From cbf8050f2a533819c49fd0fc213e9416072c9100 Mon Sep 17 00:00:00 2001
From: Loz Calver <lozcalver@bigfork.co.uk>
Date: Mon, 27 Mar 2017 14:33:37 +0100
Subject: [PATCH] Allow use of setHasEmptyDefault() in StringTagField

---
 code/StringTagField.php | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/code/StringTagField.php b/code/StringTagField.php
index 83a0292..159f268 100644
--- a/code/StringTagField.php
+++ b/code/StringTagField.php
@@ -161,6 +161,11 @@ class StringTagField extends DropdownField
             $this->setAttribute('multiple', 'multiple');
         }
 
+        if ($this->getHasEmptyDefault()) {
+            $this->setAttribute('data-allow-clear', true);
+            $this->setAttribute('data-placeholder', $this->getEmptyString() ?: ' ');
+        }
+
         if ($this->getShouldLazyLoad()) {
             $this->setAttribute('data-ss-tag-field-suggest-url', $this->getSuggestURL());
         } else {
@@ -199,6 +204,14 @@ class StringTagField extends DropdownField
 
         $values = $this->Value();
 
+        if ($this->getHasEmptyDefault()) {
+            $options->push(ArrayData::create(array(
+                'Value' => '',
+                'Title' => '',
+                'Selected' => empty($values)
+            )));
+        }
+
         foreach ($source as $value) {
             $options->push(
                 ArrayData::create(array(