userqwert userqwert - 3 years ago 320
Javascript Question

Angular 2 passing html to ng-content with bindings

I'm writing angular components for the foundation css framework. I am working on the tabs component, and want to be able to pass some HTML to the

<ng-content>
of this.

The problem is, I also need to pass html which a user can put bindings on, like this:

PARENT TEMPLATE

<tabs [data]='example'>
<div> Age <br> {{item.age}} </div>`
</tabs>


TABS COMPONENT

<ul class="tabs" #tabs>
<li *ngFor="let item of data | async" (click)="tabClick($event)">
<a>{{item.name}}</a>
</li>
</ul>
<div>
<ng-content></ng-content>
</div>


TABS TYPESCRIPT

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

export class TabsComponent {
@Input('data') data:any;
@ViewChild('tabs') tabs: ElementRef;
}


Where
item
is a reference to an object in the
example
array.

However, I get this error:
Cannot read property 'name' of undefined

as
item
is being evaluated before it is inserted into the
<ng-content>
directive.

Is there a way to get around this limitation, or am I going about this the wrong way?

Answer Source

update Angular 5

ngOutletContext was renamed to ngTemplateOutletContext

See also https://github.com/angular/angular/blob/master/CHANGELOG.md#500-beta5-2017-08-29

original

ngTemplateOutlet or ngForTemplate can be used for that use case:

<tabs [data]='example'>
  <ng-template let-item>
    <div> Age <br> {{item.age}} </div>`
  </ng-template>
</tabs>
@Component({
  ...
  template: `
    <ul class="tabs" #tabs>
      <li *ngFor="let item of data | async" (click)="tabClick($event)">
          <a>{{item.name}}</a>
      </li>
    </ul>
    <div>
      <ng-template [ngTemplateOutlet]="templateRef" [ngTemplateOutletContext]="{$implicit: (data | async)}"></ng-template>
    </div>
  `
})
class TabsComponent {
  @ContentChild(TemplateRef) templateRef:TemplateRef;
}

See also Angular 2 bind transcluded content to loop variable

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