ng-content within *ngIf and a template containing a height based animation. FIXED

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <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>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

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@2.1.2/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common@2.1.2/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler@2.1.2/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser@2.1.2/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@2.1.2/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http@2.1.2/bundles/http.umd.js',
    '@angular/forms': 'npm:@angular/forms@2.1.2/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';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {AccordionPanelComponent} from './accordion-panel.component'
import {ThingComponent} from './thing.component'

@Component({
  selector: 'my-app',
  template: `
        <accordion-panel #panel *ngFor="let foo of things; let i=index" [isOpen]="i==0">
            <div title>
                <span >
                  {{foo.name}}
                </span>
            </div>
            <div content *ngIf="panel.isOpen" style="margin-left: 15px;">
                <my-thing  ></my-thing>
            </div>
        </accordion-panel>

  `,
})
export class App {
  name:string;
  
  things = [
    {name:'Billy', age:1},
    {name:'Jim', age:6},
    {name:'Tom', age:5}
    ];
  
  constructor() {
    this.name = 'Angular2'
  }
}

@NgModule({
  imports: [ BrowserModule],
  declarations: [ App,AccordionPanelComponent,ThingComponent],
  bootstrap: [ App ]
})
export class AppModule {}

import {Component, Input, Output, EventEmitter, } from '@angular/core';

@Component({
    selector: 'accordion-panel',
    exportAs: 'AccordionPanel',
    template: `
  <div class="title" (click)="toggleOpen($event)"  style="border: solid;">
      <ng-content select="[title]"></ng-content>
  </div>
  <div class="content"  >
      <ng-content select="[content]"  ></ng-content>
  </div>

`,
})
export class AccordionPanelComponent {
    @Input() isOpen: boolean 
    
        public toggleOpen(event: MouseEvent): any {
        event.preventDefault();
        if (!this.isDisabled) {
            this.isOpen = !this.isOpen;
        }
    }

}

import {trigger, state, style, transition, animate, keyframes} from '@angular/core';

export function Collapse(duration: number = 300) {
    return trigger('collapse', [
            state('void', style({
                height: '0',
                opacity: '0',
                overflow: 'hidden'
            })),
            state('*', style({
                height: '*',
                opacity: '1',
                overflow: 'hidden'
            })),
            transition('void => *', [
                animate(duration+'ms ease', keyframes([
                    style({opacity: '1'}),
                    style({height: '*'})
                ]))
            ]),
            transition('* => void', [
                animate(duration+'ms ease', style({height: '0'}))
            ])
        ]);
}

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

@Component({
  selector: 'my-thing',
  animations:[Collapse(300)],
  template: `
  some before
  <div *ngIf="true" [@collapse]>any thing</div>
  some after
  `,

})
export class ThingComponent implements OnInit {

}