diff --git a/administrator/components/com_config/tmpl/component/default.php b/administrator/components/com_config/tmpl/component/default.php
index eb04970f2b824..37407f53a80e5 100644
--- a/administrator/components/com_config/tmpl/component/default.php
+++ b/administrator/components/com_config/tmpl/component/default.php
@@ -66,7 +66,13 @@
                     <?php $dataShowOn = ''; ?>
                     <?php if (!empty($fieldSet->showon)) : ?>
                         <?php $wa->useScript('showon'); ?>
-                        <?php $dataShowOn = ' data-showon=\'' . json_encode(FormHelper::parseShowOnConditions($fieldSet->showon, $this->formControl)) . '\''; ?>
+                        <?php $dataShowOn = ' data-showon=\'' . json_encode(FormHelper::parseFieldConditions($fieldSet->showon, $this->formControl)) . '\''; ?>
+                    <?php endif; ?>
+
+                    <?php $dataRequireOn = ''; ?>
+                    <?php if (!empty($fieldSet->requireon)) : ?>
+                        <?php $wa->useScript('requireon'); ?>
+                        <?php $dataRequireOn = ' data-requireon=\'' . json_encode(FormHelper::parseFieldConditions($fieldSet->requireon, $this->formControl)) . '\''; ?>
                     <?php endif; ?>
 
