CODEWITHSUNDEEP
angular
kemsky
kemsky

Reputation: 15261

Angular 2: capture events from ng-content

Angular app structure:

<app><div content><a href="#" (click)="show()">click me</a></div></app>

Content component template:

<ng-content></ng-content>

Content component has public method show(), but when i click this link i get:

Error: EXCEPTION: Error during evaluation of "click"
ORIGINAL EXCEPTION: TypeError: l_context.show is not a function
ORIGINAL STACKTRACE:
anonymous/ChangeDetector_AppComponent_0.prototype.handleEventInternal@http://localhost:3000/node_modules/angular2/bundles/angular2.dev.js line 10897 > Function:207:13
AbstractChangeDetector</AbstractChangeDetector.prototype.handleEvent@http://localhost:3000/node_modules/angular2/bundles/angular2.dev.js:8788:17

Basically i want to reuse page markup and put listeners on existing dom, i don't want to create additonal templates or components. Probably i'm missing something obvious.

Planker

Upvotes: 7

Views: 6889

Answers (1)

G&#252;nter Z&#246;chbauer
G&#252;nter Z&#246;chbauer

Reputation: 657118

show() would resolve to the parent component of <app> and because it looks like <app> is the root component, there is no parent.

I guess the bug here is that Angular even tries to bind to the click event. I got the impression that <ng-content> isn't supported at all on the root component.

See also https://github.com/angular/angular/issues/1858 (https://github.com/angular/angular/issues/6046)

Update

<h1>Angular</h1>
<div content #contentRef>
    <ui>
        <li><a href="#" (click)="contentRef.show($event)" class="link" button>link 1</a></li>
        <li><a href="#" (click)="contentRef.show($event)" class="link" button>link 2</a></li>
        <li><a href="#" (click)="contentRef.show($event)" class="link" button>link 3</a></li>
    </ui>
</div>

bindings are resolved within the component where they are declared. In the above example I explicitly redirected the reference to the ContentComponent by creating a template variable #contentRef on the target element and referring it when defining the click handler (click)="contentRef.show($event)".

Even though the content is "passed" to another component using <ng-content> doesn't mean the scope changes. <ng-content> is only a projection - the elements are displayed at a different place is all, they are still "owned" by the component where they are added originally.

Upvotes: 7

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