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I have implemented a same component more than once in one of my forms. I have to send data from parent to child components. I know that it can be achieved with @input or with viewchild. what is the performance issue of using one over the other? when should i use viewchild or input?

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  • I hope that view child is best one instead of input.check with Behavioural subject is updated all child components . Commented Dec 18, 2018 at 1:42
  • Can anyone explain how internally in angular it makes difference in using @I/O vs viewChild. Else usecases or scenarios will be helpful to understand when its best to use what. Commented Dec 19, 2018 at 17:49

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When you are using @Input(), for every change the ngOnChanges() will be called and causes more noise.

Using ViewChild() will not create any such noise. So, prefer using Viewchild over @Input()

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8 Comments

1 way data binding sets the value to the object.
What do you mean by 1 way data binding sets the value to the object?
you have any prior knowledge about angular?
I know what is one way binding, why do you mention that here in the comment
Why not use input setter over viewChild?
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