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Oracle Tips by Burleson |
Page Events
View
The Page Events View is accessed by selecting the
Events option in the View select list as shown in Figure 6.6 and
pressing the Go button.
Page Events are an extremely valuable tool to the
HTML DB newcomer. It shows a detailed view of when each page
component is being rendered by the HTML DB engine. Figure 6.6 shows
page three of application 102, the Conference RSVP application being
displayed in the page events view. In order, the After Header
processes are executed, the Breadcrumb menu is rendered, and then the
Conference Attendee region and page items are rendered. Understanding
that one event must occur before another can save hours of
frustration. This is one of the tricky things to get the hang of when
learning HTML DB.
Page rendering events and page processing events
are explained in greater detail in a later chapter of this book.
Page Objects View
This view is used to see the database objectson the application page.
The Page Objects View is accessed by selecting the
Objects option in the View select list as shown in Figure 6.6 and
pressing the Go button.
Page History View
This view is used to see the history of changes
made to page components on the application page. It will show the
changes made and by which developer. It is also possible to see the
history of when the page was locked and unlocked.
Page Export View
This view provides another way of exporting an
application page. This option has generated a lot of questions on the
HTML DB forum. The export implies that it would be possible to import
the page into any other application, but that is not the case. An
exported page can only be imported back into the same application id
that exported the page. The value of exporting an application is so
modifications can be made to the application, and if something goes
wrong, the page can be re-imported to get back to where you started.
Page Groups View
This view will
show the other pages that belong to the same group as the current
page.
Page References View
This view displays the other application
components that reference this application page. Figure 6.7 shows
that a breadcrumb menu, two branches on pages one and three, and a tab
have links to this page.
Page Rendering
Page rendering is the action taken by the HTML DB
engine to render the application page in a browser. The Events view
of an application page shows the Page Rendering execution order, shown
previously in Figure 6.6. The events view shows the order in which
page components such as regions, buttons, items, computations, and
processes are executed. Page rendering is also covered later in this
book in the section on Page Processing.
Page Level Computations
Computations can either be processed while the
page is being rendered or while the page is being submitted. A page
level computation can be used to set the current date and time of a
page item.
Page Level Processes
Processes can either be executed while the page is
being rendered or while the page is being submitted. There is a
significant difference with each. Page level processes are considered
for execution as the page is being rendered. This is handy for
executing a page process that is used to populate the page items on
the page.
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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