J'apprends Ionic 3 et je reçois cette erreur en essayant de faire un validateur personnalisé qui vérifie un unique Nom d'utilisateur. J'ai fait de mon mieux mais je n'ai pas pu résoudre ce problème.Comment résoudre "Erreur: Uncaught (en promesse): Erreur: Aucun fournisseur pour" erreur dans Ionic 3
CustomValidators.ts
import { Directive, Input } from '@angular/core';
import { FormControl, Validator, AbstractControl } from '@angular/forms';
import { Http, Response, Headers, RequestOptions } from '@angular/http';
import {Observable} from 'rxjs/Rx';
export class CustomValidators {
constructor(public http: Http){}
public hasUniqueEmail(
control: FormControl,
){
return this.http.get('assets/users.json')
.map(res => res.json())
.catch((error:any) => Observable.throw(error.json().error || 'Server error'));
}
}
signup.ts
import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { CustomValidators } from '../../components/CustomValidators';
/**
* Generated class for the SignupPage page.
*
* See http://ionicframework.com/docs/components/#navigation for more info
* on Ionic pages and navigation.
*/
@IonicPage()
@Component({
selector: 'page-signup',
templateUrl: 'signup.html',
})
export class SignupPage {
private sform : FormGroup;
constructor(
private formBuilder: FormBuilder,
private myValidator: CustomValidators,
){
this.sform = this.formBuilder.group({
name: ['', Validators.compose([Validators.maxLength(30), Validators.pattern('[a-zA-Z ]*'), Validators.required])],
email: ['', Validators.compose([Validators.email,this.myValidator.hasUniqueEmail])],
password: ['',Validators.required ],
});
}
logForm() {
}
}
C'est l'erreur que je reçois:
"Uncaught (in promise): Error: No provider for CustomValidators!
Error
at Error (native)
at injectionError (http://localhost:8100/build/main.js:1583:86)
at noProviderError (http://localhost:8100/build/main.js:1621:12)
at ReflectiveInjector_._throwOrNull (http://localhost:8100/build/main.js:3122:19)
at ReflectiveInjector_._getByKeyDefault (http://localhost:8100/build/main.js:3161:25)
at ReflectiveInjector_._getByKey (http://localhost:8100/build/main.js:3093:25)
at ReflectiveInjector_.get (http://localhost:8100/build/main.js:2962:21)
at NgModuleInjector.get (http://localhost:8100/build/main.js:3909:52)
at resolveDep (http://localhost:8100/build/main.js:11369:45)
at createClass (http://localhost:8100/build/main.js:11225:91)"
Est-ce que 'CustomValidators' est un composant, un service, un tube ... qu'est-ce que la classe est censée représenter? – Baruch