JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="num" id="num" placeholder="Enter a number greater than 4" />
<button id="btn">Submit</button>

JavaScript

$(function () {
    $('#btn').click(function () {
        var num = parseFloat($('#num').val());
        if (num > 4.0) {
            alert('All good!');
            return true;
        } else {
            alert('Your number is not greater than 4!');
            return false;
        }
    });
});