【发布时间】：2011-12-14 05:34:42
【问题描述】：
我正在学习在 JSF 2.0 中使用复合组件。
首先我在下面创建了这个组件。 它声明了一个managedBean，并直接调用了managedBean的方法。
<h:commandButton
action = "#{cc.attrs.managedBean.toogleEditing}"
value = "#{cc.attrs.managedBean.editing?'Back':'Edit'}"
update = "componentes"/>
这是组件的完整代码：
<ui:component
xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.prime.com.tr/ui"
xmlns:composite="http://java.sun.com/jsf/composite">
<composite:interface>
<composite:attribute
name ="managedBean"
type = "java.lang.Object"
required ="true">
</composite:attribute>
</composite:interface>
<composite:implementation>
<f:view contentType="text/html">
<h:form id="componentes">
<h:panelGrid columns="3">
<h:panelGroup>
<h:outputText
escape = "false"
value = "#{cc.attrs.managedBean['value']}"
rendered = "#{!cc.attrs.managedBean['editing']}"/>
<p:editor
widgetVar = "editor"
value = "#{cc.attrs.managedBean.value}"
rendered = "#{cc.attrs.managedBean.editing}"/>
</h:panelGroup>
<h:commandButton
action = "#{cc.attrs.managedBean.toogleEditing}"
value = "#{cc.attrs.managedBean.editing?'Back':'Edit'}"
update = "componentes"/>
<p:commandButton
action = "#{cc.attrs.managedBean.toogleEditing}"
value = "#{cc.attrs.managedBean.editing?'Back':'Edit'}"
update = "componentes"/>
</h:panelGrid>
</h:form>
</f:view>
</composite:implementation>
</ui:component>
在第二个测试中，我创建了一个作为方法的属性。
<composite:attribute
name = "action"
method-signature = "void action()"
required = "true"/>
我使用属性调用方法，而不是上面从 managedBean 调用方法的其他版本。
<h:commandButton
action = "#{cc.attrs.action}"
value = "#{cc.attrs.managedBean.editing?'Back':'Edit'}"
update = "componentes"/>
This is the code of the second component:
<ui:component
xmlns = "http://www.w3.org/1999/xhtml"
xmlns:f = "http://java.sun.com/jsf/core"
xmlns:h = "http://java.sun.com/jsf/html"
xmlns:ui = "http://java.sun.com/jsf/facelets"
xmlns:p = "http://primefaces.prime.com.tr/ui"
xmlns:composite = "http://java.sun.com/jsf/composite">
<composite:interface>
<composite:attribute
name = "managedBean"
type = "java.lang.Object"
required = "true">
</composite:attribute>
<composite:attribute
name = "action"
method-signature = "void action()"
required = "true"/>
</composite:interface>
<composite:implementation>
<f:view contentType="text/html">
<h:form id="componentes">
<h:panelGrid columns="3">
<h:panelGroup>
<h:outputText
escape = "false"
value = "#{cc.attrs.managedBean['value']}"
rendered = "#{!cc.attrs.managedBean['editing']}"/>
<p:editor
widgetVar = "editor"
value = "#{cc.attrs.managedBean.value}"
rendered = "#{cc.attrs.managedBean.editing}"/>
</h:panelGroup>
<h:commandButton
action = "#{cc.attrs.action}"
value = "#{cc.attrs.managedBean.editing?'Back':'Edit'}"
update = "componentes"/>
<p:commandButton
action = "#{cc.attrs.action}"
value = "#{cc.attrs.managedBean.editing?'Back':'Edit'}"
update = "componentes"/>
</h:panelGrid>
</h:form>
</f:view>
</composite:implementation>
</ui:component>
这是我称之为两个组件的 xhtml 页面：
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html
xml:lang="pt"
lang="pt"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.prime.com.tr/ui"
xmlns:components="http://java.sun.com/jsf/composite/components">
<h:head id="head">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Editable HTML Text Sample</title>
</h:head>
<h:body id="body">
<f:view contentType="text/html">
<h:form>
<p:panel header="Editable HTML Text Sample">
<components:EditableHTMLText
managedBean = "#{editableHTMLText}"/>
</p:panel>
<p:panel header="Editable HTML Text Sample Direct Action">
<components:EditableHTMLTextPrimeFaces
managedBean = "#{editableHTMLText}"
action = "#{editableHTMLText.toogleEditing}"/>
</p:panel>
</h:form>
</f:view>
</h:body>
</html>
问题是，在这个 index.xhtml 中，如果我调用两个组件，第二个组件（具有在属性标记中声明的方法的那个）不起作用。 如果在 index.xhtml 我评论第一个组件。比第二个工作正常。 一定是某种冲突，但我不明白为什么。 有什么提示吗？
这是豆子：
import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean
@SessionScoped
public class EditableHTMLText implements Serializable{
/**
*
*/
private static final long serialVersionUID = 8439126615761864409L;
private String value = "Test<br>of<br>HTML<br>text<br><b>ITEM</b><br>";
private boolean editing = false;
public void toogleEditing(){
this.setEditing(!this.isEditing());
System.out.println("Editing State: " + this.editing);
}
public String getValue(){
return value;
}
public void setValue(String value){
this.value = value;
}
public boolean isEditing(){
return editing;
}
public void setEditing(boolean editing){
this.editing = editing;
}
}
【问题讨论】：