topic Re: Row State Handler stops firing after the first selection - how do I keep it persistent? in Discussions

Row State Handler stops firing after the first selection - how do I keep it persistent?

shuey — Tue, 09 Jun 2026 10:46:52 GMT

I'm building linked selection across a set of By-group Bivariate plots. The plots come from a long-format table (one row per ID per Mode):

dt << Bivariate(
      Y( dt:Y ),
      X( dt:X ),
      By( :MODE )
  );

What I want: when I click a point in one of the By-group graphs, I want every point in the other graphs that shares the same :ID to also become selected. I'd like to do this without reshaping the table to wide format (one row per ID).

What I tried: I found that a row state handler can re-select all rows for the matching IDs. My current implementation:

f = Function( {row},
      rows  = dt << Get Selected Rows;
      units = Associative Array( dt:ID[rows] ) << Get Keys;
      dt << Select Where( Contains( units, :ID ) );
);
rs = dt << Make Row State Handler( f );

The problem: this works for the first selection only in the data table. After that the handler behaves as if it no longer exists.

My questions:
1. Why does the row state handler stop firing after the first selection? (I'm wondering whether changing row states inside the handler is what's tearing it down.)
2. Is there a way to fix this so the handler stays active across repeated selections?
3. Are there better approaches to ID-linked selection across By-group plots that I should consider instead?

Thanks in advance.

Re: Row State Handler stops firing after the first selection - how do I keep it persistent?

jthi — Tue, 09 Jun 2026 11:05:00 GMT

You are most likely getting a message to log which kinda tells you what is going on

Loop detected earlier

and sometimes more helpful one

Row State Handler is in a loop

Row States should not be changed by Row State Handler.

Re: Row State Handler stops firing after the first selection - how do I keep it persistent?

shuey — Tue, 09 Jun 2026 11:17:47 GMT

Yes, I'm getting the message

Loop detected earlier

is there a better way to approach this problem?

Re: Row State Handler stops firing after the first selection - how do I keep it persistent?

jthi — Tue, 09 Jun 2026 17:38:31 GMT

No good ideas quickly come to my mind when using bivariate + by + stacked data table.

Using split (wide) format table would be the best option. If you can use Graph Builder for the plot, it can be used with a formula to do something like this using overlay/color (it won't select the rows).