Dynamic action to execute PL/SQL that calls a JavaScript alert - does not

Greetings,

I'm stuck! I use the Apex Version 4.2.2. I have a requirement that, when the user fills Field1, I check the database to see if the value of field1 has already been used. If it was used, I have to inform the user, but the user is allowed to reuse the value - that is to say, duplicates are allowed. My thought is to use a dynamic action to check the onchange of value running pl/sql to check (via a function in the database) and if it returns true, use a javascript alert to inform my user value is used. They can then close the alert and change (or not change) the duplicate value

I did the following:

1 wrote a PL/SQL function in my utility package in the database - we'll call it apps.my_utils.check_value_use (p_my_val in varchar2) return Boolean - it works.

2. created a dynamic Action with the following properties for P1_FIELD1:

Event: change

Selection type: item (s)

Product (s): P1_FIELD1

Condition: is not null

3. the dynamic Action has an action - real Action

Action: Execute the PL/SQL Code

Page items to submit: P1_FIELD1

PL/SQL code:

BEGIN

IF apps.my_utils.check_value_use(:P1_FIELD1) = TRUE THEN

HTP.p ("< script type =" text/javascript "> '");

HTP.p ("alert (" this value is used ""); ")

');

HTP.p ("< /script >" ");

END IF;

END;

When I run the page and fill in Field1 with a value that I know is in use, I get the following error:

Error: parsererror - SyntaxError: JSON.parse: unexpected character

Help, please. I already spent too much time on this apparently simple requirement.

Thank you

BEGIN

IF apps.my_utils.check_value_use(:P1_FIELD1) = TRUE THEN

HTP.p(' ');

END IF;

END;

Avoid doing this. Try the following method:

(1) create a dummy hidden element to store the result of your validation of PL/SQL. Lets call it P1_DA_ERR

(2) in your PL/SQL block put this point hidden in the field "Page point back.

(3) in your PL/SQL block placed the result of your validation in this element hidden as

DECLARE
l_err PLS_INTEGER := 0;
BEGIN
-- An example
IF 1=1 THEN
l_err := 0;
ELSE
l_err := 1;
end if;
:P1_DA_ERR := l_err;
END;

(4) add a true other "Run Javascript code" type action. The could should look like:

if(parseFloat($v('P1_DA_ERR'))==1)
{
alert('Error occurred');
}

Tags: Database

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