Populate tabular form items based on LOV in header

Hi,
I have an LOV (Select List with submit) defined as the item in the same region as a tabular form. I'm using the first row in the LOV as the default value.
Following is the query for the LOV:
SELECT team_code ||' - '|| description as d, team_id as r FROM cp_teams ORDER BY team_id
If the user selects a value in the LOV it would then automatically refresh the tabular form based on LOV's return value. But initially I want the tabular form to be populated using the LOV's default value.
Problem 1) When I log in for the first time and navigate to the page, the LOV displays correctly but it shows an error below it:
report error:
ORA-01722: invalid number
Surprisingly, after I have submitted the list more than once, I never see this error again until I exit.
Question 1) Does this mean that for the first time, the LOV is not being "submitted" and thus tabular form underneath it has nothing to show?
How do I automatically submit the lov as soon as I navigate to the page?
Problem 2) I have a field (item) TEAM_ID in the tabular form's query which should take the TEAM_ID passed from the LOV for every new record that is created.
Question 2) How do I initialize this field for a new record from the "header" LOV? The ultimate objective is to have the TEAM_ID populated for all the records created in the tabular form.
As you can see I'm a newbie to APEX so I'd appreciate any help.
Thanks,
Sunil

Sunil,
1. what is the null value for your header LOV. I usually use 0 or some other numerical values. You will need a computation for that LOV with a condition ITEM VALUE IS NULL in
order to run it only once per session.
2. In the properties of your column - Tabular Form Element - you can set the default value
to an item value (application or page item name).
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/apex/f?p=107:7
http://htmldb.oracle.com/pls/otn/f?p=31517:1
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Similar Messages

Is there a way to enable/disable a tabular form item based on the value of a second item?

Hi Everyone,
I have a tabular form based on a collection. The column c050(maps to f30) will be either Y/N. If it is Y, then I would like to enable column c024( maps to f24) (which happens to be a radio button based on lov). If the value of c050 = N, then disable c024. There are potentially many rows, and the item c024 would only be enable/disabled for the specific row. So if row 1 has c050=Y and row 2 has C050=N then row 1 c024 is enabled, and row 2 c024 is disabled. Hope that makes sense.
I have created a dynamic action called enable/disable HMS fields.
event=CHANGE
selection type = jquery selector
jquery selector = input[name='f30']
condition EQUAL TO
value Y
true action1 - enable, jquery selector, input[name='f24']
true action 2 - alert, You have added an HMS Species. There may be additional data to enter. thanks
false action1 - disable jquery selector, input[name='f24']
false action2 - alert, no hms worries.
The alerts in both cases show properly...but nothing seems to happen to f24.....what am I doing wrong?
thanks

Agh! This is the first time you mention this is a radio button! That changes things a lot! As you can see, the format is different (f24_0001_0001) than what we have discussed (f24_0001).
Radio buttons have their own quirks. My bad, I should have asked what you had. But since you said your original selectors on input were working I just thought these were text fields or something like that.
How about you change it to a drop down list just so that you can see all work? And fully understand it.
Then you can work out the radio button option.
If that doesn't get you there... I'm going to ask you setup an example in apex.oracle.com and give me credentials to log in and take a look.
I could re-try the js on my side with a radio but it will take some time.
So just to be clear... f30 is a drop down and f24 is a radio?
See, this line:
$x_disableItem("f24_" + row, true);
Is NEVER going to find the radio buttons because it's missing the 3rd 0001 and 0002 (how many options do you have?)
So perhaps you try it like this:
$x_disableItem("f24_" + row + '_0001', true);
$x_disableItem("f24_" + row + '_0002', true);
... keep going for the options...
Do the same for the false of course.
But I think this needs a better approach if you'll have radio buttons. I just need to work it out.
Ok, go try things...
Thanks
-Jorge

Help using a dynamic action to update tabular form items (specifically radio button) based on collection

