From 25607bc3fb8fd97bac2bfcbc8c96316a50b3feff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matus=20M=C3=A1rk?= <matus.mark@groware.hu>
Date: Fri, 7 Sep 2018 17:45:07 +0200
Subject: [PATCH] Update FormElement.php

There is many JS libraries using input group and add on attributes. I extended your code, so that it can be rendered.
---
 .../Form/View/Helper/FormElement.php          | 40 +++++++++++++++++--
 1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/src/TwbsHelper/Form/View/Helper/FormElement.php b/src/TwbsHelper/Form/View/Helper/FormElement.php
index ae96b75c1..62e2fd672 100644
--- a/src/TwbsHelper/Form/View/Helper/FormElement.php
+++ b/src/TwbsHelper/Form/View/Helper/FormElement.php
@@ -24,10 +24,10 @@
 class FormElement extends ZendFormElementViewHelper implements TranslatorAwareInterface
 {
     // @var string
-    protected static $addonFormat = '<%s class="%s"><span class="input-group-text">%s</span></%s>';
+    protected static $addonFormat = '<%s class="%s" %s><span class="input-group-text">%s</span></%s>';
 
     // @var string
-    protected static $inputGroupFormat = '<div class="input-group %s">%s</div>';
+    protected static $inputGroupFormat = '<div class="input-group %s" %s>%s</div>';
 
     // Translator (optional)
     // @var Translator
@@ -114,7 +114,7 @@ public function render(ElementInterface $oElement)
 
         // Addon append
         if ($aAddOnAppend = $oElement->getOption('add-on-append')) {
-            $sMarkup .= $this->renderAddOn($aAddOnAppend);
+            $sMarkup .= $this->renderAddOn($aAddOnAppend, 'append');
         }
 
         if ($aAddOnAppend || $aAddOnPrepend) {
@@ -128,11 +128,34 @@ public function render(ElementInterface $oElement)
                     $sSpecialClass .= ' input-group-sm';
                 }
             }
+            
+            
+            $sSpecialAttributes = '';
+
+            // Input group attributes
+	        if (is_array($oElement->getOption('input-group'))){
+		        $aInputGroup = $oElement->getOption('input-group');
+
+		        // Input group class
+		        if(! empty($aInputGroup['class'])){
+					$sSpecialClass .= ' ' . $aInputGroup['class'];
+				}
+
+				// Input group other attributes
+				if(is_array($aInputGroup['attributes'])){
+					foreach ($aInputGroup['attributes'] as $name => $value){
+						$sSpecialAttributes .= $name . '="' . $value . '" ';
+					}
+					$sSpecialAttributes = trim($sSpecialAttributes);
+				}
+
+	        }
 
             // Add a sprintf directive for correct render of errors
             return $sMarkup = sprintf(
                 static::$inputGroupFormat,
                 trim($sSpecialClass),
+                $sSpecialAttributes,
                 $sMarkup . "%s"
             );
         }
@@ -222,8 +245,17 @@ protected function renderAddOn($aAddOnOptions, string $sPosition = 'prepend')
                 $sAddonClass .= ' input-group-addon';
             }
         }
+        
+        $sAttributes = '';
+
+		if(! empty($aAddOnOptions['attributes'])){
+			foreach($aAddOnOptions['attributes'] as $name => $value){
+				$sAttributes .= $name .'="' . $value . '" ';
+			}
+			$sAttributes = rtrim($sAttributes);
+		}
 
-        return sprintf(static::$addonFormat, $sAddonTagName, trim($sAddonClass), $sMarkup, $sAddonTagName);
+        return sprintf(static::$addonFormat, $sAddonTagName, trim($sAddonClass), $sAttributes, $sMarkup, $sAddonTagName);
     }