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Page Processing

Although this chapter is titled Page Processing, information regarding the logic controls included in the Page Processing alone is not enough, coverage of their use during Page Rendering is also necessary.  There are also application level logic controls which execute when HTML DB sessions are created during login. 

Using Page Rendering and Page Processing effectively can be somewhat confusing when learning to develop applications using HTML DB.  When I first saw the Page Processing region, I was confused and did not know how to use it.  After all, I’ve been used to having to write every line of code in other programming languages. 

The fact is, Page Processing in HTML DB is a clever method of providing logic control to developers of web pages who do not have a programming background.  The tricky part is understanding what is happening, why it is happening, and when it is happening.   This chapter will help answer those questions.

The Page Processing region is shown in Figure 12.1.  This example is taken from application page 29 of the Sample Application included with HTML DB.

The Page Processing region contains the logic that is to be executed when the page is submitted.  The items in the Page Processing region are called Logic Controls.  When the page is submitted, the HTML DB engine considers each of the logic controls in a specific order determined by the developer.  The Conditions set on each of the logic controls is the deciding factor on whether they will be executed.  It is just like a big IF … THEN statement for all the logic controls.

There is an exception to this rule.  If one of the processes or branches navigates off the page before the logic control is considered by the HTML DB engine, it will be ignored.  This navigation is usually performed in a Before Computation, Before Validation, or Before Processing branch.  Branches will be covered later in the chapter.


The above book excerpt is from:

Easy HTML-DB Oracle Application Express

Create Dynamic Web Pages with OAE

ISBN 0-9761573-1-4   

Michael Cunningham & Kent Crotty

http://www.rampant-books.com/book_2005_2_html_db.htm  



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