Angular
Understanding Angular Directives: Built-in and Custom Approaches
Introduction
The user needs to understand the capabilities of Angular directives between built-in and custom directive approaches when using such features in their work.
Angular directives function as powerful elements which enable users to change DOM elements while enhancing HTML features. Through development of dynamic and reusable user interface elements they allow developers to work efficiently. This article covers both built-in Angular features and demonstrates steps to make custom directives in the framework.
Built-in Directives in Angular
1. Structural Directives (modify DOM structure)
- *ngIf – Conditionally adds/removes elements
- *ngFor – Loops through an array to create elements
- *ngSwitch – Displays elements based on conditions
2. Attribute Directives (modify the appearance or behavior of elements)
- ngClass – Dynamically adds or removes classes
- ngStyle – Applies dynamic styles to elements
3. Component Directives
- Every Angular component is a directive with a template
Creating a Custom Directive
Custom directives serve to contain reusable functional code blocks. A basic directive demonstrates text color modification upon hovering over elements below.
import { Directive, ElementRef, HostListener } from '@angular/core';@Directive({selector: '[appHoverHighlight]'})export class HoverHighlightDirective {constructor(private el: ElementRef) {}@HostListener('mouseenter') onMouseEnter() {this.el.nativeElement.style.color = 'blue';}@HostListener('mouseleave') onMouseLeave() {this.el.nativeElement.style.color = 'black';}}How to Use the Directive?
Apply it to an element in your template:
<p appHoverHighlight>Hover over me to change color!</p>Conclusion
The UI functionality of Angular applications gets enhanced through directives that enable dynamic features. By learning directives you will develop the ability to create Angular applications that remain neat and practical.
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