The Common-Controls Tag Library


Generates a headline element.

Tag class: HeadlineTag

[ Syntax ]

Standard Syntax
[ action = "String" ]
[ caption = "String" ]
[ detail = "String" ]
[ filter = "boolean" ]
[ id = "String" ]
[ locale = "String" ]
[ name = "String" ]
[ permission = "ACL" ]
[ property = "String" ]
[ scope = "{any | page | request | session | application}" ]
[ width = "String" ]

[ Attributes ]

actionString Specifies the Struts Action that is to be called in case of control element events.

This attribute need not be specified if the tag is included within a Struts <html:form> tag. In that case, the name of the action is determined using the Struts Form Bean.

Annotation: The action must be declared in one of the struts-config.xml files.

captionString The main headline.  
detailString The detail headline.  
filterboolean This flag specifies whether an HTML-conversion of the caption and detail parameters should be carried out.  
idString The name of a page scope JSP bean that will contain the current element. Using the given Id, the variable can be accessed in scripting expressions in the tag Body. The id mus be a string lteral because the JSP compiler generates a variable withthis name at compile time

Annotation: A valid Java identifier must be given.

localeString enables localization for the control element. String literals will be interpreted as keys in the file.

Annotation: boolean value true oder false oder the name of a locale.

nameString Specifies the name of the Java-Bean. The Java-Bean must be stored in the given scope.

When the tag is surrounded by a Struts <html:form> tag, no Bean Name need be specified. In this case, the Java-Bean is drawn via a property of the Struts Form Bean.

Annotation: A valid Java identifier must be given.

permissionACL With this attribute, access to the element can be restricted.

Authorizations are checked using the object in the user session. The principal object is registered in the session with the method, Principal). It is made available by the application developer by implementing the principal interface. In this manner, any authorization system can be very easily connected within the framework.

Authorizations are always specified in the form of an Access Control List (ACL). What is involved here is a semicolon-delimited list with individual authorizations. The framweork supports the following authorization types, which, however, can be expanded at will by the application developer:

true|false ->
#rolename ->
$functionname ->

propertyString Specifies the name of the property using which the Java-Bean is to be accessed. This is generally only necessary when the Java-Bean is associated with a Struts Form Bean.

Annotation: A valid Java identifier must be given.

scopeHTTPScope This attribute shows the Scope in which the Java-Bean with the actual display data can be found.
  • any = The Bean is searched for in ever Scope.
  • page = The Bean exists as a local variable in the JSP Page.
  • request = The Bean is in the HTTP-Request.
  • session = The Bean is in the HTTP-Session.
  • application = The Bean is in the Servletkontext.
widthString Sets the width of the control element. The height may be specified in absolute or percent terms.

See the HTML documentation


[ Example ]

Generates a simple headline element.

<%@ taglib uri=""    prefix="ctrl" %>

<ctrl:headline  caption="Person List"  detail="browse"/>