Hello @quangnguyenduc4,
I can suggest four alternatives, all of which are bad, but in different ways:
- Wait for PTC to implement this merging;
- Customize Advanced Grid widget or implement your own grid from scratch;
- Collection widget in "Table" mode might be able to help;
- Create a service returning a table as HTML and render it using HtmlTextArea widget;
- Export data to Excel and group cells on POI level (you'll need to write a custom Java extension for that too);
All of those options (except for (1)) are either just ugly or complex and ugly. Option (4) will probably bring you the highest value in the long-term perspective, but it requires some development. At least, that's what I usually do when the users need some advanced grid operations (grouping, merging, filtering, formatting, etc.) -- then I just say "You will use web interface to preview the data, and you'll be able to click "Export to Excel" to get the actual grid".
Regards,
Constantine