Angular16 Router Guards
Introduction:
Angular 16, the latest version of the most popular UI JavaScript Angular framework, brings several exciting features and enhancements, including powerful router guards. angular router guards play an important role in securing your Angular applications by controlling access to different routes based on predefined conditions.
In this article, we learn about the guards to specific routes using the canActivate, canActivateChild, can deactivate, or resolve properties,
We will explore the capabilities of Angular router guards and provide practical examples to help you understand their usage with easy examples effectively.
- Understanding Router Guards:
The Angular 16 of router guards is allow us to define specific conditions for navigating to a route. They act as gatekeepers, evaluating situations before allowing or denying access to a particular route by using the router guards.
- There are four different types of router guards in Angular 16:
1) CanActivate router guards -
2) CanActivateChild router guards -
3) CanDeactivate router guards -
4) Resolve router guards -
1)CanActivate router guards - angular 16 canactivate
This CanActivate router guard determines if a route can be activated or not, based on certain situations such as which include authentication status or user roles.
Example:
const routes : Routes = [
{
path : 'admin',
canActivate : [AuthGuard],
component : AdminComponent
},
];
In the example, We see that the AdminComponent can only be accessed if the AuthGuard returns be true.
2)CanActivateChild router guards -
The CanActivateChild route guard Similar to CanActivate, this guard determines if a child route can be activated within a parent route.
Example:
const routes: Routes = [
{
path : 'admin',
canActivateChild : [AuthGuard],
component : AdminComponent,
children : [
{ path : 'dashboard', component: DashboardComponent },
]
},
];
In this example, the AuthGuard will be applied to all child routes of the AdminComponent.
3) CanDeactivate router guards - ( angular 16 candeactivate )
In CanDeactivate router guard we must determine if a user can leave a route, usually triggered whilst navigating away from a shape with unsaved changes.
Example:
class AngularthinkComponent implements CanDeactivate<FormComponent> {
canDeactivate(component: AngularthinkComponent): boolean {
if (component.hasUnsavedChanges()) {
return confirm('Are you sure you want to leave?');
}
return true;
}
}
Within the above example, the candeactivate approach checks if the AngularthinkComponent has unsaved changes and prompts the user with a affirmation confirmation dialog before letting them navigate away.
4)Resolve router guards -
This resolve router guard lets allows in you to fetch statistics data to move asynchronously earlier than activating a route.
const routes: Routes = [
{
path: 'user/:id',
resolve: {
user: UserResolver
},
component: UserComponent
},
];
In this example, We define the resolve router guards, this UserResolver service is used to fetch the user data before activating the UserComponent.
Implementing Router Guards in Angular 16:
Would you like to add angular routing
- To implement router guards on your angular 16 application, follow those steps:
a. Create guard classes that implement the corresponding Angular Router Guards interfaces (CanActivate, CanActivateChild, CanDeactivate, or Resolve).
b. Register the guard classes as providers in your module or component.
c. Apply the guards to specific routes using the canActivate, canActivateChild, canDeactivate, or resolve properties.
d. Implement the necessary logic within the guard classes to evaluate the conditions for route activation or deactivation.
Benefits of Using Router Guards:
angular routing events
By using router guards in your Angular 16 applications, you can enhance security and control access to different Angular Router Guards. Some benefits include:
- Authentication and authorization: With CanActivate and CanActivateChild guards, they check all requests to ensure that only authenticated users with specific roles can access certain routes.
- Data fetching: The Resolve guard enables you to fetch data before activating a route,
Conclusion :
Angular Router Guards to check authenticate requests for the security and access control of your Angular applications. By implementing these guards, you can control route navigation, protect sensitive areas, and perform necessary checks before activating routes.
In this article, you Understand the different types of Angular Router Guards and applying to their examples to build secure and user-friendly Angular applications.
Start to use and implement Angular Router Guards today and take your web development skills to the next level.
FAQ
1) Can we use multiple guards in Angular?
Ans - Yes, you can use multiple guards in Angular.
Angular allows the usage of multiple guards.
It is possible to use more than one guard in Angular. read more
2) How to deactivate guard in Angular?
Ans- To deactivate guard in Angular, simply remove it from the canActivate property in the route configuration. Alternatively, you can set the canActivate property to an empty array [] or remove the guard from the array if multiple guards are used. This will allow unrestricted access to the specified route. Always ensure the implications of deactivating a guard on the application's security and functionality.
3) What is router state snapshot?
Ans - A router state snapshot is a saved representation of a webpage's URL and component states in a single instance. It allows users to bookmark or share specific application states, ensuring consistent views across sessions. This aids SEO by enabling search engines to index and display relevant snapshots, enhancing user experience and accessibility to specific content on a website. Read more
4) What is the difference between CanLoad and CanMatch in Angular?
Ans - CanLoad in Angular is used to prevent lazy-loaded modules from being loaded based on certain conditions. It guards against unauthorized access to modules. On the other hand, CanMatch guards routes to control navigation based on conditions. It allows or denies route activation based on URL patterns. Both are used for access control but at different levels - module loading and route navigation, respectively.
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