title: Angular 8 : Make FormBuilder Accept Numbers Only with Range for Latitude and Longitude
body: <p>How do I get FormBuilder to require numbers?</p>
  
  <p>I am writing a Formbuilder for Latitude and Longitude.
  In this below, </p>
  
  <ul>
  <li>Writing -91 or 91 will give Validation errors, working as expected</li>
  <li>Anything between -90 and 90 works which is good.</li>
  <li>It accepts numbers up to 32 digits and decimal points, also working</li>
  </ul>
  
  <p>Problem: </p>
  
  <ul>
  <li>However typing in Letters 'Abcd' etc, does Not give validation errors. </li>
  </ul>
  
  <p>How can this be resolved?</p>
  
  <pre><code>  'latitude': [null, [Validators.maxLength(32), Validators.min(-90), Validators.max(90)]],
  </code></pre>
  
  <p>Prefer to have validation in form, rather than input textbox type=number if possible,</p>