Php Form Builder - Bootstrap Form with Dependent fields
Hidden fields shown if special values selected

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PHP Form Builder's Material Forms can be built with Bootstrap 4 or Materialize framework.

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Material Design is a customized version of Materialize framework containing only the minimal css/js required for forms.
These forms are using PHP Form Builder's materialize plugin

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Materialize is the framework used as the main css on your page
These forms don't use any extra plugin

Detailed explanations here: Material Design Forms

Hidden fields depend on Select value

Your request concerns ... ^*

If other, please tell us more ...

country:

Enter Additional informations if non-US

Additional informations

Hidden fields depend on Radio value

Show dependent fieldsHide dependent fields

Civility ^*

Name ^*

Maiden Name

Hidden fields depend on Checkbox value

Show dependent field if "show" is checked

ShowDo nothing special

Your Name

Show dependent field if any other than 1st is checked

RedBlueGreenYellow

Are you sure ?

NoYes

Nested dependent fields

Show level 1Hide level 1

Show level 2Hide level 2

Level 2 field ^*

Bootstrap Dependent fields Form - How to create PHP forms easily Source Code

×

<?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

    // recaptcha validation
    $validator->recaptcha('6LeNWaQUAAAAAOnei_86FAp7aRZCOhNwK3e2o2x2', 'Recaptcha Error')->validate('g-recaptcha-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' => 'gilles.migliori@gmail.com',
            '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', 'material');
// $form->setMode('development');

// materialize plugin
$form->addPlugin('materialize', '#dependent-fields');

$form->setCols(4, 8);

/* Select */

$form->startFieldset('Hidden fields depend on Select value');
$form->addHelper('If other, please tell us more ... ', 'subject');
$form->addOption('subject', 'Support', 'Support', '', 'data-icon=fa fa-info-circle');
$form->addOption('subject', 'Sales', 'Sales', '', 'data-icon=fa fa-usd');
$form->addOption('subject', 'Other', 'Other', '', 'data-icon=fa fa-question-circle');
$form->addSelect('subject', 'Your request concerns ...', 'class=selectpicker no-autoinit, 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'    => 32,
    'return_value' => 'code',
);
$form->addCountrySelect('country', 'country: ', 'class=no-autoinit, title=Select a country', $options);

// Inverted Dependent field - if non-US selected
$form->startDependentFields('country', 'US', true);
$form->addTextarea('additional-informations', '', 'Additional informations');
$form->endDependentFields();
$form->endFieldset();

/* Radio */

$form->startFieldset('Hidden fields depend on Radio value');
$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->groupInputs('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', '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');
$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');
$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->setCols(3, 9, 'sm');
$form->addRecaptchaV3('6LeNWaQUAAAAAGO_c1ORq2wla-PEFlJruMzyH5L6', 'mb-dependent-fields');
$form->addBtn('reset', 'reset-btn', 1, 'Reset <i class="fa fa-ban" aria-hidden="true"></i>', 'class=btn btn-warning', 'my-btn-group');
$form->addBtn('submit', 'submit-btn', 1, 'Send <i class="fa fa-envelope ml-2" aria-hidden="true"></i>', 'class=btn btn-success ladda-button, data-style=zoom-in', 'my-btn-group');
$form->printBtnGroup('my-btn-group');

// jQuery validation
$form->addPlugin('formvalidation', '#dependent-fields');
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap Dependent fields Form - How to create PHP forms easily</title>
    <meta name="description" content="Bootstrap Form Generator - how to create a Form with Dependent fields using Php Form Builder Class">
    <link rel="canonical" href="https://www.phpformbuilder.pro/templates/material-bootstrap-forms/dependent-fields.php" />

    <!-- Bootstrap 4 CSS -->

    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

    <!-- font-awesome CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
    <?php $form->printIncludes('css'); ?>
    <style type="text/css">
        fieldset {
            margin-bottom: 80px;
        }
    </style>
</head>
<body>
    <h1 class="text-center">Php Form Builder - Bootstrap Form with Dependent fields<br><small>Hidden fields shown if special values selected</small></h1>
    <div class="container">
        <?php
            // information for users - remove this in your forms
            include_once '../assets/material-bootstrap-forms-notice.php';
        ?>

        <div class="row justify-content-center">
            <div class="col-md-11 col-lg-10">
            <?php
            if (isset($sent_message)) {
                echo $sent_message;
            }
            $form->render();
            ?>
            </div>
        </div>
    </div>

    <!-- jQuery -->

    <script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>

    <!-- Bootstrap 4 JavaScript -->

    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
    <?php
        $form->printIncludes('js');
        $form->printJsCode();
    ?>
</body>
</html>

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