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BassemMamar / angular-starter-v6

Angular Starter v6

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Angular Starter v6

This project is an Angular 6.1.0 project, and was generated with Angular CLI version 6.1.5.

Table of contents

Quick Start

Make sure you have Node version >= 6.x and NPM >= 5.x

# clone our repo
git clone  https://github.com/BassemMamar/angular-starter-v6.git

# WINDOWS only. In terminal as administrator
npm install -g node-pre-gyp typescript @angular/cli gulp-cli @compodoc/compodoc 

# install the repo with npm
npm install

# start the server
npm start

# build 
npm run build

# documentaion 
npm run doc

The app will be automatically launched in http://localhost:4200/home.

File Structure

We use the component approach in our starter. This is the new standard for developing Angular apps and a great way to ensure maintainable code by encapsulation of our behavior logic. A component is basically a self contained app usually in a single file or a folder with each concern as a file: style, template, specs, e2e, and component class. Here's how it looks:

Onboarding Suite v2/
 ├──e2e/                                        * End to end testing goes here.
 ├──src/                                        * Our source files that will be compiled to javascript.
 |   ├──main.ts                                 * Our entry file for our browser environment.
 |   ├──index.html                              * Index.html: where we generate our index page.
 |   ├──styles.scss                             * Styles.scss: where we add our global styles, and also import other style files.
 |   ├──polyfills.ts                            * Our polyfills file to support older browsers.
 │   │
 │   ├──app/                                    * WebApp: folder.
 │   │   ├──app.module.ts                       * Main angular app module (bootstrapping module).
 │   │   ├──app-routing.module.ts               * Main app routing module, imported as `forRoot` to create app `Route` service.
 │   │   ├──app.component.ts                    * Main app component, where route navigations lifecycle handle.
 │   │   │
 │   │   ├──core/                               * Drives the angular application, hold singliton services like auth.
 │   │   ├──shared/                             * Resuable module which used across multiple modules and areas of the application.
 │   │   ├──layout/                             * Main components like `Header`, `Footer`, `breadcrumbs` etc.. 
 │   │   ├──dashboard/                          * Default module where home page goes.
 │   │   └──feature-modules/                    * Main app feature modules which will lazy load.
 │   │       ├──management/                     * Management module. 
 │   │       ├──investigation/                  * Investigation module. 
 │   │
 │   ├──assets/                                 * Static assets are served here
 │   │   └──web.config                          * Required for iis re-write URLs.
 │   │
 │   └──environments/                           * (Development/ staging/ Production) configurations.
 │ 
 │
 │
 │
 ├──.angular-cli.json                           * Angular cli configuratino file.
 ├──tslint.json                                 * Typescript lint config.
 ├──tsconfig.json                               * Typescript config used outside webpack.
 ├──package.json                                * what npm uses to manage its dependencies.
 └──webpack.config.js                           * webpack main configuration file.

** More details is comming down.

Key Modules

Core Module

CoreModule contains code that will be used to instantiate the app and load some core functionality. In the other words, CoreModule drives the Angular application.

What goes in CoreModule?

The clearest and most important use of the CoreModule is the place to put global HTTP Interceptor, Authentication Guard and Authentication Service. The idea is to make sure only one instance of those services will be created across the entire app. The CoreModule, by convention, is only included in the entire app once in AppModule (only in the import property of the @NgModule() decorator inside the main app.module.ts, not in any other module's import) and this will ensure services inside it will be only created once in the entire app. This is especially important since we intend to lazy-load our feature modules. Since lazy-loaded modules are loaded on demand (eg when you access the route using the lazy-loaded feature), you could end up creating new instances of supposedly singleton services if you don't put them in CoreModule.

Important single use components/classes also go in the CoreModule. Good candidates are global components that go in your main AppComponent. This allows you to keep this global component in one spot and make sure there's only have one copy of it across the app.

The CoreModule also used to export any third party module that is required in the AppModule. The idea is to keep AppModule as lean as possible.

