Angular ViewChild error Expected 2 arguments but got 1

Question

When trying ViewChild I am getting the error  Error is  An argument for  opts  was not provided    Both  ViewChild is giving the error   import   Component  OnInit  ElementRef  ViewChild  Output  EventEmitter   from   angular core   import   Ingredient   from  src app shared ingredient model     Component     selector   app-shopping-edit     templateUrl     shopping-edit component html     styleUrls      shopping-edit component css      export class ShoppingEditComponent implements OnInit     ViewChild  nameInput   nameInputRef  ElementRef   ViewChild  amountInput   amountInputRef  ElementRef   Output   ingredientAdded   new EventEmitter lt Ingredient gt       constructor         ngOnInit            onAddItem         const ingName   this nameInputRef nativeElement value      const ingAmount   this amountInputRef nativeElement value      const newIngredient   new Ingredient ingName  ingAmount       this ingredientAdded emit newIngredient               ts 11 2   error TS2554  Expected 2 arguments  but got 1

User · Answer

In Angular 8  ViewChild always takes 2 param  and second params always has  static  true or static  false  You can try like this    ViewChild  nameInput    static  false   component   Also the static  false is going to be the default fallback behaviour in Angular 9    What are static false true  So as a rule of thumb you can go for the following      static  true   needs to be set when you want to access the ViewChild in ngOnInit     static  false   can only be accessed in ngAfterViewInit  This is also what you want to go for when you have a structural directive  i e   ngIf  on your element in your template

User · Answer

Angular 8 In Angular 8  ViewChild has another param  ViewChild  nameInput    static  false   component   Component  You can read more about it here and here Angular 9  amp  Angular 10 In Angular 9 default value is static  false  so doesn t need to provide param unless you want to use  static  true

User · Answer

Use this      ViewChild ChildDirective   static  false   Component

User · Answer

That also resolved my issue    ViewChild  map    static  false   googleMap

User · Answer

Regex for replacing all via IDEA  tested with Webstorm   Find    ViewChild            Replace    ViewChild    1     static  true

User · Answer

In Angular 8   ViewChild takes 2 parameters     ViewChild ChildDirective   static  false   Component

User · Answer

In Angular 8  ViewChild has another param  ViewChild  nameInput    static  false   component I resolved my issue like below  ViewChild MatSort   static  false   sort  MatSort

User · Answer

In Angular 8   ViewChild takes 2 parameters  Try like this   ViewChild  nameInput     static  false    nameInputRef  ElementRef   Explanation     static  false    If you set static false  the child component ALWAYS gets initialized after the view initialization in time for the ngAfterViewInit ngAfterContentInit callback functions     static  true   If you set static true  the child component initialization will take place at the view initialization at ngOnInit By default you can use   static  false    If you are creating a dynamic view and want to use the template reference variable  then you should use    static  true  For more info  you can read this article  Working Demo  In the demo  we will scroll to a div using template reference variable    ViewChild  quot scrollDiv quot     static  true    scrollTo  ElementRef   With   static  true    we can use this scrollTo nativeElement in ngOnInit  but with   static  false     this scrollTo will be undefined in ngOnInit   so we can access in only in ngAfterViewInit

User · Answer

Try this in angular 8 0   ViewChild  result   static  false   resultElement  ElementRef

User · Answer

it is because view child require two argument try like this      ViewChild  nameInput     static  false     nameInputRef  ElementRef        ViewChild  amountInput     static  false     amountInputRef    ElementRef

User · Answer

you should use second argument with ViewChild like this    ViewChild  eleDiv     static  false    someElement  ElementRef

[angular] Angular @ViewChild() error: Expected 2 arguments, but got 1

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