CODEWITHSUNDEEP
javascriptangulartypescript
Junaid
Junaid

Reputation: 674

Angular : How to get value in html passing to other component?

I'm trying to send value which I'm getting from web service to another component but the problem is that I'm getting empty value in that another component while I can see that the value is present when I do console.log() in the current component.

AppComponent

ts

level: string = '';

getCustomer(id: string) {
    this.isLoading = true;

        this.customerService.getOne(id)
            .subscribe(
                (data) => {
                    this.level = data.level;
                    console.log(this.level); // Here I can see the value
                },
                (error) => {
                    this.errorMessage = error;
                },
            );
      }

html

    <div class="col-lg-8">
      <app-other-component [active]="level"></app-other-component> 
    </div>

AppOtherComponent

ts

@Input() active: string;

ngOnInit() {
    console.log(this.active); // Here I'm getting an empty string
  }

I think that this line is executing <app-other-component [active]="level"></app-other-component>before the value of 'level' is even filled.

How can I resolve this? thanks.

Upvotes: 2

Views: 1400

Answers (2)

SiddAjmera
SiddAjmera

Reputation: 39482

Try wrapping the div in an *ngIf, if you don't want the app-other-component to be visible before the value is set from the web service:

<div class="col-lg-8" *ngIf="level">
  <app-other-component [active]="level"></app-other-component> 
</div>

And yeah as Yousef suggested, you will get the updated @Input value in ngOnChanges and NOT IN ngOnInit. ngOnChanges is the function that gets called on a component every time one of its @Input property changes. So you'll get the updated @Input property in there:

@Input() active: string;

ngOnChanges() {
  console.log(this.active); // Here You'll get the updated `active` string.
}

Upvotes: 4

Andrey
Andrey

Reputation: 2078

I guess that is because of 'this' pointer in callback function (which does not point to the component). Change it to 'self' like that

let self = this;
this.customerService.getOne
...
(data) => { self.level = data.level; }

Upvotes: 0

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