src/app/messages.service.ts


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

@Injectable({
  providedIn: 'root'
})
export class MessagesService {

  private error:string;

  constructor() { }

  getError() :string{
    return this.error;
  }

  pushError(errorText:string){
    this.error = errorText;
  }

  dismissError(){
    this.error='';
  }
}