Read return value from Ruby's add_action_callback in Javascript always undefined

Hi,

I face problem when I try to get return value from an action callback and the value that is read by Javascript is always undefined. I already read some posts that discuss the same issues like here and here and also read docs about add_action_callback but unfortunately I failed to implement it to my code.

Here is my code in Ruby side:

# add callback to calculate QTO
@dlg.add_action_callback("calculate") { |action_context|
     self.export_qto()
}

def self.export_qto()
     # grab active model
     model = Sketchup.active_model
     # initiate selected entities total volume
     message = "Volume of all selected entities: \n"
     vol = 0.0
     # select entities
     selected = model.selection
     if (selected.length > 0)
           selected.each { |item|
               if (item.typename == 'Group')
                   if (item.volume != -1)
                       vol = vol + item.volume
                       message = message + item.definition.name + '(' + item.typename + ')' + ': ' + format_volume_in_model_units(item.volume, 2) + "\n"
                   end
               end
           }
           puts message
           message
      else
           UI.messagebox('No entities selected. Select entities and try again!', type=MB_OK)
      end
end

And here is my code in Javascript side:

function calculate() {
       let hasil = []
       let result = sketchup.calculate({
           onCompleted: function (data) {
               console.log(data)
               hasil.push(data)
           }
       })
       if (result) {
           document.getElementById('hasilhitungan').innerHTML = hasil[0];
           console.log('Hasil: ', hasil[0]);
       }
}

However the resulting value is always undefined.

Do I have to always use execute_script on the Ruby side to be able to send the return value back to Javascript? Or I could still use this approach instead?

Thanks… really appreciate your helps…

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