Added key detection

lib/odin/js_input/input.odin

@@ -0,0 +1,36 @@
+package js_input
+
+import "core:sys/wasm/js"
+import "core:log"
+
+DEFAULT_INPUT_EVENT_CALLBACKS :: Input_Event_Callbacks{
+    key_down = register_key_down_callback,
+    key_up   = register_key_up_callback,
+}
+
+Input_State :: struct {
+    // store keys
+}
+
+Input_Event_Callbacks :: struct {
+    key_down: proc(e: js.Event),
+    key_up: proc(e: js.Event),
+}
+
+init_input :: proc(input: ^Input_State, callbacks := DEFAULT_INPUT_EVENT_CALLBACKS) {
+    js.add_document_event_listener(js.Event_Kind.Key_Down, input, callbacks.key_down)
+    js.add_document_event_listener(js.Event_Kind.Key_Up, input, callbacks.key_up)
+}
+
+register_key_down_callback :: proc(event: js.Event) {
+    log.infof("Key down: %s", event.key.key)
+}
+
+register_key_up_callback :: proc(event: js.Event) {
+    d := get_user_data_as(Input_State, event)
+    log.infof("Key up: %s", event.key.key)
+}
+
+get_user_data_as :: proc($T: typeid, e: js.Event) -> ^T {
+    return cast(^T)e.user_data
+}