Is there a way to trigger a function inside a directive whenever the parent scope undergoes a state change?
One common approach is to utilize event broadcasts ($broadcast) and listeners ($on).
I'm curious whether using a $watch could serve as an alternative to event broadcasting. If so, how do they compare in terms of functionality?
From my understanding, the expression being monitored is assessed during each $digest cycle. Does this mean that events are more efficient than watches?
The $watch function monitors variables within the scope, allowing for inheritance from parent scopes as well. This is a recommended approach for your scenario because it provides flexibility and ease of monitoring.
On the other hand, $on is utilized for event tracking, enabling you to broadcast events to child scopes or emit them to parent scopes. While this offers more control, it also increases the risk of overlooking updates to scope variables in unmonitored areas.
Events can still be used even without inheriting scope variables, but caution must be exercised to prevent scope pollution. Utilizing services could be beneficial in such cases, as it ensures immediate visibility of injections.
Considering that a directive obtains the scope it is on (or inherits from), utilizing $watch appears to be a cleaner choice in this context.
If an isolated scope is desired for your directive, passing arguments as attributes and utilizing $observe can fulfill this requirement.
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