JSFiddle - React, Tailwind, and code Playground

by Mahadevan Sivasubramanian

HTML

Username: <input type="text" id="username">
     <span id="val"></span>
    <input type="button" value="click" onclick="check();"/>

JavaScript

function check() {
        var username = document.getElementById("username").value;

        if(username == ""){
            document.getElementById("val").innerHTML = "Empty";
        } else {
            document.getElementById("val").innerHTML = "Full";

        }
    }