Auto New Row Generation In Interactive Grid Using Bar-code Reader or Manual Input

1. Create a page and a region type Interactive Grid form from a table.
  (using where 1=2 for showing empty grid).

2. Now create a Dynamic action with Change Event and Execute javaScript Action
on column, from where new row will create.

3. Then goto Region Properties Advanced>> Static ID >> type a id like: REG_ID

4.Use below JavaScript for create new from Upper side new row.

apex.region("REG_ID").widget().interactiveGrid("getActions").invoke("row-add-row")
OR

apex.region("REG_ID").widget().interactiveGrid("getActions").invoke("insert-record")
 (for down side new row)

(After making interactive grid if there any primary key problem then go to a primary key column>>
Sours>>Primary Key>>Yes)