Hi Everyone, I have posted this question in the past and made huge progress with Denes Kubicek's help: https://apex.oracle.com/pls/apex/f?p=31517:294:115851992029365::::: based on my earlier question posted: https://forums.oracle.com/forums/thread.jspa?threadID=2537494
I am struggling with one item in my tabular form. It is a radio button. The choices all appear properly, but the value is not saved in the collection (and hence, not saved in the table). All other items in the tabular form save properly.
here is what I have for the query.   It is item c024 (which maps to ;'f03'), which is defined as a radio LOV based on an existing LOV.
Currently I have:
2 page items:
P110_ID
P110_VALUE
Dynamic action called CHANGE COLUMN:
event: CHANGE
selection type: jQUERY Selector
jQuery:
jQuery Select = input[name='f03'],select[name'f08'],select[name='f09'],input[name='f10'],input[name='f11'],input[name='f12'],select[name='f40'],input[name='f21'],input[name='f22'],input[name='f23'],input[name='f50']
event scope: Dynamic
true action#1: set value P110_ID javascript expression this.triggeringElement.id
true action#2: set value P110_VALUE javascript expression this.triggeringElement.value
true action#3: execute pl/sql code
declare
v_member number;
v_seq number;
begin
v_member := TO_NUMBER (SUBSTR (:p110_id, 2, 2));
select ltrim(substr(:p110_ID,5,4),'0') into v_seq from dual;
safis_collections.update_column(v_seq,
                                v_member,
                                :p110_value);
true ation#4 refresh region :LANDINGS_COLLECTION
the tabular form is based on the query:
SELECT
apex_item.text(1,seq_id,'','','id="f01_'||seq_id,'','') "DeleteRow",
seq_id,
seq_id display_seq_id,
apex_item.text_from_LOV(c004,'SPECIES')||'-'||apex_item.text_from_LOV(c005,'GRADE')||'-'||apex_item.text_from_LOV(c006,'MARKETCODE')||'-'||apex_item.text_from_LOV_query(c007,'select unit_of_measure d, unit_of_measure r from species_qc') unit,
apex_item.select_list_from_LOV(8,c008,'DISPOSITIONS','onchange="getAllDisposition('||seq_id||')"','YES','0',' -- Select Favorite -- ','f08_'||seq_id,'') Disposition,
apex_item.select_list_from_LOV(9,c009,'GEARS','style="background-color:#FBEC5D; "onFocus="checkGearPreviousFocus('||seq_id||');"onchange="getAllGears('||seq_id||')"','YES','3333','-- Select Favorite --','f09_'||seq_id,'') Gear,
apex_item.text(10,TO_NUMBER(c010),5,null, 'onchange="setTotal('||seq_id||')"','f10_'||seq_id,'') Quantity,
apex_item.text(11,TO_NUMBER(c011),5,null,'onchange="getPriceBoundaries('||seq_id||')"','f11_'||seq_id,'') Price,
apex_item.text(12, TO_NUMBER(c012),5,null, 'onchange="changePrice
('||seq_id||')" onKeyDown="selectDollarsFocus('||seq_id||',event);"','f12_'||seq_id,'') Dollars,
decode(c013,'Y',apex_item.text(14, c014,30,null,'style="background-color:#FBEC5D;" onClick="onFocusAreaFished('||seq_id||');"','f14_'||seq_id,''),'N','N/A') Area_Fished,
decode(c017,'Y',apex_item.text(18, c018,4,null,'style="background-color:#FBEC5D; "onBlur="setUnitQuantity('||seq_id||')"','f18_'||seq_id,''),'N','N/A') UNIT_QUANTITY,
decode(c017,'Y',apex_item.text(19,'CN',3,null,'readOnly=readOnly;','f19_'||seq_id,''),'N','N/A') UNIT_COUNT,
c024 hms_flag,
decode(c050,'Y',apex_item.checkbox(21,'Y','id="f21_'||seq_id||'" style="background-color:#FBEC5D; " onClick="alterYes('||seq_id||');" onKeyPress="alterYes('||seq_id||');"',c021),'N','N/A') FinsAttached,
decode(c050,'Y',apex_item.checkbox(22,'N','id="f22_'||seq_id||'" style="background-color:#FBEC5D;" onClick="alterNo('||seq_id||');" onKeyPress="alterNo('||seq_id||');"',c022),'N','N/A') FinsNotAttached,
decode(c050,'Y',apex_item.checkbox(23,'U','id="f23_'||seq_id||'" style="background-color:#FBEC5D;" onClick="alterUnk('||seq_id||');" onKeyPress="alterUnk('||seq_id||');"',c023),'N','N/A') FinsUnknown,
decode(c050,'Y',apex_item.textarea(28,c028,3,null,null,'f28_'||seq_id,''),'N','N/A') Explanation,
decode(c024,'N',apex_item.select_list_from_LOV(29,c029,'HMSNATURE','onchange="saveNature('||seq_id||')"','YES','A','-- Select Nature of Sale --','f29_'||seq_id,''),'U',apex_item.select_list_from_LOV(29,c029,'HMSNATURE','onchange="saveNature('||seq_id||')"','YES','A','-- Select Nature of Sale --','f29_'||seq_id,''),'Y','N/A') Nature_Of_Sale,
decode(c020,'Y',
apex_item.select_list_from_LOV(40,c040,'HMS_AREA_CODE','style="background-color:#FBEC5D;"',null,null,null,'f40_'||seq_id,''),
'N','N/A') HMS_AREA_CODE,
c020,c050,
decode(c020,'Y',
apex_item.text(41,TO_NUMBER(c041),5,null,null,'f41_'||seq_id,''),
'N','N/A') Sale_Price
from apex_collections
where collection_name = 'SPECIES_COLLECTION' order by seq_id
I have noticed the following:
when I change column C011 (price) the following values are set in the dynamic action:
P110_ID = f11_1
P110_VALUE = whatever I change the price to.
when I change the column C024 (hms_flag), the following values are set:
P110_ID = f03_0001
P110_VALUE = whatever I change hms_flag to.
the region is refreshed in my dynamic action, and the change for hms_flag does not hold. I have tested the SQL query that generates the value for v_SEQ in the dynamic action.   In both a change to price and HMS_FLAG it appears valid
select ltrim(substr(:p110_ID,5,4),'0') into v_seq from dual;
if f11_1, v_seq:= 1
if f03_0001, v_seq := 1
thank you!