                     <?php $label = empty($fieldSet->label) ? 'COM_CONFIG_' . $name . '_FIELDSET_LABEL' : $fieldSet->label; ?>
diff --git a/build/media_source/system/joomla.asset.json b/build/media_source/system/joomla.asset.json
index 56bb579487c6a..f69110baa6bc3 100644
--- a/build/media_source/system/joomla.asset.json
+++ b/build/media_source/system/joomla.asset.json
@@ -145,6 +145,30 @@
         "type": "module"
       }
     },
+    {
+      "name": "requireon.es5",
+      "type": "script",
+      "dependencies": [
+        "core"
+      ],
+      "uri": "system/requireon-es5.min.js",
+      "attributes": {
+        "defer": true,
+        "nomodule": true
+      }
+    },
+    {
+      "name": "requireon",
+      "type": "script",
+      "dependencies": [
+        "core",
+        "requireon.es5"
+      ],
+      "uri": "system/requireon.min.js",
+      "attributes": {
+        "type": "module"
+      }
+    },
     {
       "name": "switcher",
       "type": "style",
diff --git a/build/media_source/system/js/requireon.es6.js b/build/media_source/system/js/requireon.es6.js
new file mode 100644
index 0000000000000..f7f02a619a670
--- /dev/null
+++ b/build/media_source/system/js/requireon.es6.js
@@ -0,0 +1,306 @@
+/**
+ * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+/**
+ * JField 'requireon' class
+ */
+class Requireon {
+  /**
+   * Constructor
+   *
+   * @param {HTMLElement} cont Container element
+   */
+  constructor(cont) {
+    const self = this;
+    this.container = cont || document;
+    this.fields = {// origin-field-name: {
+      //   origin:  ['collection of all the trigger nodes'],
+      //   targets: ['collection of nodes to be controlled control']
+      // }
+    };
+    this.requireonFields = [].slice.call(this.container.querySelectorAll('[data-requireon]')); // Populate the fields data
+
+    if (this.requireonFields.length) {
+      // @todo refactor this, dry
+      this.requireonFields.forEach((field) => {
+        // Set up only once
+        if (field.hasAttribute('data-requireon-initialised')) {
+          return;
+        }
+
+        field.setAttribute('data-requireon-initialised', '');
+        const jsondata = field.getAttribute('data-requireon') || '';
+        const requireonData = JSON.parse(jsondata);
+
+        let localFields;
+
+        if (requireonData.length) {
+          localFields = [].slice.call(self.container.querySelectorAll(`[name="${requireonData[0].field}"], [name="${requireonData[0].field}[]"]`));
+
+          if (!this.fields[requireonData[0].field]) {
+            this.fields[requireonData[0].field] = {
+              origin: [],
+              targets: [],
+            };
+          } // Add trigger elements
+
+          localFields.forEach((cField) => {
+            if (this.fields[requireonData[0].field].origin.indexOf(cField) === -1) {
+              this.fields[requireonData[0].field].origin.push(cField);
+            }
+          }); // Add target elements
+
+          this.fields[requireonData[0].field].targets.push(field); // Data requireon can have multiple values
+
+          if (requireonData.length > 1) {
+            requireonData.forEach((value, index) => {
+              if (index === 0) {
+                return;
+              }
+
+              localFields = [].slice.call(self.container.querySelectorAll(`[name="${value.field}"], [name="${value.field}[]"]`));
+
+              if (!this.fields[requireonData[0].field]) {
+                this.fields[requireonData[0].field] = {
+                  origin: [],
+                  targets: [],
+                };
+              } // Add trigger elements
+
+              localFields.forEach((cField) => {
+                if (this.fields[requireonData[0].field].origin.indexOf(cField) === -1) {
+                  this.fields[requireonData[0].field].origin.push(cField);
+                }
+              }); // Add target elements
+
+              if (this.fields[requireonData[0].field].targets.indexOf(field) === -1) {
+                this.fields[requireonData[0].field].targets.push(field);
+              }
+            });
+          }
+        }
+      }); // Do some binding
+
+      this.linkedOptions = this.linkedOptions.bind(this); // Attach events to referenced element, to check condition on change and keyup
+
+      Object.keys(this.fields).forEach((key) => {
+        if (this.fields[key].origin.length) {
+          this.fields[key].origin.forEach((elem) => {
+            // Initialize the requireon behaviour for the given HTMLElement
+            self.linkedOptions(key); // Setup listeners
+
+            elem.addEventListener('change', () => {
+              self.linkedOptions(key);
+            });
+            elem.addEventListener('keyup', () => {
+              self.linkedOptions(key);
+            });
+            elem.addEventListener('click', () => {
+              self.linkedOptions(key);
+            });
+          });
+        }
+      });
+    }
+  }
