Ionic5: setting a footer on all app pages with a sharedModule and controlling it (on/off) from the app.component - dynamic

Question

I've created a new app using Ionic5 with a menu. I'm trying to use a Footer on multiple pages (now only on Home page). First I've created a SharedModule and imported in the imports' array of the app.module.ts. I've added the footer component in the declarations' and exports' array of the shared.module.ts. Also I added SharedModule in the imports' array of each page.module.ts, and finally adding <app-footer> in each page.html.
It works as expected, showing the footer in all pages. But now I need to control (on/off) this footer from my app.component, in response to a specific event, for example, when internet is not available (this part is not a problem).
footer.component.ts
import { Component, OnInit } from '#angular/core';
import { FooterService } from 'src/app/footer.service';
#Component({
selector: 'app-footer',
templateUrl: './footer.component.html',
styleUrls: ['./footer.component.scss'],
})
export class FooterComponent implements OnInit {
public FooterEnabled: boolean= false;
constructor() { }
ngOnInit() {
}
}
The FooterEnabled variable control if the footer is showed or not and must be modifiable from the app.component
footer.component.html
<div class="footer-conn" *ngIf="FooterEnabled">
Alert!
</div>
sharedfooter.module.ts
import { NgModule } from '#angular/core';
import { CommonModule } from '#angular/common';
import { FooterComponent } from '../components/footer/footer.component';
#NgModule({
declarations: [FooterComponent],
imports: [
CommonModule
],
exports: [
FooterComponent, CommonModule
]
})
export class SharedFooterModule { }
app.module.ts
import { NgModule } from '#angular/core';
import { BrowserModule } from '#angular/platform-browser';
import { RouteReuseStrategy } from '#angular/router';
import { IonicModule, IonicRouteStrategy } from '#ionic/angular';
import { SplashScreen } from '#ionic-native/splash-screen/ngx';
import { StatusBar } from '#ionic-native/status-bar/ngx';
import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
import { Network } from '#ionic-native/network/ngx';
import { SharedFooterModule } from './shared/sharedfooter.module';
#NgModule({
declarations: [AppComponent],
entryComponents: [],
imports: [
BrowserModule,
IonicModule.forRoot(),
AppRoutingModule,
SharedFooterModule
],
providers: [
StatusBar,
SplashScreen,
Network,
{ provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
],
bootstrap: [AppComponent]
})
export class AppModule {}
app.component.ts
import { Component, OnInit } from '#angular/core';
import { Platform } from '#ionic/angular';
import { SplashScreen } from '#ionic-native/splash-screen/ngx';
import { StatusBar } from '#ionic-native/status-bar/ngx';
import { Network } from '#ionic-native/network/ngx';
#Component({
selector: 'app-root',
templateUrl: 'app.component.html',
styleUrls: ['app.component.scss']
})
export class AppComponent implements OnInit {
public selectedIndex = 0;
public appPages = [
{
title: 'Página 1',
url: 'home',
icon: 'mail'
},
{
title: 'Página 2',
url: 'pagina2',
icon: 'paper-plane'
},
{
title: 'Página 3',
url: 'pagina3',
icon: 'heart'
}
];
constructor(
private platform: Platform,
private splashScreen: SplashScreen,
private statusBar: StatusBar,
private network: Network
) {
this.initializeApp();
}// Fin constructor
no_internet() {
alert("No internet!")
// In this point make FooterEnabled = true (from the footer component)
}
si_internet() {
alert("Whith internet!")
//In this point make FooterEnabled = false (from the footer component)
}
initializeApp() {
this.platform.ready().then(() => {
this.statusBar.styleDefault();
this.splashScreen.hide();
});
}
ngOnInit() {
let disconnectSubscription = this.network.onDisconnect().subscribe(() => {
setTimeout(() => {
if (this.network.type !== 'none') {
this.si_internet();
}
else {
this.no_internet();
}
}, 1000);
});
// watch network for a connection
let connectSubscription = this.network.onConnect().subscribe(() => {
setTimeout(() => {
if (this.network.type !== 'none') {
this.si_internet();
}
else {
this.no_internet();
}
}, 3000);
});
const path = window.location.pathname.split('/')[1];
if (path !== undefined) {
this.selectedIndex = this.appPages.findIndex(page => page.title.toLowerCase() === path.toLowerCase());
}
}
}
home.module.ts (as an example)
import { NgModule } from '#angular/core';
import { CommonModule } from '#angular/common';
import { FormsModule } from '#angular/forms';
import { IonicModule } from '#ionic/angular';
import { HomePageRoutingModule } from './home-routing.module';
import { HomePage } from './home.page';
import { SharedFooterModule } from '../shared/sharedfooter.module';
#NgModule({
imports: [
CommonModule,
FormsModule,
IonicModule,
HomePageRoutingModule,
SharedFooterModule
],
declarations: [HomePage]
})
export class HomePageModule {}
I've tried with a service imported in the footer.component and app.component.ts that implements observables, but it didn't work. I will appreciate your contributions!!

Answer 1

maybe you can do it like bellow, add input to your footer component :
footer.component.ts
import { Component, OnInit, Input } from '#angular/core';
#Component({
selector: 'app-footer',
templateUrl: './footer.component.html',
styleUrls: ['./footer.component.scss'],
})
export class FooterComponent implements OnInit {
#Input() FooterEnabled : string;
//public FooterEnabled: boolean= false;
constructor() { }
ngOnInit() {
}
}
footer.component.ts
<div class="footer-conn" *ngIf="FooterEnabled == 'on'">
Alert!
</div>
on your app.component.ts add new varibale status:
no_internet() {
alert("No internet!")
this.status = 'on'
}
si_internet() {
alert("Whith internet!")
this.status = 'off'
}
put it on app.component.html as :
<app-footer FooterEnabled="status" ></app-footer>