solved. sort of.
field c024 references f03.
the Dynamic ACtion, step 4 calculates v_member by taking a substring of P110_ID...and in all other fields, the column and the field (fxx) are the same value....except for c024.
I am not certain exactly how to resolve, but see the problem.

How to fetch the value of tabular form item in javascript

Hello all
I want to do some calculations on the value entered by the user in the textfield of a tabular form, how can I fetch the value of tabular form item in the javascript?
I am using normal tabular form, not using apex_item tabular form.
I can pass the current textfield value to the function using "this" as a parameter, but how can I fetch the value of other rows of that same column?
Thanks
Tauceef

Hi Alistair
jQuery is still not working, but I got it done through some other means, this is the code:
function total(pThis){
var l_Row = html_CascadeUpTill(pThis,'TR');
var l_Table = l_Row.parentNode;
var l_Row_next = l_Row;
var n_rows = l_Table.rows;
var lInputs;
var v1;
var sum = 0.0;
var temp;
var i = 0;
var j = 0;
//alert(n_rows.length);
while(j < (n_rows.length - 1))
temp = 0;
if(l_Row_next != null){
lInputs = html_Return_Form_Items(l_Row_next,'TEXT');
v1 = lInputs[0].value;
//alert(v1);
sum = parseFloat(sum) + parseFloat(v1);
l_Row_next = l_Row_next.nextSibling;
temp = 1;
if(temp == 0){
l_Row_next = l_Table.getElementsByTagName('TR')[1];
lInputs = html_Return_Form_Items(l_Row_next,'TEXT');
v1 = lInputs[0].value;
sum = parseFloat(sum) + parseFloat(v1);
l_Row_next = l_Row_next.nextSibling;
j= j+1;
$x('P78_TOTAL').value= parseFloat(sum);
I am calling this function onblur event of the textfield.
Still I am having one problem, I want to perform this calculation on load of the page also, how can I do that? because while calling onblur of the textfield I can pass that textfield to this function but on onLoad how I will pass the textfield to call this function so that I will be able to get the textfield value in the function?
there may be some rows already existing, so I want the total of the existing rows to be displayed in my P78_TOTAL textfield that is why I need to do this calculation on onLoad of the page.
Thanks
Tauceef
Edited by: Tauceef on Jul 8, 2010 4:57 AM

Dynamic Actions on tabular form items

Has anyone had success with using dynamic actions on a tabular form item?
When I create a dynamic action for the selection type I believe I want to use DOM Object, I am just not sure what ID I then need to put into the DOM Object field.
Any help would be greatly appreciated
Regards
Mark

If you wish to use JavaScript with tabular forms, I suggest looking at APEX_ITEM column types. They allow you to specify the JavaScript array number of any given column in your tabular form and rely on it. Then as you loop through your rows you can positively identify the element.
Example:
Original query:
select colA, colB from myTable;
select apex_item.text(1, colA, 20,20) as myText,
apex_item.select_list_from_lov(2, colB, 'LOV_MYLOV', 0, 'NO') myLookup
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How to make a tabular form readonly based on an item value

