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How to pass index.html value from component in angular 2

I have an angular2 project where it index.htmlcontains a title bar. Other components will take care of registering and displaying other things.

I need to show the logo in the title bar, which is present in index.htmlonly if the user is logged in. I set the flag to app.component.tsif the user is logged in. How to pass this flag to index.html?

<body>
    <div class="content-body">
        <header class="header">
            <div class="header-bar container">
                <div class="header-bar__main">
                    <div class="header-heading">
                        <h1 class="page-title">noHold Application</h1>
                    </div>
                </div>
                <a class="btn btn--small btn--icon ng-scope" title="Logout"><span class="icon-sign-out"></span></a> // this line should be displayed only if user logs in.
            </div>
        </header>
        <div class="content">
            <div class="content__main">
                <div class="container">
                    <app-root>Loading... </app-root>        
                </div>
            </div>
        </div>
    </div>

</body>

app.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {

  static loggedIn = false;

  getLoggedIn() {
    return AppComponent.loggedIn;
  }

}
+4
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2 answers

Angular (AppComponent , ) ( , , , ..).

app.component.html . :

app.component.html

<header></header>
<router-outlet></router-outlet>

HeaderComponent / header, (: AboutComponent) / router-outlet.

header.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'header',
  templateUrl: './header.component.html',
  styleUrls: ['./header.component.css']
})
export class HeaderComponent {
  public loggedIn = false;

  ...
}

header.component.html

  <header class="header">
    <div class="header-bar container">
      <div class="header-bar__main">
        <div class="header-heading">
          <h1 class="page-title">noHold Application</h1>
        </div>
      </div>
      <div *ngIf="loggedIn">
        <a class="btn btn--small btn--icon ng-scope" title="Logout"><span class="icon-sign-out"></span></a>
      </div>
    </div>
  </header>

, .

+4

. . . .

. , :

class User {
  firstName: string;
  lastName: string;
  ...
}

, :

class Session {
  user: User;
  isLogged: boolean;

  login(user: User) {
    this.user = user;
    this.isLogged = true;
  }
}

, Session :

@NgModule({
  ...
  providers: [
    ...
    { provide: 'session', useValue: new Session() },
    ...
  ],
  ...
})

. , :

@Component({
  ...
})
class LoginComponent {
  constructor(private session: Session) {
  }

  private login() {
    let user = ....;  // Retrieve user from backend service...
    this.session.login(user);
  }
}

:

<div *ngIf="session.isLogged">
  <a class="btn btn--small btn--icon ng-scope" title="Logout"><span class="icon-sign-out"></span></a>
</div>
+1

Source: https://habr.com/ru/post/1672809/

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