Angular exception: Can't bind to 'ngForIn' since it isn't a known native property

Question

What am I doing wrong?

import {bootstrap, Component} from \'angular2/angular2\'

@Component({
  selector: \'conf-talks         


        

Answer 1

Since this is at least the third time I've wasted more than 5 min on this problem I figured I'd post the Q & A. I hope it helps someone else down the road... probably me!

I typed in instead of of in the ngFor expression.

Befor 2-beta.17, it should be:

As of beta.17, use the let syntax instead of #. See the UPDATE further down for more info.

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Note that the ngFor syntax "desugars" into the following:

If we use in instead, it turns into

Since ngForIn isn't an attribute directive with an input property of the same name (like ngIf), Angular then tries to see if it is a (known native) property of the template element, and it isn't, hence the error.

UPDATE - as of 2-beta.17, use the let syntax instead of #. This updates to the following:

Note that the ngFor syntax "desugars" into the following:

If we use in instead, it turns into