Is it possible to know if an item value has changed

Hi,
I'm working on a form and need to know if an item value has changed without compare it with database_value of get_item_property. there is a button <save> on the form and i want to know when user click again and again on button save if this item value has changed. thanks for your ideas.

Tabit7 - Posted: Apr 9, 2011 12:15 AMbut sometimes in query mode, the item is not navigable and its vallue changed and the prev_value did not work, perhaps the w-n-i-i do not fire>
If you look up the trigger in the Forms Help system it will tell you if the trigger will fire in Query Mode. The WNII trigger will file in Query Mode where as the Pre-Text-Item trigger does not.
i try an other way and it seems to work, i put a flag in w-v-i when database_value is different from block value and use this flag in button Save, thanks a lot for your idea it put me in the way. Glad you were able to find a way to resolve your issue. ;-)
HamidHelal - Posted: Apr 10, 2011 9:27 AM can you please give an example of u'r idea ? >
First, create a variable that is visible to the entire form. Many people would simply use a GLOBAL variable, but I do not like the limitations of GLOBALs and I don't like the fact that they are visible to the entire Forms sessions, not just my form. I prefer to use a Forms program unit (PU) Package Specification so I can explicitly define the variable data type (eliminates the need to cast the GLOBAL to the correct data type) and the variable only occupies the amount of memory needed to support the variable. Also, when I exit my form, the variable is automatically erased.
/* Sample Forms PU Package Specification */
PACKAGE Form_vars IS
g_prev_val VARCHAR2(50);
END Form_vars;No that I've created a variable to store the Previous Value of an Item, I can write code to use it. I will use a Form Level When-New-Item-Instance (WNII) trigger to ensure I capture the value exiting value of the item before any changes.
/* Sample WNII trigger */
BEGIN
Form_vars.g_prev_val := Name_in(:system.trigger_item);
END;This is a very simple example. There are many other ways to implement this method; such as using the Pre-Text and Post-Text-Item triggers as Abdetu suggested.
Craig B-)
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Knowing when an item value has changed

Hello
If you have a item in a form - :P1_fred which is a database columm fred
The database table conrtaining fred columm is read and updated by
1) Automated Row Fetch
2) Automatic Row Processing
This works fine
I need to add a condition based if the valve of :P1_fred has changed.
My currect way at the monument is to record the value after the Automated Row Fetch to :p1_fred1
Then compair :P1_fred to :P1_fred1 and before the coniition before Automatic Row Processing
Whiile this works, is there a simple way of doing this?
Thanks
Pete

Hi Pete,
I never do "By Reference" (or OUT) for parameters - I tend to create functions instead of procedures and do:
SELECT check_file_one(:new.key) into status1 FROM DUAL;or something similar.
From what I can see of the create procedure guide, you can use as many OUT parameters as you like: http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_6009.htm#sthref7098
The only time I've seen anything similar is when one process has terminated and cleared out the variables. But this was when I'd have / or GO in the procedure itself.
What happens if you create a second variable for status1 (say, status1copy) and set this as "status1copy := status1" immediately before the second procedure call - does status1copy retain its value?
Andy

How does an NSTextField know that it's value has changed?

I have a textfield that can either be edited by hand, or set through another control. (It's a page number, so you can jump to page 16 by typing in 16, or you can page up and down with the next/prev buttons) I have the value of the text field bound to an int page variable.
It seems to work correctly, when you type a page number in, it jumps, when you page up and down, the page number in the text box changes appropriately.
However, at some level, when I page up and down, the text box doesn't seem to know that it's value has changed, because if I type 1 it doesn't do anything. It doesn't call the bound set-method or anything. It looks like the textfield is thinking "I'm already 1, so I don't need to do anything." Even though it was 5 because I hit next 4 times. If I type an number other than 1, it goes there. If I THEN type 1, it goes to page 1, because now it thinks it's on that other page.
The problem seems to be that I'm changing the value of the textfield programatically, but some part isn't getting the message.
Does this seem like a reasonable explanation? And either way, any ideas on what's causing it?
thanks

Solution: in order for the textfield to behave properly, I need to do everything through the bound instance variable.
The problem was that the "page" instance variable doesn't actually exist, there's a page method and a setPage method, but the actual page is kept elsewhere. When I make sure to call the setPage method from the next/prev code, it seems to work.

