Adding error feedbacks when adding a payment

1 files changed, 21 insertions, 0 deletions

diff --git a/src/client/Utils/Validation.elm b/src/client/Utils/Validation.elm
new file mode 100644
index 0000000..0c1773e
--- /dev/null
+++ b/src/client/Utils/Validation.elm
@@ -0,0 +1,21 @@
+module Utils.Validation
+  ( validateNonEmpty
+  , validateNumber
+  ) where
+
+import String
+import Reads exposing (readInt)
+
+validateNonEmpty : String -> String -> Result String String
+validateNonEmpty message str =
+  if String.isEmpty str
+   then Err message
+   else Ok str
+
+validateNumber : String -> String -> Result String Int
+validateNumber message str =
+  case readInt str of
+    Just number ->
+      Ok number
+    Nothing ->
+      Err message