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如何为datatable列创建复合组件？

本文介绍了如何为datatable列创建复合组件？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

给定这个datatable（自然工作）：

 < rich：dataTable var =varvalue =＃{值}> 
< rich：column> 
< f：facet name =header> 
 HEADER 
< / f：facet> 
< h：outputText value =＃{var}/> 
< / rich：column> 
< / rich：dataTable>

如果我定义一个自定义组件（也可以在语法和正确的地方在资源/组件）：

 <？xml version =1.0encoding =UTF-8？> 
< html xmlns =http://www.w3.org/1999/xhtml
 xmlns：ui =http://java.sun.com/jsf/facelets
 xmlns：f =http://java.sun.com/jsf/core
 xmlns：h =http://java.sun.com/jsf/html
 xmlns：a4j =http://richfaces.org/a4j
 xmlns：rich =http://richfaces.org/rich
 xmlns：composite =http://java.sun.com/ jsf / composite> 
 
<！ -  INTERFACE  - > 
< composite：interface> 
< composite：attribute name =val/> 
< / composite：interface> 
 
<！ - 实现 - > 
< composite：implementation> 
< rich：column> 
< f：facet name =header> 
 HEADER 
< / f：facet> 
< h：outputText value =＃{cc.attrs.val}/> 
< / rich：column> 
< / composite：implementation> 
< / html>

为什么以下内容不起作用？

 <？xml version =1.0encoding =UTF-8？> 
< ui：composition template =/ WEB-INF / templates / default.xhtml
 xmlns =http://www.w3.org/1999/xhtml
 xmlns： ui =http://java.sun.com/jsf/facelets
 xmlns：f =http://java.sun.com/jsf/core
 xmlns：h =http ：//java.sun.com/jsf/html
 xmlns：a4j =http://richfaces.org/a4j
 xmlns：rich =http://richfaces.org/rich 
 xmlns：my =http://java.sun.com/jsf/composite/components> 
< ui：define name =content> 
< rich：dataTable var =varvalue =＃{values}> 
< my：mycolumn val =＃{var}/> 
< / rich：dataTable> 
< / ui：define> 
< / ui：composition>

你知道我该如何让它工作（我想定义我自己的列并保存代码） ？非常感谢！再见

解决方案

这不行。 < my：mycolumn> 真的需要是一个 UIColumn 的实例，因为只有有效的孩子 UIData 组件在渲染响应阶段。所有其他 UIComponent 类型将被忽略。一个复合组件隐含地是一个 UINamingContaner 组件，而不会按照你的意图工作。



我有自己为PrimeFaces < p：dataTable> 曾尝试使用扩展 UIColumn 的支持组件，但也只是由于复合组件的生命周期错误，将无法正常工作。列必须在视图构建时创建，而复合组件的正文在视图渲染时间内创建。



相反，创建一个标记文件。它只花费一个额外的 .taglib.xml 文件，但它完美无缺。



/WEB-INF/tags/column.xhtml ：

 < ui：composition 
 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：rich =http：/ /richfaces.org/rich
> 
< rich：column> 
< f：facet name =header> HEADER< / f：facet> 
< h：outputText value =＃{val}/> 
< / rich：column> 
< / ui：composition>

/WEB-INF/my.taglib.xml ：

 <？xml version =1.0encoding =UTF-8？> 
< facelet-taglib 
 xmlns =http://java.sun.com/xml/ns/javaee
 xmlns：xsi =http://www.w3.org / 2001 / XMLSchema-instance
 xsi：schemaLocation =http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facelettaglibrary_2_0 .xsd
 version =2.0
> 
< namespace> http：//example.com/my< / namespace> 
< tag> 
< tag-name>列< / tag-name> 
< source> tags / column.xhtml< / source> 
< attribute> 
< description>列值< / description> 
< name> val< / name> 
< / attribute> 
< / tag> 
< / facelet-taglib>

（< attribute> 条目不是强制性的，它只是纪录目的（生成的文档和IDE自动完成）。



/ WEB-INF / web.xml ：

 < context-param> 
< param-name> javax.faces.FACELETS_LIBRARIES< / param-name> 
< param-value> /WEB-INF/my.taglib.xml< / param-value> 
< / context-param>

