[flexcoders] Detecting a variable change

[derekyoussi]

Hey everybody!

I've been trying to figure out how to setup a listener to detect a
change in a variable. For instance, lets pretend we have a custom
component with the code below. The langType variable is bound to
another variable in the main application, and I want it to run the
changeLangTxt function whenever the langType variable changes. How do
I do this?

var langType:String = new String("english");
var helloMsg:String;

private function changeLangTxt():void{
  if(langType == "spanish"){
    helloMsg = "Hola"l
  }
  if(langType == "english"){
    helloMsg = "Hi There"l
  }
}