Core Module File Structure

core/
 ├──auth/                                       * Authentication module which handle login, logout, authenticate user, authorize areas, interceptor http requests and responses
 |   ├──callback/                               * Simple component to handle oidc-client login redirect callback.
 |   ├──guards/                                 * Contain authorized/authenticated guards.
 |   ├──interceptor/                            * Intercept http requests to inject access_token.
 |   ├──pages-access-authorization/             * Contain our app pages access roles structure and `authorization.service` which used to check user authority to access any page.
 │   ├──services/                               * Where main app auth service and exist.
 │   │
 │   └──auth.module                             * Auth module file.
 │ 
 ├──base/                                       * Abstract services which can be reused in any other application (drag and drop :D ). 
 |   ├──global-error-handler/                   * Global unexpected app error handler.
 |   ├──http-timing-interceptor/                * Http interceptor which calculate http requsts time cost.
 |   ├──lazy-loading/                           * Contain preloading strategy service to support lazy-loaded modules.
 |   ├──logger/                                 * Logging service to log into the console.
 |   ├──module-import-guard/                    * Gurds to ensure that specific module not being imported more that once, important for `CoreModule`.
 |   ├──default-http-request-options/           * Default http request options.
 |   ├──storage/                                * Storage module to store informations in store like cookies.
 |   ├──url-case-insensitive/                   * Contain angular url matcher to apply urls case insensitive.
 |   └──utils/                                  * Service to provide Common javascript functionality.  
 │ 
 ├──components/                                 * Main app components like 404, 401, 500 and page loader.
 │
 ├──services/                                   * Main app required services. 
 |   ├──communication/                          * Handle sub-domain case and provide multi api urls. 
 |   └──http-error-handling/                    * Centralize http error response handler.
 │ 
 └──third-party-modules/                        * Place to import any future 3rd party module want to use. 
 │
 ├──core-routing.module                         * Core routing module to define route configurations to it's components. 
 └──core.module                                 * Core module file.

Shared Module

SharedModule contains directives and components which may be used across multiple modules and areas of the application.

What goes in SharedModule?

SharedModule similarly contains code that will be used across your app and Feature Modules. But the difference is that you will import this SharedModule into the specific Feature Modules as needed.

Common templates components (like Alert, BlockUI, Toastr etc...) should also go in the SharedModule. Commonly used pipes (ie filters) and directives should go in your SharedModule, too. Prime examples would be custom string/date filters.

In the SharedModule's main file (eg shared.module.ts), might also export the commonly used Angular modules, for example:

  • CommonModule from @angular/common for the *ngIf structure directive.
  • FormsModule from @angular/forms for the [(ngModel)] directive.

So they can be easily used across your app, without importing them in every Feature Module.

This might be introduce unnecessary loading speed if you don't use those modules/directives a lot. If that's the case, you might want to do it the old fashioned way and import these Angular modules only in the Feature Modules that use them.

Shared Module File Structure

shared/
 ├──components/                                 * Shared componenrs declaration.
 ├──directives/                                 * Shared directives declaration. 
 ├──pipes/                                      * Shared pipes declaration. 
 |
 └──shared.module                                * Shared module file.

Layout Module

LayoutModule contains common template parts which may be used in any other feature module's base view. It will be imported to any module if needed.

What goes in SharedModule?

LayoutModule contains components provide main html parts like Header, Footer, Shared Menu etc...

  • HeaderComponent display application logo, provide links to navigate to main app modules and popover menu for login/logout stuff.

  • BreadcrumbsComponent independently display current breadcrumb state for the page (for the future).

  • FooterComponent html footer template.

Notes:

It's not part of SharedModule because it contain reusable components for html parts, logically AlertComponents not like HeaderComponents.

It's not part of CoreModule to support flexibility to acustomize base template in each feature module, for example i want to show header in one module and don't want in the other.

Layout Module File Structure

Layout/
 ├──header/                                         * Header template which contains login section.
 ├──breadcrumbs/                                    * Breadcrumbs template /not ready for now/.
 ├──footer/                                         * Footer template.
 |
 └──Layout.module                                   * Layout module file.

FAQs

How to apply authentication or authorization in an angular routes?

To secure our routes, there is two main Angular Guards AuthenticatedGuard and AuthorizedGuard.

AuthenticatedGuard:

This guards is responsible for checking if there is a user logged in or not, return true/false.

To use this guard simply add it to CanActivate or canActivateChild:

  {
    path: 'Investigation',
    component: InvestigationComponent,
    canActivate: [AuthenticatedGuard],
    canActivateChild: [AuthenticatedGuard],
    ...
  }

Remember that canActivate is applied when trying to access the route it self, weather canActivateChild is applied when trying to access any child route, that's mean it will protect all module routes.

AuthorizedGuard:

This guards is responsible for checking if the user has a right to access this route(or page).

To use this guard simply add it to CanActivate or canActivateChild:

  {
    path: 'Investigation',
    component: InvestigationComponent,
    canActivate: [AuthorizedGuard],
    canActivateChild: [AuthorizedGuard],
    ...
  }

For Authorization part you need to provide more informations because we want to have Authorization/AccessLevel in each page.

