<?php
use phpformbuilder\Form;
use phpformbuilder\Validator\Validator;
/* =============================================
start session and include form class
============================================= */
session_start();
include_once rtrim($_SERVER['DOCUMENT_ROOT'], DIRECTORY_SEPARATOR) . '/phpformbuilder/Form.php';
/* =============================================
validation if posted
============================================= */
if ($_SERVER["REQUEST_METHOD"] == "POST" && Form::testToken('dependent-fields') === true) {
// create validator & auto-validate required fields
$validator = Form::validate('dependent-fields');
// additional validation
$validator->email()->validate('user-email');
// hcaptcha validation
$validator->hcaptcha('YOUR_HCAPTCHA_SECRET_KEY', 'Captcha Error')->validate('h-captcha-response');
// check for errors
if ($validator->hasErrors()) {
$_SESSION['errors']['dependent-fields'] = $validator->getAllErrors();
} else {
$email_config = array(
'sender_email' => 'contact@phpformbuilder.pro',
'sender_name' => 'Php Form Builder',
'recipient_email' => addslashes($_POST['user-email']),
'subject' => 'Php Form Builder - Contact Form',
'filter_values' => 'dependent-fields'
);
$sent_message = Form::sendMail($email_config);
Form::clear('dependent-fields');
}
}
/* ==================================================
The Form
================================================== */
$form = new Form('dependent-fields', 'horizontal', 'novalidate', 'bs4');
$form->setMode('development');
/* Select */
$form->startFieldset('Hidden fields depend on Select value', '', 'class=text-center mb-4');
$form->addHelper('If other, please tell us more ... ', 'subject');
$form->addOption('subject', 'Support', 'Support', '', 'data-icon=fas fa-info-circle mr-2');
$form->addOption('subject', 'Sales', 'Sales', '', 'data-icon=fas fa-dollar-sign mr-2');
$form->addOption('subject', 'Other', 'Other', '', 'data-icon=fas fa-question-circle mr-2');
$form->addSelect('subject', 'Your request concerns ...', 'class=selectpicker, required');
$form->startDependentFields('subject', 'Other');
$form->addInput('text', 'subject-other', '', '', 'placeholder=Please tell more about your request ...');
$form->endDependentFields();
// preselect US
if (!isset($_SESSION['dependent-fields']['country'])) {
$_SESSION['dependent-fields']['country'] = 'US';
}
$form->addHelper('Enter Additional informations if <strong>non-US</strong>', 'country');
$options = array(
'plugin' => 'bootstrap-select',
'lang' => 'en',
'flags' => true,
'flag_size' => 16,
'return_value' => 'code',
);
$form->addCountrySelect('country', 'country: ', 'title=Select a country', $options);
// Inverted Dependent field - if non-US selected
$form->startDependentFields('country', 'US', true);
$form->addTextarea('additional-informations', '', 'Additional informations', 'rows=7');
$form->endDependentFields();
$form->endFieldset();
/* Radio */
$form->startFieldset('Hidden fields depend on Radio value', '', 'class=text-center mb-4');
$form->setCols(0, 12);
$form->addRadio('radio_group_1', 'Show dependent fields', 1);
$form->addRadio('radio_group_1', 'Hide dependent fields', 0);
$form->printRadioGroup('radio_group_1', '', true, 'required');
$form->startDependentFields('radio_group_1', 1);
$form->groupElements('civility', 'name');
$form->setCols(3, 2);
$form->addOption('civility', 'M.', 'M.');
$form->addOption('civility', 'Mrs', 'M<sup>rs</sup>');
$form->addOption('civility', 'Ms', 'M<sup>s</sup>');
$form->addSelect('civility', 'Civility', 'data-slimselect=true, required');
$form->setCols(2, 5);
$form->addInput('text', 'name', '', 'Name', 'required');
$form->setCols(3, 9);
// Dependent field inside previous one
$form->startDependentFields('civility', 'Mrs');
$form->addInput('text', 'maiden_name', '', 'Maiden Name');
$form->endDependentFields();
$form->endDependentFields();
$form->endFieldset();
/* Checkbox */
$form->startFieldset('Hidden fields depend on Checkbox value', '', 'class=text-center mb-4');
$form->addCheckbox('checkbox_group_1', 'Show', 1);
$form->addCheckbox('checkbox_group_1', 'Do nothing special', 0);
