Friends,
I'm facing another challenge in APEX and I hope you can help.
I have created a tree using the method described in John & Scott's superb book, "Pro Application Express" whereby the page link is stored in a table. Below is an example:
go to a page passing some parameters
f?p=&APP_ID.:3:&SESSION.::::P3_IDENTIFIER,P3_FAMILY_NAME:&P2_IDENTIFIER.,&P2_FAMILY_NAME.
When the page is run this works as expected. I can expand the tree and navigate to the page passing parameters if required.
Ho开发者_如何学Pythonwever when I turned on session state protection these "hand crafted" links stopped working. Which I expected because the link contains no checksum.
After some investigation I see I have to use APEX_UTIL.PREPARE_URL to generate the URL with a checksum. Unfortunately this is where I run into problems. I can't seem to be able to pass the parameters values to the calling page.
The original tree query was:
select "IDENTIFIER" id,
"PARENT_IDENTIFIER" pid,
"TITLE" name,
"LINK" link,
null a1,
null a2
from <some table>
I then changed this to use APEX_UTIL.PREPARE_URL:
....
APEX_UTIL.PREPARE_URL('f?p='||:APP_ID||':3:'||:APP_SESSION||'::::P3_IDENTIFIER,P3_FAMILY_NAME:&P2_IDENTIFIER.,&P2_FAMILY_NAME.') link,
...
and this works, the page is called and I can see the values of the parameters passed. But I can't use this method as it is restricted to the one page!
Finally I tried storing the page number, parameters and parameter values in different columns of the table that the tree is based on and then bring them together:
...
APEX_UTIL.PREPARE_URL('f?p='||:APP_ID||':'||navigate_to_page||':'||:APP_SESSION||'::::'||parameters||':'||parameter_values) link,
...
Where:
navigate to page has the value of: 3
parameters has the value of: P3_IDENTIFIER,P3_FAMILY_NAME
parameter_values has the values of: &P2_IDENTIFIER.,&P2_FAMILY_NAME.
This now calls the page, but the parameter values have become literals. so where I'm expecting an identifier I see &P2_IDENTIFIER and ditto for family name.
What am I doing wrong? How can I pass values to my called page using apex_util_prepare_url?
In case of need, my environment details are: Apex 3.2.1, Oracle Application Server 10.1.2.3. Oracle Database 10.2.0.3
Thanks in advance for any help you may be able to provide.
I think you'll need to resolve those variables, using the v() function:
APEX_UTIL.PREPARE_URL('f?p='||:APP_ID
||':'||navigate_to_page
||':'||:APP_SESSION
||'::::'||parameters
||':'||v('P2_IDENTIFIER')||','||v('P2_FAMILY_NAME')) link,
On a side note, you might need to be careful about P2_FAMILY_NAME
since it's being used in the url; it sounds like a plain text field which contains user-entered data?
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