AJAX Example

This example shows how to submit a form and handle validation via AJAX. It uses a route as endpoint for the form submission. The action of the route is similar to the page controller code you have seen in the other examples. This form is equivalent to the basic example.


The route listens for POST requests on /contact. Note the use of withoutFlashing and withoutRedirect because we don't need the default behaviour here.

    'pattern' => 'contact',
    'method' => 'POST',
    'action' => function () {
        $form = new \Uniform\Form([
            'email' => [
                'rules' => ['required', 'email'],
                'message' => 'Please enter a valid email address',
            'name' => [],
            'message' => [
                'rules' => ['required'],
                'message' => 'Please enter a message',

        // Perform validation and execute guards.

        if (!$form->success()) {
            // Return validation errors.
            return Response::json($form->errors(), 400);

        // If validation and guards passed, execute the action.
            'to' => 'me@example.com',
            'from' => 'info@example.com',

        if (!$form->success()) {
            // This should not happen and is our fault.
            return Response::json($form->errors(), 500);

        // Return code 200 on success.
        return Response::json([], 200);


This is the /contact page. If your page has another URL, update the form action URL or the route pattern accordingly.

<h1><?php echo $page->title()->html() ?></h1>

<style type="text/css">
    label, input, textarea {
        display: block;
    .uniform__potty {
        position: absolute;
        left: -9999px;
    .error {
        border: 1px solid red;

<form action="<?php echo $page->url() ?>" method="POST">
    <input name="email" type="email">

    <input name="name" type="text">

    <textarea name="message"></textarea>

    <?php echo csrf_field() ?>
    <?php echo honeypot_field() ?>
    <input type="submit" value="Submit">
    <p id="message"></p>


This simple example works fine with Vanilla JavaScript in modern browsers. But you probably want to use some JS framework for your production site.

window.addEventListener('load', function () {
    var form = document.querySelector('form');
    var message = document.getElementById('message');
    var fields = {};
    form.querySelectorAll('[name]').forEach(function (field) {
        fields[field.name] = field;

    // Displays all error messages and adds 'error' classes to the form fields with
    // failed validation.
    var handleError = function (response) {
        var errors = [];
        for (var key in response) {
            if (!response.hasOwnProperty(key)) continue;
            if (fields.hasOwnProperty(key)) fields[key].classList.add('error');
            Array.prototype.push.apply(errors, response[key]);
        message.innerHTML = errors.join('<br>');

    var onload = function (e) {
        if (e.target.status === 200) {
            message.innerHTML = 'Success!'
        } else {

    var submit = function (e) {
        var request = new XMLHttpRequest();
        request.open('POST', e.target.action);
        request.onload = onload;
        request.send(new FormData(e.target));
        // Remove all 'error' classes of a possible previously failed validation.
        for (var key in fields) {
            if (!fields.hasOwnProperty(key)) continue;
    form.addEventListener('submit', submit);