Utilizing a method from a separate class in Ionic 2

Having trouble using the takePicture() function from camera.ts in my home.ts. I keep getting an error message saying "No provider for CameraPage!" Any assistance on how to resolve this issue would be greatly appreciated, as I am new to this language and just started learning it a few days ago.

home.ts

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import {NavParams} from 'ionic-angular';
import { CameraPage } from '../../pages/camera/camera';

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

 constructor(public navCtrl: NavController,public navParams: NavParams,      private camera: CameraPage) {

}

 goCam(){

this.camera.takePicture();


}

}

camera.ts

import { Component } from '@angular/core';
import {Camera} from 'ionic-native';
import { NavController } from 'ionic-angular';


@Component({

templateUrl: 'camera.html'
})
export class CameraPage {
public base64Image: string;
constructor(public navCtrl: NavController) {


 }

takePicture(){
 Camera.getPicture({
   destinationType: Camera.DestinationType.DATA_URL,
   targetWidth: 1000,
   targetHeight: 1000
 }).then((imageData) => {
   // imageData is a base64 encoded string
   this.base64Image = "data:image/jpeg;base64," + imageData;
 }, (err) => {
   console.log(err);
  });
}

 ionViewWillEnter(){
  this.takePicture();
}

 }

tabs.ts

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

import { HomePage } from '../home/home';
import { CameraPage } from '../camera/camera';
import { ContactPage } from '../contact/contact';

@Component({
  templateUrl: 'tabs.html'
})
export class TabsPage {
  // this tells the tabs component which Pages
  // should be each tab's root Page
  tab1Root: any = HomePage;
  tab2Root: any = CameraPage;
  tab3Root: any = ContactPage;

  constructor() {

  }
}

Answer №1

In order to pass functionality from one Page to another, you cannot simply instantiate it in the constructor like with a provider.

Instead, create a provider or service class (such as camera.service.ts) that contains the method takePicture. This way, both pages can access and utilize this shared functionality. It is recommended for Pages to not hold any state that needs to be shared across different Pages.

The error mentioned occurs because all providers must be listed in the providers section of the app.module.ts file. Ionic looks for the provider within this list when trying to access functionality from one Page to another, so ensure that the necessary providers are included in this section.

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