Update:
my first test seems to work.
I use PMAPPER search tools to select "SOURCE" point then I use a fixed
TARGET point in the sql:
<sql>SELECT seq, id1 AS node, id2 AS edge, cost, the_geom FROM
pgr_dijkstra('SELECT id, source, target, st_length(the_geom) as cost FROM
sentieri.tutti', ~* '^[search], 2, false, false) as di
JOIN sentieri.tutti pt
ON di.id2 = pt.id ;</sql>
in the example SOURCE comes from [search] and TARGET is 2.
it works, it highlights the route! obviously you should use the "network
layer" in mapfile but not add it in config.xml. Let it works in backgroung.
Now I would like to "select" the target point in the same way I did for
"source" point.
The I would like to use more understandable name for source and target. In
this moment they refer to NODE id of my DB created by pgrouting extension.
If someone of you is interested we can develop toghether this function.
it works in pm4 and 5
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