Join Justin Schwartzenberger for an in-depth discussion in this video Working with events in directives, part of Angular Essential Training (2018).
- [Instructors] Directives can not only handle…changing host element properties via HostBindings…but they can also be set up to respond…to host element events via HostListeners.…Over in the favorite.directive.ts file,…let's add some HostListeners to toggle on and off…a CSS class is-favorite-hovering.…Angular provides another decorator for handling wiring up…to host element events.…The HostListener decorator.…HostListener is found in the angular core scope package,…just like HostBinding.…
So we can add that to the import statement.…Before we use the HostListener decorator,…let's add another HostBinding for the…is-favorite-hovering CSS class.…And we'll use it to decorate a favorite directive…class property named hovering,…setting it to a default value of false.…We will toggle this value from mouse hover events…to handle adding or removing the CSS class.…
Okay, let's add some HostListeners.…The HostListener decorator takes in the name of the event…as a string for the first argument…and an optional second argument…that is an array of arguments…
Author
Justin Schwartzenberger
Updated
3/1/2018Released
10/31/2016Justin Schwartzenberger steps through the framework one feature at a time, focusing on the component-based architecture of Angular. Learn what Angular is and what it can do, as Justin builds a full-featured web app from start to finish. After mastering the essentials, you can tackle the other project-based courses in our library and create your own Angular app.
- What is Angular?
- Setting up an Angular template
- Creating a component
- Binding events and properties
- Getting data to components
- Using directives and pipes
- Creating Angular forms
- Validating form data
- Understanding dependency injection
- Providing services
- Making HTTP calls
- Routing
Skill Level Beginner
Duration
Views
Q: This course was updated on 03/01/2018. What changed?
A: The following topics were updated: directives and pipes, forms, dependency injection and services, HTTP, and routing.
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Introduction
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Welcome1m 27s
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Why use AngularJS 2?1m 36s
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Using the exercise files1m 51s
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Basics of TypeScript2m 24s
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Course overview1m 2s
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1. Architecture Overview
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Directives and pipes1m 40s
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Data binding1m 53s
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Dependency injection1m 54s
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Data persistence1m 47s
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Routing1m 50s
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2. Components
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NgModule and the root module5m 59s
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Component metadata2m 4s
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The component selector2m 12s
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The component template2m 59s
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Styling a component5m 3s
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Property binding2m 30s
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3. Directives and Pipes
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Structural directives: ngFor3m 34s
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Attribute directives: custom3m 53s
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Using directive values3m 36s
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Angular pipes: built in3m 1s
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Angular pipes: custom4m 28s
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4. Forms
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Angular forms1m 29s
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Template-driven forms4m 45s
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Model-driven forms4m 19s
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Validation: built in3m 28s
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Validation: custom3m 2s
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Error handling5m 10s
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5. Dependency Injection and Services
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Services in Angular2m 22s
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Class constructor injection2m 39s
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The Inject decorator3m 40s
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Injection token3m 36s
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6. HTTP
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The Angular HttpClient2m 5s
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7. Routing
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Router links2m 36s
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Conclusion
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Next steps1m 20s
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Video: Working with events in directives