Saving composition/session state to a server for reloading later

We are creating an interactive quiz for children of up to 20 questions and loading each question into a quiz controller window but the memory is maxing out on tablets causing the browser to crash after 10 questions.
Is there a way we can save a browser's session state on the server side (or client-side) so that a user can come back to a question later and continue from where they had previously left? Perhaps cloning part of the sym object and saving it as a json array?
Thanks

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In an eMail message, when I attempt to save two photos by clicking the 'Save 2 Images' link, not the 'Save Image' link, the images are not saved. (I use I I apologize for the late notice, butOS7 on IPhone5). Is this feature broken?

Please don't post the same question multiple times!

Number of user sessions in the Application Server for a config entry

Hi All
I am using 10g AS, with 9i DB.
My requirement is that -
i need to find the total number of users of the application in any moment, and to
display that information to the users. say, config=abc, super users need to find all
those who are using the link from the application itself.
I can see that information from the 10 g Enterprise Manager -> Forms -> User Sessions.
But is there any means of transfering that information to forms.
Can this be done by using PJC's ?
Please post your solutions/suggestions
Thanks in Advance
Deepa

Any help/ideas Please
Deepa

Saving session state during pagination

See
http://htmldb.oracle.com/pls/otn/f?p=24317:152
I hacked into the PPR function to save the checkbox value into session state during pagination.
Is there a way to do something similar for checkboxes in the report itself rendered using htmldb_item.checkbox()?
Or is this an ill-advised effort?
[The UI requirement here is clear...I have a bunch of items over many pages and I want to select them using checkboxes and have the selections remembered as I paginate back and forth.
If you use Yahoo Mail, Compose a new message, click on the Insert Addresses link and it pops up a window with all your contacts, you can select them using checkboxes and go to the Next/Previous page and it remembers the selections]
Thanks

See
http://htmldb.oracle.com/pls/otn/f?p=24317:152
Click on the Create/Reset collection button to initialize your own private collection to play with.
The checkboxes are remembered as you paginate thru the resultset. Basically, the state of the checkboxes is saved into session state using htmldb_Get before calling the PPR function to get the next/previous rows.
Carl, let me know what you think of the approach. Is it a viable approach? Any caveats?
[Unfortunately, I had to to make a copy of the builtin html_PPR_Report_Page function to make the above modification in it, didnt see a way to avoid it]
Thanks

Saving session state

Hi Everyone!
We are looking for an easy-to-use solution for saving the session state in whole.
(We are aware that it is possible to save the sesion state for a single item.)
Our goal is to get a single commando which restores an whole session to another session. We would like to be able to save a session, purge the session (because of old age) and restore it's session state again to a new session.
any ideas?

Hi,
I was thinking that a pointer to the Session object could be stored in a database on the initial loginAre you by any chance referring to the pointer similar to the one that is used in C? If so I guess it is not available in java.
One possible solution where you can persist data across sessions is by the use of stateful session beans. Also you could experiment with the different scopes of the object for achieving your goal.
I hope this helps you. In case I have missed out something please do post again.
Cheers
Giri :-)
Creator Team

Problem with application item and session state

Okay, let's see if I can explain this problem coherently.
I have a small app (one page), with an application item, F_WHERE_CLAUSE.
This page has three regions in which there are items that the users can populate for search conditions. A couple of these items are "select list with submit" (I still need to upgrade to the AJAX method, I know). There is another region which has one hidden field, called P1_WHERE_CLAUSE. This field is defined to "Always, replacing any value in session state..." with source type of "Item (application or page.....", and a source value of F_WHERE_CLAUSE with no default value.
I have a button called "Search" which submits the page and fires a PL/SQL process which builds a where condition based upon the other page items and stores the value to the application item F_WHERE_CLAUSE (correctly).
For testing, I've made the P1_WHERE_CLAUSE field visible so that I can see what's going on. I've also clicked the debug and session buttons to help trace this. After I click the "Search" button and the page submits, debug shows:
0.02: ...Session State: Save "P1_WHERE_CLAUSE" - saving same value: "1=1"
followed later by:
0.05: ...Session State: Saved Item "F_WHERE_CLAUSE" New Value="lower(primary_class) = 'rock' and country = 'Spain'"
The field P1_WHERE_CLAUSE displays with the correct search criteria as signified by F_WHERE_CLAUSE above. However, If I click the "session" button to view the session state values, P1_WHERE_CLAUSE shows up as:
P1_WHERE_CLAUSE Textarea 1=1 U while F_WHERE_CLAUSE displays the correct value still.
The reason this "problem" came up, is that this page also has three SQL report regions which use &P1_WHERE_CLAUSE. for the where condition. While they display the correct results on-screen, each report region also has the "Export to csv" enabled, and the export seems to be using the "1=1" condition (from the "session" window) instead of the search criteria that the on-screen region is using (F_WHERE_CLAUSE and the displayed P1_WHERE_CLAUSE), resulting in a retreival of all records.
Anybody have any idea what's going on and why, and how to get the csv export to use the correct value for the where condition?
Thanks,
Bill Ferguson

