Grid row cell span

How to making grid row cell sapan while using load from external?

Unfortunately it is not available to define the spans structure in the grid data.
You can only use the grid config

or the addSpan() method:

not in the structure but if load from external, this is the example DHTMLX Snippet Tool

As I’ve said before

Unfortunately it is not available to define the spans structure in the grid data.

I have the same issue.
A grid with months, I hope the adjacent columns be merged if the value identical.
I have a workaround for ur reference. Below code is called right after the grid data loaded.

However, I found the grid column template/tooltiptempate not work properly in such a situation.

Could you please, provide a complete demo, or a code snippet, where the problem can be reconstructed locally?