$form->printCheckboxGroup('checkbox_group_1', 'Show dependent field if "show" is checked');
$form->startDependentFields('checkbox_group_1', 1);
$form->addInput('text', 'your_name', '', 'Your Name');
$form->endDependentFields();
$form->addCheckbox('checkbox_group_2', 'Red', 'Red');
$form->addCheckbox('checkbox_group_2', 'Blue', 'Blue');
$form->addCheckbox('checkbox_group_2', 'Green', 'Green');
$form->addCheckbox('checkbox_group_2', 'Yellow', 'Yellow');
$form->printCheckboxGroup('checkbox_group_2', 'Show dependent field if any other than 1st is checked');
$form->startDependentFields('checkbox_group_2', 'Red', true);
$form->addRadio('are_you_sure', 'No', 0);
$form->addRadio('are_you_sure', 'Yes', 1);
$form->printRadioGroup('are_you_sure', 'Are you sure ?');
$form->endDependentFields();
$form->endFieldset();
/* Nested */
$form->startFieldset('Nested dependent fields', '', 'class=text-center mb-4');
$form->addRadio('level_1', 'Show level 1', 1);
$form->addRadio('level_1', 'Hide level 1', 0);
$form->printRadioGroup('level_1', '', true, 'required');
// START level 1
$form->startDependentFields('level_1', 1);
$form->addRadio('level_2', 'Show level 2', 1);
$form->addRadio('level_2', 'Hide level 2', 0);
$form->printRadioGroup('level_2', '', true, 'required');
// START level 2
$form->startDependentFields('level_2', 1);
$form->addInput('text', 'level-2-field', '', 'Level 2 field', 'required');
// END level 2
$form->endDependentFields();
// END level 1
$form->endDependentFields();
$form->endFieldset();
$form->addInput('email', 'user-email', '', 'Your email', 'required');
$form->setCols(0, 12);
$form->centerContent();
$form->addHcaptcha('YOUR_HCAPTCHA_SITE_KEY', 'class=text-center');
$form->addBtn('submit', 'submit-btn', 1, 'Send <i class="fas fa-envelope ml-2" aria-hidden="true"></i>', 'class=btn btn-primary, data-ladda-button=true, data-style=zoom-in');
// Custom radio & checkbox css
$form->addPlugin('pretty-checkbox', '#dependent-fields');
// Javascript validation
$form->addPlugin('formvalidation', '#dependent-fields');
?>
<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Bootstrap 4 Dependent fields Form - How to create PHP forms easily</title>
<meta name="description" content="Bootstrap 4 Form Generator - how to create a Form with Dependent fields using Php Form Builder">
<link rel="canonical" href="https://www.phpformbuilder.pro/templates/bootstrap-4-forms/dependent-fields.php" />
<!-- Bootstrap 4 CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css" integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous">
<!-- Font awesome icons -->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.15.4/css/solid.css" integrity="sha384-Tv5i09RULyHKMwX0E8wJUqSOaXlyu3SQxORObAI08iUwIalMmN5L6AvlPX2LMoSE" crossorigin="anonymous">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.15.4/css/fontawesome.css" integrity="sha384-jLKHWM3JRmfMU0A5x5AkjWkw/EYfGUAGagvnfryNV3F9VqM98XiIH7VBGVoxVSc7" crossorigin="anonymous">
<?php $form->printIncludes('css'); ?>
<style>
fieldset {
margin-bottom: 40px;
padding: 20px 15px;
background: #f7f7f7;
}
legend {
padding: 5px 10px;
font-size: 1.1rem;
color: #fff;
background: #666;
}
</style>
</head>
<body>
<h1 class="text-center">Php Form Builder - Bootstrap 4 Form with Dependent fields<br><small>Hidden fields shown if special values selected</small></h1>
<div class="container">
<div class="row justify-content-center">
<div class="col-md-11 col-lg-10">
<div class="text-center mb-5">
<a href="https://www.phpformbuilder.pro/documentation/javascript-plugins.php#dependent-fields-example" class="btn btn-secondary btn-sm"><strong>Dependent fields</strong> - documentation here <i class="fas fa-arrow-right ml-2"></i></a>
</div>
<?php
if (isset($sent_message)) {
echo $sent_message;
}
$form->render();
?>
</div>
</div>
</div>
<!-- jQuery -->
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
<!-- Bootstrap 4 JavaScript -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/js/bootstrap.bundle.min.js" integrity="sha384-Piv4xVNRyMGpqkS2by6br4gNJ7DXjqk09RmUpJ8jgGtD7zP9yug3goQfGII0yAns" crossorigin="anonymous"></script>
<?php
$form->printIncludes('js');
$form->printJsCode();
?>
</body>
</html>