From 2724d931112407facece00503cb175934c892007 Mon Sep 17 00:00:00 2001
From: shoosah <sshahbazi.nz@gmail.com>
Date: Fri, 22 Nov 2019 11:03:27 +1300
Subject: [PATCH] Allow to add error message into a specific field

---
 src/Forms/Form.php | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/Forms/Form.php b/src/Forms/Form.php
index 38a9136d2..a88ed5728 100644
--- a/src/Forms/Form.php
+++ b/src/Forms/Form.php
@@ -1270,6 +1270,23 @@ class Form extends ViewableData implements HasRequestHandler
         $this->setSessionValidationResult($result);
     }
 
+    /**
+     * Set an error message for a field in the session, for display next time this form is shown.
+     *
+     * @param string $message the text of the message
+     * @param string $fieldName Name of the field to set the error message on it.
+     * @param string $type Should be set to good, bad, or warning.
+     * @param string|bool $cast Cast type; One of the CAST_ constant definitions.
+     * Bool values will be treated as plain text flag.
+     */
+    public function sessionFieldError($message, $fieldName, $type = ValidationResult::TYPE_ERROR, $cast = ValidationResult::CAST_TEXT)
+    {
+        $this->setMessage($message, $type, $cast);
+        $result = $this->getSessionValidationResult() ?: ValidationResult::create();
+        $result->addFieldMessage($fieldName, $message, $type, null, $cast);
+        $this->setSessionValidationResult($result);
+    }
+
     /**
      * Returns the DataObject that has given this form its data
      * through {@link loadDataFrom()}.