How to prevent or disable the hardware back button on an Ionic 4 device

Question

How to prevent or disable the hardware back button on an Ionic 4 device

I am currently utilizing Angular routing with @angular/router in my Ionic 4 project. I have been attempting to disable the device back-button in Ionic 4, but prevent-default is not working for me. Below is the code snippet from my app.component.ts file:

    this.platform.backButton.subscribe(() => {
        if (this.router.url === '/Login') {
          this.util.presentAppExitAlert();
        } else {
          // event.preventDefault();
          console.log("invoking url ", this.router.url);
        }
      });

I am struggling to successfully disable the device back-button. Any assistance or guidance would be greatly appreciated.

angular typescript ionic-framework ionic4 angular-router

Answer 1

Answer №1


launchApplication() {
    this.platform.ready().then(() => {
      this.platform.backButton.subscribeWithPriority(9999, () => {
        document.addEventListener('backbutton', function (event) {
          event.preventDefault();
          event.stopPropagation();
          console.log('greetings');
        }, false);
      });
      this.statusBar.styleDefault();
    });
  }

Answer 2


launchApplication() {
    this.platform.ready().then(() => {
      this.platform.backButton.subscribeWithPriority(9999, () => {
        document.addEventListener('backbutton', function (event) {
          event.preventDefault();
          event.stopPropagation();
          console.log('greetings');
        }, false);
      });
      this.statusBar.styleDefault();
    });
  }

Answer 3

Answer №2

Revamp

The backButton event listeners have been upgraded to follow the RxJS observables paradigm, resulting in a change in implementation:

const backButtonSubscription = this.platform.backButton
        .subscribeWithPriority(9999, () => {
              // Perform actions when back button is tapped
        }));

...

// Reverting back button to its previous state
backButtonSubscription.unsubscribe();

You may consider declaring backButtonSubscription as a class property for accessibility across other class methods.

Enhanced Version

I discovered a solution for reverting back to the original functionality (previous state of the back button):

Your observer is added to the

this.platform.backButton.observers

array. Simply remove the last element from the list:

this.platform.backButton.observers.pop();

This insight could be beneficial for someone facing a similar challenge.

Answer 4

Revamp

The backButton event listeners have been upgraded to follow the RxJS observables paradigm, resulting in a change in implementation:

const backButtonSubscription = this.platform.backButton
        .subscribeWithPriority(9999, () => {
              // Perform actions when back button is tapped
        }));

...

// Reverting back button to its previous state
backButtonSubscription.unsubscribe();

You may consider declaring backButtonSubscription as a class property for accessibility across other class methods.

Enhanced Version

I discovered a solution for reverting back to the original functionality (previous state of the back button):

Your observer is added to the

this.platform.backButton.observers

array. Simply remove the last element from the list:

this.platform.backButton.observers.pop();

This insight could be beneficial for someone facing a similar challenge.

Answer 5

Answer №3

02-05-2020

This solution works perfectly for my needs.

app.component.ts

async initializeApp(): Promise<void> {
    await this.platform.ready();
   
    this.platform.backButton.subscribeWithPriority(1, () => { // disabling the hardware back button on the entire app
    });

  }

Answer 6

02-05-2020

This solution works perfectly for my needs.

app.component.ts

async initializeApp(): Promise<void> {
    await this.platform.ready();
   
    this.platform.backButton.subscribeWithPriority(1, () => { // disabling the hardware back button on the entire app
    });

  }

Answer 7

Answer №4

If you want to disable the hardware back button for certain pages in Ionic 4, you can use the following code snippet:

 ionViewDidEnter() {
    this.backButtonAction = this.platform.backButton.observers.pop();
}

ionViewWillLeave() {
    this.platform.backButton.observers.push(this.backButtonAction);
}

Answer 8

If you want to disable the hardware back button for certain pages in Ionic 4, you can use the following code snippet:

 ionViewDidEnter() {
    this.backButtonAction = this.platform.backButton.observers.pop();
}

ionViewWillLeave() {
    this.platform.backButton.observers.push(this.backButtonAction);
}

Answer 9

Answer №5

I have discovered a more effective method to prevent the back button on a device, allowing you to disable it on any page of your choice.

import { Router, NavigationEnd } from '@angular/router';

