获取DOM元素，它是Angular中的一个组件

Question

I read some answers already here, such as this , but my problem is slightly different. I want to get component as a DOM element so that I can add/remove some CSS classes on it.

My HTML template contains component:

<sidenav-menu #sidenav class="app__sidenav"></sidenav-menu>

And my class contains a reference to it:

@ViewChild('sidenav') sidenav: ElementRef;

But when I log this.sidenav in one of my functions, I see that it is a representation of a class of Sidenav component, not its DOM representation. Why is that happening?

Answer 1

You can specify what you want using the read parameter:

@ViewChild('sidenav', {read: ElementRef}) sidenav: ElementRef;

This way you get the ElementRef and can use this.sidenav.nativeElement like mentioned by @joshrathke

or (for other use cases)

@ViewChild('sidenav', {read: ViewContainerRef}) sidenav: ElementRef;

My answer to the question you liked to also mentions this read parameter https://stackoverflow.com/a/35209681/217408

Answer 2

Edit

In order for this to work, you need to implement @Günter Zöchbauer suggestion for extracting the component using ViewChild with read .

Original Answer

You need to use the nativeElement property of the ElementRef object. You'll find your DOM Representation there. Its also what exposes the DOM element and allows you to call traditional methods on it as if it was a DOM element in vanilla javascript or jQuery.

console.log(this.sidenav.nativeElement);