JSFiddle - React, Tailwind, and code Playground

by master1991

HTML

<div class="qInDocBXXX AB"></div>
<input type="text" name="valueToAdd" data-item="XXX AB" class="BenterInput">

<a class="btn btn-default btn-xs add_row BXXX AB" data-but="B" style="display: none;">XXX</a>

JavaScript

$(document).on('keyup', ".BenterInput", function() {
  var item = $(this).attr('data-item');
  var num = $(this).val();
  $(`a.B${item.split(" ").join(".")}`).toggle($.isNumeric(num));
});