Pass data to other component using service in angular2

Question

I'm trying to pass data from 'first' component to 'second' component using service. But When I try to retrieve data in 'second' component, It is undefined.

This is my code.

import { Component, OnInit } from '@angular/core';
import {Router} from "@angular/router";
import { testData } from '../model/Data';
@Component({
  selector: 'app-first',
  templateUrl: './first.component.html',
  styleUrls: ['./first.component.css']
})
export class FirstComponent implements OnInit {
 public constructor(private router: Router,private mydata:testData) { 
    this.mydata={firstname:"Amit",lastname:"Kumar",Mobile:"12345"};
 }
ngOnInit() { }
}

As I have set 'myData' in constructor. This is code in 'second' component.

import { Component, OnInit } from '@angular/core';
import {Router} from "@angular/router";
import { testData } from '../model/Data';
@Component({
  selector: 'app-second',
  templateUrl: './second.component.html',
  styleUrls: ['./second.component.css']
})
export class SecondComponent implements OnInit {
  public constructor(private mydata:testData) {
    console.log(this.mydata.firstname);
   }
  ngOnInit() {}
}

Data.ts

import { Injectable } from '@angular/core';
@Injectable()
export class testData{
    public firstname: string;
    public lastname: string;
    public Mobile:string;
    public constructor() { }
}

and updated my app.module.ts file

@NgModule({
...
providers: [testData],
  bootstrap: [AppComponent]
})

'Second' component is not child component of 'first'.

angular.io/docs/ts/latest/cookbook/component-communication.html — eko
– eko, Commented Mar 3, 2017 at 4:55
@echonax: Those example for component when there is parent child relationship. — Amit Kumar
– Amit Kumar, Commented Mar 3, 2017 at 4:58
Title is a bit misleading but your answer is in Parent and children communicate via a service — eko
– eko, Commented Mar 3, 2017 at 4:59
@echonax: I read that tutorial. But could find my mistake. As My service is singleton. so I should get same instance in 'second' controller. Could you please point out my mistake. — Amit Kumar
– Amit Kumar, Commented Mar 3, 2017 at 5:15

eko · Accepted Answer · 2017-03-03 05:19:32Z

When you do this assignment

this.mydata={firstname:"Amit",lastname:"Kumar",Mobile:"12345"};

You are not assigning the properties of your service. You are assigning you mydata field to become an another object.

I think what you meant to do is,

this.mydata.firstname = "Amit";
this.mydata.lastname = "Kumar";
this.mydata.Mobile = "12345";

If you want to refer to the whole object you should use a Subject like in the documentation:

https://angular.io/docs/ts/latest/cookbook/component-communication.html

Note: This approach still might not work in some cases; like if FirstComponent can't set the fields fast enough and SecondComponent tries to get them before..

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