Vue 2.0 has deprecated the use of $dispatch and $broadcast.
I have noticed that $dispatch is similar to $emit.
What are the key differences between them? Can we safely replace $dispatch with $emit during migration?
Vue 2.0 has deprecated the use of $dispatch and $broadcast.
I have noticed that $dispatch is similar to $emit.
What are the key differences between them? Can we safely replace $dispatch with $emit during migration?
It's important to note that you cannot simply replace $disptach with $emit in all cases. While you can substitute it when communicating from a child to parent, other scenarios will require a different approach.
As mentioned in the official documentation (similar comments from Evan found in Upgrade Tips):
While these methods are commonly used for communication between parents and direct children, you can actually listen to an $emit from a child using v-on. This provides the convenience of events with added clarity.
However, if you need to communicate between distant descendants/ancestors, using $emit alone won't be sufficient. In such cases, consider using a centralized event hub as a straightforward upgrade option.
Referring to the documentation on $dispatch:
$dispatch allows you to trigger an event first on the instance itself and then propagate it upwards along the parent chain. The propagation stops once it reaches a parent event listener, unless the listener returns true.
On the flip side, utilizing $emit:
This method triggers an event on the current instance, with any additional arguments passed into the listener’s callback function.
Therefore, it is crucial to understand that when passing communication through multiple layers of parent elements using $dispatch, you'll need to handle the code differently when switching to $emit
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