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  Oracle Tips by Burleson

Before Header Computations

Before Header computations are the first pieces of logic to be executed by the HTML DB engine.  A Before Header computation can set the values of any page item regardless of its position on the page or which region it is in.  It can also reference a page item set by another before header computation that has a lower execution sequence. 

As shown in Figure 12.6, the P2300_AFTER_HEADER computation would be able to use the value set in P2300_REGION_1, but P2300_REGION_1 would not be able to reference the value set in P2300_AFTER_HEADER.  That is because P2300_AFTER_REGION has a higher sequence (20) and is executed after the other computation (10).

Before Header Processes

Not only is this execution point performed first, but it is also executed before any HTML is rendered.  Reviewing the HTML code below shows that a Before Header process writes HTML code before the HTML engine renders the <html> tag.  See the example below.  A common use for the before header process is to populate page items on the application page.

BeforeHeader Process Point
<html lang="en-us" xmlns:htmldb="http://htmldb.oracle.com">
<head>

The text BeforeHeader Process Point at the top of Figure 12.8 was written using this type of process.


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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