Pass parameters to the box of the HTML form to a stored procedure

I'm always looking for a solution to my problem of forms. For the record, I don't use Express applications to create my application - I use PL/SQL right. I need to know how to pass parameters from the box to my Web form. I welcome people select one or more checkboxes in a form that calls a remove function to delete the selected records. What I read in Oracle of the "Guide to the developer of database applications - Fundamentals" is not useful to me. If someone could tell me some examples, maybe I could see what I'm doing wrong. Here is what I wrote in "the developer of database applications - fundamentals Guide ':

All the boxes with the same NAME attribute are a group of checkbox. If none of the boxes in a group is selected, the stored procedure receives a null value for the corresponding parameter.

If a check box in a group is selected, the stored procedure receives a single parameter of VARCHAR2.

If more than one check box in a group is enabled, the stored procedure receives a parameter with the type of PL/SQL TABLE OF VARCHAR2. You must declare a type like this, or use a pre-defined as OWA_UTIL. IDENT_ARR. To retrieve the values, use a loop: 
CREATE OR REPLACE PROCEDURE handle_checkboxes ( checkboxes owa_util.ident_arr )
AS
BEGIN
...
FOR i IN 1..checkboxes.count
LOOP
htp.print('<p>Checkbox value: ' || checkboxes(i));
END LOOP;
...
END;
/
SHOW ERRORS;

I'm not sure that understand what your question is.

If your web form has the following defined all with the same name:

one
two
three

You create and save a procedure to manage the sending of a form that contains a parameter with the name of attrib type owa_util.ident_arr for example:

create or replace procedure handle_form(attrib owa_util.ident_arr) as
  iter number;
begin
  for iter in attrib.first .. attrib.last loop
    -- do something with attrib(iter)
  end loop;
end;
/

Now, the only problem with this Manager (or any other), is that if the user selects any of the boxes, or no value for the parameters expected, the Manager called with parameters missing or with on all of the passed parameters, as well as the call will error.

To move, you need to provide default values for all parameters passed to your handler such as the settings of ident_arr, but with ident_arr settings, it's hard to do with autonomous procedures. If you place your procedure in a package you can define variables of package-level of the appropriate types that can be used as default values:

create or replace package my_web as
  empty_arr owa_util.ident_arr;

  procedure handle_form(attrib owa_util.ident_arr := empty_arr);
end my_web;
/
create or replace package body my_web as
  procedure handle_form(attrib owa_util.ident_arr := empty_arr) as
    iter number;
  begin
    for iter in attrib.first .. attrib.last loop
      -- do something with attrib(iter)
    end loop;
  end;
end my_web;
/

now, when you hit in the situation where the user does not select the checkboxes, the call to handle_form will be no reviewable error on due to missing parameters, and the empty_arr will not have all the elements to iterate over so the loop in the body of the procedure will be fine and you will be able to retrieve each value of the checkbox selected attrib table when you iterate on it.

Tags: Database

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