Directives
What are directives?
TypeScript classes to manipulate DOM elements
Operate on existing elements
Don't have a template
Angular provides several directives: ngStyle, ngClass, ngModel
Creating custom directives
ng generate directive highlight
or ng g d highlight
Why not highlight? - To avoid naming conflicts, Angular prepends the application name to the selector to ensure uniqueness.
Adding directive to module - The Angular CLI automatically added our new directive to the nearest parent module, or app.module in this case. If you create the directive manually, you will need to add it to a parent module before using it.
Directive Usage
Directive User Events
If we wanted to highlight the text only when the user mouses over the element, then we would need to react to user events.
The @HostListener
decorator lets you subscribe to events of the DOM element that hosts an attribute directive.
Passing Inputs to a Directive
Summary
What are directives?
Creating custom directives
Handling user events
Passing inputs to directive
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