It appears the "Export to CSV" functionality requires the item value to be set in session state. The P1_WHERE_CLAUSE item value never gets saved to session state. The page is rendered and the value is put in the item on the page but until you submit the page session state doesn't know what P1_WHERE_CLAUSE is.
Create a before header computation or process to set the value of P1_WHERE_CLAUSE (which will save it to session state). It is interesting that the report regions didn't need to look at the value in session state but the "export to csv" does.
--Jeff

Setting session state post-authentication

Hi all,
This application uses DATABASE ACCOUNT authentication, and has a post-authentication process that sets a few application items using code such as
apex_util.set_session_state('F_MY_ITEM', v_my_value);These items are used to secure certain tab options within the application.
The post-authentication PL/SQL works fine, I can't see anything wrong the the logic. I've debugged it and I know the values are being set. I'm checking the value of session state straight after using v('F_MY_ITEM'), along with checking my session ID matches up - everything seems ok there.
The issue is that when I log in, the session state is not set for those items - even though the post-auth process is called with no errors raised. Apex debug states
... Session State: Save "MY_ITEM" - saving same value "Y"If I log out, then log in (without closing browser tab), the values are now set as expected (visual confirmation using conditionally displayed tabs, and of course checking session state from developer toolbar)
Notably, Debug states something slightly different
... Session State: Save item "MY_ITEM" newValue="Y" escape_on_input="Y"There are a few other differences with the debug output, this this seems the most pertinent.
The only difference I've been able to track down is if I'm logged into the application builder in the same browser.
If I attempt to log in with a freshly opened browser, navigate directly to application URL, the behaviour works as expected. Tabs appear as if items are set.
Could the fact I'm authenticated in the application builder be messing with session state behaviour?
This is with Apex 4.0.2.00.07; agnostic to browser (IE/FF/Chrome); 11gr2
Cheers,
Scott

I did consider this because I experienced the same thing with page processes.
However, in this case my post-auth function is within a package and I don't use bind variables.
I was essentially doing this in my package:
apex_util.set_session_state('F_MY_ITEM', 'Y');
my_log_proc(v('F_MY_ITEM'));And seeing Y in the debug log, yet once on my home page, viewing session state I see F_MY_ITEM as empty - unless in the scenario I described.
It's not a showstopper since the users won't be logged in to the application builder, but it would be nice to know the cause.

Session state - Whats the big deal?

What is the equivalent of HTMLDB's "session state" in other peer environments, like, for instance, ASP/ASPX pages?
There, you would just define a bunch of variables and use those on the page, right?
How does the fact that HTMLDB's "variables" are stored in the database benefit me? All I care about is being able to read/write my "variables" from various points in my application.
Thanks

Vikas,
Session state needs to be maintained somewhere. Then, on a subsequent page view/submission, you are essentially reunited with your session state. This is applicable to almost all Web technologies.
Most technologies persist session state in application server middle-tier memory, which is very finite (.NET supports configuration of both, memory or database). Think about it...if you have 2GB RAM on your middle tier, how many "concurrent" sessions could you support maintaining session state in memory for all your users? What type of elaborate mechanism would you have to employ to ensure you don't exhaust middle tier resources?
I've built/used/monitored real-world applications built using HTML DB, which would have over 6,000 distinct users in the peak hour, yet at any given split microsecond, there were no more than 8 - 10 active database sessions. In an alternative architecture, how much middle tier memory would it take for you to support 6,000 distinct user sessions in an hour? How long before you start expiring these sessions?
Joel

Session state protection violation

I turned on the session state protection on my application, the setting for Application Item, Page Data Entry Item and page display-only item are "checksum-required, application level". I want the URL to be shared by user in different sessions (for example bookmark). when I open two browsers (IE, Firefox) and login as same user, I copied/pasted url from one browser to another and received "Session state protection violation: This may be caused by manual alteration of a URL containing a checksum or by using a link with an incorrect or missing checksum."
Did I misunderstand the intent usage of this feature? I also noticed that checksum generated by the system remains the same no matter what checksum level I set (application, user, session).
I am running APEX 3.1.0.00.32.

