Listener has no knowledge of what property it is registered for

[erotavlas]

The listener that is passed to observe(listener, options) is a function that is provided two values, 'newvalue' and 'oldvalue when the property it was registered for in the model was changed. However once inside the listener function, there is no way to know what property these values correspond to.

For example say you are trying to set up all your observers dynamically like this in a for loop

                    widget.observeHandles[property] = widget.propertyObjects[property].observe(
         
                        function (newValue, oldValue) {
                            
                            console.log(property + " old value: " + oldValue);
                            console.log(property + " new value: " + newValue);

                            that.properties[property] = newValue;
                            that.propertyFunctions[property](newValue);
                        },
                        {
                            onlyFutureUpdates: onlyFutureUpdatesFlag
                        }

                    );

Once inside the function there is no knowledge of the property change which activated this function call, therefore you cannot run any code that depends on the name of that property.

Can this be added as a third parameter to the listener - like function(newValue, oldValue, property)?

[dylans]

@erotavlas this seems like a reasonable suggestion. Would you be interested in creating a pull request to add the third parameter?

[erotavlas]

Ok I'd be willing to do it, but I already tried modifying Model.js on my own without success.