JSFiddle - React, Tailwind, and code Playground
HTML
<form action="" method="post" name="myForm">
<label>Name</label>
<input type="text" name="name" id="name" />
<input type="submit" name="submit" onclick="validate()" />
</form>
JavaScript
var name = document.getElementById("name");
function validate() {
alert("Your name is " +name);
}