JSF 中的自定义 Facelet 组件 [英] Custom Facelet component in JSF
问题描述
是否可以创建自定义的 JSF 核心 Facelet 组件.类似于
Is it possible to create a custom JSF core Facelet component. Something like <custom:composition> of <ui:composition>, or <custom:include> for <ui:include>
It would be helpful if someone can tell me the steps involved.
提前致谢，
考沙尔
推荐答案
本质上是标记处理程序.IE.从 TagHandler 扩展的类.
It are in essence taghandlers. I.e. classes extending from TagHandler.
这是一个 Hello World 标记处理程序.
Here's a Hello World taghandler.
com.example.HelloTagHandler
public class HelloTagHandler extends TagHandler {
public HelloTagHandler(TagConfig config) {
super(config);
}
@Override
public void apply(FaceletContext context, UIComponent parent) throws IOException {
// Do your job here. This example dynamically adds another component to the parent.
if (ComponentHandler.isNew(parent)) {
UIOutput child = new HtmlOutputText();
child.setValue("Hello World");
parent.getChildren().add(child);
}
nextHandler.apply(context, parent); // Delegate job further to first next tag in tree hierarchy.
}
}
/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>hello</tag-name>
<handler-class>com.example.HelloTagHandler</handler-class>
</tag>
</facelet-taglib>
/WEB-INF/web.xml(注意:当my.taglib.xml在/META-INF中时，这部分不是必须的/WEB-INF/lib 中 JAR 文件的 code> 文件夹，就像 JSF 组件库一样):
/WEB-INF/web.xml (note: this part is not mandatory when my.taglib.xml is in /META-INF folder of a JAR file inside /WEB-INF/lib like as with JSF component libraries):
<context-param>
<param-name>javax.faces.FACELETS_LIBRARIES</param-name>
<param-value>/WEB-INF/my.taglib.xml</param-value>
</context-param>
在/some.xhtml
<html ... xmlns:my="http://example.com/my">
...
<my:hello />
To see the source code of Mojarra implementation of <ui:composition> and <ui:include>, click the links.
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