Question

我有以下addService.xhtml

<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>Add Service</title></h:head>
<h:body>
    <h:form>
        <p:outputLabel for="name" value="Service Name" />
        <p:inputText id="name" value="#{serviceMB.name}"></p:inputText>

        <p:outputLabel for="categoryCompId" value="Service Category" />
        <p:selectOneMenu id="categoryCompId" value="#{serviceMB.selectedCategory}" >
            <f:selectItem itemLabel="Select Category" itemValue="" noSelectionOption="true" />
            <f:selectItems value="#{serviceMB.categories}" var="category" itemLabel="#{category.name}" itemValue="#{category}"/>
        </p:selectOneMenu>
        <p:commandButton id="saveService" value="Save" action="#{serviceMB.saveServiceAndExit}"/>
    </h:form>
</h:body>

以下托管bean

@Component
@Controller
@Scope(value = "request")
@ManagedBean(name="serviceMB")
@RequestScoped
public class ServicesManagedBean implements Serializable {
    private Category selectedCategory;
    private String name;
    public Category getSelectedCategory() {
        return selectedCategory;
    }
    public void setSelectedCategory(Category selectedCategory) {
        this.selectedCategory = selectedCategory;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public List<Category> getCategories() {
        return categoryService.getCategories();
    }

}

setSelectedCategory()方法无法调用，selectedCategory字段始终为空，但我在<p:selectOneMenu中使用它。我的代码有什么问题吗？

我添加了转换器，但是当我使用Object selectedObject = ((HtmlSelectOneMenu) arg1).getValue();时，它也会返回null。

Answer 1

您只能在JSF输入中传递字符串和基本类型。对于复杂对象，您需要转换器：

<p:selectOneMenu id="categoryCompId" value="#{serviceMB.selectedCategory}" 
    converter="categoryConverter">
    <f:selectItem itemLabel="Select Category" itemValue="#{null}" noSelectionOption="true" />
    <f:selectItems value="#{serviceMB.categories}" var="category" itemLabel="#{category.name}" itemValue="#{category}"/>
</p:selectOneMenu>

如何从selectOneMenu组件中获取所选项的值？

1 个答案: