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

What am I doing wrong?

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

@Component({
  selector: 'conf-talks',
  template: `<div *ngFor="let talk in talks">
     {{talk.title}} by {{talk.speaker}}
     <p>{{talk.description}}
   </div>`
})
class ConfTalks {
  talks = [ {title: 't1', speaker: 'Brian', description: 'talk 1'},
            {title: 't2', speaker: 'Julie', description: 'talk 2'}];
}
@Component({
  selector: 'my-app',
  directives: [ConfTalks],
  template: '<conf-talks></conf-talks>'
})
class App {}
bootstrap(App, [])

The error is

EXCEPTION: Template parse errors:
Can't bind to 'ngForIn' since it isn't a known native property
("<div [ERROR ->]*ngFor="let talk in talks">

My problem was, that Visual Studio somehow automatically lowercased *ngFor to *ngfor on copy&paste.

Try to import import { CommonModule } from '@angular/common'; in angular final as *ngFor ,*ngIf all are present in CommonModule

There is an alternative if you want to use of and not switch to in. You can use KeyValuePipe introduced in 6.1. You can easily iterate over an object:

<div *ngFor="let item of object | keyvalue">
  {{item.key}}:{{item.value}}
</div>

TL;DR;

Use let...of instead of let...in !!

If you're new to Angular (>2.x) and possibly migrating from Angular1.x, most likely you're confusing in with of. As andreas has mentioned in the comments below for ... of iterates over values of an object while for ... in iterates over properties in an object. This is a new feature introduced in ES2015.

Simply replace:

<!-- Iterate over properties (incorrect in our case here) -->
<div *ngFor="let talk in talks">

with

<!-- Iterate over values (correct way to use here) -->
<div *ngFor="let talk of talks">

So, you must replace in with of inside ngFor directive to get the values.

Q:Can't bind to 'pSelectableRow' since it isn't a known property of 'tr'.

A:you need to configure the primeng tabulemodule in ngmodule

In my case, WebStrom auto-complete inserted lowercased *ngfor, even when it looks like you choose the right camel cased one (*ngFor).

my solution was - just remove '*' character from the expression ^__^

<div ngFor="let talk in talks">

Watching this course https://app.pluralsight.com/library/courses/angular-2-getting-started-update/discussion

The author explains that new version of JavaScript has for of and for in, the for of is to enumerate objects and the for in is to enumerate the index of the array.