Hi everyone,
I am getting there, but I need to make a tabular form read-only based on an item value.
I've copied this from somewhere (thanks) and changed it for my needs and it works great to set the second column of my form
to read only.
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also need to give a static id of Entry Form to the form.
I'll try to understand what this code means exactly one of these days, but now I need to make
the whole tabular form read only based on a text item, :P5_CONTROL.
Grateful for any help on this, in the above format if possible. Greek to me but compact and it works.
Regards.
Leckraj

Hi,
actually, there is no code, just one dynamic action. You may have to change the event which triggers it.
Event: Change
Selection Type:     Items(s)
Item(s): P1_ED
Condition: equal to
Value: D
True Action 1
Action: Disable
Fire On Page Load: yes
Selection Type: jQuery Selector
jQuery Selector: input[id^="f"]
True Action 2
Action: Disable
Fire On Page Load: yes
Selection Type: jQuery Selector
jQuery Selector: input[id="check-all-rows"]
False Action 1
Action: Enable
Fire On Page Load: yes
Selection Type: jQuery Selector
jQuery Selector: input[id^="f"]
False Action 2
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Fire On Page Load: yes
Selection Type: jQuery Selector
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Regards, Garry

Populate Tabular Form Date with Date Sitting on Form itself (i.e. :P#_Date)

Hello,
I have a tabular form with two date fields. I need to populate these date fields with two date fields sitting on the form itself.
The form dates are ":P#_Start_Week" and ":P#_End_Week". These dates can change, based on the user entering the data.
I then need to move these dates into the tabular form dates for update to a table, when the user clicks the save button on the tabular form entry. I can't seem to figure out how to make this happen.
On the tabular form element I select Default Type PL/SQL or Function
Default - sysdate
This works fine, but trying to use item(application or page item name) with the form field date name does not. I'm still really new to the APEX world, so any help would be greatly appreciated.
Thanks,
Elaine

Thanks to all who were in the process of getting ready to help.
I found my answer in the threads, after reading many.
Here is the answer:
Re: Default a date in a tabular form
Posted: Apr 14, 2006 3:34 AM in response to: MikeSolis Reply
Sorry, didn't realize you are using a tabular form,try this instead :-
Make the default type as "PL/sql source or function" and the default as "to_date(:F586_TODAYDATE)"..shown below. I made sure my computation which sets the application item returns a date.
Display as - Text field
Default Type :PL/SQL Expression or Function
Default :to_date(:F586_TODAYDATE)
Reference Table Owner - TEST_SCHEMA
Reference Table Name -EMP
Reference Column Name -HIREDATE
HTH
Vishal
I can't believe this post is from 2006. Wow! Thanks Vishal!

How to populate another page item based on cascading select lists?

Oracle 10gXE
APEX 3.2
I've created cascading select lists based on the examples (using Javascript and AJAX) that i've seen on this forum. Thanks for help on that!
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DECLARE
l_param VARCHAR2(2000);
BEGIN
l_param := '&REPORTS_URL.&report=&P26_RPT_VIEW..rdf&desformat=&P26_DESFORMAT.&destype=cache';
IF REPLACE(:P26_OLO_CODE,'%'||'null%',NULL) IS NOT NULL THEN
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END IF;
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END IF;
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l_param := l_param||'&p_org_code=&P26_ORG_CODE_2.';
END IF;
IF REPLACE(:P26_FLAIR_ORG_2,'%'||'null%',NULL) IS NOT NULL THEN
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END IF;
IF REPLACE(:P26_BUDGET_ENTITY_2,'%'||'null%',NULL) IS NOT NULL THEN
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Andy,
This is a great suggestion! After I posted, I started looking at a Javascript solution and figured it's probably what I had to do.
However, now the cascading select list no longer working for some reason after I added the function to concatenate the item values. When I remove the showReport() function the select list works again.
Here is what I have in the HTML Header portion of the page:
<script language="JavaScript" type="text/javascript">
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w = open(url,"winLov","resizable=1,width=800,height=600");
if (w.opener == null)
w.opener = self;
w.focus();
function showReport()
var l_param = '&REPORTS_URL.&report=' + $v('P26_RPT_VIEW') + '.rdf&desformat=' + $v('P26_DESFORMAT') + '&destype=cache';
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if ($v('P26_ORG_CODE_3' != '')
   l_param += '&p_org_code=' + $v('P26_ORG_CODE_3');
popupURL(l_param);
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get = null;
function appendToSelect(pSelect, pValue, pContent) {
var l_Opt = document.createElement("option");
l_Opt.value = pValue;
if(document.all){
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l_Opt.innerText = pContent;
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Hi
Using APEX 4.2 on 11g
In a tabular form I want to filter the values in a Popup Key LOV based on the value of another column (same row).
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e.g. where COL 2 is a popup LOV
COL 1
COL 2
1
LOV SQL: SELECT a FROM b WHERE c = <value from COL 1>
2
LOV SQL: SELECT a FROM b WHERE c = <value from COL 1>
3
LOV SQL: SELECT a FROM b WHERE c = <value from COL 1>
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Setting default value of Tabular form item is not working