@Injectable({
  providedIn: 'root'
})
export class DisableBackService {
  // Specify pages where back button should be disabled
  private blackLists: string[] = ['/tab/wall', '/event-list', '/tutorial', '/offline-message'];

  constructor(private router: Router) {
    // Subscribe to router events for page changes
    this.router.events.subscribe((ev) => {
      if (ev instanceof NavigationEnd) {
        const blackList = this.blackLists.find(el => ev.url.includes(el));
        if (blackList) {
          this.disableBack();
        } else {
          this.enableBack();
        }
      }
    });
  }

  private logger() {
    console.log('Back button disabled');
  }

  disableBack() {
    document.addEventListener('backbutton', this.logger, false);
  }

  enableBack() {
    document.removeEventListener('backbutton', this.logger, false);
  }
}

Answer 10

I have discovered a more effective method to prevent the back button on a device, allowing you to disable it on any page of your choice.

import { Router, NavigationEnd } from '@angular/router';

@Injectable({
  providedIn: 'root'
})
export class DisableBackService {
  // Specify pages where back button should be disabled
  private blackLists: string[] = ['/tab/wall', '/event-list', '/tutorial', '/offline-message'];

  constructor(private router: Router) {
    // Subscribe to router events for page changes
    this.router.events.subscribe((ev) => {
      if (ev instanceof NavigationEnd) {
        const blackList = this.blackLists.find(el => ev.url.includes(el));
        if (blackList) {
          this.disableBack();
        } else {
          this.enableBack();
        }
      }
    });
  }

  private logger() {
    console.log('Back button disabled');
  }

  disableBack() {
    document.addEventListener('backbutton', this.logger, false);
  }

  enableBack() {
    document.removeEventListener('backbutton', this.logger, false);
  }
}

Answer 11

Answer №6

One interesting approach is to utilize capacitor to manage the back button functionality. This will involve disabling the default behavior of the back button, as outlined in the documentation:

    /**
     * By listening for the hardware back button event (specific to Android), you can disable the
     * standard back button behavior. In such cases, you may need to manually trigger `window.history.back()`.
     * To close the application, consider using `App.exitApp()`.
     */
    addListener(eventName: 'backButton', listenerFunc: (data: AppUrlOpen) => void): PluginListenerHandle;

Here's an example of how this can be implemented:

import { Plugins, AppState } from '@capacitor/core';

const { App } = Plugins;

App.addListener('backButton', (data: AppUrlOpen) => {
  console.log('The user pressed the back button, overriding default behavior.');
});

Answer 12

One interesting approach is to utilize capacitor to manage the back button functionality. This will involve disabling the default behavior of the back button, as outlined in the documentation:

    /**
     * By listening for the hardware back button event (specific to Android), you can disable the
     * standard back button behavior. In such cases, you may need to manually trigger `window.history.back()`.
     * To close the application, consider using `App.exitApp()`.
     */
    addListener(eventName: 'backButton', listenerFunc: (data: AppUrlOpen) => void): PluginListenerHandle;

Here's an example of how this can be implemented:

import { Plugins, AppState } from '@capacitor/core';

const { App } = Plugins;

App.addListener('backButton', (data: AppUrlOpen) => {
  console.log('The user pressed the back button, overriding default behavior.');
});

Answer 13

Answer №7

How to prevent the hardware back button from functioning while using LoadingController in Ionic 5. I have combined and implemented solutions from two different answers into my loading controller code.

import {
        LoadingController,
        Platform
    } from '@ionic/angular';
    constructor(public platform: Platform, private loadingController: LoadingController) {}

async presentLoading() {
    this.platform.backButton.subscribeWithPriority(10, () => {
        document.addEventListener('backbutton', () => {}, false);
    });
    const loading = await this.loadingController.create({
        spinner: 'circles',
        keyboardClose: true,
        message: 'Please Wait'
    }).then((res) => {

        res.onDidDismiss().then((d) => {
            this.platform.backButton.observers.pop();
        })
        return res.present()
    })
    return loading;
}

Answer 14

How to prevent the hardware back button from functioning while using LoadingController in Ionic 5. I have combined and implemented solutions from two different answers into my loading controller code.

import {
        LoadingController,
        Platform
    } from '@ionic/angular';
    constructor(public platform: Platform, private loadingController: LoadingController) {}

async presentLoading() {
    this.platform.backButton.subscribeWithPriority(10, () => {
        document.addEventListener('backbutton', () => {}, false);
    });
    const loading = await this.loadingController.create({
        spinner: 'circles',
        keyboardClose: true,
        message: 'Please Wait'
    }).then((res) => {

        res.onDidDismiss().then((d) => {
            this.platform.backButton.observers.pop();
        })
        return res.present()
    })
    return loading;
}

How to prevent or disable the hardware back button on an Ionic 4 device

Answer №1

Answer №2

Revamp

Enhanced Version

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

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