title: HTML input do not allow numbers
body: <p>Right now I have an input field like this:</p>
  
  <pre><code>&lt;input class="form-control" type="text"/&gt;
  </code></pre>
  
  <p>But it stills allows the input of numbers.</p>
  
  <p>I want names to be input and want to display an error message when the string contains a number. How can I achieve this?</p>