title: for input type="number" how to set default value to 0
body: <p>For a textbox that accept numbers as shown below, how can the default value be set to 0?</p>
  
  <pre><code>&lt;input name="smtpPort" type="number" id="smtpPort" size="30" maxlength="50" class="input-full" tabindex="4" value="{{model.PortNumber}}"&gt;
  </code></pre>
  
  <p>Though the value in DB is null, it still shows 0 in textbox.</p>
  
  <p>Any help would be appreciated.</p>