JSFiddle - React, Tailwind, and code Playground

by adam smth

HTML

<input ID="FirstName1" class="test" onkeydown="return Fname(event);">
<script>
  function Fname(evt) {

    evt = (evt) ? evt : event;
    var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode : ((evt.which) ? evt.which : 0));

//alert(charCode);
    //checks for invalid keystrokes (numbers only)
    if (charCode > 57 &&(charCode < 96 || charCode > 105) || charCode < 48) {
      return false;
    } else {
      return true;
    }
  }

</script>