What it's possible to authorize each single page?

After user is logged in, the App will ask for pagesAccessAuthorizationInfo from an api (for now it's fixed in the client) which contain all information for each page:

[
    // Management module
    {
        name: FrontendShell.Management.Name,
        rolesAccess: [
            { role: UserRole.Manager, accessLevel: AccessLevel.FullAccess }
        ],
        pages: [
            {
                name: FrontendShell.Management.Pages.ListBusiness,
                rolesAccess: [
                    { role: UserRole.Manager, accessLevel: AccessLevel.FullAccess },
                ]
            },
            {
                name: FrontendShell.Management.Pages.EditBusiness,
                rolesAccess: [
                    { role: UserRole.Manager, accessLevel: AccessLevel.FullAccess },
                ]
            }
        ]
    },

    // Investigation module
    {
        name: FrontendShell.Investigation.Name,
        rolesAccess: [
            { role: UserRole.Investigator, accessLevel: AccessLevel.FullAccess },
        ],
        pages: [
            {
                name: FrontendShell.Investigation.Pages.RecentJourneys,
                rolesAccess: [
                    { role: UserRole.Investigator, accessLevel: AccessLevel.ReadOnly },
                ]
            }
        ]
    }

]

Notice that:

  • pagesAccessAuthorizationInfo is an array ob objects.
  • Each object refers to module(feature module).
  • Module object contains of:
    • name this module name.
    • rolesAccess default of pair role/accessLevel for this module pages
    • pages array of this module's pages:
      • name page name.
      • rolesAccess pair of role/accessLevel for this specific page.

So AuthorizedGuard will depend on this information to determine if the user has right to access the page or not, and all what you need to do is to pass moduleName and pageName informations.

Examples:

General case is to provide `pageName` and optional `moduleName` for each route(page) we want to authorize it:
  {
    path: 'Investigation',
    component: InvestigationComponent,
    children: [
      {
        path: 'RecentJourneys',
        component: RecentJourneysComponent,
        canActivate: [AuthorizedGuard],
        data: {
          moduleName: FrontendShell.Investigation.Name, // this is optional
          pageName: FrontendShell.Investigation.Pages.RecentJourneys
        }
      }
    ]
  }

In case both module name and page name are provided:

  • First get the matched module information (throw exception if there is no such a module).
  • Second get matched pages in this module.
  • As a result will have a collection of matched pages in one module(should be a collection of one page and throw an exception if not).
  • Finally reach rolesAccess array and extract an array of roles from it for this page.
Another case is to provide just `pageName` for the route(page) we want to authorize it:
  {
    path: 'Investigation',
    component: InvestigationComponent,
    children: [
      {
        path: 'RecentJourneys',
        component: RecentJourneysComponent,
        canActivate: [AuthorizedGuard],
        data: {
          pageName: FrontendShell.Investigation.Pages.RecentJourneys
        }
      }
    ]
  }

In case Just page name is provided:

  • In this case will try to get any matched page in the all modules.
  • Do some validation(should exist in one module and throw an exception if not)
  • As a result will have a collection of matched pages in one module(should be a collection of one page and throw an exception if not).
  • Finally reach rolesAccess array and extract an array of roles from it for this page.
Another case is to provide just `moduleName` for the route(page) we want to authorize it:
  {
    path: 'Investigation',
    component: InvestigationComponent,
    children: [
      {
        path: 'RecentJourneys',
        component: RecentJourneysComponent,
        canActivate: [AuthorizedGuard],
        data: {
          moduleName: FrontendShell.Investigation.Name
        }
      }
    ]
  }

In case Just module name is provided:

  • In this case will try to get default rolesAccess specified for the module it self and extract an array of roles from it for this page.
Another case is to not provide nither `moduleName` nor `pageName` for the route(page) we want to authorize it:
  {
    path: 'Investigation',
    component: InvestigationComponent,
    children: [
      {
        path: 'RecentJourneys',
        component: RecentJourneysComponent,
        canActivate: [AuthorizedGuard],
        data: {
        }
      }
    ]
  }

In case Nither module name nor page name is provided:

  • In this case will throw an exception with message: 'Can NOT check authority for unknown moduleName and pageName.'
Special case to provide `moduleName` for the route (as a parent) when you already know that the route including it's children has same authority:
  {
    path: 'Investigation',
    component: InvestigationComponent,
    canActivateChild: [AuthorizedGuard],
    data: {
      moduleName: FrontendShell.Investigation.Name
    },
    children: [
      {
        path: 'RecentJourneys',
        component: RecentJourneysComponent,
      },
      {
        ...
      }
    ]
  }

In case Module name for parent route is provided:

  • Remember that canActivateChild applied just when try to access any child route but NOT the route it self.
  • In this case all the routes declared in the children section will have the same authority which is for Investigation module.
  • If you provide both module name and page name in the parent route, then all children routes will have this page's authority.
  • any data provided from child route will be ignored in the current implementaion.

