Item inside a button needs double click.

<!DOCTYPE html>
<html>
  <head>
    <script src="https://code.angularjs.org/tools/system.js"></script>
    <script src="https://code.angularjs.org/tools/typescript.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/reflect-metadata/0.1.3/Reflect.js"></script>
    <script src="https://cdn.rawgit.com/angular/zone.js/master/dist/zone.min.js"></script>
    <script src="config.js"></script>
    <script src="https://npmcdn.com/ionic-angular@2.0.0-beta.8/bundles/ionic.system.js"></script>
  
    <link href="https://npmcdn.com/ionic-angular@2.0.0-beta.8/bundles/ionic.css" rel="stylesheet">
    <link href="style.css" rel="stylesheet">
  </head>

  <body>
    <!-- this Ionic's root component and where the app will load -->
    <ion-app></ion-app>
    
    <script>
      System.import('app.ts')
    </script>
  </body>

</html>

/**
 * PLUNKER VERSION (based on systemjs.config.js in angular.io)
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 * Override at the last minute with global.filterSystemConfig (as plunkers do)
 */
(function(global) {

  var ngVer = '@2.0.0-rc.1'; // lock in the angular package version; do not let it float to current!

  //map tells the System loader where to look for things
  var  map = {
    'app':                        'src', // 'dist',
    'rxjs':                       'https://npmcdn.com/rxjs@5.0.0-beta.6',
    'angular2-in-memory-web-api': 'https://npmcdn.com/angular2-in-memory-web-api' // get latest
  };

  //packages tells the System loader how to load when no filename and/or no extension
  var packages = {
    'app':                        { main: 'app.ts',  defaultExtension: 'ts' },
    'rxjs':                       { defaultExtension: 'js' },
    'angular2-in-memory-web-api': { defaultExtension: 'js' },
  };

  var packageNames = [
      '@angular/common',
      '@angular/compiler',
      '@angular/core',
      '@angular/http',
      '@angular/router',
      '@angular/platform-browser',
      '@angular/platform-browser-dynamic',
      '@angular/router-deprecated',
      '@angular/testing',
      '@angular/upgrade',
  ];

  // add map entries for angular packages in the form '@angular/common': 'https://npmcdn.com/@angular/common@0.0.0-3'
  packageNames.forEach(function(pkgName) {
    map[pkgName] = 'https://npmcdn.com/' + pkgName + ngVer;
  });

  // add package entries for angular packages in the form '@angular/common': { main: 'index.js', defaultExtension: 'js' }
  packageNames.forEach(function(pkgName) {
    packages[pkgName] = { main: 'index.js', defaultExtension: 'js' };
  });

  var config = {
    transpiler: 'typescript',
    typescriptOptions: {
      emitDecoratorMetadata: true
    },
    map: map,
    packages: packages
  }

  // filterSystemConfig - index.html's chance to modify config before we register it.
  if (global.filterSystemConfig) { global.filterSystemConfig(config); }

  System.config(config);

})(this);


/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/

import { Component } from "@angular/core";
import { ionicBootstrap, Platform } from 'ionic-angular/index';
import { Page1 } from './page1.ts';


@Component({
  template: '<ion-nav [root]="rootPage"></ion-nav>'
})
export class MyApp {
  constructor(private platform: Platform) {
    this.rootPage = Page1;
  }
}

ionicBootstrap(MyApp);

import {Component} from "@angular/core";
import {NavController} from 'ionic-angular/index';

@Component({
  templateUrl: 'page1.html'
})
export class Page1 {

  messages = [];

  constructor(private _navController: NavController) {
    this.messages = [
      {text: 'Hi'},
      {text: 'Hi there!'}
    ]
  }

  addMessage(message) {
    this.messages.push({text: message.value});
    message.value = "";
  }

}

<ion-navbar *navbar>
  <ion-title>
    Ionic Beta 8
  </ion-title>
</ion-navbar>

<ion-content padding class="page1">
  <h2>Keyboard problem</h2>
  <div padding *ngFor="let message of messages">{{message.text}}</div>
</ion-content>

<ion-toolbar position="bottom">
  <!--<button>menu</button>-->
  <ion-item>
    <ion-input #f type="text"></ion-input>
    <button small item-right (click)="addMessage(f)">Send</button>
  </ion-item>
</ion-toolbar>