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Essential Angular

You're reading from   Essential Angular Fast paced guide to Front-end web development with Angular

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Product type Book
Published in May 2017
Publisher Packt
ISBN-13 9781788293761
Pages 108 pages
Edition 1st Edition
Languages
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Authors (3):
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Narwhal Technologies Inc Narwhal Technologies Inc
Author Profile Icon Narwhal Technologies Inc
Narwhal Technologies Inc
Jeff Cross Jeff Cross
Author Profile Icon Jeff Cross
Jeff Cross
Victor Savkin Victor Savkin
Author Profile Icon Victor Savkin
Victor Savkin
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Toc

Input and output properties

A component has input and output properties, which can be defined in the component decorator or using property decorators.

class TalkCmp {
@Input() talk: Talk;
@Output() rate: EventEmitter;
//...
}

Data flows into a component via input properties. Data flows out of a component via output properties, hence the names: input and output.

Input and output properties are the public API of a component. You use them when you instantiate a component in your application.

<talk-cmp [talk]="someExp" (rate)="onRate($event.rating)"></talk-cmp>;

You can set input properties using property bindings, through square brackets. You can subscribe to output properties using event bindings, through parenthesis.

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