Hi,
I have a tabular form and in that I want to set the default value of the username to app_user. So in the default value of the item, I wrote v('app_user') and type Pl/SQL, but that does not seem to work. I tried the static application & page item with :app_user. That threw an error.
Also, I wanted to populate the date field in one column. Doesn't sysdate work?
Thanks,
Sun

Bob, I did read that. MY problem is that it is still not working. I am wondering if this is because the table is in execute query mode maybe? I am wondering if the default value needs to be added after the tabular data is populated through some other way? Maybe the default value would work only for static non database items?
ThanksYou're right, I just tested that using the default setup on the column in report attributes and it did not work.
I think you'll have to update the columns with the default value post query but I'm not sure exactly what you need to do.
I have a form that has a weight entry column. I tried changing the query to set the default value in the query
from..
Select Weight
From...
to
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Excuse my incorrect assumption when first replying.

Page process throwing No data found error when deleting tabular form item

Hi guys,
I am trying to run a page process just before the Tabular form's MRU process and it's throwing a no data found error. Here is my code:
BEGIN
     for i in 1..apex_application.g_f02.count LOOP
          IF apex_application.g_f01(i) is not null THEN
               UPDATE STOCK
                    SET PRODUCT_QUANTITY = PRODUCT_QUANTITY+apex_application.g_f08(i)
               WHERE site_id = :P21_SITE_ID and product_id = apex_application.g_f02(i);
               COMMIT;
          END IF;
     END LOOP;
END;Here f01 is the checkbox column and the if-statement is causing the problem because if I get rid of the update statement (leaving just the commit) then it still throws the error.
When I click on a checkbox and hit delete button which fires off both this process and then MRU I get the no data found error.
Would be grateful if someone could shed some light on this. Many thanks.
Edited by: taepodong on Jul 1, 2012 7:54 AM

Hi,
>
I am trying to run a page process just before the Tabular form's MRU process and it's throwing a no data found error. Here is my code:
BEGIN
     for i in 1..apex_application.g_f02.count LOOP
          IF apex_application.g_f01(i) is not null THEN
               UPDATE STOCK
                    SET PRODUCT_QUANTITY = PRODUCT_QUANTITY+apex_application.g_f08(i)
               WHERE site_id = :P21_SITE_ID and product_id = apex_application.g_f02(i);
               COMMIT;
          END IF;
     END LOOP;
END;Here f01 is the checkbox column and the if-statement is causing the problem because if I get rid of the update statement (leaving just the commit) then it still throws the error.
When I click on a checkbox and hit delete button which fires off both this process and then MRU I get the no data found error.
>
You are iterating on the f02 and checking for f01 not null. That is wrong usage of the the checkbox item. Please see these links . especially the OnSubmit Process examples.
http://docs.oracle.com/cd/E23903_01/doc/doc.41/e21676/apex_item.htm#CHDDCHAF
http://docs.oracle.com/cd/E23903_01/doc/doc.41/e21676/apex_app.htm#AEAPI215
Regards,
PS : This is what you need to understand
>
<b>Note that check boxes displayed using APEX_ITEM.CHECKBOX will only contain values in the APEX_APPLICATION arrays for those rows which are checked. Unlike other items (TEXT, TEXTAREA, and DATE_POPUP) which can contain an entry in the corresponding APEX_APPLICATION array for every row submitted, a check box will only have an entry in the APEX_APPLICATION array if it is selected.</b>
>
Edited by: Prabodh on Jul 2, 2012 9:44 AM

