Oracle APEX - How to populate interactive grid using APEX collection - oracle-apex

Question

I am new to developing application using oracle apex. Please excuse me if this question seems very trivial in nature.
In a nutshell, I am trying to invoke a REST service programmatically to populate an interactive grid on oracle apex page. Here's what I already tried.
Created a page that has a button to invoke a process.
The process invokes a REST service to get all order lines belonging to a particular order. The sample response from the REST service is as below
{
"items": [{
"HeaderId": 300100550016803,
"FulfillLineId": 300100550016806,
"SourceTransactionLineId": "1",
"SourceTransactionLineNumber": "1",
"OrderedQuantity": "10",
"OrderedUOM": "Each",
"RequestedFulfillmentOrg": "Vision Corporation"
},{
"HeaderId": 300100550016803,
"FulfillLineId": 300100550016807,
"SourceTransactionLineId": "2",
"SourceTransactionLineNumber": "2",
"OrderedQuantity": "15",
"OrderedUOM": "Each",
"RequestedFulfillmentOrg": "Seattle Manufacturing"
}]
}
If the rest service invocation was successful (http status code: 200), then I create the apex_collection as below in the same process. Also, I have set one of the page fields (P3_REFRESH_ORDER_LINES_GRID) to ‘Y'. On page load, the value for this attribute must be null.
if apex_web_service.g_status_code = 200 then --OK
dbms_output.put_line( 'Response : ' || l_data ); --if response was OK, print it
apex_collection.create_or_truncate_collection( 'OrderLines' );
apex_collection.add_member(
p_collection_name => 'OrderLines',
p_clob001 => l_data );
:P3_REFRESH_ORDER_LINES_GRID := 'Y';
end if;
I have then used the below SQL query to populate data into the interactive grid
Set the region type to “Interactive Grid”
Source: Local Database
Type: SQL query
SELECT ol.fulfill_line_id as FulfillLineId, ol.quantity as Quantity
FROM APEX_collections c,
JSON_TABLE(
c.clob001, -- the following lines depend on your JSON structure
'$.items[*]'
columns(
fulfill_line_id number path '$.FulfillLineId',
quantity number path '$.OrderedQuantity')
) ol
WHERE c.collection_name = 'OrderLines';
Then, I have setup a dynamic action on the page item (Its a hidden text field)
- P3_REFRESH_ORDER_LINES_GRID
- Dynamic Action name : RefreshGrid
- When: Event Name: Change
- selection type: Item
- Item - P3_REFRESH_ORDER_LINES_GRID
- Client side condition - Type: Item is not null
- Item - P3_REFRESH_ORDER_LINES_GRID
- True condition: Action: Refresh, selection type: Region, Region: Order Lines (Name of the region containing the IG)
After I click on the button to invoke the rest service to fetch the order lines, the interactive grid does not display any data. Can you suggest where am I going wrong here?

Answer 1

Potential Issue(s)
Step 1 You didn't really specify how your button works. If it is submitting the page, you may have problems with P3_REFRESH_ORDER_LINES_GRID field remaining null.
You could have Server-Side conditions preventing the invocation or on Page-Load you may be resetting P3_REFRESH_ORDER_LINES_GRID to null, and Step 5 will NOT trigger.
Step 3(Most Likely Issue) If you are not submitting the page, and you just have a Dynamic Action, executing Server-Side code: you may have forgotten to include P3_REFRESH_ORDER_LINES_GRID in the Items to Return.
Your P3_REFRESH_ORDER_LINES_GRID flag will remain null and Step 5 will NOT trigger.
To Debug
You can try debugging your page here by checking Session under Developer Tools. I would make sure each step work and executes however I intend it to execute.
Also leverage APEX_DEBUG in my PL/SQL
Open your Browser's Developer Tools and look under Console. You should see Dynamic Action Fired lines there if Step 5 is being triggered at all!
As you have not shared how your debugging went, and other observations after clicking the button, such as:
Was the collection created?
Is there data in the collection?
What's the value of P3_REFRESH_ORDER_LINES_GRID
You should be able to see what the answers are for the above using Session.