Refs #9691: HTML ID for checkbox elements

extension/Classes/Core/AbstractBuildForm.php

@@ -2257,6 +2257,8 @@ abstract class AbstractBuildForm {
         if ($formElement[FE_MODE] == FE_MODE_READONLY) {
             $checkboxClass .= ' qfq-disabled'; // necessary for own style checkboxes to display them 'disabled'
         }
+        // Used in getFormElementForJson() for dynamic update.
+        $formElement['_checkboxClass'] = $checkboxClass;
 
         $br = '';
 
@@ -2265,7 +2267,8 @@ abstract class AbstractBuildForm {
             $jsonValue = false;
             $attribute = $attributeBase;
             $htmlFormElementNameUniq = HelperFormElement::prependFormElementNameCheckBoxMulti($htmlFormElementName, $ii, true);
-            $attribute .= Support::doAttribute('id', $formElement[FE_HTML_ID] . '-' . $ii);
+            $checkboxId = $this->checkboxRadioOptionId($formElement[FE_HTML_ID], $ii);
+            $attribute .= Support::doAttribute('id', $checkboxId);
             $attribute .= Support::doAttribute('name', $htmlFormElementNameUniq);
             $attribute .= Support::doAttribute(ATTRIBUTE_DATA_REFERENCE, $formElement[FE_DATA_REFERENCE] . '-' . $ii);
 
@@ -2294,7 +2297,8 @@ abstract class AbstractBuildForm {
 //                $htmlElement = Support::wrapTag('<label>', $htmlElement);
 //            }
 
-            $htmlElement = Support::wrapTag("<label class='$checkboxClass' $attributeBaseLabel>", $htmlElement, true);
+            $checkboxLabelId = $this->checkboxRadioOptionId($formElement[FE_HTML_ID], $ii, 'l');
+            $htmlElement = Support::wrapTag("<label class='$checkboxClass' $attributeBaseLabel id='$checkboxLabelId'>", $htmlElement, true);
 
             // control orientation
             if ($formElement[FE_MAX_LENGTH] > 1) {
@@ -2315,6 +2319,23 @@ abstract class AbstractBuildForm {
         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 $type -  ';' for label
+     * @return string
+     */
+    private function checkboxRadioOptionId($base, $index, $type = '') {
+        if ($type != '') {
+            $type = '-' . $type;
+        }
+        return $base . '-' . $index . $type;
+
+    }
     /**
      * Submit extra (hidden) values by SIP.
      *