How to create a login page in angular 7

How do I create a login page in angular 10?

Running the Angular 10 Login Tutorial Example Locally

Install NodeJS and NPM from Install all required npm packages by running npm install or npm i from the command line in the project root folder (where the package.

Is user logged in angular?

Angular 7 Authentication Service

The logged in user details are stored in local storage so the user will stay logged in if they refresh the browser and also between browser sessions until they logout.

What is Authguard in angular?

Auth-guard makes use of CanActivate interface and it checks for if the user is logged in or not. If it returns true, then the execution for the requested route will continue, and if it returns false, that the requested route will be kicked off and the default route will be shown.

What is Authservice in angular?

The authentication service is used to login & logout of the Angular app, it notifies other components when the user logs in & out, and allows access the currently logged in user. If successful the user object including a JWT auth token are stored in localStorage to keep the user logged in between page refreshes.

What is pipe in angular?

Use pipes to transform strings, currency amounts, dates, and other data for display. Pipes are simple functions you can use in template expressions to accept an input value and return a transformed value. Pipes are useful because you can use them throughout your application, while only declaring each pipe once.

What is CanActivateChild in angular?


Interface that a class can implement to be a guard deciding if a child route can be activated. If all guards return true , navigation continues. If any guard returns false , navigation is cancelled.

What is AuthGuard?

AuthGuard is a class which implements the interface CanActivate , to decide whether the user has access/permission to view specific page / route / path in the application or not. This will be useful when we need authentication/authorization based control over the application.

Can you activate example?

canActivate will only execute when the parent component is not yet created. For example, if we navigate to the parent route it will be called, if we then navigate to a child route it will not. If we directly navigate to the child route, the canActivate guard will also be executed.

What is CanDeactivate?

CanDeactivate is an interface that is implemented by a class to create a guard which decides if a route can be deactivated. The guard can be added to any component route using canDeactivate attribute of Angular Route interface.

Can activate and deactivate in angular?

CanDeactivate is a TypeScript interface that needs to be implemented by a component to create a route guard. This guard will be used by the router to decide if the route can be deactivated. It can be implemented in any Angular component using the canDeactivate method of the interface.

What is CanActivate and CanDeactivate in angular?

CanActivate – Decides if a route can be activated. CanActivateChild – Decides if children routes of a route can be activated. CanDeactivate – Decides if a route can be deactivated.

What is CanLoad in angular?

The Angular Route Guards are used to control, whether the user can navigate to or away from a given route. The canload guard determines whether a particular lazy loaded child route can be loaded. Sometimes, we want to prevent the loading of the modules for unauthorized users. This is where we use the CanLoad Guard.

How do you implement CanDeactivate?

How to use CanDeactivate Guard
  1. canDeactivate(component: T, currentRoute: ActivatedRouteSnapshot,
  2. currentState: RouterStateSnapshot, nextState?: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree.
  3. }

Can you activate guard?


Interface that a class can implement to be a guard deciding if a route can be activated. If all guards return true , navigation continues. If any guard returns a UrlTree , the current navigation is cancelled and a new navigation begins to the UrlTree returned from the guard.

Can activate VS can load?

canActivate is used to prevent unauthorized users from accessing certain routes. canLoad is used to prevent the application from loading entire modules lazily if the user is not authorized to do so. See docs and example below for more info.

What is resolver in angular?

A Resolver is a class that implements the Resolve interface of Angular Router. In fact, Resolver is a service that has to be [provided] in the root module. Basically, a Resolver acts like middleware, which can be executed before a component is loaded.

What is lazy loading in angular?

Lazy loading is a technique in Angular that allows you to load JavaScript components asynchronously when a specific route is activated. It improves the speed of the application load time by splitting the application into several bundles. When the user navigates through the app, the bundles are loaded as required.

Should I use resolver angular?

Important:: Use resolver when you want to fetch the data even before the user is routed to the URL. Resolver could include service calls which would bring us the data required to load the next page. The resolver gives you a hook near the start of router navigation and it lets you control the navigation attempt.

What are angular lifecycle hooks?

Your application can use lifecycle hook methods to tap into key events in the lifecycle of a component or directive in order to initialize new instances, initiate change detection when needed, respond to updates during change detection, and clean up before deletion of instances.

What is ngOnInit () in angular?

ngOnInit is a life cycle hook called by Angular to indicate that the Angular is done creating the component. In order to use OnInit we have to import it in the component class like this: import {Component, OnInit} from ‘@angular/core’; Actually implementing OnInit in every component is not mandatory.

What is the correct order of lifecycle hooks in angular?

ngAfterViewInit: Called after a component’s view or child view is initialized. ngAfterViewChecked: Called after a component’s view or child view is checked. ngOnDestroy: Called once when the component is destroyed and a good hook to use to cleanup and unsubscribe from observables.