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Oracle Tips by Burleson |
Buttons
Buttons are used to submit or post the application
page to the HTML DB engine. They can also be used to redirect one
page to another page or a URL without submitting the application
page. The differences between the two are:
-
Submit Page and Redirect to URL: This type of
button will submit the page to the HTML DB engine and save page item
data in session state. When creating a button with this action, a
page Branch will be used to determine where the navigation will go
from here.
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Redirect to URL without submitting page: This
type of button will simply navigate the browser to another
application page or URL without posting the page and no page item
data will be saved in session state. This type of button does not
utilize a Branch to know where to navigate; that information is
stored as properties of the button.
When creating buttons, the developer is asked to
provide a button position. The location of the button in the region
is the determining factor when deciding the button position. There
are two positions from which to choose:
Create a Button in a
Region Position
When a button is created in a region position,
HTML DB is being told the button is to be rendered in a position
defined in the region templates. This is the more common position to
put buttons. The available positions are shown in Figure 10.6.
Figure 10.7 below shows the region positions as
indicated by the button labels. This Figure is of the upper right
corner of a sample region created by the author in order to determine
where each of the positions is located.
Figure 10.8 below shows the remaining positions
for buttons created in a region position. Notice the buttons that are
aligned to the left side of the region. These have the alignment set
to left. The default alignment when creating buttons is to the right.
Figures 10.7 and 10.8 can be used as a reference
when buttons are added to application pages to a region position.
When a button created in a region position submits
a request to the HTML DB engine, the REQUEST is set to the name of the
button unless specifically set in the Optional URL Redirect section of
the button. The Optional URL Redirect will be covered later. Once
the REQUEST is set to the button name, it can be used in conditions
for other page components for conditional processing.
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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