JSTL

This code fragment can be reduced back to a single line by moving the JSTL code into a reusable tag file that outputs the element.

The solution is to cache the code, possibly using JSTL to store the generated code within the JSP application scope as shown in Listing 5.

Of further benefit is the existence of the standard set of custom tag libraries defined within the JSTL.

When combined with the JSTL tags, however, it enables complex behavior to be represented using a simple and convenient notation.

When the var attribute is specified, no change is made to the JSP environment with respect to what time zone is used by any other JSTL tags.

The JSTL core library contains a variety of general-purpose custom tags that should be of use to a wide spectrum of JSP developers.

For now, the expression language is only available for specifying dynamic attribute values in JSTL custom tags.

JSTL EL provides considerable flexibility in writing your JSP code, and is a great addition to the core JSP language.

To understand the JSTL examples, then, only these two classes are important.

Download the compressed file shown above (the Standard JSTL library link), and save it somewhere on your hard drive.

These steps are mirrored in the JSTL tags used for manipulating XML.

If no such header is present, then JSTL provides a set of JSP configuration variables you can set to specify a default locale.

In addition to a rich set of tags, the JSTL defines its own expression language (EL).

First, JSTL is now defined in a separate specification from JSP tags.

The custom tags in the JSTL fmt library provide straightforward access to the Java platform's internationalization API for JSP developers.

JSTL expressions also have no special meaning inside an HTML tag's attribute.

So far in our tour of JSTL, we've examined the JSTL expression language (EL) and both the core and fmt tag libraries.

JSTL extends this capability by providing additional actions for assigning and removing objects within these scopes.

I've also provided a brief intro to the JSTL and outlined the benefits of using it rather than creating all your custom tags from scratch.

This ensures that your JSTL tags will remain consistent, even as the JSP specification changes.

In the previous articles in this series, we discussed the JSTL and its expression language (EL).

While we ve learned about just one JSTL tag here, there are obviously quite a few more you should know about.

Display layers of data validation using JS, AJAX uses asynchronous submission display the data using JSTL tags.

Among other things, JSTL extends our capacity for working with scoped variables and implicit objects.

JSF tags support the JSTL expression language; JSP 2. 0 will fully support the JSTL expression language as well.

To demonstrate the JSTL tags, we ll use examples from a working application for the remaining articles in this series.

The first step in displaying such localized content with JSTL is to specify the resource bundle.

The next JSTL library we'll discuss is the fmt library.

The fourth and final set of JSTL actions is the sql custom tag library.

The two JSTL tag library validators allow developers to enforce coding standards within their JSP applications.

Several of the "commons" libraries from Apache are available, such as the JSTL expression language tools and collection libraries.

Defined initially as a main feature of JSTL, the expression language was later incorporated into the JSP 2. 0 standard.

Using JSTL over the core JSP tags offers several big advantages.

You can use the JSTL core out tag to display the parameters passed to JSPs in either the session or request objects.

JSTL provides tags for conditional and looping constructs.

This section shows how easily you can implement this with the help of JSTL and JSP tag files.

Next month, we'll start talking about JSP custom tags and the JSP Standard Tag Library (JSTL).

The first two lines include the taglib directives available to the JSP page, so that you can use the core and SQL JSTL tag libraries.

The JSTL out tag has just one required attribute, the value attribute.

You'll use JSTL mainly to eliminate the looping Java code from the home page.

The custom tags in the JSTL fmt library fall into four major groupings.

In the initial article of this series, you got your first look at JSTL.

This section demonstrates how to implement the same input component, using JSTL and JSP tag files.

The remaining tags in the JSTL core library focus on URLs.

Is the final authority on the EL and the four JSTL tag libraries .

Figure 2 shows sample page output corresponding to the JSTL code in Listing 7.

Project is home to the reference implementation for JSTL 1. 0.

As we discussed earlier , JSTL 1. 0 Includes four custom tag libraries .

They are based on corresponding tags from the JSTL core library.

You'll find out how to make your JSP pages a lot cleaner using some tags from the JSTL and the Spring Tag Library.

However, we are handling roles through JSTL, so we can define the constraint for all roles by adding the code in Listing 3.

Standard JSTL library -- The current release is 1. 1. 2.

Finally, you used the JSTL SQL tag library to issue queries against the Derby database you configured as a data source.

As the final row of the table indicates, JSTL defines its own interface,

The JSTL core library includes a second tag for managing scoped variables,

Any tag that supports JSTL expression language can now access the symbol variable using

The primary JSTL action for implementing iterative content is the

ideas used in struts evolved into jstl and jsf

To illustrate the interaction of JSTL tags with the expression language, we will look at several of the tags from the JSTL

The first JSTL custom tag we will consider is the

is a good starting point to learn more about jstl