本文介绍了如何将所有枚举值显示为< f:selectItems>枚举属性作为标签的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

限时删除!!

我有一个 RoleStatus 枚举,它作为一个属性 Role 实体映射到DB中的一个整数(但那部分是无关紧要的)。我想在< p:dataTable> 中呈现一个列表< Role> ,其中一列应对 Role RoleStatus 属性有< h:selectOneMenu> c $ c>实体。如何在中执行此操作?

I have a RoleStatus enum which is as being a property of Role entity mapped to an integer in the DB (but that part is irrelevant). I'd like to present a List<Role> in a <p:dataTable> in which one column should have a <h:selectOneMenu> for the RoleStatus property of the Role entity. How can I implement this with or without OmniFaces?

这是枚举:

public enum RoleStatus {

    ACTIVE(1, "Active"),
    DISABLE(2, "Disable");

    private final int intStatus;
    private final String status;

    private RoleStatus(int intStatus, String status) {
        this.intStatus = intStatus;
        this.status = status;
    }

    public int getIntStatus() {
        return status;
    }

    public String getStatus() {
        return status;
    }

}

这是支持bean: p>

Here's the backing bean:

@ManagedBean
@ViewScoped
public class RoleController {

    private List<Role> roles;

    @ManagedProperty("#{roleService}")
    private IRoleService roleService;

    @PostConstruct
    public void init() {
        roles = roleService.getRoles();
    }

    public List<Role> getRoles() {
        return roles;
    }

}

最后,数据表中我对于 RoleStatus 属性角色,希望有一个< h:selectOneMenu> 实体,显示所有可用的枚举值作为选择项目选项。

Finally, the data table where I'd like to have a <h:selectOneMenu> for the RoleStatus property of Role entity, showing all available enum values as select item options.

<h:form id="roleForm">
    <p:dataTable value="#{roleController.roles}" var="role">
        <p:column>
            <h:outputText value="#{role.roleid}" />
        </p:column>
        <p:column>
            <h:inputText value="#{role.role}" />
        </p:column>
        <p:column>
            <h:inputText value="#{role.description}" />
        </p:column>
        <p:column>
            <h:selectOneMenu value="#{role.roleStatus}">
                <!-- How??? -->
            </h:selectOneMenu>
        </p:column>
    </p:dataTable>
</h:form>

我该如何实现?我需要?

How can I achieve this? Do I need the OmniFaces SelectItemsConverter?

推荐答案

您不需要转换器。 JSF已经有一个内置的枚举转换器。

You don't need a converter. JSF has already a builtin enum converter.

没有OmniFaces,您可以将枚举值提供为< h:selectOneMenu> 的可用项:

Without OmniFaces, here's how you could provide the enum values as available items of <h:selectOneMenu>:


  1. 将此方法添加到 RoleController

public RoleStatus[] getRoleStatuses() {
    return RoleStatus.values();
}

这样,所有枚举值都可以通过# {roleController.roleStatuses}

This way, all enum values are available by #{roleController.roleStatuses}.

然后使用此下拉列表:

<h:selectOneMenu value="#{role.roleStatus}">
    <f:selectItems value="#{roleController.roleStatuses}" var="roleStatus"
        itemValue="#{roleStatus}" itemLabel="#{roleStatus.status}" />
</h:selectOneMenu>

注意:由于这些值为静态/全局应用,因此不会将方法移动到单独的 @ApplicationScoped bean。

Note: as those values are static/applicationwide, it doesn't hurt to move the method to a separate @ApplicationScoped bean.

使用OmniFaces,您可以删除额外的getter,并直接通过:

With OmniFaces, you could remove the additional getter and just import the enum directly via <o:importConstants>:


  1. 您的模板的顶部(假设它在 com.example 包中):

<o:importConstants type="com.example.RoleStatus" />

这样,枚举类本身可以通过#{RoleStatus} (注意大写!)

This way, the enum class itself is available by #{RoleStatus} (note the capitalization!).

然后使用此下拉列表:

<h:selectOneMenu value="#{role.roleStatus}">
    <f:selectItems value="#{RoleStatus.values()}" var="roleStatus"
        itemValue="#{roleStatus}" itemLabel="#{roleStatus.status}" />
</h:selectOneMenu>


这篇关于如何将所有枚举值显示为&lt; f:selectItems&gt;枚举属性作为标签的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

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09-07 00:31