Question

我的选项列表存在问题。显示源和目标有效，但是当按下命令按钮时，它会调用选项列表的设置者并清空选项列表的源和目标。之后，它调用connectTags（）方法。

这种行为的原因是什么，我该如何解决？

<h:form>
    <p:pickList id="pickList" value="#{employeeEditController.dualListTags}"
        var="tag" itemLabel="#{tag.value}" itemValue="#{tag}">
        <f:facet name="sourceCaption">Available</f:facet>
        <f:facet name="targetCaption">Connected</f:facet>  
    </p:pickList>
    <p:commandButton value="Save" actionListener="#{employeeEditController.connectTag()}"/>
</h:form>

豆：

@Named(value = "employeeEditController")
@SessionScoped
public class EmployeeEditController implements Serializable, IEditController {
    private Employee selectedEmployee;
    private DualListModel<Tags> dualListTags;

@Inject
private EmployeeFacade employeeFacade;
@Inject
private CompanyFacade companyFacade;
@Inject
private TagFacade tagFacade;

public void setSelectedEmployee(Employee selectedEmployee) {
    System.out.println("setSelectedEmployee called. Value: " + selectedEmployee.getFirstName());
    this.selectedEmployee = selectedEmployee;
    this.refreshDualList();
}

private void refreshDualList(){
    List<Tags> source = (List<Tags>) this.getCompanyTags();
    List<Tags> target = (List<Tags>) this.getTags();
    System.out.println("refreshDualList called. \nSource: " + source.size() +
            "Target: " + target.size());
    this.dualListTags = new DualListModel<Tags>(source, target);
}

public Collection<Tags> getTags(){
    Collection<Tags> retVal;
    if(this.selectedEmployee != null){
        retVal = this.selectedEmployee.getTags();
        if(retVal == null){
           retVal = new ArrayList<Tags>();
        } 
    } else{
        System.out.println("selected emp is null");
        retVal = new ArrayList<Tags>();
    }
    return retVal;
}

public Collection<Tags> getCompanyTags() {
    Collection<Tags> retVal = new ArrayList<Tags>();
    if(this.companyID == null){
        String userstr = FacesContext.getCurrentInstance().getExternalContext().getRemoteUser();
        this.companyID = this.companyFacade.getCompanyIDByUser(userstr);
    }
    retVal = this.tagFacade.getTagsFromCompanyID(companyID);
    return retVal;
}

public void save(){
    if(this.selectedEmployee != null){
        System.out.println("Save called. Value: " + this.selectedEmployee.getFirstName());
        this.employeeFacade.edit(this.selectedEmployee);
    }
}

public void connectTag() {
    if(this.dualListTags != null){
        System.out.println("connectTag() called.\n" + "source: " + this.dualListTags.getSource().size() + 
                "\ntarget: " + this.dualListTags.getTarget().size());
        this.selectedEmployee.setTags((Collection<Tags>)this.dualListTags.getTarget());
        this.save();
    }
}

public DualListModel<Tags> getDualListTags() {
    System.out.println("getDualList called. \nSource :" + this.dualListTags.getSource().size()
            + "\nTargets: " + this.dualListTags.getTarget().size());
    return this.dualListTags; 
}

public void setDualListTags(DualListModel<Tags> dualListTags) {
    System.out.println("setDualList called. \nSource :" + this.dualListTags.getSource().size()
            + "\nTargets: " + this.dualListTags.getTarget().size());
    this.dualListTags = dualListTags;
    System.out.println("setDualList called after set. \nSource :" + this.dualListTags.getSource().size()
                + "\nTargets: " + this.dualListTags.getTarget().size());
    }

}

Answer 1

我遇到了同样的问题，似乎解决方案是为您在选项列表中使用的实体强制使用自定义转换器。

这是我的自定义转换器的样子：

@ViewScoped
@ManagedBean(name = "vehicleGroupConverter")
public class VehicleGroupConverter implements Converter {

    @ManagedProperty(value = "#{vehiclesBean}")
    private VehiclesBean vehiclesBean;

    @Override
    public Object getAsObject(FacesContext context, UIComponent component,
            String value) {
        long groupId = Long.parseLong(value);
        List<AssetCategory> groups = vehiclesBean.getVehicleGroups();
        for (AssetCategory group : groups) {
            if (group.getCategoryId() == groupId) {
                return group;
            }
        }
        return null;
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component,
            Object value) {
        return Long.toString(((AssetCategory) value).getCategoryId());
    }

    public void setVehiclesBean(VehiclesBean vehiclesBean) {
        this.vehiclesBean = vehiclesBean;
    }

}

这是选项列表模板部分：

<p:pickList id="vehicleGroups" 
        value="#{vehiclesBean.selectedVehicleGroups}" 
        var="group" 
        itemLabel="#{group.name}" 
        itemValue="#{group}"
        converter="#{vehicleGroupConverter}"
        styleClass="pf-panel-grid"
        style="margin-bottom:10px">
    <f:facet name="sourceCaption">#{i18n['label-available-groups']}</f:facet>
    <f:facet name="targetCaption">#{i18n['label-assigned-groups']}</f:facet>
</p:pickList>

Answer 2

当源或目标不为空时设置duallistmodel：

public void setDualListTags(DualListModel<Tags> dualListTags) {
    if(this.dualListTags.getSource().size()!=0 && this.dualListTags.getTarget().size()!=0) {
        this.dualListTags = dualListTags;
    }
}

Primefaces选项列表。 DualListModel的Setter删除源和目标

2 个答案: