Assigning Event Handler (Set Point) output to multiple targets

[Wingnut2.0]

Re: Assigning event handlers

Curious if its also possible to assign the output of an event handler set point to multiple target points via json?

[phildunlap]

Hi Wingnut2.0,

Sort of. It isn't possible using the return value, but you could add the points to context on the handler and do something like,

for ( var varName in CONTEXT_POINTS ) {
  if("source" == varName)
    continue;
  this[varName].set(source.value);
}
return UNCHANGED; //don't set a value to the "target" point here, we already did

And you could change up the context points via JSON (not sure how the JSON portion tied in).

[Wingnut2.0]

Thanks Phillip.

In your response here https://forum.infiniteautomation.com/topic/3282/assigning-event-handlers you mentioned making the change in the JSON to have multiple points reference a single event handler.

"eventTypes":[
            {
               "sourceType":"DATA_POINT",
               "dataPointXID":"DP_1234",
               "detectorXID":"ED_1234"
            }
         ]

I didnt know if the same approach might work by adding multiple target points in the JSON of the event handler

"targetPointId":"DP_pointOne,
"targetPointId":"DP_pointTwo,

[phildunlap]

That enables one to handle multiple event types with the same event handler, not only point event detector event types. There is not a way through the UI to configure that sort of situation yet, but you can import it already and it'll work. It would be many-events-to-single-handler instead of single-handler-to-many-points.

Looping over points and using the set() function is the only way to set multiple values from a set point handler. You can still construct the context (which should work automatically with the snippet I shared) through JSON via the "additionalContext" property of the set point handler.