JSFiddle - React, Tailwind, and code Playground

HTML

<input id="textbx" type="text" /><button id="btn" disabled>go</button>

JavaScript

$("#textbx").blur(function(){
 var fieldLength = $("#textbx").val();
    if (fieldLength.length == 0) {
      $("#btn").attr('disabled','disabled');
   }
   else{
   	$("#btn").removeAttr('disabled');
   }
  });