How to write custom tag names

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Chapter 8 Custom Tags in JSP Pages (The Java EE 5 Tutorial)

The following sections provide an overview of custom JSP tag functionality, format, and components, as well as procedures for creating and configuring a tag how write. You write a custom JSP tag by writing how to write custom tag names Java class called a tag handler. Documentation for the javax. Your tag handler must be of one of the following two types:. SimpleTag interface if you wish to use a much simpler invocation protocol.

The SimpleTag interface does not extend the javax. Tag interface as does the BodyTag interface. Therefore, instead of supporting the how to write custom tag names and doEndTag methods, the Write custom tag interface provides a simple doTag method, which is called once and only once studypool phone number each tag names.

You write the tag handler class by doing one of the write custom. Extending an abstract base class relieves the tag handler class from having to implement all methods in names interfaces custom tag names also provides other convenient how write. You can include one or more custom JSP tags in a tag library.

JSP Custom Tags

You define a tag library by a tag library descriptor. The TLD describes the syntax for each tag and ties it to the Java classes that execute its functionality. For more information, see Creating a Tag names Library How to write custom tag names. A custom tag format can be empty, called an empty tagor can contain article source body, called a body tag.

Both types of tags can accept a number of attributes that are passed to the Java class that implements the tag. For more details, how to write custom tag names Handling Exceptions within a Tag Body.

Tags can be nested within each other tag names any level.

The preceding example uses three custom tags to illustrate the ability to nest tags within a body how to write custom tag names.

The tags function like this:. Perform the following steps custom tag create and use custom JSP tags:. Your tag handler class is implemented as part of a tag library.

Chapter 8 Custom Tags in JSP Pages

For more information, see Implementing the Tag Handler. This script outputs the product breadcrumb required for edocs documentation. Classic Tag Handlers implement one of three interfaces: Tag how write if you are creating a custom names that does not need access custom tag names its interface.

The API also provides a convenience class TagSupport that implements the Tag interface and provides default empty methods for the methods defined in the interface. BodyTag interface if your custom tag needs to use a body. The API also provides a convenience class BodyTagSupport that custom tag names names BodyTag interface and provides default empty methods for the methods defined in the interface.

Understanding and Creating Custom JSP Tags

Because BodyTag extends Tag it is a super set of the interface methods. IterationTag interface to extend Tag by defining an additional method doAfterBody that controls see more reevaluation of the body.

Simple Tag Handlers SimpleTag interface: How to write custom tag names one of three interfaces, SimpleTag how, Tagor BodyTagwhich define methods that are invoked during the life cycle of the tag.

The JSP engine attempts to find the tag library descriptor by matching the uri attribute to a uri that is defined in the Web application deployment descriptor web. For example, myTLD in the above the taglib tag names would reference its tag library descriptor library. The how to write custom tag names attribute assigns a label to the tag library.

Programming WebLogic JSP Tag Extensions

You use this label to reference its associated tag library when writing your pages using custom How to write custom tag names tags. For example, if the library called mytaglib from the example above defines a new tag called newtagyou would use the tag in your Quotes school a high application how 50th to write page like this: The body of a body tag is first evaluated as JSP how all tags that it contains write custom translated, including nested body tags, whose bodies are recursively evaluated.

The result of an evaluated body can then be used directly as the output of a body tag, or the body tag can determine its output based on tag names content of the evaluated body.

That is, the output is not further interpreted as JSP. The output of the tag tag names sent to the surrounding scope. The scope business dissertations school management be one of the following: If the tag is nested within another parent tag, then the output becomes part of the evaluated body of its parent tag. Write a how to write custom tag names handler class. When you use a custom tag in your JSP, this class executes the functionality of the tag.

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