用法：

 code>< ui：composition 
 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：rich =http://richfaces.org/rich
 xmlns：my =http://example.com/my
> 
< rich：dataTable value =＃{values}var =value> 
< my：column val =＃{value}/> 
< / rich：dataTable> 
< / ui：composition>


Given this datatable (naturally working):

<rich:dataTable var="var" value="#{values}">
<rich:column>
  <f:facet name="header">
   HEADER
  </f:facet>
  <h:outputText value="#{var}" />
</rich:column>
</rich:dataTable>

If I define a custom component (also ok in the syntax and at the right place under resources/components):

   <?xml version="1.0" encoding="UTF-8"?>
    <html xmlns="http://www.w3.org/1999/xhtml"
        xmlns:ui="http://java.sun.com/jsf/facelets"
        xmlns:f="http://java.sun.com/jsf/core"
        xmlns:h="http://java.sun.com/jsf/html"
        xmlns:a4j="http://richfaces.org/a4j"
        xmlns:rich="http://richfaces.org/rich"
        xmlns:composite="http://java.sun.com/jsf/composite">

    <!-- INTERFACE -->
    <composite:interface>
        <composite:attribute name="val" />
    </composite:interface>

    <!-- IMPLEMENTATION -->
    <composite:implementation>
        <rich:column>
            <f:facet name="header">
       HEADER
       </f:facet>
       <h:outputText value="#{cc.attrs.val}" />
       </rich:column>
    </composite:implementation>
    </html>

Why does the following does not work?

<?xml version="1.0" encoding="UTF-8"?>
<ui:composition template="/WEB-INF/templates/default.xhtml"
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:a4j="http://richfaces.org/a4j"
    xmlns:rich="http://richfaces.org/rich"
    xmlns:my="http://java.sun.com/jsf/composite/components">
    <ui:define name="content">
        <rich:dataTable var="var" value="#{values}">
                 <my:mycolumn val="#{var}"/>
                </rich:dataTable>
    </ui:define>
</ui:composition>

Do you know how could I let it work (I want to define my own column and save code)? Thanks a lot! Bye

解决方案

This won't work. The <my:mycolumn> really needs to be an instance of UIColumn as that's the only valid child of UIData component during render response phase. All other UIComponent types will be plain ignored. A composite component is implicitly an UINamingContaner component and that just won't work the way you intend.

I have myself for the PrimeFaces <p:dataTable> ever experimented with a backing component which extends UIColumn, but that also just won't work due to the wrong lifecycle of a composite component. The column has to be created during the view build time, while the composite component's body get created during view render time.

Rather create a tag file instead. It only costs only one extra .taglib.xml file, but it works flawlessly.

/WEB-INF/tags/column.xhtml:

<ui:composition
    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:rich="http://richfaces.org/rich"
>
    <rich:column>
        <f:facet name="header">HEADER</f:facet>
        <h:outputText value="#{val}" />
    </rich:column>
</ui:composition>

/WEB-INF/my.taglib.xml:

<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facelettaglibrary_2_0.xsd"
    version="2.0"
>
    <namespace>http://example.com/my</namespace>
    <tag>
        <tag-name>column</tag-name>
        <source>tags/column.xhtml</source>
        <attribute>
            <description>Column value</description>
            <name>val</name>
        </attribute>
    </tag>
</facelet-taglib>

(the <attribute> entries are not mandatory, it's just nice for documentary purposes (generated docs and IDE autocomplete))

/WEB-INF/web.xml:

<context-param>
    <param-name>javax.faces.FACELETS_LIBRARIES</param-name>
    <param-value>/WEB-INF/my.taglib.xml</param-value>
</context-param>

Usage:

<ui:composition
    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:rich="http://richfaces.org/rich"
    xmlns:my="http://example.com/my"
>
    <rich:dataTable value="#{values}" var="value">
        <my:column val="#{value}" />
    </rich:dataTable>
</ui:composition>

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08-31 00:51
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