Question

我完全不习惯使用<f:viewParam>和<f:viewAction>。

我已经阅读了几个类似this的类似问题，但却无法使其发挥作用。

简单示例如下：

test.xhtml

<h:head>
    <title>Test</title>
</h:head>
<h:body>

    <f:view>
        <f:viewParam name="reason" value="#{testBean.reason}"/>
        <f:viewAction action="#{testBean.examineReason}"/>
    </f:view>

    <h:outputText value="Reason=#{testBean.reason}"/>
</h:body>

testBean这个

import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@RequestScoped
public class TestBean {

    private String reason;

    @PostConstruct
    private void init() {
        System.out.println("urlParameter: "
                        + FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("reason"));

    }

    public void examineReason() {
        System.out.println("Reason is " + reason);
    }

    public String getReason() {
        return reason;
    }

    public void setReason(String reason) {
        this.reason = reason;
        System.out.println("Reason set: " + reason);
    }

}

GET-Request由以下人员发起：

<h:button outcome="/pages/test.jsf" value="GET">
    <f:param name="reason" value="abcd" />
</h:button>

仅限System.out报告：

urlParameter: abcd

似乎f：viewParam和f：viewAction都不起作用。

我在Tomcat 8.0.32上使用Mojarra 2.2和MyFaces 2.2进行了测试

我错过了什么？

修改

问题解决了：<f:metadata> - 标签丢失了。此外，<f:metadata>不得为<h:body>的孩子。通过test.xhtml中的以下修改，它对我有用：

<h:head>
    <title>Test</title>
</h:head>
<body>

    <f:view>
        <f:metadata>
        <f:viewParam name="reason" value="#{testBean.reason}"/>
        <f:viewAction action="#{testBean.examineReason}"/>
        </f:metadata>
    </f:view>

    <h:outputText value="Reason=#{testBean.reason}"/>
</body>

JSF：f：viewParam不调用setter，f：viewAction不调用business-method

0 个答案: