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Oracle Tips by Burleson 

Working with Multiple Select Lists

When a page is submitted, the value of a Multiple Select List page item will become a list of values separated by colons.  For example, in Figure 10.25, the Blue, Green and Red values have been chosen.  The page item will be set to the value B:G:R since those are the corresponding results from the LOV. 

There are three ways to now process the value in the page item. 

1.       The string can be kept as a colon-delimited string and stored in the database.

2.       The INSTR function can be used to process the information.

--  Search to see if Blue is part of the string
if instr(:P1_MLIST,'B') > 0 then
  -- process Blue
  If instr(:P1_MLIST,'R') > 0 then
   -- process Red
end if;

3.       The list can be processed by utilizing the HTML DB API function called HTMLDB_UTIL.STRING_TO_TABLE.  This function takes the result string and turns it into a PL/SQL array.  The array can be processed in any manner.  The following is an example of use:

  selected_items htmldb_application_global.vc_arr2;
  -- convert the colon separated string of values into
  -- a pl/sql array
  selected_items := htmldb_util.string_to_table( :P1_MLIST
  -- loop over array to insert items into a table
  for i in 1..selected_items.count
    insert into colors_table
    values ( selected_items(i) );
  end loop;

The reverse of this PL/SQL code can be performed in order to reassemble the value for the page item. 

  selected_list  htmldb_application_global.vc_arr2;  i          integer := 1;
  for r in( select color
        from  color_table ) loop
    selected_list(i) := r.class_id;
    i := i + 1;
  end loop;

  :P1_MLIST := htmldb_util.table_to_string( selected_list,
':' );

The above book excerpt is from:

Easy HTML-DB Oracle Application Express

Create Dynamic Web Pages with OAE

ISBN 0-9761573-1-4   

Michael Cunningham & Kent Crotty


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