Keep In Mind that in our implementaion:

CanActiviate reads moduleName and pageName from current route's data object.

CanActiviateChild reads moduleName and pageName from parent route's data object.

Access Level Resolver:

This service is responsible for providing AccessLevel value for the page according to the current user's roles.

AccessLevel is:

enum AccessLevel {
    ReadOnly = 'ReadOnly',
    FullAccess = 'FullAccess'
}

To use this service simply add it to the route's resolve property:

  {
    path: 'Investigation',
    component: InvestigationComponent,
    data: {
      moduleName: FrontendShell.Investigation.Name
    },
    children: [
      {
        path: 'RecentJourneys',
        component: RecentJourneysComponent,
        resolve: {
          accessLevel: AccessLevelResolver
        }
      }
    ]
  }

AccessLevelResolver service will try to reach moduleName and pageName from the route it specified in, if doesn't find one or both of them, then it will try to reach missed one in the parrent route.

How to use block ui in my component?

let's say that we want to block add user div in the user.component:

In the `user.component.ts` there are two ways to control when to start/stop blocking:

1) Declare a variable with the @BlockUI() decorator:

import { BlockUI, NgBlockUI } from 'ng-block-ui';
import { BlockUITemplateComponent } from 'shared/components/block-ui/block-ui-template.component';

@Component({
  templateUrl: './user.component.html',
  styleUrls: ['./user.component.scss']
})
export class UserComponent implements OnInit {

  // Create an instance from our block ui template
  blockTemplate = BlockUITemplateComponent;

  @BlockUI('block-add-user') blockAddUser: NgBlockUI;
  
  constructor(){}

  addUser() {
  this.blockAddUser.start();
  this.userService.add(userObject)
    .subscribe(
     (res) => {

       // do stuff when add user success
       this.blockAddUser.stop();
     },
     (error) => {
       
       // do stuff when add user failed
       this.blockAddUser.stop();
     });
  }

}

2) Using the BlockUIService which allows you to easily target multiple instance:

import { BlockUIService, NgBlockUI } from 'ng-block-ui';
import { BlockUITemplateComponent } from 'shared/components/block-ui/block-ui-template.component';

@Component({
  templateUrl: './user.component.html',
  styleUrls: ['./user.component.scss']
})
export class UserComponent implements OnInit {

  // Create an instance from our block ui template
  blockTemplate = BlockUITemplateComponent;

  constructor(private blockUIService: BlockUIService){}

  addUser() {
  this.blockUIService.start('block-add-user');
  this.userService.add(userObject)
    .subscribe(
     (res) => {

       // do stuff when add user success
       this.blockUIService.stop('block-add-user');
     },
     (error) => {
       
       // do stuff when add user failed
       this.blockUIService.stop('block-add-user');
     });
  }

}

Notes:

  • You can pass optional message with .start().
  • BlockUIService can start/stop many instances by passing array of there names: .start(['..'])
In the `user.component.html` add `blockUI ` directive to that div with an appropriate parameters:
<div *blockUI="'block-add-user'; template:blockTemplate; message:'Proccessing... '">
    // add user section
    ...
</div>

Notes:

  • As a convintion let's always add name prefix block- for *blockUI name.
  • blockTemplate is an instance reference of our custom block ui component template (property in the home.component.ts), if you don't provide it then default style will be applied, and for this case i import custom css style in the style.scss '@import "~app/shared/components/block-ui/block-ui-template.component.scss";'
  • message is an optional message to show during blocking.
  • Keep in mind to use AfterViewInit Lifecycle hook when needed.

We depend on ng-block-ui library for blocking ui, for more details read there documentaion.

