Go back with router link throw error in router?

Question

Hi When I click on send message button code working fine with router but when I click there on goback link the code sends error on console and it stops.

You can check in stackbliz of my edit link as : https://stackblitz.com/edit/angular2-communicating-between-components-qjhrpu?file=app%2Ffeedback%2Ffeedback.component.html

I've voted to close, because the code is no longer available at the provided link. — David Walschots, Jan 05 '19 at 10:33

score 1 · Answer 1 · answered Dec 28 '18 at 08:59

1

You have to affect your subscription otherwise your this.subscription is undefined.

ngOnInit() {
  this.subscription = this.messageService.getNewUserInfo().subscribe(info => {
    this.message = info;
    console.log("here",info);
  })
}

answered Dec 28 '18 at 08:59

Johan Rin

1,900
2
20
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To manage you subscription, you should take a look at this post: [https://stackoverflow.com/questions/38008334/angular-rxjs-when-should-i-unsubscribe-from-subscription](https://stackoverflow.com/questions/38008334/angular-rxjs-when-should-i-unsubscribe-from-subscription) – Johan Rin Dec 28 '18 at 12:28

score 1 · Accepted Answer · answered Dec 28 '18 at 09:12

1

first you have to subscribe assign value to this.subscription.

ngOnInit() {
  this.subscription = this.messageService.getNewUserInfo().subscribe(info => {
    this.message = info;
    console.log("here",info);
  })
}

After that also check on it's value on ngOnDestroy.

ngOnDestroy() {
    // unsubscribe to ensure no memory leaks
    if(this.subscription) {
      this.subscription.unsubscribe();
    }
  }

answered Dec 28 '18 at 09:12

Abhishek

1,742
2
14
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Yes Abhishek it also need to check as after back message are taken in memory..Thanks you!! – Ganny Dec 28 '18 at 09:19

Go back with router link throw error in router?

2 Answers2