Oracle Tips by Burleson

Branching

A Branch is the logic control used to navigate to other application pages, either in the current application or another application or navigate to another URL such as www.rampant-books.com.  When creating branches, properties are set to define when and how the branch behaves.  The following are some of the properties.

• Branch Point

• Branch Type

•  Branch Target

• Conditions

Branching Points

•  On Submit: Before Computation (Before Computation, Validation, and Processing):  A Before Computation branch will branch to another page without processing other logic controls on the page.  Using a Before Computation branch is a handy way to provide a button that simply navigates to another page without performing any processing.

• On Submit: Before Validation: (After Computation and Before Validation and Processing):  This branch point will execute after computations have taken place.  A common use for this branch is to allow the computations to set the session state for page items on another page and then use that branch point to branch to the page.

•  On Submit: Before Processing: (After Computation, Validation and Before Processing):  This branch point will execute after computations and validations.  Often this branch point is used for a Cancel, Back, or Previous button.  HTML DB often uses this branch point in wizards for the Back and Previous buttons.

• On Submit: After Processing: (After Computation, Validation, and Processing):  This is the kind of branch point introduced in previous chapters and is the most common branch point used in HTML DB.  It will be executed after all other page processing logic has been executed.

• On Load: Before Header:  This branch point is actually executed prior to page rendering.  A good use for this is to interrupt the rest of the page processing and branch to another application page or URL, and it is most commonly used with a condition.  The condition being such that it would not be desirable to render the current page if the condition were TRUE.

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