1 files changed, 62 insertions, 0 deletions
diff --git a/src/View/Form/Autocomplete.ml b/src/View/Form/Autocomplete.ml
new file mode 100644
index 0000000..537316d
--- /dev/null
+++ b/src/View/Form/Autocomplete.ml
@@ -0,0 +1,62 @@
+let search s xs =
+  if s == "" then
+    [| |]
+  else
+    let results = Js.Array.filter (Js.String.includes s) xs in
+    if Js.Array.length results == 1 && results.(0) == s then [| |] else results
+
+let render_completion on_select entries =
+  H.div
+    [| HA.class_ "g-Autocomplete__Completion" |]
+    (entries
+      |> Js.Array.map (fun c ->
+          H.button
+            [| HA.class_ "g-Autocomplete__Entry"
+            ;  HA.type_ "button"
+            ;  HE.on_click (fun _ -> on_select c)
+            |]
+            [| H.text c |]))
+
+let create id label values on_input attrs =
+
+  let completion =
+    H.div [| |] [| |]
+  in
+
+  let update_completion target value =
+    let entries = search value values in
+    Element.mount_on completion (render_completion
+      (fun selected ->
+        let () = Element.set_value target selected in
+        let () = Element.remove_children completion in
+        on_input selected)
+      entries)
+  in
+
+  H.div
+    [| HA.class_ "g-Autocomplete" |]
+    [| H.div
+        [| HA.class_ "g-Form__Label" |]
+        [| H.label
+          [| HA.for_ id |]
+          [| H.text label |]
+        |]
+    ; H.input
+      (Js.Array.concat
+        [| HA.id id
+        ; HA.class_ "g-Autocomplete__Input"
+        ; HA.autocomplete "off"
+        ;  HE.on_click (fun e ->
+            let target = Event.target e in
+            let value = Element.value target in
+            update_completion target value)
+        ;  HE.on_input (fun e ->
+            let target = Event.target e in
+            let value = Element.value target in
+            let () = update_completion target value in
+            on_input value)
+        |]
+        attrs)
+      [| |]
+    ;  completion
+    |]