Join Justin Schwartzenberger for an in-depth discussion in this video Working with events in directives, part of Angular 2 Essential Training.
- [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…
Justin Schwartzenberger steps through the framework one feature at a time, focusing on the new component-based architecture of Angular 2. You'll 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
Skill Level Intermediate
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.
1. Architecture Overview
3. Directives and Pipes
5. Dependency Injection and Services
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