serial no display in output.

app/Laratables/CustomUser.php

@@ -100,4 +100,29 @@ public static function laratablesCustomAction($user)
     {
         return view('navtab.output.customize.action', compact('user'))->render();
     }
+
+    /**
+    * Sets the serial number column value for each user.
+    *
+    * @param \Illuminate\Support\Collection
+    * @return \Illuminate\Support\Collection
+    **/
+    public static function laratablesModifyCollection($users)
+    {
+        return $users->map(function ($user, $key) {
+            $user->serial_no = $key + 1 + request()->input('start');
+            return $user;
+        });
+    }
+
+    /**
+     * Returns the custom column serial number value for table.
+     *
+     * @param \App\User $user
+     * @return string
+     **/
+    public static function laratablesCustomSerialNo($user)
+    {
+        return $user->serial_no;
+    }
 }

resources/views/navtab/output/customize/laratable.blade.php

@@ -18,7 +18,7 @@
                 ajax: "{{ route('custom_laratable') }}",
                 order: [[1, "asc"]],
                 columns: [
-                     { name: 'serial_no', orderable: false, searchable: false},
+                    { name: 'serial_no', orderable: false, searchable: false},
                     { name: 'Name' },
                     { name: 'start_date' },
                     { name: 'salary' },