JSFiddle - React, Tailwind, and code Playground

HTML

<form id="demoForm">
    <label for="usernameFld">Username:</label>
    <input type="text" id="usernameFld" name="username"/><br/>
    <label for="passwordFld">Password:</label>
    <input type="password" id="passwordFld" name="password"/><br/>
    <button type="submit">Log In Button</button>
    <input type="submit" value="Log In Input"/>
</form>

JavaScript

$('#demoForm').submit(function(evt) {
    evt.preventDefault();
    var data = $(this).serialize();
    alert(data);
});