(Angular4 and TypeScript) Connecting a Component's @Input Property to the View

How can I show a component input property in the view?

I have attempted various methods, but none of them seem to be working as expected. Reference:

Component implementation:

<card [title]='My Awesome Card'></card>

Template section:

<div class="ui card">
  <div class="content">
    <div class="header">{{ title }}</div>
  </div>
</div>

Snippet of the component setup:

@Component({
  selector: 'card',
  templateUrl: './card.component.html'
})

export class CardComponent implements OnInit {

  private _title: string;

  get title(): string {
    return this._title;
  }

  @Input()
  set title(title: string) {
    console.log('Previous value: ', this._title);
    console.log('New title received: ', title);
    this._title = title;
  }

  ...

Answer №1

One way to pass strings into an @Input property is demonstrated below:

<widget [name]="'Super Widget'"></widget>

Answer №2

Upon examination, I have identified 2 errors:

Issue with passing string literals

<card [title]="'My Awesome Card'"></card>
- Instead of passing a variable, make sure to enclose the string within quotes when passing it.

@Input usage - When passing data to a child component, ensure that it is declared as an @Input variable rather than a function. Remember to declare the variable as @Input.

@Component({
  selector: 'card',
  templateUrl: './card.component.html'
})

export class CardComponent implements OnInit {

  @Input() _title: string;

  get title(): string {
    return this._title;
  }

  set title(title: string) {
    console.log('Previous value: ', this._title);
    console.log('New title received: ', title);
    this._title = title;
  }

Answer №3

When declaring components, we have the option of passing input variables in the following manner:

@Input() title: string = "My Amazing Card";

Alternatively, we can also do this:

@Input() title: string

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