Hardware Back button , subscribeWithPriority returning void for processNexthandler

[RohitBattepati]

When trying to call multiple handlers with same priority using processNextHandler, returning the void error stated below

Argument of type '(processNextHandler: any) => void' is not assignable to parameter of type '() => void | Promise<any>'

any fix for this?

[rapropos]

Please post the code you have written that triggers this error.

[RohitBattepati]

Please check below code

both these handlers are in different files and i want to run one after the other.

import { Platform } from "@ionic/angular";

this.platform.backButton.subscribeWithPriority(5, ( ) => {
			if (){
                               // do something
                          }

		});


this.platform.backButton.subscribeWithPriority(10, (processNextHandler) => {
			if (){
                               // do something
                          }

			processNextHandler();
		});

[rapropos]

Any chance you’re using a framework version older than 5.1.0? That’s when the feature you’re trying to use was added.

[RohitBattepati]

You are right, the ionic framework version is 4.11.5 and ionic cli version is 5.4.16.
Thanks for checking.

[RRVieira]

@RohitBattepati

want to run one

Hi, I was post a question with the same issue, I see the same message for processNextHandler, below the package. Do I have to update?

Ionic:

Ionic CLI : 5.4.16
Ionic Framework : @ionic/angular 5.0.7
@angular-devkit/build-angular : 0.1002.0
@angular-devkit/schematics : 10.1.7
@angular/cli : 10.0.1
@ionic/angular-toolkit : 2.3.3

Cordova:

Cordova CLI : not installed
Cordova Platforms : 6.0.0, android 8.1.0, browser, ios 5.1.1
Cordova Plugins : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 4.2.1, (and 7 other plugins)

Utility:

cordova-res : not installed
native-run : not installed

System:

NodeJS : v14.15.0 (C:\Program Files\nodejs\node.exe)
npm : 6.14.8
OS : Windows 10

[RohitBattepati]

Yes , update ionic framework to version 5 and processNextHandler is accessible.

[rapropos]

@RRVieira

Do I have to update?

@rapropos

Any chance you’re using a framework version older than 5.1.0?

@RRVieira

Ionic Framework : @ionic/angular 5.0.7

Looks that way to me.

[RRVieira]

Thanks for your reply…
I tried many ways, no success

npm update -g ionic
npm uninstall -g ionic 
npm install -g ionic
npm update -g @ionic/angular

Sorry, first PWA… could you suggest how to update?

[rapropos]

All the things you mentioned only deal with the CLI. You need to update the framework in your project. I usually just manually edit package.json and rerun npm i.

[RRVieira]

@RRVieira

Ionic Framework

Thanks my friend… I just updated the version… Now I will work on this issue.

[RRVieira]

Hi dear… could you give one more help by now? I´m stuck trying to work hardware back button on PWA. According to ionic documentation there is no support for that. Maybe is there another solution? I tried the code below, just to alert and check button pressed is handled, but not working.

directly on feed.page.ts, last page before leaving the APP.

this._Platform.backButton.subscribeWithPriority(666666, (processNextHandler) => {
if (window.confirm(“Do you want to exit APP”)) {
alert(‘OK’);
}
});

Thanks in advanced

[Dipesh_jayswal]

@RRVieira

this._Platform.backButton.subscribeWithPriority(666666, (processNextHandler) => {
if (window.confirm(“Do you want to exit APP”)) {
alert(‘OK’);
}
});

Thank you