March 2017
Intermediate to advanced
118 pages
2h 1m
English
Content preview from Angular RouterBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CanDeactivate
The canDeactivate guard is different from the rest. Its main purpose is not to check permissions, but to ask for confirmation.
To illustrate this let's change the application to ask for confirmation when the user closes the compose dialog with unsaved changes:
[
{
path: 'compose',
component: ComposeCmp,
canDeactivate: [SaveChangesGuard]
outlet: 'popup'
}
]Where
SaveChangesGuard
is defined as follows:
class SaveChangesGuard implements CanDeactivate<ComposeCmp> { constructor(private dialogs: Dialogs) {} canDeactivate(component: ComposeCmp, route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Promise<boolean> { if (component.unsavedChanges) { return this.dialogs.unsavedChangesConfirmationDialog(); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.