Java EE (Java Enterprise Edition) General Discussion

Issue:
This issue is with the following, I want a table to display with Parent and Child (Table Rows) that, when a + sign is clicked in Parent Row, the rows expand to show child rows, and the + sign is changed to a -.

Now - sign is clicked , the rows collapse to hide child rows, and - sign is changed to a +. At that time, parent row is displayed with blank space between two rows.

Child rows are hiddedn by using style (display:none) and javascript

Note:Parent Row and child rows are having Rowspan details also.

My issue is blank space is added every time when i collapse the row (when hiding child row)

Please help me with this issue.(very urgent)

Thank you