Cheng-Lu,
I didn't forget you, this was a very difficult problem to debug.
I think I have a workaround for you. I added a page process to your login page named "fix deep link item". This restores the value of FSP_AFTER_LOGIN_URL that gets passed to this login page and is supposed to be immediately saved in session state. Due to a bug, this value was getting truncated to "f" before it could be saved. The new page process looks at the current URL and uses the value there which is still intact and saves that value in session state. I tested it with your applications. Please let me know if this works. We'll make a proper fix in the 3.2 release.
So this was not a problem with session state protection but in the "f" procedure which parses argument names/argument values in f?p URLs. This gets tripped up when an argument value contains a pattern like &cs= which is first treated as an argument to the orignal "f" call and therefore is never seen as an argument value in the list of arguments.
I have some other observations about your applications. I see that they have code in the page sentry function attribute of the authentication scheme. The code you have in there is completely unnecessary and could actually make the application less secure. You should leave this attribute empty and let the default (built-in) page sentry do all the work.
Scott

Session state consistency - how does APEX keep session state across pages

I would like to know how the APEX develper tool keeps session state from being overwritten across mutiltple pages in the same Session. Because this is difficult to explain I'll use an example from withing the APEX dev tool
For Example:
1. I navigate to the page (4150) thet allows me to edit my Page 880 [Window 1]
2. I now do a Cntrl^N to Open a New Window in the same session (this opens on the same Page 880 in the new window) [Window 2].
3. In Window 1, I click an item to update ie I want to put a comment on the Unconditional Branch so click this to go to the Update page. I see the F4000_P4313_ID is passed in the URL (ie the context, UID of the Branch).
4. In Window 2, I change the page to 881 - ie this is overwriting my Session State variables for page 880 with page 881.
5. I click an item in Page 881 to update ie I want to put a comment on the Unconditional Branch so click this to go to the Update page. I see the F4000_P4313_ID is passed in the URL (ie the context, teh UID of the Branch).
6. In Window 1 (the Page 880), I add a comment to the Branch and 'Apply' changes. On returning to the Page the context has changed from 880 to 881 (as expected as Window 2 had overwritten the session state). Slightly confusing for the user as they did go from Page 880 not 881 but ok
What intrigues me is how the Edit Branch page applied the update to the correct branch [good !]. Why weren't the Branch Session state variables (ie the Branch for Page 880) overwritten with the Branch Session state variables for the Branch from Page 881 ?
Both navigations go to the same Page passing the UID of the branch, hence I would of thought the last navigation is the one that would be persisting (ie from Page 881 Window) ?
Any tips on preventing users updating the wrong record because of the Session State being overwritten would be most welcome.
Look forward to hearing from you.

Let me take a shot at explaining this.
Session state is stored in Oracle database tables. When a APEX page is rendered, those tables are read and the HTML is sent to the browser. When that page is submitted, all the HTML form inputs on the page are saved back into session state over-writing any existing values for that session
So, in your example, since Page 4313 has the hidden page item (the "GUID" of the branch), it doesn't matter if any other window has the same page open with some other GUID. Each page is a self-contained "unit" which has all the information necessary to properly process that page when it is submitted.
Think of it this way...in your example, when you have windows 1 and 2 open (window 2 was opened after window 1), go back to Window 1 and click the browser's Reload/Refresh button. Instead of refreshing the same page (branch 9000000), you will find that it will load branch 8000000! This is because session state is read from the database and when Window 2 was rendered, it has set F4000_P4313_ID in session state to 8000000.
Hope this helps.

4.2 select list on mobile page not setting session state

Hi,
Like I've done dozens of times in the past, I created a Select list that submits on change, and I expected session state to be updated accordingly.
I tried this on a mobile page but session state is not updated for the item.
Has anyone else experienced this?
Scott

Hi Scott,
is it possible that you are hitting bug# 14680379 - PAGE SUBMIT ACTIONS DO NOT WORK FOR LONGER MOBILE SELECT LISTS, WHEN DEFINED TO FIRE WHEN THE SELECT LIST VALUE CHANGES
on our Known Issues List http://www.oracle.com/technetwork/developer-tools/apex/application-express/apex-42-known-issues-1863578.html ?
Is your select list selection displayed as native control or as popup? Can you create a test case on apex.oracle.com?
Thanks
Patrick
My Blog: http://www.inside-oracle-apex.com
APEX Plug-Ins: http://apex.oracle.com/plugins
Twitter: http://www.twitter.com/patrickwolf

How to reference session state in a list entry label

You can use &<item>. to reference session state values which can then be used in titles and item labels but it seems it does not work in the label for a list entry (i.e. to build a menu). Is there a workaround?
thanks in advance
PaulP

OK I just realized that referencing session state doesn't work for lists used by Enkitec's NavBar plugin solution. It does reference the &<ITEM>. correctly for normal APEX lists. Anyone know how to reference session state when using Enkitec's NavBar plugin solution?
PaulP