Q:Determine if a item value has changed

Hello,
I am sure I am missing something basic but I just can't figure out how to do accomplish this.
I have a form with a radio button (Yes or No) which I need to determine in a Page Process if the user has changed the value to Yes or not. The result of this will decide if I am going to send an email or not.
I am running APEX 4.2.1.
Anyone?
Thanks
Andy

Okay.
1) For the Dynamic Action:
You want the Action to be "Execute PL/SQL Code".
Under Settings, in the code window just put the single "null;" satement.
Under Settings, for Page Items To Submit - Pxx_RADIO -- note - no colon here!
Under Setitngs, for Page Items to Return - Pxx_RADIO_LAST -- not no colon here!
(And don't put both Items on both line because that just causes a lock up when executed.)
2) The only down side is that if you display Pxx_RADIO_LAST, it will not show it's value until the Pxx_RADIO is change and the values is return in the Dynamic Action. But as soon as it's returned, it's the old value of Pxx_RADIO. And if Pxx_RADIO is toggled, Pxx_RADIO_LAST remains that initial value that it was when first set. If you want to see Pxx_RADIO_LAST on the screen when the page renders, I suppose tou need a DA to save it to the session state when it's set in the before header process.
If you want, look here on p. 5.
Workspace: SIMPLE_DEMOS
UN: hcarson at woh.rr.com
PW: SD123456789
RADIO_DEMO ID:25096
Dever / Ima9Dever
Page 3: Radio Group
Page 4: Checkbox
Page 5: Hidden Item Demo
To see that the value is saved, Set Radio Group to "Yes" and then go to p. 4. Go back to p.5 and "Yes" will be still be set but the Text Field -- I changed to Text from Hidden -- will be blank. When you click No, then the "Pxx_RADIO_LAST" value of Y will appear here. (Make sense?)
Howard

How to know whether any item value got changed

How to know in Apex whether any form item got changed. That will help me to know when the user will be pressing the "Apply Changes" button and I will popuplate the "User Modifed" and "Date Modifed" column values in the table. For now, I dont want to write database triggers, but to implement it at application level.

Hi Deb
For a really good explanation of the naming /numbering of tabular form items see Patrick Wolf's blog on the matter.
http://www.inside-oracle-apex.com/which-tabular-form-column-is-mapped-to-which-apex_applicationg_fxx-array/
He also gives a simple example of using check-boxes in tabular forms here
http://www.inside-oracle-apex.com/checkboxes-in-tabular-forms-the-easy-way/
You will notice in his example, that the apex_application.g_f40 is specifically named as 40 - a high number assuming that you don't have more than 39 editable columns in you tabular form - shown in the name="f40" code.
<input type="checkbox" #ADMIN_USER_CHECKBOX# value="#ROWNUM#" name="f40" id="f40_#ROWNUM#"/>#ADMIN_USER_CHECKBOX#
In essence the columns are numbered (only the editable ones) in the order in which they appear in the select statement - so the first editable column will be f(01), next f(02) etc - except where the column is specifically named - in this case f(40).
I had a situation where I wanted to programatically stamp the user's name into a column depending on whether the user checked a check-box in each row.
But if the column is editable and visible, then the user is free to type into this cell - this I wanted to avoid.
Something that took me a while to work out is that you can hide an editable column - so it can updated by your procedure code - not by the user!
The way to solve this is to have the sql statement select the relevant column twice - the first one is the editable one and hidden, and the second copy is a normal report column - displayed but not editable.
I used Patrick's example in the link above to set up my tabular form with the first column as a check-box.
The user then marks the desired rows by clicking in the check-box and submits / saves.
The procedure then detects which rows have been checked - updates the editable (but hidden) database column, and then re-displays the result - with the second copy of the same column now showing the updated value!
I hope this helps.
Look at Patrick's other postings - they are so helpful.
Mike

How to find if item's value has changed without leaving the field

i am using timer in this one appilcation , where i am letting the user define the time in minutes like (30) ..Is there any way to know after they change the value of that item lets say to 40 so that i can execute some other statements.
i have tried post-change and post text item ...
thanks.

You could use a timer, and then in the When-timer-expires (WTE) trigger, try Validate(Item_Scope). Try that, and see if it will cause the when-validate-item trigger to run.
If that does not work, then in the WTE trigger, move the cursor out of the item. THAT will definitely cause the WVI to run if they have made a change. However, moving the cursor back into the field may cause problems with cursor position and also with the contents of the item selected (highlighted).

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what I want to do is:
I want to find out the diffrece of before my java programm runs and after that, i think two way:
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null

BigDaddyLoveHandles wrote:
Prediction: he'll be a bitter and abusive forum member, if he's still around, in less than one year.That's hardly fair. With provocation like that, it's bound to happen

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Created Page 0
Created an HTML region in COLUMN 2 and SEQUENCE 10.
Selected under region CONDITION:
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in the EXPRESSION 1 provided the requested comma delimited list of pages that I wished the HTML region to appear.
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In SHARED COMPONENTS I created an APPLICATION COMPUTATION
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BEGIN
IF :P0_RADIO IS NULL THEN
RETURN 'A_ALL';
ELSE
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END IF;
END;
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Is it possible to submit a list item and at same time query/search the results if parameters are matched.

Hello,
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Manish

Hi Manish,
may i ask if you need,
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Possible to clear vendor open item against already posted payment document?

Hi
Can you advise if it is possible to clear an open item against already posted payment/clearing doc? Here is the background to the scenario:
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Is there perhaps some configuration setting that stops the placement of the paymnet document as an open item when reset?
Thanks for your help again.

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Hi
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Is it possible to know if an item value has changed

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