+
+  /**
+   *
+   * @param key
+   */
+  linkedOptions(key) {
+    // Loop through the elements that need to be either mandatory or optional
+    this.fields[key].targets.forEach((field) => {
+      const elementRequireonDatas = JSON.parse(field.getAttribute('data-requireon')) || [];
+      let requirefield = true;
+      let itemval; // Check if target conditions are satisfied
+
+      elementRequireonDatas.forEach((elementRequireonData, index) => {
+        const condition = elementRequireonData || {};
+        condition.valid = 0; // Test in each of the elements in the field array if condition is valid
+
+        this.fields[key].origin.forEach((originField) => {
+          if (originField.name.replace('[]', '') !== elementRequireonData.field) {
+            return;
+          }
+
+          const originId = originField.id; // If checkbox or radio box the value is read from properties
+
+          if (originField.getAttribute('type') && ['checkbox', 'radio'].includes(originField.getAttribute('type').toLowerCase())) {
+            if (!originField.checked) {
+              // Unchecked fields will return a blank and so always match
+              // a != condition so we skip them
+              return;
+            }
+
+            itemval = document.getElementById(originId).value;
+          } else if (originField.nodeName === 'SELECT' && originField.hasAttribute('multiple')) {
+            itemval = Array.from(originField.querySelectorAll('option:checked')).map((el) => el.value);
+          } else {
+            // Select lists, text-area etc. Note that multiple-select list returns
+            // an Array here s0 we can always treat 'itemval' as an array
+            itemval = document.getElementById(originId).value; // A multi-select <select> $field  will return null when no elements are
+            // selected so we need to define itemval accordingly
+
+            if (itemval === null && originField.tagName.toLowerCase() === 'select') {
+              itemval = [];
+            }
+          } // Convert to array to allow multiple values in the field (e.g. type=list multiple)
+          // and normalize as string
+
+          if (!(typeof itemval === 'object')) {
+            itemval = JSON.parse(`["${itemval}"]`);
+          } // Test if any of the values of the field exists in requireon conditions
+
+          itemval.forEach((val) => {
+            // ":" Equal to one or more of the values condition
+            if (condition.sign === '=' && condition.values.indexOf(val) !== -1) {
+              condition.valid = 1;
+            } // "!:" Not equal to one or more of the values condition
+
+            if (condition.sign === '!=' && condition.values.indexOf(val) === -1) {
+              condition.valid = 1;
+            }
+          });
+        }); // Verify conditions
+        // First condition (no operator): current condition must be valid
+
+        if (condition.op === '') {
+          if (condition.valid === 0) {
+            requirefield = false;
+          }
+        } else {
+          // Other conditions (if exists)
+          // AND operator: both the previous and current conditions must be valid
+          if (condition.op === 'AND' && condition.valid + elementRequireonDatas[index - 1].valid < 2) {
+            requirefield = false;
+            condition.valid = 0;
+          } // OR operator: one of the previous and current conditions must be valid
+
+          if (condition.op === 'OR' && condition.valid + elementRequireonDatas[index - 1].valid > 0) {
+            requirefield = true;
+            condition.valid = 1;
+          }
+        }
+      }); // If conditions are satisfied require the target field(s), else un-require
+
+      if (field.tagName !== 'option') {
+        // Get the indicator of requiredness...
+        const star = field.getElementsByClassName('star');
+
+        if (requirefield) {
+          if (star.length) {
+            star[0].classList.remove('hidden');
+          }
+
+          if (field.getElementsByTagName('select').length > 0) {
+            field.getElementsByTagName('select')[0].setAttribute('required', '');
+          } else if (field.getElementsByTagName('textarea').length > 0) {
+            field.getElementsByTagName('textarea')[0].setAttribute('required', '');
+          } else if (field.getElementsByTagName('input').length > 0) {
+            field.getElementsByTagName('input')[0].setAttribute('required', '');
+          }
+
+          field.dispatchEvent(new CustomEvent('joomla:requireon-mandatory', {
+            bubbles: true,
+          }));
+        } else {
+          if (star.length) {
+            star[0].classList.add('hidden');
+          }
+
+          if (field.getElementsByTagName('select').length > 0) {
+            field.getElementsByTagName('select')[0].removeAttribute('required');
+          } else if (field.getElementsByTagName('textarea').length > 0) {
+            field.getElementsByTagName('textarea')[0].removeAttribute('required');
