Join Justin Schwartzenberger for an in-depth discussion in this video Structural directives: NgIf, part of Angular 2 Essential Training.
- 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 layout…by adding or removing DOM elements.…Let's start with the angular directive ngIf.…NgIf will conditionally render the DOM element…that the directive is on.…In the media-item.component.html file,…we have some markup to display the data…from a media item object.…
The watchedOn property on a media item may be empty,…so we want the DOM to not contain that element…that has the watchedOn, in the case that the media item…doesn't have a watchedOn value.…The ngIf structural directive works for this.…So we want to put the ngIf directive…on the container element for that value.…Structural directives are applied to normal DOM elements,…using an asterisk template syntax.…So on the element, we need to put asterisk ngIf…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,…so we can put mediaItem.watchedOn in the expression.…
Justin 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
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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