Angular: Using ViewChild and Input at the Same time, Side Effects or Best practice?

Question

Would there be any errors or collision if using ViewChild and Input at the same time? Or is it recommended practice in general?

Currently h

Answer 1

The link you indicate is a bit old. In my opinion, the use of viewChild is usefull when we want to use a method or function of the child(*), or change his aspect. For control a variable or a FormGroup or formControl my best bet is use @Input.

Remember that, when we pass an object to a child in a Input, there are an unique object, so parent and children has the value when any change happens -in children or in parent-, e.g. if we pass a FormGroup, you can mark as touched, remove/add validators, use setValue... from parent or form children. About @Input is true that if you has a "input fixed" -you pass a variable that not change- ,as

<child greet="Hello word"></child>

You should use @Attribute in constructor, NOT input

constructor(@Attribute('greet') greet){}

(*)you can use a input with a setter, but in this case I like much more use viewChild or a variable reference