Ionic 2: Issue with Custom Provider Resulting in "Unable to Resolve All Parameters"

I have created a test provider and I am attempting to inject it into two pages for the purpose of sharing data and methods. However, when I add the provider to the page constructor, an error is thrown, stating "Can't resolve all parameters for CharacterPage: (NavController, NavParams, ?)".

Ionic Framework: 2.0.1
Ionic Native: 2.4.1
Ionic App Scripts: 1.1.0
Angular Core: 2.2.1
Angular Compiler CLI: 2.2.1
Node: 6.9.4
OS Platform: Windows 10
Navigator Platform: Win32

app.module.ts

import { NgModule, ErrorHandler } from '@angular/core';
import { IonicApp, IonicModule, IonicErrorHandler } from 'ionic-angular';
import { Storage } from '@ionic/storage';
import { MyApp } from './app.component';
import { BookNavigation } from '../providers/book-navigation';

@NgModule({
  declarations: [   //STUFF   ],
  imports: [ IonicModule.forRoot(MyApp)  ],
  bootstrap: [IonicApp],
  entryComponents: [  //STUFF ],
  providers: [
    {
    provide: ErrorHandler, 
    useClass: IonicErrorHandler,
    },
    Storage, 
    BookNavigation,
    ]
})
export class AppModule {}

app.components.ts

import { Component } from '@angular/core';
import { Platform } from 'ionic-angular';
import { StatusBar, Splashscreen } from 'ionic-native';
import { BookNavigation } from '../providers/book-navigation';
import { HomePage } from '../pages/home/home';


@Component({
  templateUrl: 'app.html',
  providers: [BookNavigation]
})
export class MyApp {
  rootPage = HomePage;
  constructor(platform: Platform) {
    platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      StatusBar.styleDefault();
      Splashscreen.hide();
    });

}

characterPage.ts

import { Component } from '@angular/core';
import { NavController, NavParams } from 'ionic-angular';
import { BookNavigation } from '../../providers/book-navigation';

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

  constructor(public navCtrl: NavController, 
              public navParams: NavParams, 
              public bookNavigation: BookNavigation) {}

}

Service Provider

import { Injectable } from '@angular/core';
import { Component } from '@angular/core';
import { NavController, NavParams } from 'ionic-angular';
import { Storage } from '@ionic/storage';

@Injectable()
export class BookNavigation {

  constructor(public navCtrl: NavController, public navParams: NavParams, public storage:Storage) {
    console.log('Hello BookNavigation Provider');
  }

}

Answer №1

Consider utilizing forwardRef to resolve the issue. It appears that the BookNavigation Service is creating a loop of dependencies with certain imports. When dealing with CharacterPage,

 constructor(public navCtrl: NavController, 
              public navParams: NavParams, 
              @Inject(forwardRef(() =>BookNavigation)bookNavigation: BookNavigation) {}

Answer №2

I've come across some valuable information here. It seems using a service for navigation purposes is not advisable (refer to this link ). This can lead to errors and other complications, so I've opted to steer clear of the idea. I'm still pondering on how to work around this issue and consolidate all my data and methods in one file while maintaining clean code. I've heard that utilizing event emitters might be the best approach, but I need to delve deeper into them before making a final decision.

Answer №3

The issue arose for me due to my selection of a provider that wasn't completely accurate, although the provider itself was not at fault. Once I eliminated the provider from my component, everything worked perfectly.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Observable - initiating conditional emission

How can I make sure that values are emitted conditionally from an observable? Specifically, in my scenario, subscribers of the .asObservable() function should only receive a value after the CurrentUser has been initialized. export class CurrentUser { ...

Using Typescript and Next.js to handle error messages returned from Axios responses

My Next.js application makes an API call to validate a registration form. The server returns error messages in the following format: {"message":"The given data was invalid.","errors":{"email":["The email has alr ...

Executing installed packages using npm: A step-by-step guide

Recently, I have encountered a confusing issue in my coding journey. In Python, I got used to installing packages and using them right away without any hiccups. For example, with SpotDL, everything worked seamlessly. However, things took a different turn w ...

Creating a dual-element display in React within a single frame

My code looks like this: <Box> <SomeIcon/> <HightlightSearch query={query}> {text} </HightlightSearch> </Box> The HighlightSearch function uses innerHTML to highlight query results in the child (text). It's a simpl ...

