JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<p>Enter X (capital x) to hide links</p>
<input name="textBox1" type="text" id="textBox1" />
<a id="link1" href="#">Button1</a>
<a id="link2" href="#">Button2</a>

JavaScript

$(function() {
       $("#textBox1").blur(function() {
         if ($(this).val() === "X") {
           $("#link1").hide();
           $("#link2").hide();
         }
       });
     })