Exploring the @HostBinding argument in Angular directives

Need help grasping the concept behind the @Hostbinding argument:

Snippet of the code:

import { Directive, HostBinding } from "@angular/core";

@Directive({
    selector: '[appDropdown]'
})
export class DropdownDirective {
    @HostBinding('class.open') isOpen = false;

}

Why is 'class.open' used as the argument in @Hostbinding()? It seems like treating class as an object.

Answer №1

Retrieve an element and display it in the console using this method:

console.log($('div'));

Upon viewing the console, you will notice that the element is represented as an object with properties and methods. For a closer look, try logging the following line:

console.log($("div").attributes.class.value);

You will then see the class attribute being outputted in the console.

If the class is defined as "class.open," it indicates that the element likely possesses multiple classes.

An alternate way to visualize it is as follows:

Element: {
     attributes : {
                  class : {
                        "open", etc... 
                  }
               }
}

This breakdown may offer insight into what is occurring within the element.

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