Enhance your React application by using a personalized hook that allows you to trigger a function

After creating a custom hook to handle uploads to an AWS S3 bucket, I encountered a small issue. Rather than having the hook execute the logic directly, I decided to create an executable function to return instead. However, I am facing a problem where the ...

Display additional json elements as you scroll down

The total number of JSON objects is 100. Initially display the first set of 20 objects. As you scroll down, the next 20 objects will be shown. This process continues until all 100 objects have been displayed. ...

The 'component' property is not found in the 'IntrinsicAttributes' type in this context

I am facing an issue with a component that is not compiling properly: export default function MobileNav({routes, currentRouteIndex, handlePressedRoutedIndex}: MobileNavProp) { ... return ( <React.Fragment> ... ...

Quietly renewing leads to OAuthErrorEvent with the type "silent_refresh_timeout" and no information on the reason or params

Upon calling the connect/authorize endpoint for silent renew, it triggers the silent_renew.html file. However, the log is showing an OAuthErrorEvent with type: "silent_refresh_timeout", reason: null, params: null. I am utilizing an angular client with the ...

Update the icon in real-time based on the text with Angular 8 and Font Awesome, achieving dynamic changes effortlessly

I need to dynamically change the icon based on the value within a span element. Here is the HTML structure: The version text will only have two possible values: If the value is "Active", then a success icon should be displayed. If the value is "Inactive ...

Error in Typescript occurring with a custom typography element

I recently developed a simple typography component for my React project and it's causing a Typescript error that's puzzling me a bit. Typography Component Code import clsx from 'clsx'; const sizeVariants = { h1: 'h1', ...

Typescript error: The value "X" cannot be assigned to this type, as the properties of "Y" are not compatible

Disclaimer: I am relatively new to Angular2 and typescript, so please bear with me for any errors. The Challenge: My current task involves subtracting a start date/time from an end date/time, using the result in a formula for my calculation displayed as " ...

Exploring Angular 17's unique approach to structuring standalone components

Is something wrong with my code if I can only see the footer, header, and side-nav components on localhost? How can I fix this? app.component.html <div class="container-fluid"> <div class="row"> <div class=&q ...

Encountering a CORS error while attempting to initiate a Github API call on my Next App

I'm currently developing a Next.js React app with TypeScript and I am wondering if I need a server to make requests to the GitHub API. In my next.config.mjs file, as shown below, the only task my app needs is to fetch content from a file in a public r ...

The URL is reverted back to the previous address

Currently in the process of developing an Angular application, I've encountered a minor visual issue. On one of the pages, there is a ReactiveForm implemented, but whenever I navigate to that page, the URL reverts back to the previous one (even though ...

Compilation in TypeScript taking longer than 12 seconds

Is anyone else experiencing slow TypeScript compilation times when building an Angular 2 app with webpack and TypeScript? My build process takes around 12 seconds, which seems excessively slow due to the TypeScript compilation. I've tried using both ...

In TypeScript, inferring argument types

Here is the code snippet in question: type Inferred<T> = T extends (...args: (infer UnionType)[]) => any ? UnionType : never function f(first: 'first', second: 'second', bool: boolean) {} type T = Inferred<typeof f> // ...

The never-ending cycle of an Angular dropdown linked to a function being repeatedly invoked

I am currently working with a PrimeNg dropdown that is fetching its options through a function call. However, I have noticed that this function is being called an excessive number of times. Could this potentially impact the performance or any other aspect? ...

Encountering issues with the command npm install --save web-animations-js, the

Issue encountered while trying to run "npm install --save web-animations-js". It seems like the request to https://registry.npmjs.org/web-animations-js failed due to a mismatch in the Hostname/IP in the certificate. The error message indicates that the Hos ...

The FormGroup instance does not return any input method when using the get input function

I am facing an issue where a custom error message should only display if the input for foo is invalid. However, it seems like the line of code myForm.get('foo') is returning null. Below is the simplified version of component.html: <form [for ...

Expanding the property of an established type to a nested type

Let's talk about titles. Well, maybe not this one. I tried to come up with a good title, but it didn't work out as planned. In my coding journey, I have created a cool interface called DefaultTheme: export interface DefaultTheme { colors: ...