#THE PRICE IS RIGHT NAME TAGS TEMPLATE CODE#
The source code for the Duke’s Bookstore application is located Tut-install/javaeetutorial5/examples/web/bookstore3/src/java/com/sun/bookstore3/dispatcher/Dispatcher.java, a servlet, which processes requests and forwards to template.jsp.įigure 8–1 Request Flow through Duke’s Bookstore Components Have the same banner but different title and body content (specified by the Tut-install/javaeetutorial5/examples/web/bookstore3/web/template/screendefinitions.jspf, which defines the subcomponents used by each screen. It uses the insert tag to compose a screen from subcomponents. Tut-install/javaeetutorial5/examples/web/bookstore3/web/template/template.jsp, which determines the structure of each screen. Of a request through the following Duke’s Bookstore web components: Insert parameters from the table into the screen. The template is created using aĪnd parameter) that are used to build a table of screenĭefinitions for Duke’s Bookstore. Page for the custom content of the screen. For example, a simple template might include a title parameterįor the top of the generated screen and a body parameter to refer to a JSP That has placeholders for the parts that need to change with each screen.Įach of these placeholders is referred to as a parameter of Set of tags for creating an application template. The tutorial-template tag library defines a It illustrates the tasks using excerpts from the JSP version of the Duke’sīookstore application discussed in The Example JSP Pages, rewritten here to take advantage of several custom tags:Ī catalog tag for rendering the book catalogĪ shipDate tag for rendering the ship dateĪ template library for ensuring a common look and feel amongĪll screens and composing screens out of content chunks This chapter describes the tasks involved in defining simple tags. In one tag, and then use the bean in another tag.īe nested within one another and communicate by means of private You can create and initializeĪ JavaBeans component, create a public EL variable that refers to that bean They canīe customized by means of attributes passed from the callingĪccess all the objects available to JSP pages.Ĭommunicate with each other. The web container then invokes those operationsĬustom tags have a rich set of features. When a JSP pageĬontaining a custom tag is translated into a servlet, the tag is converted What Is a Custom Tag?Ī custom tag is a user-defined JSP language element. For more informationĪbout tag libraries and for pointers to some freely available libraries, see. This chapter assumes that you are familiar with the material in Chapter 5, JavaServer Pages Technology, especially The tag, JSP technology provides a simple API for developing a tag handler When the flexibility of the Java programming language is needed to define Take advantage of existing tag libraries, or by page authors who do not know Tag filesĬan be used to develop custom tags that are presentation-centric or that can
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That is translated into a simple tag handler by the web container. A tagįile is a source file containing a reusable fragment of JSP code Tag handlers using the JSP language or using the Java language. Simple tag handlersĪre covered in this chapter, and classic tag handlers are discussed in Chapter 9, Scripting in JSP Pages. Handlers must be used if scripting elements are required. Simple tag handlers can be used only for tags that do not use scriptingĮlements in attribute values or the tag body. JSP technology defines two types of tag handlers: simple and classic. Object that implements a custom tag is called a tag handler. Related custom tags and contains the objects that implement the tags. Custom tags increase productivity because they can be reusedĭistributed in a tag library, which defines a set of Tags include operating on implicit objects, processing forms, accessing databasesĪnd other enterprise services such as email and directories, and implementingįlow control. Some examples of tasks that can be performed by custom JSP technology also provides a mechanism for encapsulating other types ofĭynamic functionality in custom tags, which are extensions The standard JSP tags simplify JSP page development and maintenance.