Regarding the query about Calling a method in a directive controller from another controller.
Is there a way to have multiple separate directives of the same type on a page? Since they share a common API (singleton), the state is also shared. Therefore, if I were to include two identical directives, they would both access one instance of the API and thereby have the same state.
It seems like the topic you're referring to is about isolating the scope of a directive. For more information, check out the relevant documentation here. One way to achieve this is by using scope: true, which creates an isolated scope for the directive that inherits properties. Additional details can be found here.
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