Join Justin Schwartzenberger for an in-depth discussion in this video Structural directives: ngIf, part of Angular 2 Essential Training.
- [Instructor] Angular has two types of directives,…structural and attribute.…Let's take a look at structural directives first.…A structural directive is designed to alter the DOM way out…by adding or removing DOM elements.…Let's start with the Angular directive ng if.…Ng if will conditionally render…the DOM element that the directive is on.…In the media-item.component.html file,…we have some mark-up to display the data…from a media item object.…
The watched on property on a media item may be empty,…so we want the DOM to not contain that element…that has the watched on…in the case that the media item…doesn't have a watched on value.…The ng if structural directive works for this,…so we want to put the ng if directive…on the container element for that value.…Structural directives are applied to normal DOM elements…using an asterisks template syntax.…So, on the element we need to put *ng if…and set that equal to a statement…that will evaluate to true or false.…
In this case we want to see…if mediaItem.watchedOn has a value.…
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
1. Architecture Overview
3. Directives and Pipes
5. Dependency Injection and Services
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