How to notify parent about change in child component?
<p>I have a child component with this template:</p>

<pre><code>&lt;p *ngIf="user != null" &gt;
    Id: {{user.id}}&lt;br&gt;
    Name: {{user.firstName}} {{user.lastName}}&lt;br&gt;
    Nick: {{user.nickname}}&lt;br&gt;
    Gender: {{user.gender}}&lt;br&gt;
    Birthday: {{user.birthday}}&lt;br&gt;
    Last login: {{user.lastUpdateDate}}&lt;br&gt;
    Registered: {{user.registrationDate}}&lt;br&gt;
&lt;/p&gt;
</code></pre>

<p>I get user from server using http request, so when data is loaded, user is shown.</p>

<p>How can I notify parent component that data was loaded and shown?</p>