Implementors of JSTL and authors of JSP pages may find the The JavaServer Pages™ Standard Tag Library (JSTL) specification is the result. The JavaServer Pages Standard Tag Library (JSTL) is a component of the Java EE Web application development platform. It extends the JSP specification by. Apache hosts the Apache Standard Taglib, an implementation of the JSP Standard Tag Library (JSTL) specification. Various versions are.
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General-purpose actions that are used to manipulate the scoped variables that might be found within a JSP.
JSR A Standard Tag Library for JavaServer Pages(TM) Specification Maintenance Release 2
Isn’t that business logic that belongs in the model? The Core area comprises four distinct functional sections: All of these xScope objects are Maps that map the respective scope attribute names to their values. The set of tags that are available in the Core tag library come into play for probably most anything you will be doing in your JSPs. To address both of these functional areas, let’s first take a cursory look at what pieces are involved in creating international applications.
These actions come under the functionality of the I18N umbrella.
The answer is yes. Using separate TLDs to expose the tags, the functionality for each set of actions is apparent and makes more sense. What it means to use EL in attributes can be shown in the following example: Using paramValues is particularly useful if you have a form with check boxes or for some other reason a parameter might have multiple values like a multiselect box. While the JSTL specicication commonly referred to as a single tag jwtl, it is actually composed of four separate tag libraries: The community has asked for it, the community has gotten it.
These tag libraries provide a wide range of custom action functionality that most JSP authors have found themselves in need of in the past. To ensure that the data is displayed to the user correctly we would use: It should be obvious that: Using the JSTL will not only make your JSPs more readable and maintainable, but will allow you to concentrate on good design and implementation practices in your pages. Let’s look at each functional section in the Core tag library a bit more closely.
For a complete discussion on Struts along with a sample application, refer to The Struts Framework: If the book is not in stock, we can access the book Object by using the EL and assigning that to the value attribute. All of the standard and common operators are available. A more graceful handling of an error is shown in Example 3. Using separate TLDs also allows each library to have its own namespace.
You can reach her at sspielman at switchbacksoftware. With escapeXml defaulting to true:. Let’s walk through code samples to see how we use each of the tags provided in this library.
We will talk about this dpecification more detail later in this chapter, but as a quick example, so that you are familiar with the format, the action might look like: Working with the Internationalization and Formatting Actions More than likely, the application you are developing today will have to be internationalized tomorrow.
JavaServer Pages Standard Tag Library
The page author is the person who builds the JSP pages. The param and header objects are Maps that map the parameter or header name to a String. It defaults to true.
Well okay, that might be too optimistic to hope for since anyone who has developed applications for international use knows there is always something that needs to be tweaked. Functionality is included in the EL for relational, arithmetic, and logical operators. The following sections are excerpted from various specifixation within the JSTL: Expressions in template text are not supported if you are using JSTL 1.
The XML entity values that are used for encoding the characters are shown in Table 4.