JSFiddle - React, Tailwind, and code Playground

by ponmudi

HTML

<p>What do you want to calculate?</p>
<form method="post">
    <span>Type here:</span>
    <input type="text" id="calc" />
</form>
<p id="display_result"></p>

JavaScript

num_field = document.getElementById("calc");
num_field.onkeydown = (event) => {
    if (event.keyCode === 13) {
        document.getElementById("display_result").innerHTML = eval(num_field.value);
        return false;
    }
}