将操作方法添加到复合组件

Question

I am learning about composite components with JSF 2.0 and i want my component to be able to trigger methods from backing beans, so i created a simple example, but something is wrong. 我正在学习使用JSF 2.0的复合组件，我希望我的组件能够从支持bean中触发方法，所以我创建了一个简单的例子，但是出了点问题。

This is the component i created: 这是我创建的组件：

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
xmlns:composite="http://java.sun.com/jsf/composite">

<composite:interface>
        <composite:attribute name="attribute1"/>
        <composite:attribute name="attribute2"/>
        <composite:attribute name="actionBtnText"/>
        <composite:attribute name="actionMethod" method-signature="java.lang.String action()"/>
</composite:interface>

<composite:implementation>
    <h:form>
            <h:inputText value="#{cc.attrs.attribute1}"/>
            <br/>
            <h:inputText value="#{cc.attrs.attribute2}"/>
            <br/>
            <h:commandButton action="#{cc.attrs.actionMethod}" value="#{cc.attrs.actionBtnText}"/>          
    </h:form>

</composite:implementation> 

</html>

This is how i use it in a JSF page 这是我在JSF页面中使用它的方式

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:custom="http://java.sun.com/jsf/composite/custom">

...

    <h:body>
    <custom:demoCustomComponent attribute1="#{demoBB.value1 }" attribute2="#{demoBB.value2 }" actionBtnText="Button text!" actionBtn="#{demoBB.act}"/>
    </h:body>

And this is the backing bean that gives support to the page where the component is 这是支持组件所在页面的支持bean

@Named("demoBB")
@RequestScoped
public class DemoBB {

    private String value1;
    private String value2;
    public String getValue1() {
        return value1;
    }

    public String act() {
        System.out.println("Input 1: " + value1 + "\nInput 2: " + value2);
        return null;
    }

    //Getters and setters
    public void setValue1(String value1) {
        this.value1 = value1;
    }
    public String getValue2() {
        return value2;
    }
    public void setValue2(String value2) {
        this.value2 = value2;
    }   
}

The component seems to render fine, but when i press the button i get an exception that says: 该组件似乎渲染得很好，但当我按下按钮时，我得到一个异常，说：

javax.faces.FacesException: Unable to resolve composite component from using page using EL expression '#{cc.attrs.actionMethod}' javax.faces.FacesException：无法使用EL表达式'＃{cc.attrs.actionMethod}'来解析使用页面的复合组件

Did i make any mistake in the interface or implementation of the component? 我是否在组件的界面或实现中犯了错误？ Why doesn't work? 为什么不起作用？

Answer 1

You definied the action method using attribute name actionBtn : 您使用属性名称actionBtn定义了操作方法：

<custom:demoCustomComponent ... actionBtn="#{demoBB.act}"/>

but you're expecting it to be the attribute name actionMethod : 但是你期望它是属性名称actionMethod ：

<composite:attribute name="actionMethod" method-signature="java.lang.String action()"/>

Align it. 对齐它。 They should be the same. 它们应该是一样的。

将操作方法添加到复合组件

问题描述

1 个解决方案

解决方案1
11 已采纳 2011-10-18 12:36:29

将操作方法​​添加到复合组件

问题描述

1 个解决方案

解决方案1 11 已采纳 2011-10-18 12:36:29

将操作方法添加到复合组件

解决方案1
11 已采纳 2011-10-18 12:36:29