+          } else if (field.getElementsByTagName('input').length > 0) {
+            field.getElementsByTagName('input')[0].removeAttribute('required');
+          }
+
+          field.dispatchEvent(new CustomEvent('joomla:requireon-optional', {
+            bubbles: true,
+          }));
+        }
+      } else {
+        // @todo: If chosen or choices.js is active we should update them
+        field.disabled = !requirefield;
+      }
+    });
+  }
+}
+
+if (!window.Joomla) {
+  throw new Error('Joomla API is not properly initialized');
+} // Provide a public API
+
+if (!Joomla.Requireon) {
+  Joomla.Requireon = {
+    initialise: (container) => new Requireon(container),
+  };
+}
+
+/**
+ * Initialize 'requireon' feature at an initial page load
+ */
+Joomla.Requireon.initialise(document);
+/**
+ * Search for matching parents
+ *
+ * @param {HTMLElement} $child
+ * @param {String} selector
+ * @returns {HTMLElement[]}
+ */
+
+const getMatchedParents = ($child, selector) => {
+  let $parent = $child;
+  let $matchingParent;
+  const parents = [];
+
+  while ($parent) {
+    $matchingParent = $parent.matches && $parent.matches(selector) ? $parent : null;
+
+    if ($matchingParent) {
+      parents.unshift($matchingParent);
+    }
+
+    $parent = $parent.parentNode;
+  }
+
+  return parents;
+};
+
+/**
+ * Initialize 'requireon' feature when part of the page was updated
+ */
+document.addEventListener('joomla:updated', ({
+  target,
+}) => {
+  // Check is it subform, then wee need to fix some "requireon" config
+  if (target.classList.contains('subform-repeatable-group')) {
+    const elements = [].slice.call(target.querySelectorAll('[data-requireon]'));
+
+    if (elements.length) {
+      const search = [];
+      const replace = []; // Collect all parent groups of changed group
+
+      getMatchedParents(target, '.subform-repeatable-group').forEach(($parent) => {
+        search.push(new RegExp(`\\[${$parent.dataset.baseName}X\\]`, 'g'));
+        replace.push(`[${$parent.dataset.group}]`);
+      }); // Fix requireon field names in a current group
+
+      elements.forEach((element) => {
+        let {
+          requireon,
+        } = element.dataset;
+        search.forEach((pattern, i) => {
+          requireon = requireon.replace(pattern, replace[i]);
+        });
+        element.dataset.requireon = requireon;
+      });
+    }
+  }
+
+  Joomla.Requireon.initialise(target);
+});
diff --git a/layouts/joomla/content/options_default.php b/layouts/joomla/content/options_default.php
index 9d0981f495d53..8f9bddfeef848 100644
--- a/layouts/joomla/content/options_default.php
+++ b/layouts/joomla/content/options_default.php
@@ -28,19 +28,23 @@
         <?php foreach ($fieldsnames as $fieldname) : ?>
             <?php foreach ($displayData->form->getFieldset($fieldname) as $field) : ?>
                 <?php $datashowon = ''; ?>
+                <?php $dataRequireOn = ''; ?>
                 <?php $groupClass = $field->type === 'Spacer' ? ' field-spacer' : ''; ?>
                 <?php if ($field->showon) : ?>
                     <?php $wa->useScript('showon'); ?>
-                    <?php $datashowon = ' data-showon=\'' . json_encode(FormHelper::parseShowOnConditions($field->showon, $field->formControl, $field->group)) . '\''; ?>
+                    <?php $datashowon = ' data-showon=\'' . json_encode(FormHelper::parseFieldConditions($field->showon, $field->formControl, $field->group)) . '\''; ?>
                 <?php endif; ?>
-
-                    <?php if (isset($displayData->showlabel)) : ?>
-                    <div class="control-group<?php echo $groupClass; ?>"<?php echo $datashowon; ?>>
+                <?php if ($field->requireon) : ?>
+                    <?php $wa->useScript('requireon'); ?>
+                    <?php $dataRequireOn = ' data-requireon=\'' . json_encode(FormHelper::parseFieldConditions($field->requireon, $field->formControl, $field->group)) . '\''; ?>
+                <?php endif; ?>
+                <?php if (isset($displayData->showlabel)) : ?>
+                    <div class="control-group<?php echo $groupClass; ?>"<?php echo $datashowon . $dataRequireOn; ?>>
                         <div class="controls"><?php echo $field->input; ?></div>
                     </div>
-                    <?php else : ?>
-                        <?php echo $field->renderField(); ?>
-                    <?php endif; ?>
+                <?php else : ?>
+                    <?php echo $field->renderField(); ?>
+                <?php endif; ?>
             <?php endforeach; ?>
         <?php endforeach; ?>
         </div>
diff --git a/layouts/joomla/form/renderfield.php b/layouts/joomla/form/renderfield.php
index 8bc343fdc027d..40a5e035bafa5 100644
--- a/layouts/joomla/form/renderfield.php
+++ b/layouts/joomla/form/renderfield.php
@@ -26,12 +26,17 @@
  * @var   string  $descClass    The class name to use for the description
  */
 
