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plugins/convertformstools/calculations/calculations.php

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+<?php
+
+/**
+ * @package         Convert Forms
+ * @version         3.2.12 Free
+ * 
+ * @author          Tassos Marinos <info@tassos.gr>
+ * @link            http://www.tassos.gr
+ * @copyright       Copyright © 2020 Tassos Marinos All Rights Reserved
+ * @license         GNU GPLv3 <http://www.gnu.org/licenses/gpl.html> or later
+*/
+
+defined('_JEXEC') or die('Restricted access');
+
+class PlgConvertFormsToolsCalculations extends JPlugin
+{
+    /**
+     *  Application Object
+     *
+     *  @var  object
+     */
+    protected $app;
+
+    /**
+     *  Auto loads the plugin language file
+     *
+     *  @var  boolean
+     */
+    protected $autoloadLanguage = true;
+
+    /**
+     *  We need to load our assets regardless if the form doesn't include a field that supports calculations because
+     *  user may add a field later. Thus we ensure the Calculation Builder is properly rendered.
+     *
+     *  @return  void
+     */
+    public function onConvertFormsBackendEditorDisplay()
+    {
+        JHtml::script('plg_convertformstools_calculations/calculation_builder.js', ['relative' => true, 'version' => 'auto']);
+    }
+
+    /**
+     *  Add plugin fields to the form
+     *
+     *  @param   JForm   $form  
+     *  @param   object  $data
+     *
+     *  @return  boolean
+     */
+    public function onConvertFormsBackendRenderOptionsForm($form, $field_type)
+    {
+        if (!in_array($field_type, ['text', 'number', 'hidden']))
+        {
+            return;
+        }
+
+        $form->loadFile(__DIR__ . '/form/form.xml');
+
+        if ($field_type == 'number')
+        {
+            // A number field does not accept text in its value. Remove unsupported options.
+            $form->removeField('prefix', 'calculations');
+            $form->removeField('suffix', 'calculations');
+            $form->removeField('thousand_separator', 'calculations');
+        }
+    }
+
+    
+}