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Vue: Advance parent child communication

Sometimes I am doing so complicate / advanced programming stuffs that I want to share but then I realize that I might not have the right audience for it. That's so sad. I guess I'll just blog about it

FYI it is about @vuejs

Before I actually describe it, let me start by reminding you message exchange between parent and child components:

parent to child: props
child to parent: event

What if you need the child component to be notified when the parent is doing a particular event. We can sure try to set a prop and pass it down through the components tree. There is a better solution involving provide/inject.

But that's still do not solve my problem. Let me explain the situation:

I have a layout (root component) that have a return button
There is details page that should redirect to the list page
The layout component does not know about the details page

Let me know how you guys would solve this ? cc @youyuxi

the layout is in charge of the return button but we needed the financial page to handle the return button that's the problem