Angular4路由parent> child：导航回父级时运行的挂钩？

Question

Say I have two components and their respective routes:

• ParentComponent /parent
• ChildComponent /parent/child

I'm looking for a way to trigger a method on the parent as the router is told to navigate to "../" from the child view.

I look for an equivalent of Ionic's hook "viewDidAppear":

• it's not initialized as it was still in the nav stack
• it's just getting foreground again and some refresh should occur

Thanks for your attention,

Answer 1

Are they parent and child components or parent and child routes ?

When they are parent and child components , then the child component's selector is defined within the parent component's template. When that is the case, you can use @Output to communicate between the parent and the child.

If they are parent and child routes , then the child component's template appears in the parent component's router outlet. In that case you can watch the route parameters with code like this:

this.route.params.subscribe(param => console.log(param));

Add this to the ngOnInit of the parent component to start watching the events. Then, instead of logging as I've shown here, you can trigger the desired method.