PrimeFaces selectOneMenu不呈現圖像和字符串

Question

我正在使用PrimeFaces selectOneMenu在它們旁邊顯示一些圖像和字符串，我只關心圖像旁邊的字符串，圖像本身僅用於顯示，我嘗試了此操作，但沒有成功：

<p:selectOneMenu id="SkinChooser"
        value="#{personBean.skin}" panelStyle="width:150px"
               effect="fade" var="s" style="width:160px">
       <f:selectItem itemLabel="Select One" itemValue="" />
      <f:selectItems value="#{personBean.selectedSkins}"
               var="skin" itemLabel="#{skin.skinType}" itemValue="#{skin}" />
      <p:column>
               <p:graphicImage value="/resources/images/skin/#{s.skinPhoto}" />
      </p:column>
      <p:column>  
               #{s.skinType}  
     </p:column>
</p:selectOneMenu>



    public class Skin {
          String skinPhoto;
          String skinType;

         public Skin() {}

         public Skin(String photo, String type) {}

         public String getSkinPhoto() {return skinPhoto;}

         public void setSkinPhoto(String skinPhoto) {
                this.skinPhoto = skinPhoto;
         }

        public String getSkinType() {
                  return skinType;
         }

        public void setSkinType(String skinType) {
                   this.skinType = skinType;
         }
        @Override
            public String toString() {
                           return skinType;
             }
       }

在bean personBean內部，我按如下方式初始化ArrayList selectedSkins ：

這是personBean：

@ManagedBean(name = "personBean")
@SessionScoped
 public class ReportPerson {
private Skin skin;
private static List<Skin> selectedSkins;


static {
    System.err.println("Array is filled");
    selectedSkins = new ArrayList<Skin>();
    selectedSkins.add(new Skin("1", "Pale white"));
    selectedSkins.add(new Skin("2", "Fair white"));
    selectedSkins.add(new Skin("3", "Light brown"));
    selectedSkins.add(new Skin("4", "Moderate brown"));
    selectedSkins.add(new Skin("5", "Dark brown"));
    selectedSkins.add(new Skin("6", "Deeply pigmented"));
    System.err.println("Finished Filling");

}

public List<Skin> getSelectedSkins() {
    return selectedSkins;
}

public void setSelectedSkins(List<Skin> selectedSkins) {
    this.selectedSkins = selectedSkins;
}

public Skin getSkin() {
    return skin;
}

public void setSkin(Skin skin) {
    this.skin = skin;
        }

    }

但是selectOneMenu組件仍然無法呈現任何內容！

Answer 1

您缺少轉換器。

@ManagedBean(name = "skinConverter")
public class SkinConverter implements Serializable, Converter {

/** Serial Version UID. */
private static final long serialVersionUID = 3661819160508007879L;

@ManagedProperty(value = "#{personBean}")
private PersonBean personBean;

/**
 * Accesses the personBean
 * @return the personBean
 */
public final PersonBean getPersonBean() {
    return personBean;
}

/**
 * Sets the personBean
 * @param personBean the personBean to set
 */
public final void setPersonBean(final PersonBean personBean) {
    this.personBean = personBean;
}

/**
 * @see javax.faces.convert.Converter#getAsObject(javax.faces.context.FacesContext,
 *      javax.faces.component.UIComponent, java.lang.String)
 */
@Override
public Object getAsObject(final FacesContext facesContext, final UIComponent 
          component, final String submittedValue) {
    if (submittedValue.trim().equals("")) {
        return null;
    } else {
        for (Skin p : personBean.getSelectedSkins()) {
            if (p.getSkinType().equals(submittedValue)) {
                return p;
            }
        }
    }
    return null;

}

/**
 * @see javax.faces.convert.Converter#getAsString(javax.faces.context.FacesContext,
 *      javax.faces.component.UIComponent, java.lang.Object)
 */
@Override
public String getAsString(final FacesContext arg0, final UIComponent arg1, final Object value) {
    if (value == null || value.equals("")) {
        return "";
    } else {
        return String.valueOf(((Skin) value).getSkinType());
    }

}

}

Answer 2

為了將項目呈現為列，標記<f:selectItems>的屬性itemValue必須指向對象，而不是字符串。

您的情況是itemValue="#{skin}"是正確的。

如果您使用itemValue="skin"或itemValue="#{skin.type}" ，則該項目將顯示為普通文本，因為其類型為String 。

PrimeFaces源代碼將使其更加清晰。

參考： SelectOneMenu.java