How to call function when assigning an object a value

Question

Hi I the following functions in separate js files

//in js file 1
setUsername: function(v){
document.Load.LogUsername = v;
}
//in js file 2{wrapper for js file 1}
LogUserName: function(v)
{
  return myobject.SetLoguserName(v);
}

When document.Load.LogUsername = v; is called i need it to call the LogUserName function. LogUserName is a wrapper for setUsername. Any ideas how to get this to work. I know if change document.Load.LogUsername = v; to document.Load.LogUsername(v); then it works but i was asked not to change the js file 1

Answer 1

You need to save the original function, like this:

var originalLogUserName = document.Load.LogUsername;
LogUserName: function(v)
{
    return originalLogUserName.call(myobject, v);
}

Answer 2

You need to use a setter. E.g.:

document.Load = 
{
  set LogUsername(v) 
  {
    myobject.SetLoguserName(v);
  }
};