How to use toastr in my component?

let's say that we want to show toastr message for adding user result in the user.component:

import { ToastrService } from 'shared/components/toastr/toastr.service';

@Component({
  templateUrl: './user.component.html',
  styleUrls: ['./user.component.scss']
})
export class UserComponent implements OnInit {

  constructor(private toasrtService: ToastrService){}

  addUser() {
  this.userService.add(userObject)
    .subscribe(
     (res) => {

       // do stuff when add user failed
       // Display a success toast, with a title
       this.toasrtService.success('User has been added successfully!', 'Done');
     },
     (error) => {
       
       // do stuff when add user failed
       // Display an error toast, with a title
       this.toasrtService.error(error.message, 'Opps!');
     });
  }

}

Notes:

  • You can override global options, for example: this.toasrtService.success('We do have the Kapua suite available.', null, { timeOut: 2000 });
  • You can remove/clear all current toasts:
    this.toasrtService.remove();, this.toasrtService.clear();.

We depend on toastr library, for more details read there documentaion.

How to use alert notification in my component?

let's say that we want to show fixed alert for adding user result in the user.component:

In the `user.component.ts`:
import { AlertService } from 'shared/components/alert/alert.service';

@Component({
  templateUrl: './user.component.html',
  styleUrls: ['./user.component.scss']
})
export class UserComponent implements OnInit {

  constructor(private alertService: AlertService){}

  addUser() {
  this.userService.add(userObject)
    .subscribe(
     (res) => {

       // do stuff when add user failed
       // Display a success fixed alert, with a title
       this.alertService.success('User has been added successfully!', 'Done');
     },
     (error) => {
       
       // do stuff when add user failed
       // Display an error toast, with a title
       this.alertService.error(error.message, 'Opps!');

     });
  }

}
In the `user.component.html` add `shrd-alert` element where you want to show alert:
<shrd-alert></shrd-alert>

Notes:

  • You can declare alert element with an id, and then show message in that specific alert:
<shrd-alert [id]="'root'"></shrd-alert>

and in the component you can pass option to push choose that alert:

this.alertService.success(message, title, { hostId: 'root' });

Declare an alert with id is the way if you want to have Golbal alert in one central place to show messages in the module base template.

Notes:

  • You can specify showDuration time to show alert, and remove it after this time:
this.alertService.success(message, title, { showDuration: 5000 }); // by default showDuration is 0

Notes:

  • If you didn't provide showDuration option, or you provide showDuration: 0 , the alert will not being removedat all.
  • showDuration is millisecond.

How to use Modal in my component?

let's say that we want to show some formation in a modal in the user.component:

In the `user.component.ts`:
import { ModalComponent } from 'shared/components/modal/modal.component';

@Component({
  templateUrl: './user.component.html',
  styleUrls: ['./user.component.scss']
})
export class UserComponent implements OnInit, AfterViewInit {

  @ViewChild(ModalComponent) private modal: ModalComponent;

  constructor(){}

  ngAfterViewInit(): void {
    this.registerModalEvents();
  }

  showModal() {
    this.modal.show();
  }

  save(saved: boolean) {
    if (saved) {
      this.modal.hide();
    }
  }

// https://v4-alpha.getbootstrap.com/components/modal/#events
  registerModalEvents() {
    $(`#${this.modal.id}`).on('hidden.bs.modal', (e) => {
      // do something...
    });
  }

}

Notes:

  • Use AfterViewInit life cycle if you need to do sth with @ViewChild instance.
In the `user.component.html`:
<shrd-modal [id]="'exampleModal'" [title]="'Modal title'" (onSaved)="save($event)">
    // modal content goes here...
    ...
</shrd-modal>

Notes:

  • onSaved event is triggered when use click on save button, so that you can do what you need to do in this case.
  • You can inject any content you want, even our shared component like <shrd-alert [id]="'modal-alert'"></shrd-alert>.

We depend on Bootstrap Modal, for more details read there documentaion.

How to use sweetalert2 in my component?

let's say that we want to show sweet alert for adding user result in the user.component:

// ES6 Modules or TypeScript
import swal from 'sweetalert2';

@Component({
  templateUrl: './user.component.html',
  styleUrls: ['./user.component.scss']
})
export class UserComponent implements OnInit {

  constructor(){}

  addUser() {
  this.userService.add(userObject)
    .subscribe(
     (res) => {

       // do stuff when add user failed
       // Display a sweet-alert2 success
       swal('Done', 'User has been added successfully!', 'success');
     },
     (error) => {
       
       // do stuff when add user failed
       // Display a sweet-alert2 error
      // swal('Oops!', error.message, 'error');
     });
  }

}

We depend on sweetalert2 library, for more details read there documentaion.

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