jQuery Simple Example

by lustoykov

HTML

<script src="//www.addressfinder.co.nz/assets/v2/widget.js"></script>
<form action="dummy.asp" onSubmit="return handleSubmit()">
  <p> You can only submit if you enter a name! </p>
  <br />
  Enter name: <input class="req" type="text" name="fname">
  <input type="submit" value="Submit">
</form>

<script>
function handleSubmit() {
    const submitAllowed = $('.req').toArray().reduce((result, item) => { 
       return result && (!!item.value || item.value === 0);
    }, true)
    
    return submitAllowed;
}
</script>