CUSTOM_ELEMENTS_SCHEMA added to NgModule.schemas still showing Error

Question

I just upgraded from Angular 2 rc4 to rc6 and having troubles doing so.

I see the following error on my console:

Unhandled Promise rejection: Template parse errors:
'cl-header' is not a known element:
1. If 'cl-header' is an Angular component, then verify that it is part of this module.
2. If 'cl-header' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA" to the '@NgModule.schema' of this component to suppress this message. ("<main>
    [ERROR ->]<cl-header>Loading Header...</cl-header>
    <div class="container-fluid">
      <cl-feedbackcontai"): AppComponent@1:4

Here is my Header Component:

import { Component } from '@angular/core';
import { Router } from '@angular/router';

// own service
import { AuthenticationService } from '../../../services/authentication/authentication.service.ts';

import '../../../../../public/css/styles.css';

@Component({
  selector: 'cl-header',
  templateUrl: './header.component.html',
  styleUrls: ['./header.component.css']
})
export class HeaderComponent { // more code here... }

Here is my Header Module:

import { NgModule, CUSTOM_ELEMENTS_SCHEMA }      from '@angular/core';
import { RouterModule } from '@angular/router';
import { CommonModule }      from '@angular/common';
import { FormsModule }      from '@angular/forms';

import { HeaderComponent }  from './../../../components/util_components/header/header.component.ts';

@NgModule({
    declarations: [ HeaderComponent ],
    bootstrap:    [ HeaderComponent ],
    imports: [ RouterModule, CommonModule, FormsModule ],
    schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
})
export class HeaderModule { }

I created a wrapper module called util module which imports the HeaderModule:

import { NgModule }      from '@angular/core';

import {HeaderModule} from "./header/header.module";
// ...

@NgModule({
    declarations: [ ],
    bootstrap:    [ ],
    imports: [ HeaderModule]
})
export class UtilModule { }

Which is finally imported by the AppModule:

import { NgModule }      from '@angular/core';

import { BrowserModule } from '@angular/platform-browser';

import { AppComponent }  from './app.component';

import {UtilModule} from "./modules/util_modules/util.module";
import {RoutingModule} from "./modules/routing_modules/routing.module";

@NgModule({
    bootstrap: [AppComponent],
    declarations: [AppComponent],
    imports: [BrowserModule, UtilModule, RoutingModule]
})
export class AppModule { }

To my understanding I am following the instructions of the error message using the SCHEMA to surpress the error. But it seems not to work. What am I doing wrong? (I hope its nothing obvious I just don't see at the moment. Been spending the past 6 hours upgrading to this version...)

Answer 1

Just wanted to add a little bit more on this.

With the new angular 2.0.0 final release (sept 14, 2016), if you use custom html tags then it will report that Template parse errors. A custom tag is a tag you use in your HTML that's not one of these tags.

It looks like the line schemas: [ CUSTOM_ELEMENTS_SCHEMA ] need to be added to each component where you are using custom HTML tags.

EDIT: The schemas declaration needs to be in a @NgModule decorator. The example below shows a custom module with a custom component CustomComponent which allows any html tag in the html template for that one component.

custom.module.ts

import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { CommonModule } from '@angular/common';

import { CustomComponent } from './custom.component';

@NgModule({
  declarations: [ CustomComponent ],
  exports: [ CustomComponent ],
  imports: [ CommonModule ],
  schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
})
export class CustomModule {}

custom.component.ts

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'my-custom-component',
  templateUrl: 'custom.component.html'
})
export class CustomComponent implements OnInit {
  constructor () {}
  ngOnInit () {}
}

custom.component.html

In here you can use any HTML tag you want.

<div class="container">
  <boogey-man></boogey-man>
  <my-minion class="one-eyed">
    <job class="plumber"></job>
  </my-minion>
</div>