init

_config/config.yml

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+---
+Name: thermotex
+---
+
+SilverStripe\SiteConfig\SiteConfig:
+  extensions:
+    - GDPRSiteConfigExtension

composer.json

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+{
+    "name":"innomedia/GDPR",
+    "description": "Silverstripe 4 GDPR",
+    "authors": [
+      {
+        "name":"Innomedia AG",
+        "email": "bk@innomedia.de"
+      }
+    ],
+    "autoload": {
+      "psr-4": {
+        "GDPR\\": "src/"
+      }
+    }
+  }
+

src/GDPRFormPageExtension.php

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+<?php
+use SilverStripe\Core\Extension;
+use SilverStripe\Forms\CheckboxField;
+use SilverStripe\SiteConfig\SiteConfig;
+class GDPRFormPageExtension extends Extension
+{
+    // Add $this->extend('updateFormWithGDPRFields', $fields,$requirements);
+    // To Form after all Fields have been added
+    public function updateFormWithGDPRFields($fields,$requirements)
+    {
+        $siteconfig = SiteConfig::get()->first();
+        if($siteconfig->FormularDatenschutztext != "")
+        {
+            $fields->push($GDPRField = CheckboxField::create(
+                'DataProtection',
+                'DataProtection'
+            ));
+            if($siteconfig->ExtraCSS != "")
+            {
+                $GDPRField->addExtraClass($siteconfig->ExtraCSS);
+            }
+            $GDPRField->setTemplate("GDPRCheckboxField");
+            $GDPRField->setFieldHolderTemplate("GDPRFieldHolder");
+            $requirements->addRequiredField("DataProtection");
+        }
+    }
+}

src/GDPRSiteConfigExtension.php

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+<?php
+use SilverStripe\Forms\FieldList;
+use SilverStripe\ORM\DataExtension;
+use SilverStripe\Forms\HTMLEditor\HTMLEditorField;
+use SilverStripe\Forms\TextField;
+
+class GDPRSiteConfigExtension extends DataExtension
+{
+    /**
+     * Database fields
+     * @var array
+     */
+    private static $db = array(
+        'FormularDatenschutztext' => 'HTMLText',
+        'ExtraCSS'  =>'Text'
+    );
+    /**
+     * Update Fields
+     * @return FieldList
+     */
+    public function updateCMSFields(FieldList $fields)
+    {
+        $owner = $this->owner;
+        $fields->addFieldToTab(
+            'Root.FormularDatenschutz',
+            HtmlEditorField::create(
+                'FormularDatenschutztext',
+                'Formular Datenschutz Text'
+            )
+        );
+        $fields->addFieldToTab(
+            'Root.FormularDatenschutz',
+            TextField::create(
+                'ExtraCSS',
+                'CSS'
+            )
+        );
+        return $fields;
+    }
+}

src/GPDREditableCheckbox.php

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+<?php
+
+use SilverStripe\Forms\CheckboxField;
+use SilverStripe\UserForms\Model\EditableFormField;
+
+if (!class_exists(EditableFormField::class)) {
+    return;
+}
+/**
+ * EditableCheckbox
+ *
+ * A user modifiable checkbox on a UserDefinedForm
+ *
+ * @package userforms
+ */
+
+class GPDREditableCheckbox extends EditableFormField
+{
+    private static $singular_name = 'Datenschutz Feld';
+
+    private static $plural_name = 'Datenschutz Felder';
+
+    protected $jsEventHandler = 'click';
+
+    private static $db = [
+        'CheckedDefault' => 'Boolean' // from CustomSettings
+    ];
+
+    private static $table_name = 'EditableDatenschutzCheckbox';
+
+    /**
+     * @return FieldList
+     */
+    public function getCMSFields()
+    {
+        $fields = parent::getCMSFields();
+
+        $fields->replaceField('Default', CheckboxField::create(
+            "CheckedDefault",
+            _t('SilverStripe\\UserForms\\Model\\EditableFormField.CHECKEDBYDEFAULT', 'Checked by Default?')
+        ));
+
+        return $fields;
+    }
+
+    public function getFormField()
+    {
+        $field = CheckboxField::create($this->Name, $this->Title ?: false, $this->CheckedDefault)
+            ->setFieldHolderTemplate("GDPRFieldHolder")
+            ->setTemplate("GDPRCheckboxField");
+
+        $this->doUpdateFormField($field);
+
+        return $field;
+    }
+
+    public function getValueFromData($data)
+    {
+        $value = (isset($data[$this->Name])) ? $data[$this->Name] : false;
+
+        return ($value)
+            ? _t('SilverStripe\\UserForms\\Model\\EditableFormField.YES', 'Yes')
+            : _t('SilverStripe\\UserForms\\Model\\EditableFormField.NO', 'No');
+    }
+
+    public function isCheckBoxField()
+    {
+        return true;
+    }
+}

templates/GDPRCheckboxField.ss

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+<div class="contactGDPR">
+    <input $AttributesHTML />
+    <label>{$SiteConfig.FormularDatenschutztext}</label>
+</div>
+<style>
+    .contactGDPR
+    {
+        margin-top:20px;
+    }
+    .contactGDPR label
+    {
+        display:inline-block !important;
+        position: relative;
+        top:-3px;
+        width: calc(100% - 40px);
+        text-transform: none;
+    }
+    .contactGDPR label p:last-child
+    {
+        margin-bottom:0;
+    }
+    .contactGDPR input.checkbox
+    {
+        height:auto !important;
+        width:30px !important;
+        display:inline-block !important;
+        float:left;
+        position: relative;
+        top:-3px;
+    }
+</style>

templates/GDPRFieldHolder.ss

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+<div id="$HolderID" class="field $SiteConfig.ExtraCSS">
+    $Field
+</div>

templates/UserFormsHTMLCheckboxField.ss

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+<div class="contactGDPR">
+    <input $AttributesHTML<% if $RightTitle %>aria-describedby="{$Name}_right_title" <% end_if %>/>
+    <label>{$SiteConfig.FormularDatenschutztext}</label>
+</div>
+<style>
+    .contactGDPR
+    {
+        margin-top:20px;
+    }
+    .contactGDPR label
+    {
+        display:inline-block;
+        position: relative;
+        top:-3px;
+        width: calc(100% - 40px);
+        text-transform: none;
+        padding-left:30px !important;
+    }
+    .contactGDPR label p:last-child
+    {
+        margin-bottom:0;
+    }
+    .contactGDPR input.checkbox
+    {
+        height:auto !important;
+        width:30px !important;
+        display:inline-block !important;
+        margin-left:0;
+        float:left;
+        position:relative !important;
+        top:-3px;
+    }
+</style>