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The heitml Libraries
heitml provides you with a number of Library Files that help you get your
work done. This page presents an overview of the purpose of each Library.
Subsequent pages in this section give more detailed information, along with
explanations and examples of all the Tags.
The heitml libraries are organized as follows:
- Basic Libraries
The Standard Layout Library helps you create Web Pages
that maintain a standard "look and feel" by employing
a template driven, modular approach to page design. Changes
to the Standard Layout are instantly reflected in every Web Page,
thus simplifying the maintenance of large Web Sites.
There are three Libraries dealing with session mode.
Most important is the Session Library, which provides session variables.
The Session Field Library displays and updates data entered into
forms. The Session Trace Library maintains a list of all pages
visited.
These libraries are called Basic Libraries because they provide
important basic services which are used by the Component Libraries
discussed in the following section. Though simple in concept, the
Standard Layout Library and the Session Libraries form the cornerstone
of heitml Web Pages, and you will no doubt come to depend on them
anytime you create a suite of pages that need to share data or
otherwise work in concert with one another. 
- Component Libraries address specific application
problems such as Database search and update, how to send
mail from within a page, adding counters to pages, and
creating heirarchical pages and menus in outline format.
Though heitml is a full-featured programming language,
Component Libraries make it possible to create complex
applications simply by specifying pre-developed Tags that
know how to handle the work you had in mind. Although it is
possible to use a few of the Component Libraries in stand-alone
fashion, most of them are designed to draw upon services provided
by the Basic Libraries described above. If your Web Page design
methodology centers around the simple concepts presented in the
Basic Libraries, you can be sure that the Component Libraries will
be ready to serve you when you need them.
- Helper Libraries provide low-level Tags for a wide
range of tasks such as string manipulation, mathematical
calculations, Date/Time operations, and other HTML-related
extensions. These Libraries can be used in stand-alone fashion, as
they do not depend on the services of any other Library.
Library Structure
The following figure graphically shows the libraries available. The basic
libraries at the bottom and the Component libraries built on them. On the
right hand side the helper libraries are shown independently from the other
libraries
Basic Libraries:
stdlay - Standard Layout The Standard
Layout Tags give your Web Site a consistent appearance. You can define
headers and footers, or complete page layouts that can be re-used over and
over again for all of your pages. Pages can be shown with adapted layout
within frames and pages caneven be included within other pages.
Session and SessionField libraries
handle User Sessions. They contain many useful Tags that help you keep
track of User input as he wanders about your Site or within your specialized
applications.
Component Libraries:
dba - Database Browsing and Modification Applications
The dba Component Library can be used to build database
browsing and modification applications simply by defining the appropiate form layouts.
dba applications employ special Tags that act as scrolling commands, allowing you to
browse backwards and forwards through a database. These Tags and others in
the dba Library perform consistency checks with various field formats, redisplay User
input, and take care of many common operations that would otherwise require much
programming on your part.
dbs - Relation Scroller With the dbs Component Library, the result of
SQL Queries can be displayed in scrollable fashion. The Scroller works best when used
in conjunction with Query Forms.
dbq - Database Query Forms The dbq Component Library interprets User input
to a form and generates SQL Queries automatically. No need for you or the visitors to your
Web Site to learn anyting about SQL. These heitml pre-developed Tags allow you to work
at a very high level, shielding you from the often trivial and mundane tasks that normally
take up so much time when developing Web Pages that work with information
stored in Databases.
mailform - Easily Creates Powerful Mailforms In addition to the
usual CGI mailforms, heitml mailforms can
produce emails from a User-defined text, send them to the intended recipients,
display a preview, and take care of many tasks normally associated with the
production of email-based newsletters, product announcemens, press releases,
etc. In short, heitml mailform Tags make it possible for your Secretary or
Marketing Manager to perform tasks that would otherwise have required the
talents of an experienced CGI programmer.
outline - Web Site Outline The Web Site Outline Library
structures your Web Site in an hierarchical manner. It produces Menus that
automatically expand and contract to display sub-Menu Items (as demonstrated here
on our very own heitml Web Site). It produces a Table of Contents for
your complete Web Site that can be printed on a single page. It also takes
care of all your links (next, previous, and up). With the Web Site Outline Library,
all you need do is define the structure of the Web Site in a single place. Everything
else works automatically.
Helper Libraries
Date/Time, Math, and String Libraries contain many useful functions.
All are designed to anticipate your needs and save you the time it would take
to develop similar tools of your own. With heitml, you'll find that you can
often design and develop complex Web Applications simply by using the pre-developed
Tags in these and other Libraries.
Flexibility
All Libraries and Components are written in heitml and are included in
Source Code.
If you don't see what you're looking for here, check our Registered Apps
Database. This is the place where you can find out what's
currently available from third party developers who have developed heitml
Applications, Libraries and Components of their own, either for sale as
Commercial Products, or as Shareware/Freeware.
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