title: Is there a way to make sure at least ONE of a group of fields is filled, BEFORE sumitting a html form? ("required" is used just to one <input> field)
body: <p>I use &quot;required&quot; if I want that this field (price) is filled before submitting the form:</p>
  <pre><code>&lt;input required=&quot;&quot; type=&quot;number&quot; name=&quot;price&quot; /&gt;
  </code></pre>
  <p>How can I make sure that at least one or more fields of a certain group of fields, is filled BEFORE submitting the form? If one field is filled is enough.</p>