+/** @var Joomla\CMS\WebAsset\WebAssetManager $wa */
+$wa = Factory::getApplication()->getDocument()->getWebAssetManager();
+
 if (!empty($options['showonEnabled'])) {
-    /** @var Joomla\CMS\WebAsset\WebAssetManager $wa */
-    $wa = Factory::getApplication()->getDocument()->getWebAssetManager();
     $wa->useScript('showon');
 }
 
+if (!empty($options['requireonEnabled'])) {
+    $wa->useScript('requireon');
+}
+
 $class           = empty($options['class']) ? '' : ' ' . $options['class'];
 $rel             = empty($options['rel']) ? '' : ' ' . $options['rel'];
 $id              = ($id ?? $name) . '-desc';
diff --git a/layouts/joomla/searchtools/default/filters.php b/layouts/joomla/searchtools/default/filters.php
index 7cb174ed7f0b4..b297e98a9ca3e 100644
--- a/layouts/joomla/searchtools/default/filters.php
+++ b/layouts/joomla/searchtools/default/filters.php
@@ -26,11 +26,16 @@
     <?php foreach ($filters as $fieldName => $field) : ?>
         <?php if ($fieldName !== 'filter_search') : ?>
             <?php $dataShowOn = ''; ?>
+            <?php $dataRequireOn = ''; ?>
             <?php if ($field->showon) : ?>
                 <?php $wa->useScript('showon'); ?>
-                <?php $dataShowOn = " data-showon='" . json_encode(FormHelper::parseShowOnConditions($field->showon, $field->formControl, $field->group)) . "'"; ?>
+                <?php $dataShowOn = " data-showon='" . json_encode(FormHelper::parseFieldConditions($field->showon, $field->formControl, $field->group)) . "'"; ?>
             <?php endif; ?>
-            <div class="js-stools-field-filter"<?php echo $dataShowOn; ?>>
+            <?php if ($field->requireon) : ?>
+                <?php $wa->useScript('requireon'); ?>
+                <?php $dataRequireOn = " data-requireon='" . json_encode(FormHelper::parseFieldConditions($field->requireon, $field->formControl, $field->group)) . "'"; ?>
+            <?php endif; ?>
+            <div class="js-stools-field-filter"<?php echo $dataShowOn . $dataRequireOn; ?>>
                 <span class="visually-hidden"><?php echo $field->label; ?></span>
                 <?php echo $field->input; ?>
             </div>
diff --git a/libraries/src/Form/Field/ListField.php b/libraries/src/Form/Field/ListField.php
index c94bebafa50cd..b6351c8041800 100644
--- a/libraries/src/Form/Field/ListField.php
+++ b/libraries/src/Form/Field/ListField.php
@@ -127,13 +127,22 @@ protected function getOptions()
             // Set some event handler attributes. But really, should be using unobtrusive js.
             $tmp['onclick']  = (string) $option['onclick'];
             $tmp['onchange'] = (string) $option['onchange'];
+            $option['optionattr'] = "";
 
