title: angular2 pass ngModel to a child component
body: <p>I have ParentComponent and a ChildComponent, and I need to pass the ngModel in ParentComponent to ChildComponent.</p>
  
  <pre><code>// the below is in ParentComponent template
  &lt;child-component [(ngModel)]="valueInParentComponent"&gt;&lt;/child-component&gt;
  </code></pre>
  
  <p>how can I get the value of ngModel in ChildComponent and manipulate it?</p>