Evolution

In the beginning, there was html


<form method=post action=signup>
  <label>Username       <input name=user></label>
  <label>Password       <input name=pw type=password></label>
  <label>Password again <input name=pwv type=password></label>
  <button>Submit</button>
</form>

Then came JavaScript

<form id=signup method=post action=signup>
  <label>Username       <input name=user></label><br>
  <label>Password       <input name=pw type=password></label><br>
  <label>Password again <input name=pwv type=password></label><br>
  <button>Submit</button>
</form>

<script>
<!--
document.forms.signup.onsubmit = function () {
  if (this.pw.value != this.pwv.value) {
    alert("Passwords don't match")
    return false
  }
}
// -->
</script>

And jQuery

<script src="https://code.jquery.com/jquery-1.1.4.js"></script>

<form id="signup" method="post" action="signup">
    <label>Username       <input name="user"></label><br/>
    <label>Password       <input name="pw" type="password"></label><br/>
    <label>Password again <input name="pwv" type="password"></label><br/>
    <button>Submit</button>
</form>

<script>
// <![CDATA[
$('#signup').submit(function () {
  if (this.pw.value != this.pwv.value) {
    alert("Passwords don't match")
    return false
  }
})
// ]]>
</script>

And json

<script src="https://code.jquery.com/jquery-1.5.js"></script>

<form id="signup">
    <label>Username       <input name="user"></label><br/>
    <label>Password       <input name="pw" type="password"></label><br/>
    <label>Password again <input name="pwv" type="password"></label><br/>
    <button>Submit</button>
</form>

<script>
/*jslint browser: true */
/*global $, alert, window */

$("#signup").submit(function (event) {
    "use strict";

    var form = $(event.target);
    var formData = {};

    form.find("input").each(function (ignore, el) {
        var input = $(el);
        var name = input.attr("name");
        formData[name] = input.val();
    });

    if (formData.pw !== formData.pwv) {
        alert("Passwords don't match");
    } else {
        $.ajax("signup", {
            type: "POST",
            contentType: "application/json",
            data: JSON.stringify(formData)
        }).done(function () {
            window.location = "signup";
        }).fail(function () {
            alert("Error");
        });
    }

    return false;
});
</script>

And Ecma 6

<form id="signup">
    <label>Username       <input name="user"></label><br>
    <label>Password       <input name="pw" type="password"></label><br>
    <label>Password again <input name="pwv" type="password"></label><br>
    <button>Submit</button>
</form>

<script>
/*jshint esversion: 6 */
document.querySelector("#signup").addEventListener("submit", submitEvent => {
    "use strict";
    
    const form = submitEvent.target;
    const formData = {};

    submitEvent.preventDefault();

    for (const input of form.querySelectorAll("input")) {
        var name = input.getAttribute("name");
        formData[name] = input.value;
    }

    if (formData.pw !== formData.pwv) {
        alert("Passwords don't match");
    } else {
        const xhr = new XMLHttpRequest();
        xhr.addEventListener("load", () => {
            if (xhr.status === 200) {
                window.location = "signup";
            } else {
                alert("Error");
            }
        });
        xhr.addEventListener('error', _ => {
            alert('Error');
        });
        xhr.open("POST", "signup");
        xhr.setRequestHeader("Content-Type", "application/json");
        xhr.send(JSON.stringify(formData));
    }
});
</script>

Progress?

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