             if ((string) $option['showon']) {
                 $encodedConditions = json_encode(
-                    FormHelper::parseShowOnConditions((string) $option['showon'], $this->formControl, $this->group)
+                    FormHelper::parseFieldConditions((string) $option['showon'], $this->formControl, $this->group)
                 );
 
-                $tmp['optionattr'] = " data-showon='" . $encodedConditions . "'";
+                $tmp['optionattr'] .= " data-showon='" . $encodedConditions . "'";
+            }
+
+            if ((string) $option['requireon']) {
+                $encodedConditions = json_encode(
+                    FormHelper::parseFieldConditions((string) $option['requireon'], $this->formControl, $this->group)
+                );
+
+                $tmp['optionattr'] .= " data-requireon='" . $encodedConditions . "'";
             }
 
             // Add the option object to the result set.
diff --git a/libraries/src/Form/FormField.php b/libraries/src/Form/FormField.php
index 70d863b8ee186..15bb3220b4dcc 100644
--- a/libraries/src/Form/FormField.php
+++ b/libraries/src/Form/FormField.php
@@ -337,6 +337,14 @@ abstract class FormField implements DatabaseAwareInterface
      */
     protected $showon;
 
+    /**
+     * The conditions to make field required or optional.
+     *
+     * @var    string
+     * @since  4.2.0
+     */
+    protected $requireon;
+
     /**
      * The parent class of the field
      *
@@ -458,6 +466,7 @@ public function __get($name)
             case 'spellcheck':
             case 'validationtext':
             case 'showon':
+            case 'requireon':
             case 'parentclass':
                 return $this->$name;
 
@@ -505,8 +514,6 @@ public function __set($name, $value)
                 // Removes spaces from left & right and extra spaces from middle
                 $value = preg_replace('/\s+/', ' ', trim((string) $value));
 
-                // No break
-
             case 'description':
             case 'hint':
             case 'value':
@@ -519,6 +526,7 @@ public function __set($name, $value)
             case 'validationtext':
             case 'group':
             case 'showon':
+            case 'requireon':
             case 'parentclass':
             case 'default':
             case 'autocomplete':
@@ -543,8 +551,6 @@ public function __set($name, $value)
                 $value = (string) $value;
                 $value = $value === '' && isset($this->forceMultiple) ? (string) $this->forceMultiple : $value;
 
-                // No break
-
             case 'required':
             case 'disabled':
             case 'readonly':
@@ -640,7 +646,7 @@ public function setup(\SimpleXMLElement $element, $value, $group = null)
         $attributes = array(
             'multiple', 'name', 'id', 'hint', 'class', 'description', 'labelclass', 'onchange', 'onclick', 'validate', 'pattern', 'validationtext',
             'default', 'required', 'disabled', 'readonly', 'autofocus', 'hidden', 'autocomplete', 'spellcheck', 'translateHint', 'translateLabel',
-            'translate_label', 'translateDescription', 'translate_description', 'size', 'showon');
+            'translate_label', 'translateDescription', 'translate_description', 'size', 'showon', 'requireon');
 
         $this->default = isset($element['value']) ? (string) $element['value'] : $this->default;
 
@@ -1016,11 +1022,17 @@ public function renderField($options = array())
             : false;
 
         if ($this->showon) {
-            $options['rel']           = ' data-showon=\'' .
-                json_encode(FormHelper::parseShowOnConditions($this->showon, $this->formControl, $this->group)) . '\'';
+            $options['rel']          .= ' data-showon=\'' .
+                json_encode(FormHelper::parseFieldConditions($this->showon, $this->formControl, $this->group)) . '\'';
             $options['showonEnabled'] = true;
         }
 
+        if ($this->requireon) {
+            $options['rel']          .= ' data-requireon=\'' .
+                json_encode(FormHelper::parseFieldConditions($this->requireon, $this->formControl, $this->group)) . '\'';
+            $options['requireonEnabled'] = true;
+        }
+
         $data = array(
             'input'   => $this->getInput(),
             'label'   => $this->getLabel(),
@@ -1279,7 +1291,7 @@ protected function getLayoutData()
             'validationtext' => $this->validationtext,
             'readonly'       => $this->readonly,
             'repeat'         => $this->repeat,
-            'required'       => (bool) $this->required,
+            'required'       => (bool) $this->required || (bool) $this->requireon,
             'size'           => $this->size,
             'spellcheck'     => $this->spellcheck,
             'validate'       => $this->validate,
diff --git a/libraries/src/Form/FormHelper.php b/libraries/src/Form/FormHelper.php
index a42c6f580ac05..860bcef80c394 100644
--- a/libraries/src/Form/FormHelper.php
+++ b/libraries/src/Form/FormHelper.php
@@ -470,11 +470,29 @@ protected static function addPrefix($entity, $new = null)
      * @return  array   Array with show on conditions.
      *
      * @since   3.7.0
+     *
+     * @deprecated 5.0 Use \Joomla\CMS\Form\FormHelper::parseFieldConditions instead
      */
     public static function parseShowOnConditions($showOn, $formControl = null, $group = null)
     {
-        // Process the showon data.
-        if (!$showOn) {
+        return parseFieldConditions($showOn, $formControl, $group);
+    }
+
+    /**
+     * Parse the field conditions which is used for attributes such as `showon` and `requireon`
+     *
+     * @param   string  $conditions   Show/Require on conditions.
+     * @param   string  $formControl  Form name.
+     * @param   string  $group        The dot-separated form group path.
+     *
+     * @return  array   Array with show on conditions.
+     *
+     * @since   4.2.0
+     */
+    public static function parseFieldConditions($conditions, $formControl = null, $group = null)
+    {
+        // Process the conditions data.
+        if (!$conditions) {
             return array();
         }
 
