Content Projection

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>Content Projection Examples</title>
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <sample-app>loading...</sample-app>
  </body>

</html>

### Angular Content Projection Example App

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    
    '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',
    
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.0.2/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';

platformBrowserDynamic().bootstrapModule(AppModule);

//our root app component
import { Component, NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { AppComponent } from './app.component';
import { TestParentComponent } from './test-parent/test-parent.component';
import { TestChildComponent } from './test-parent/test-child/test-child.component';


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

import { Component } from '@angular/core'

@Component({
  selector: 'sample-app',
  template: `
    <div style="background-color:yellow;"> 
      <h4>In AppComponent's tpl</h4>
      <test-parent>
        <div style="background-color: red;">
          <h4>In AppComponent's content projected tpl</h4>
        </div>
        <test-child></test-child>
      </test-parent>
   </div>
  `,
})
export class AppComponent {
  constructor() { }
}

import { Component, ContentChild, ViewChild, AfterContentInit, AfterViewInit } from '@angular/core'
import { TestChildComponent } from './test-child/test-child.component';

@Component({
  selector: 'test-parent',
  template: `
   <div style="background-color: grey;">
      <h4>In ParentComponent's tpl</h4>
      <ng-content></ng-content>
   </div>
  `,
})
export class TestParentComponent {
  @ContentChild(TestChildComponent) childCmp: TestChildComponent;
  @ViewChild(TestChildComponent) childCmp2: TestChildComponent;
    
  constructor() { }
  
  ngAfterContentInit() {
    if(this.childCmp) {
      this.childCmp.callMe();
    } else {
      console.log('[ngAfterContentInit] not found childCmp');
    }
  }
  
  ngAfterViewInit() {
    if(this.childCmp2) {
      this.childCmp2.callMe();
    } else {
      console.log('[ngAfterViewInit] not found childCmp2');
    }
  }
}

import { Component } from '@angular/core'

@Component({
  selector: 'test-child',
  template: `
    <div style="background-color: skyblue;">
      <h4>In ChildComponent's tpl</h4>
    </div>
  `,
})
export class TestChildComponent {
  constructor() { }
  
  callMe() {
    console.log('here is child component');
  }
}