diff --git a/src/Tpl.php b/src/Tpl.php
index 9a90fba..02ed8af 100644
--- a/src/Tpl.php
+++ b/src/Tpl.php
@@ -535,11 +535,17 @@ class Tpl {
    * Display AJAX return
    * @param array|null $data AJAX returned data (optional)
    * @param int|null $error_code HTTP error code (optional, default: 400 if not $data['success'])
-   * @param bool $pretty AJAX returned data
+   * @param bool|null $pretty AJAX returned data
    *             (optional, default: true if $_REQUEST['pretty'] is set, False otherwise)
+   * @param bool $keep_messages_on_success If true and the return is a success, errors & messages
+   *                                       will be keep in session and will not be included in this
+   *                                       Ajax return (useful if you want to trigger redirect on
+   *                                       success)
    * @return never
    */
-  public static function display_ajax_return($data=null, $error_code=null, $pretty=false) {
+  public static function display_ajax_return(
+    $data=null, $error_code=null, $pretty=null, $keep_messages_on_success=false
+  ) {
     if (!is_array($data))
       $data = array();
 
@@ -550,18 +556,25 @@ class Tpl {
     )
       http_response_code($error_code ? $error_code : 400);
 
-    $data['messages'] = self :: get_messages();
-    if (!$data['messages']) unset($data['messages']);
-    self :: purge_messages();
+    if (($data['success'] ?? false) && !$keep_messages_on_success) {
+      $data['messages'] = self :: get_messages();
+      if (!$data['messages']) unset($data['messages']);
+      self :: purge_messages();
 
-    $data['errors'] = self :: get_errors();
-    if (!$data['errors']) unset($data['errors']);
-    self :: purge_errors();
+      $data['errors'] = self :: get_errors();
+      if (!$data['errors']) unset($data['errors']);
+      self :: purge_errors();
+    }
 
     if (self :: $_debug_ajax)
       Log :: debug("AJAX Response : ".vardump($data));
     header('Content-Type: application/json');
-    echo json_encode($data, (($pretty||isset($_REQUEST['pretty']))?JSON_PRETTY_PRINT:0));
+    echo json_encode(
+      $data,
+      ($pretty ?? false) || isset($_REQUEST['pretty'])?
+      JSON_PRETTY_PRINT:
+      0
+    );
     exit();
   }