Fixed issue #17386: Missing curly brackets for expression input field(#…

…1944)

application/extensions/AdvancedSettingWidget/AdvancedSettingWidget.php

@@ -19,6 +19,15 @@ public function run()
         //if ($this->setting['inputtype'] === 'singleselect') {
             //echo '<pre>'; var_dump($this->setting['aFormElementOptions']['options']); echo '</pre>';
         //}
+
+        // The 'expression' property comes from the question attribute definition (either from the theme's config.xml
+        // or from newQuestionAttributes() plugin event).
+        // The value 2 indicates that the attribute must be treated as an EM expression (survey logic file and question
+        // summary automatically add the brackets before evaluation).
+        if (isset($this->setting['expression']) && $this->setting['expression'] == 2) {
+            $this->setting['aFormElementOptions']['inputGroup'] = ['prefix' => '{', 'suffix' => '}'];
+        }
+
         $content = $this->render($this->setting['inputtype'], null, true);
         $this->render('layout', ['content' => $content]);
     }