2;
    }

    public int getNumber3() {
        return number3;
    }

    public void setNumber3(int number3) {
        this.number3 = number3;
    }

    public int getNumber4() {
        return number4;
    }

    public void setNumber4(int number4) {
        this.number4 = number4;
    }

    public int getNumber5() {
        return number5;
    }

    public void setNumber5(int number5) {

        this.number5 = number5;
    }

    public void callBean(){
        System.out.println("Ausgabe" + number5); 

    }

    public void changeEvent(ValueChangeEvent ev){
        System.out.println("Ausgabe:"+ev.getOldValue() +"--" +ev.getNewValue());
    }
}

Answer 1

我将 p:spiner 和 p:ajax 标签更改如下：

<p:spinner id="ajaxSpinner" value="#{spinnerView.number5}" valueChangeListener="#{spinnerView.changeEvent}" >
    <p:ajax  update="@form" process="@this, ajaxSpinner" />
</p:spinner>

primefaces 微调器的 ValueChangeEvent 为空

ValueChangeEvent for primefaces spinner is null

jsf

primefaces