Session State Protectio Violoation in Apex 4.2 Page Items

I'm testing my Apps that I upgraded from 3.2 to 4.2 and getting the message below and haven't been able to understand why.
Error Session state protection violation: This may be caused by manual alteration of protected page item P2_PAY_NO. If you are unsure what caused this error, please contact the application administrator for assistance
How the Page works.
1. Before Region Process runs that pre-populates some of my Text Items.
2. The user then has the ablibity to select from a select list item that will re-populate the items populated during the Before reqion based on the date selected.
I do this by calling the code below with an "onchange="javascript:date_populate(this);" on the HTML Form Elements Attributes.
{var myString = $x(pThis).value;
var mySplitResult = myString.split("|");
$x('P2_START_DATE').value = mySplitResult[0];
$x('P2_PAY_YEAR').value = mySplitResult[1];
$x('P2_PAY_NO').value = mySplitResult[2];
$x('P2_PICT_CODE').value = mySplitResult[3];
$x('P2_END_DATE').value = mySplitResult[4];}
3. When I submit the page I get the Session State Violation.
All Items have "Session State Proection" set to "Unrestricted"
Session State Protection is "Disabled" for the application.
Edited by: spuchc on Apr 12, 2013 2:07 PM

Check you are not updating items of type "Display Only".
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.apress.com/9781430235125
http://apex.oracle.com/pls/apex/f?p=31517:1
http://www.amazon.de/Oracle-APEX-XE-Praxis/dp/3826655494
-------------------------------------------------------------------

Session State Protection breaks Cascading LOV.

Hi,
Whenever I turn Session State Protection on my application , with option 'Arguments Must Have Checksum' on the page level,
Items defined with a cascading LOV will not work. Once session state protection is on for the page, and I change the value of a parent
LOV, the Child Item LOV (defined with Cascading LOV) will not show any value and the 'round working icon' will just keep on going
and does not end, The Child/Cascading LOV seems to be just hanging and not return any values. This happens consistently (APEX 4.1.1.).
There are no threads existing for this behavior, would like to know if this is a known issue and if there is a fix.
Thanks,
Ramon

The documentation says, "If you need to set this item's value in session state using Ajax, then an Unrestricted protection level must be used for the item (for example in Dynamic Actions, Set Value, Page Items to Submit or Cascading LOVs, Page Items to Submit)." In practice, what this means (among other things) is that items that are identified as "Cascading LOV Parent Item(s)" must have "Session State Protection" set to "Unrestricted".

SSP broke my LOV :-( - Session State Protection Issue

Hi Folks.
I'm tinkering with SSP on my application.
Here's the challenge du jour.
If I enable SSP across the entire application I can't even log in. That was resolved by setting the login page to 'Unrestricted'. not sure of the security implication of doing that but bear with me.
My main Issue is this.
I am using Patrick's APEXLIB for Cascading LOV functionality.
My Parent LOV works fine.
My Child LOV is blank.
I have modified everything on the page to 'Unrestricted' and still I end up with a blank child LOV.
Any ideas how to skin this cat?
Many thanks
Simon

OK so here's how i 'fixed' this issue. I say fixed but I would welcome any comments regarding the security impact of the 'fix' I came up with.
First of all I enabled SSP across the entire application
Page Access Protection = Arguments Must have Checksum
Application Item Protection = Checksum required - Session level
Page Data Entry Item Protection = Checksum required - Session level
Page Display-Only Item Protection = Checksum required - Session level
This had the desired effect of applying these settings to everything.
Having done that I needed to update the SSP to Patrick Wolf's Application Items in the following way...
APEXLIB_REFERENCE_ID = Unrestricted
APEXLIB_REFERENCE_TYPE = Unrestricted
As a side note, I noticed that the Application Item FSP_AFTER_LOGIN_URL was also set to Unrestricted. I guess this is enforced by APEX to allow successful login to the application. All other application items were set to Checksum Required - Session Level as per the cross-application configuration I had initially done.
Finally I had to review the pages that had the cascading LOVs that no longer functioned. For these pages I had to set the "Item Session State Protection" to Unrestricted for the poll down LOVs used in the Cascading LOV process. Parent LOVs and Child LOVs.
The end result is that I have pretty tight SSP enabled across the entire application. The only areas where it is 'Unrestricted' are some of the cascading LOVs.
I would be very interested to hear from anyone who would care to comment on the security weaknesses this approach may have created.
I will update this thread if the SSP enabling has affected anything else in the application. So far though, it's only the Cascading LOVs.
Kind regards
Simon Gadd

Saving composition/session state to a server for reloading later

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