I'm struggling to understand when it's best to
Why should I use an attribute directive?
I often find myself combining all logic within a single component, despite knowing its formal definition. I have trouble identifying practical examples.
What are some recommended practices for handling this?
Utilizing directives allows for the manipulation of DOM elements. This is particularly beneficial when creating custom directives that can be shared with other developers within your team or community.
There are primarily three categories of directives:
1) Structural Directives
2) Attribute Directives
3) Component Directives (with templates)
1) Structural Directives are typically used to alter the structure of a view or template. For instance, *ngFor generates elements based on the number of items in a list, while *ngIf controls the visibility of a view based on a provided condition.
For example:
<p myColor >Color me!</p> // This directive uses ElementRef to change the background color of the element to red.
import { Directive, ElementRef, HostListener, Input } from '@angular/core';
@Directive({
selector: '[myColor]'
})
export class HighlightDirective {
constructor(private el: ElementRef) {
el.nativeElement.style.backgroundColor = 'red';
}
}
Here, myColor is an attribute directive because it is added as an attribute to the DOM element, although it does not accept a value yet.
To assign a value to the myColor attribute, you can do:
<p [myColor]="color">Highlight me!</p>
color variable (Angular2 bindings)@Input API for receiving the value from the parent component (considering the directive as a child of the parent).
@Output API can be utilized.
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