[英]Problem creating my own custom tags(JSF 2.0)
我正在學習創建自己的自定義標簽,但我遇到了一些麻煩,我無法讓這個簡單的應用程序使用我創建的標簽。 我認為我做的一切都很好,但我擔心我創建的新庫的路徑是錯誤的。 也許有人可以幫助我找到我的錯誤所在並了解其原因。 這是我到目前為止所做的:
1-我將標簽創建為 xhtml 塊(mybutton.xhtml)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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">
<ui:composition>
<h:commandButton type="submit" value="#{buttonSubmitLabel}" />
<h:commandButton type="reset" value="#{buttonResetLabel}" />
</ui:composition>
</html>
2- 然后我創建了一個.xml 文件,它將充當我所有自定義標簽都被索引的庫(mytagsconfig.taglib.xml)
<?xml version="1.0"?>
<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://mytags.com/facelets</namespace>
<tag>
<tag-name>mybutton</tag-name>
<source>mytags/mybutton.xhtml</source>
</tag>
</facelet-taglib>
3-我試圖在 web.xml 中注冊我的新庫,所以我可以使用它
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>CHAPTER 5 Creating your own Custom tags</display-name>
<welcome-file-list>
<welcome-file>index.xhtml</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
<!-- REGISTERING A CUSTOM TAG INTO JSF APPLICATION -->
<context-param>
<param-name>javax.faces.FACELETS_LIBRARIES</param-name>
<param-value>/WEB-INF/mytagsconfig.taglib.xml</param-value>
</context-param>
</web-app>
4-最后我嘗試在某個頁面中使用標簽(在我的情況下,在插入模板的組件中)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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:mytags="http://mytags.com/facelets">
<ui:composition template="WEB-INF/templates/masterLayout.xhtml">
<ui:define name="pagetitle">
Defining custom tags
</ui:define>
<ui:define name="content">
Defining custom tags is a 3 step process:
<ul>
<li>Use ui:compisition to create some content.(Custom tags are stored in WEB-INF/customtags)</li>
<li>Declares the custom tag in a tag library descriptor into the WEB-INF folder(Example: mycustomtags.taglib.xml).</li>
<li>Register the tag library descriptor in the web.xml.</li>
</ul>
<!-- Here should go a call to the new created tag -->
<mytags:mybutton buttonSubmitLabel="Submit" buttonResetLabel="Reset" />
</ui:define>
</ui:composition>
</html>
這是我的文件夾結構:
****更新**** 當我構建時,我看到 index.xhtml 頁面,但自定義標簽不存在(我沒有看到 2 個按鈕)
您在web.xml
中的 taglib 聲明沒有指向正確的文件名。
You said that you've created a /WEB-INF/mytagsconfig.taglib.xml
, but you've declared it in web.xml
as /WEB-INF/mytags.taglib.xml
instead. 相應地修復它。
與問題沒有直接關系,但考慮升級到與 JSF/Facelets 2.0 兼容的 taglib 根聲明和web.xml
上下文參數名稱。
<?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">
<!-- Taglib config here. -->
</facelet-taglib>
和
<context-param>
<param-name>javax.faces.FACELETS_LIBRARIES</param-name>
<param-value>/WEB-INF/mytagsconfig.taglib.xml</param-value>
</context-param>
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