我可以在Primefaces中有两个<p：focus>标签吗？

Question

我希望我的网页专注于需要更多操作的字段。我按照this示例来实现它，它使用<p:focus context="panel"/>标记完美运行。如果有任何字段需要值且为空，它将自动关注该特定字段。

当我想从bean设置焦点时，问题出现了。我使用<p:focus id="focusID" for="#{yourBean.focusProperty}" />关注this来设置焦点，但是有效，但第一个标记<p:focus context="panel"/>不再有效。这意味着当必填字段为空时，它不会关注该字段，而是始终关注表单的第一个字段。以下是我的代码：

<p:panel id="formPanel" header="Register">
    <p:messages id="messages" showDetail="true" autoUpdate="true" closable="true" globalOnly="true" />
    <p:focus context="formPanel" />
    <h:form>
        <p:focus id="focusID" for="#{registerBean.focusProperty}"/>
        <h:panelGrid columns="3" cellpadding="5">
            <p:outputLabel for="name" value="Name: " />
            <p:inputText id="name" value="#{registerBean.profile.name}" required="true"/>
            <p:message for="name"/>

            <p:outputLabel for="tp" value="TP: " />
            <p:inputText id="tp" value="#{registerBean.student.tp}" required="true"/>
            <p:message for="tp"/>

            <p:outputLabel for="email" value="Email: " />
            <p:inputText id="email" value="#{registerBean.account.email}" required="true"/>
            <p:message for="email"/>

            <p:outputLabel for="username" value="Username: " />
            <p:inputText id="username" value="#{registerBean.account.username}" required="true"/>
            <p:message for="username"/>

            <p:outputLabel for="password" value="Password: " />
            <p:password id="password" value="#{registerBean.account.password}" required="true" />
            <p:message for="password"/>

            <p:outputLabel for="confirmPassword" value="Confirm Password: " />
            <p:password id="confirmPassword" value="#{registerBean.confirmPassword}" required="true" />
            <p:message for="confirmPassword"/>

            <p:commandButton value="Register" action="#{registerBean.register()}" update="formPanel"/>
        </h:panelGrid>
    </h:form>
</p:panel>

RegisterBean.java

public String register()
{
    System.out.println("register");
    String accountValidateResult = accountService.validate(account);
    String studentValidateResult = studentService.validate(student);
    System.out.println("Validation Result: " + accountValidateResult);
    if (!studentValidateResult.isEmpty())
    {
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "Error", studentValidateResult + " has been taken"));
        focusProperty = studentValidateResult.toLowerCase();
        return null;
    }
    if (!accountValidateResult.isEmpty())
    {
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "Error", accountValidateResult + " has been taken"));
        focusProperty = accountValidateResult.toLowerCase();
        return null;
    }
    profile = profileService.insert(profile);
    account.setProfileId(profile.getId());
    student.setProfileId(profile.getId());
    accountService.insert(account);
    studentService.insert(student);

    FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Registration Successful", "Please login to you account"));
    FacesContext.getCurrentInstance().getExternalContext().getFlash().setKeepMessages(true);
    return "index?faces-redirect=true";
}