registering a back button action in Ionic2 for multiple pages

Question

registering a back button action in Ionic2 for multiple pages

Currently, I am in the process of developing my Ionic2 app and have encountered a dilemma regarding the functionality of registerBackButtonAction.

On one page, let's call it pageA, I have implemented this function and everything is functioning as expected:

this.platform.registerBackButtonAction(() => {
     console.log("back presed");
    this.abortDownloadAndExit();
    });

However, when attempting to perform a different action on registerBackButtonAction on another page, say PageB, Ionic seems to be pulling the action from PageA instead.

I am now seeking guidance on how to register unique actions for specific pages. Any assistance would be greatly appreciated.

angular typescript ionic-framework ionic2 ionic3

Answer 1

Answer №1

According to the information provided in the Ionic documentation, the function registerBackButtonAction returns a function:

This function, when invoked, will unregister its back button action. This allows you to restore the default behavior upon leaving the page, as demonstrated below:

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

@Component({
    selector: 'page-home',
    templateUrl: 'home.html'
})
export class HomePage {

    // Store the callback of the event handler to unsubscribe when leaving the page
    public unregisterBackButtonAction: any;

    constructor(...) { ... }

    ionViewDidEnter() {
        this.initializeBackButtonCustomHandler();
    }

    ionViewWillLeave() {
        // Unregister the custom back button action for this page
        this.unregisterBackButtonAction && this.unregisterBackButtonAction();
    }

    public initializeBackButtonCustomHandler(): void {
        this.unregisterBackButtonAction = this.platform.registerBackButtonAction(() => {
            this.customHandleBackButton();
        }, 10);
    }

    private customHandleBackButton(): void {
        // Implement necessary actions here ...
    }
}

Therefore, it is essential to save the callback of the registerBackButtonAction method and utilize it when needed, such as when exiting the page or restoring the default functionality:

this.unregisterBackButtonAction = this.platform.registerBackButtonAction(() => {
    this.customHandleBackButton();
}, 10);

Answer 2

According to the information provided in the Ionic documentation, the function registerBackButtonAction returns a function:

This function, when invoked, will unregister its back button action. This allows you to restore the default behavior upon leaving the page, as demonstrated below:

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

@Component({
    selector: 'page-home',
    templateUrl: 'home.html'
})
export class HomePage {

    // Store the callback of the event handler to unsubscribe when leaving the page
    public unregisterBackButtonAction: any;

    constructor(...) { ... }

    ionViewDidEnter() {
        this.initializeBackButtonCustomHandler();
    }

    ionViewWillLeave() {
        // Unregister the custom back button action for this page
        this.unregisterBackButtonAction && this.unregisterBackButtonAction();
    }

    public initializeBackButtonCustomHandler(): void {
        this.unregisterBackButtonAction = this.platform.registerBackButtonAction(() => {
            this.customHandleBackButton();
        }, 10);
    }

    private customHandleBackButton(): void {
        // Implement necessary actions here ...
    }
}

Therefore, it is essential to save the callback of the registerBackButtonAction method and utilize it when needed, such as when exiting the page or restoring the default functionality:

this.unregisterBackButtonAction = this.platform.registerBackButtonAction(() => {
    this.customHandleBackButton();
}, 10);

registering a back button action in Ionic2 for multiple pages

Answer №1

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