addObserver

Syntax

<Path>.addObserver(AttributeName:string, Method:object)

The method addObserver adds an observer to the object designated by <Path>.

Parameters

• The parameter AttributeName of data type string designates the name of the observable attribute or method.

• When the value of this attribute or method changes, Plant Simulation calls the method designated by the parameter of data type object. It then executes the actions, which you programmed in this method.

Example

MyStation.addObserver("occupied", "myMethod")

MyStation.addObserver("occupied", &myMethod)

Within the called Method you can use the anonymous identifiers ? and @ to address the object, whose attribute changed, i.e., the caller of the Method.

Two parameters are passed to the Method, which will be executed:

• The name of the observable attribute or the observable method, whose value changed. This way you can use a single Method as the called Method for several attributes.

• The previous value of the observable attribute or the observable method. This way you can still access the previous value after the Method changed it to the new value.

The Method to be executed might look like this:

param attribute: string, oldValue: any
if ?.occupied
   ?.Cont.move(Station2)
end

Related Topics

Edit Observers

removeObserver

attributeWatchable