Manual Tabular Form - Items not rendered

Hi,
i'm trying to build a manual tabular form:
I added a blnak page with a Report Region using a SQL Query in a Classic Report:
select apex_item.text(1,"EMPNO") as "EMPNO",
apex_item.text(2,"ENAME") as "ENAME",
apex_item.text(3,"JOB") as "JOB",
apex_item.text(4,"MGR") as "MGR",
apex_item.text(5,"HIREDATE") as "HIREDATE"
from "EMP" "EMP"The items are not rendered in the report, but the HTML Text is displayed instead.
See http://tinypic.com/r/2e6bqdu/5
I played around with "Display As" in the Column Attributes - no luck.
I used this links as reference:
http://apex.oracle.com/pls/otn/f?p=31517:170:2228543603318893:::::
http://www.oracle.com/technetwork/developer-tools/apex/tabular-form-090805.html (To build a tabular form manually:)
http://apexjscss.blogspot.com/2010/05/manual-tabular-form.html
Am i missing something ?
APEX 4.1 on 11gr2
regards,
gw

The "Display As" for each column should be "Standard Report Column".
Seems the default "Display as" for standard reports has changed:
I created your standard report in a 3.2 environment and the report defaulted the "Display As" for each column to "Standard Report Column".
I created your standard report in my own 4.0 environment and in the hosted apex.oracle.com environment and the report defaulted the "Display As" for each column to "Display as Text (escape special characters, does not save state)"

Populate a text filed based on LOV selection with AJAX

Good day,
I would like to populate a text box based on selection from a LOV. If someone selects a LOV value and then tabs off off of that element, I would like
the text box populated from a sql statement based on the LOV value in the predicate.
Application Express 4.1.1.00.23
Thanks for any guidance.
Steve

Hi Steve,
You can do that with an dynamic action which triggers on a "onchange" from the LOV.
Regards,
Kees Vlek
<tt>Company: http://www.orcado.nl
Blog: http://www.orcado.nl/blog/blogger/listings/69-kvlek
Twitter: http://www.twitter.com/skier66</tt>
If the question is answered please change it to answered and mark the appropriate post as correct/helpfull.

Default on tabular form item

Hi,
I saw that you can choose the default types:
- no default
- item (application or page item name)
- PL/SQL Expression or function
The next field is the default value I assume. I selected item and referred to an item on the same page with :P27_ITEM_NAME or &P27_ITEM_NAME.
Both do not work, can you help me with this, since I probably have the syntax wrong then.
My goal is to have a default value already displayed when I press add row.
Thanks,
Patrick

Hi,
I tried the same. My page item stored a number so I chose "PL/SQL Expression or Function" for default type.
And in the default field I entered: to_number(:P9018_model_id)
Regards,
Denise

Disabling Popup LOV (named LOV) cell in my tabular form

Hello.
I have a tabular form.
I have a column where I insert values based on the named list of values. I make the field of "Popup LOV (named LOV)" type. However, ApEx allows the values to be either picked from the popup list or entered manually into the field's text field. I want to prevent the user from being able to manuall enter the values into the field and force the use of the popup LOV.
I know that selecting Popup LOVs for regular items in a region make the text field "disabled" disallowing direct entering of values. However, for tabular forms' fields, this does not seem to be the case.
Is there a style I can add to the attribute to make this happen?
thanks
Boris

Hi Boris,
I'm glad that you are learning things through this forum!
You can't validate tabular form items using the normal Item Level validation - as this is for page item names only (that is, P1_EMPNO for example).
You can do validation using PL/SQL in a Page Level Validation. There are a number of examples on how to do this on this forum. Here's one by Denes: [http://htmldb.oracle.com/pls/otn/f?p=31517:41]
When you submit a tabular form page, Apex creates collections for each "fnn" set of items. "f01" items are stored in APEX_APPLICATION.G_F01, "f02" items are stored in APEX_APPLICATION.G_F02 and so on. To validate any item, you loop through one collection and check its value or the values in the same position on the other collections.
In Denes's example, he is looping through the "f02" items (that is APEX_APPLICATION.G_F02 from 1 to APEX_APPLICATION.G_F02.COUNT) and checks the values in the "f07" (APEX_APPLICATION.G_F07) and "f08" (APEX_APPLICATION.G_F08) items. The items are stored in their collections in the same order as they appear on the page, the first item in G_F01 is on the same row as the first item in G_F07 and so on. The validation(s) to perform will depend on your requirements.
In the example, Denes is using a "Function Returning Error Text" validation. In these, you either return a string containing the error or NULL (meaning no error has been found).
Andy

Populate tabular form items based on LOV in header

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