Angular 2 and beyond: Accessing a child element using @ViewChild()

Is it possible to access the child elements (specifically <img>) of @ViewChild() in Angular 2+ without explicitly declaring them?

Within template.html

<div #parent>
  <!-- Other elements besides <img> can also be present -->
  <img src="http://localhost/123.jpg" alt="">
</div>

Inside component.ts file

@ViewChild('parent') parent;

public getFirstChild() {
   this.firstChild = this.parent.? //
}

The goal is to create a versatile component that makes use of:

<div #parent>
    <ng-content></ng-content>
</div>

Therefore, it should be possible to retrieve and manipulate the child elements within #parent without having to declare them explicitly.

angulartypescriptangular-componentsviewchild

Answer №1

To access the corresponding HTML element using the nativeElement property of the ElementRef provided by ViewChild, you can utilize standard DOM methods and properties like:

  • element.children
  • element.querySelector
  • element.querySelectorAll
  • and more

For instance:

@ViewChild("parent") private parentRef: ElementRef<HTMLElement>;

public getChildren() {
  const parentElement = this.parentRef.nativeElement;
  const firstChild = parentElement.children[0];
  const firstImage = parentElement.querySelector("img");
  ...
}

Check out this example for a live demonstration.

Answer №2

Opt for the ViewChildren alternative, which retrieves all elements with the same tag.

@ViewChildren('parent') parents: QueryList<any>;

To transform those elements into an array:

const arr = this.parent.toArray();

Select the first element:

const el = arr[0]

Retrieve the child HTML of the first element: const innerHtml = el.nativeElement.innerHtml;

Answer №3

If you are looking to access only the first child element in your specific situation.

this.parent.nativeElement.firstChild

Answer №4

Learn HTML

<div id="container">
  <span id="child">
</div>

Try TypeScript

 @ViewChild('container',{static:false}) mainContainer:ElementRef
 this.mainContainer.nativeElement.firstChild

To enhance your coding experience, consider using renderer2

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