In a dynamic page how to share variable between PL/SQL and javascript

Question

For example, my dynamic page contains such PL/SQL codes:
<ORACLE>
DECLARE
info varchar(100);
rowid urowid;
procedure doDelete(
row_id in urowid
) IS
begin
Delete From xxx
WHERE rowid = row_id;
end doDelete;
BEGIN
Select name, rowid INTO info, rowid
From xxx Where xxx;
HTP.PRN(' <INPUT TYPE="button" VALUE="show value" onClick="alert(info);">');
HTP.PRN(' <INPUT TYPE="button" VALUE="delete" onClick="doDelete(_row_id);">');
END;
</ORACLE>
The variable 'info' and '_row_id' are correct, however the two HTP. sentence do not work. What's the problem?
What I want to do is to show all the records in TABLE A in a page. And at the end of each line (record), there' re a 'delete' and a 'update' button to let user operate on this record. Is this possible? I know form can do delete an update, but it can not show all the records in a page like what report does. Besides dynamic page, is there any other better choice? Report can do it?
One more question. In a report, I employed link on one field to a second report. It works well. But I want to open the second report in a new window when the link is click. Is this possible?
I was almost driven crazy by these :( I so appreciate if anyone can help.

Answer 1

The code written by you is insufficient for the funtionality you are trying to achieve. Below is a method to achieve the same.
Note: Used standard scott.emp table for the example which is located in my db provider schema.
Do the below modifications as per your local configuration
xxxxx -> Replace it with your Portal schema
yyyyy -> Replace it with your db provider schema
<<module_id_of_form>> -> Replace with the module id of form created in step 1 & 2.
First and foremost... oracle does not allows variables starting with '_'. So if you want to use it you have to place it in double quotes ("")
rowid -> illegal
"_row_id" -> legal.
However, I will advice you not to use variable names starting with "_".
Now lets get started...
1. Create a form on the table you are using in the dynamic page. Just have the update button. Remove the other buttons.
2. Get the module id of this form. Instruction for getting the module id:
a) Right-click on the form's run link and copy the shortcut
b) Get the value of p_moduleid parameter. This is your module id.
3. Create a procedure "save_action_details" in your db provider schema. This procedure will accomplish the delete operation on the record.
     CREATE OR REPLACE Procedure save_action_details(
     p_rowid IN VARCHAR2,
     p_action IN VARCHAR2,
     p_dyn_ref_path IN VARCHAR2,
     p_dyn_page_url IN VARCHAR2)
     is
     l_sto_session xxxxx.wwsto_api_session;
     begin
     l_sto_session := xxxxx.wwsto_api_session.load_session(
     p_domain => 'DynStore',
     p_sub_domain => 'DynStore_' || p_dyn_ref_path
     l_sto_session.set_attribute(
     p_name => 'rowid',
     p_value => p_rowid
     l_sto_session.set_attribute(
     p_name => 'action',
     p_value => p_action
     l_sto_session.save_session;
     htp.init;
     owa_util.redirect_url(p_dyn_page_url);
     end save_action_details;
Explaination: The above procedure creates a session and keeps the rowid and action in the session. This information is used by the below dynamic form to perform the necessary action. In our exampl, the action is always going to be delete so you may go ahead and hard code it, else leave it as it is.
4. Grant execute privilege on the procedure "save_action_details" to public.
sql> grant execute on save_action_details to public;
5. Create your Dynamic page.
a) In HTML code section have the below code. This code shows some columns from the table and "update" and "delete" buttons to perform the respective action.
     <ORACLE>select empno,ename,rowid,
     '<input type="button" value="Update" onClick="doAction(this.form,''UPD'',''xxx'','''
     || xxxxx.wwv_standard_util.url_encode(rowid) || '''); tWin();">
     <input type="button" value="delete" onclick="doAction(this.form,''DEL'',''' || rowid || ''',''xxx'');">' Action
     from yyyyy.emp</ORACLE>
b) In additional pl/sql code section of dynamic page, have the below pl/sql block "in after displaying the header" section.
     declare
     l_sto_session xxxxx.wwsto_api_session;
     l_del_rowid varchar2(20);
     l_action varchar2(10);
     begin
     htp.comment('User code starts here ...');
     htp.p('<script>');
     htp.p('var winHandle;');
     htp.p('
     function doAction(formObj, action, rowid, erowid)
          if (action == "UPD")
          var formURL = "' || xxxxx.wwctx_api.get_proc_path('wwa_app_module.link?p_arg_names=_moduleid&p_arg_values=<<module_id_of_form>>&p_arg_names=_rowid&p_arg_values=') || '" + erowid;
          winHandle = window.open(formURL, "winDynUpd", "width=750,height=500,resizable=yes");
          else
          formObj.p_rowid.value = rowid;
          formObj.p_action.value = action;
          formObj.submit();
     function tWin() {
          if (winHandle.closed) {
          document.location = document.location;
          else {
          setTimeout("tWin()", 500);
     htp.p('</script>');
     htp.p('<form name="dynRowProcess" method="POST" action="'
     || xxxxx.wwctx_api.get_proc_path('save_action_details','yyyyy')
     || '">');
     htp.p('<input type="hidden" name="p_rowid">');
     htp.p('<input type="hidden" name="p_action">');
     htp.p('<input type="hidden" name="p_dyn_ref_path" value="' || p_reference_path || '">');
     htp.p('<input type="hidden" name="p_dyn_page_url" value="' || p_page_url || '">');
     l_sto_session := xxxxx.wwsto_api_session.load_session(
     p_domain => 'DynStore',
     p_sub_domain => 'DynStore_' || p_reference_path
     l_del_rowid := l_sto_session.get_attribute_as_varchar2('rowid');
     l_action := l_sto_session.get_attribute_as_varchar2('action');
     if l_action = 'DEL' then
     delete from yyyyy.emp
     where rowid = l_del_rowid;
     end if;
     end;
Explaination: The session information (rowid and action) stored by "save_action_details" procedure is retrieved by the dynamic page and is used to delete the record.
6. Once you are through with the above steps, test it by placing the above "dynamic page" portlet on a page.
a) When you click on delete button the record gets deleted and the automatically refreshed page will not show the deleted record.
b) On clicking update button, a form will appear. do the necessary modifications in data and click update. the data in the form gets updated. Once you close the form the dynamic page gets refreshed automatically and it will show you the updated information.