JSFiddle - React, Tailwind, and code Playground

HTML

<input name="amount"  type="text" value="sgu"/>
<table name="apply"><tr><td>Table</td></tr></table>

JavaScript

$("input[name=amount]").keyup(function() {
    if (this.value == '') {
        $("table[name=apply]").hide();
    } else {
        $("table[name=apply]").show();
    }
});