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

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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-)
If someone's response is helpful or correct, please mark it accordingly.

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?
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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
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Hello, on Mac, when I make a .pdf from a .doc, Acrobat reverses pagination. How do i stop this and get normal order 1,2, 3 ... ? And how will I know whether any good soul has answered, thanks much.

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How to know whether any item value got changed

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