在JSF 2复合组件中是否存在继承这样的东西？ [英] Is there such a thing as inheritance in JSF 2 composite components?
问题描述
JSF 2复合组件中是否有继承这样的东西？
Is there such a thing as inheritance in JSF 2 composite components?
据我所知，没有。
我只是确定。
As far as I know, there isn't. I'm just making sure.
谢谢！
推荐答案
复合组件的继承是不可能的。我们为避免代码重复而做的是装饰JSF2复合组件的实现。
Inheritance of composite components is not possible afaik. What we did to avoid code duplication is to decorate the implementation of a JSF2 composite component.
我们的应用程序的所有输入字段共享的东西都在装饰器模板中提供，如这个：
The stuff shared by all input fields of our application is provided within a decorator template like this:
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:cc="http://java.sun.com/jsf/composite"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:cu="http://mytags.de/jsftags">
<!-- provides a common set of layout information for inputfields -->
<ui:param name ="fieldStyle" value="#{propertiesController.get('FIELD_STYLE', cc.attrs.name)}" />
<h:panelGroup id="basicInputField" styleClass="basicInputField" layout="block" style="width: #{cc.attrs.width}; height: #{cc.attrs.height};">
<ui:insert name="component">
no component given...
</ui:insert>
</h:panelGroup>
</ui:composition>
复合组件使用模板来装饰自己：
And the composite component uses the template to decorate itself:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:cc="http://java.sun.com/jsf/composite"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:cu="http://mytags.de/jsftags">
<cc:interface>
<cc:attribute name="name" required="true" />
<cc:attribute name="width" required="false" default="auto" />
<cc:attribute name="height" required="false" default="auto" />
<cc:attribute name="inset" required="false" default="0px" />
</cc:interface>
<cc:implementation>
<ui:decorate template="basicInputField.xhtml">
<ui:define name="component">
<h:inputText id="inputText" style="#{fieldStyle} width: 100%;" value="#{levelContent.test}" />
</ui:define>
</ui:decorate>
</cc:implementation>
</html>
这样我们只需要更改装饰器模板，当我们获取字段属性的方式时（即只读） ，必需，风格，......）变化。
This way we only need to change the decorator template, when the way we fetch field properties (i.e. readonly, required, style,...) changes.
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