css - Can't assign [ngClass] to Angular components generated by *ngFor loop -


i'm trying follow an example showing how bind class active component when it's clicked. when execute code based on markup below

<div *ngfor="let menu of menus;"      [id]="menu.id"      (click)="onclick($event,menu.link)"      [ngclass]="'active':menu.active"      class="navigator">   {{menu.title}} </div>

i following error. nb - there's onclick(...) method in component , @ moment commented out contents. error seems purely related markup (unless need declare in component, array or such). @ least far i've seen examples while googlearching issue.

uncaught error: template parse errors:
parser error: unexpected token ':' @ column 9 in ['active':menu.active] in ng:///appmodule/navigatorcomponent.html@11:9 ("
[id]="menu.id"
(click)="onclick($event,menu.link)"
[error ->][ngclass]="'active':menu.active"
class="navigator">
{{menu.title}}
"): ng:///appmodule/navigatorcomponent.html@11:9

what missing?

'active':menu.active isn't valid expression.

user either object literal syntax 

[ngclass]="{'active':menu.active}"

or string syntax

[ngclass]="menu.active ? 'active' : null"

or

[class.active]="menu.active"

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