@@ -495,40 +513,40 @@ public static function parseShowOnConditions($showOn, $formControl = null, $grou
             }
         }
 
-        $showOnData  = array();
-        $showOnParts = preg_split('#(\[AND\]|\[OR\])#', $showOn, -1, PREG_SPLIT_DELIM_CAPTURE);
+        $conditionData  = array();
+        $conditionParts = preg_split('#(\[AND\]|\[OR\])#', $conditions, -1, PREG_SPLIT_DELIM_CAPTURE);
         $op          = '';
 
-        foreach ($showOnParts as $showOnPart) {
-            if (($showOnPart === '[AND]') || $showOnPart === '[OR]') {
-                $op = trim($showOnPart, '[]');
+        foreach ($conditionParts as $conditionPart) {
+            if (($conditionPart === '[AND]') || $conditionPart === '[OR]') {
+                $op = trim($conditionPart, '[]');
                 continue;
             }
 
-            $compareEqual     = strpos($showOnPart, '!:') === false;
-            $showOnPartBlocks = explode(($compareEqual ? ':' : '!:'), $showOnPart, 2);
+            $compareEqual     = strpos($conditionPart, '!:') === false;
+            $conditionPartBlocks = explode(($compareEqual ? ':' : '!:'), $conditionPart, 2);
 
-            $dotPos = strpos($showOnPartBlocks[0], '.');
+            $dotPos = strpos($conditionPartBlocks[0], '.');
 
             if ($dotPos === false) {
-                $field = $formPath ? $formPath . '[' . $showOnPartBlocks[0] . ']' : $showOnPartBlocks[0];
+                $field = $formPath ? $formPath . '[' . $conditionPartBlocks[0] . ']' : $conditionPartBlocks[0];
             } else {
                 if ($dotPos === 0) {
-                    $fieldName = substr($showOnPartBlocks[0], 1);
+                    $fieldName = substr($conditionPartBlocks[0], 1);
                     $field     = $formControl ? $formControl . '[' . $fieldName . ']' : $fieldName;
                 } else {
                     if ($formControl) {
-                        $field = $formControl . ('[' . str_replace('.', '][', $showOnPartBlocks[0]) . ']');
+                        $field = $formControl . ('[' . str_replace('.', '][', $conditionPartBlocks[0]) . ']');
                     } else {
-                        $groupParts = explode('.', $showOnPartBlocks[0]);
+                        $groupParts = explode('.', $conditionPartBlocks[0]);
                         $field      = array_shift($groupParts) . '[' . join('][', $groupParts) . ']';
                     }
                 }
             }
 
-            $showOnData[] = array(
+            $conditionData[] = array(
                 'field'  => $field,
-                'values' => explode(',', $showOnPartBlocks[1]),
+                'values' => explode(',', $conditionPartBlocks[1]),
                 'sign'   => $compareEqual === true ? '=' : '!=',
                 'op'     => $op,
             );
@@ -538,6 +556,6 @@ public static function parseShowOnConditions($showOn, $formControl = null, $grou
             }
         }
 
-        return $showOnData;
+        return $conditionData;
     }
 }