Refactor to new class Checkbox() finished.

extension/Classes/Core/BuildFormBootstrap.php

@@ -807,7 +807,7 @@ EOF;
 
         // Label
         if ($formElement[FE_BS_LABEL_COLUMNS] != '0') {
-            $htmlLabel = $this->buildLabel($htmlFormElementName, $formElement[FE_LABEL], $addClassRequired[FE_LABEL] ?? '');
+            $htmlLabel = HelperFormElement::buildLabel($htmlFormElementName, $formElement[FE_LABEL], $addClassRequired[FE_LABEL] ?? '');
         }
 
         $html .= $this->customWrap($formElement, $htmlLabel, FE_WRAP_LABEL, $formElement[FE_BS_LABEL_COLUMNS],

extension/Classes/Core/Helper/HelperFormElement.php

@@ -20,7 +20,7 @@ class HelperFormElement {
     /**
      * @var Store
      */
-    protected $store = null;
+    private static $store = null;
 
     /**
      * Expand column $keyName to row array as virtual columns.
@@ -790,4 +790,74 @@ EOF;
         return $attribute;
     }
 
+    /**
+     * Builds a real HTML hidden form element. Useful for checkboxes, Multiple-Select and Radios.
+     *
+     * @param        $htmlFormElementName
+     * @param string $value
+     *
+     * @return string
+     */
+    public static function buildNativeHidden($htmlFormElementName, $value) {
+        return '<input type="hidden" name="' . $htmlFormElementName . '" value="' . htmlentities($value) . '">';
+    }
+
+    /**
+     * Set corresponding JSON attributes readonly/required/disabled, based on $formElement[FE_MODE].
+     *
+     * @param string $feMode
+     *
+     * @return array
+     * @throws \UserFormException
+     */
+    public static function getJsonFeMode($feMode) {
+
+        self::getFeMode($feMode, $dummy, $disabled, $required);
+
+        return [API_FORM_UPDATE_DISABLED => ($disabled === 'yes'), API_FORM_UPDATE_REQUIRED => ($required === 'yes')];
+    }
+
+    /**
+     * Builds a label, typically for an html-'<input>'-element.
+     *
+     * @param string $htmlFormElementName
+     * @param string $label
+     * @param string $addClass
+     *
+     * @return string
+     * @throws \CodeException
+     */
+    public static function buildLabel($htmlFormElementName, $label, $addClass = '') {
+        $attributes = Support::doAttribute('for', $htmlFormElementName);
+        $attributes .= Support::doAttribute('class', ['control-label', $addClass]);
+
+        $html = Support::wrapTag("<label $attributes>", $label);
+
+        return $html;
+    }
+
+    /**
+     * Construct HTML ID for checkbox/radio option elements.
+     * Optional add $type.
+     * Example: $base='173-21612-1-0', $index='0', $type='l' >> '173-21612-1-0-0-l'
+     *
+     * @param $base
+     * @param $index
+     * @param string $type -  ';' for label
+     * @return string
+     */
+    public static function getCheckboxRadioOptionId($base, $index, $type = '') {
+        return $base . '-' . $index . $type;
+    }
+
+    /**
+     * Build HelpBlock
+     *
+     * @return string
+     */
+    public static function getHelpBlock() {
+        return '<div class="help-block with-errors hidden"></div>';
+    }
+
+
 }
\ No newline at end of file