how to pass params from flowscript to the widget

[Мария Григорьева]

Variable in the flowscript: 

 

var composition_id = experiment.get("id_compositions");

 

And the widget:

 

<fd:field id="density" required="true">

                <fd:label>Density</fd:label>

                <fd:datatype base="decimal"/>

                <fd:on-value-changed>

                               <javascript>

                                               var value = this.value;

                               </javascript>

                </fd:on-value-changed>

  </fd:field>

 

I need to pass "composition_id" to the widget's on-value-changed.