Based on my expertise, the following are the criteria for making decisions:
- When there is a change in Controller Scope Data -(One direction)-> Directive Scope Data Change: Inherited scope should be used. Scope : True
- When there is a change in Controller Scope Data<-(Both directions)->Directive Scope Data Change: Parent scope should be used. Scope : False
- When there is no data change between Controller Scope and Directive Scope: A new isolated scope should be used. Scope : { }
For instance, if we have functionality like:
{Username} text box (Outside Directive) and
Hello {Name} (inside directive, displayed after the {Username} text box).
- If changing {Username} reflects changes in {Name}, then use 1.
- If changing {Name} or {Username} affects each other, then use 2.
- If there is no correlation between {Name} and {Username}, then use 3.
Although we can utilize an isolated scope (@,=,&) to pass data between scopes, this method is considered the optimal approach based on my understanding.