1 files changed, 49 insertions, 0 deletions
diff --git a/go/ui/textInput_wasm.go b/go/ui/textInput_wasm.go
new file mode 100644
index 00000000..0ced3ac4
--- /dev/null
+++ b/go/ui/textInput_wasm.go
@@ -0,0 +1,49 @@
+package ui
+
+import (
+	"log"
+	"syscall/js"
+	"unicode/utf8"
+)
+
+// rmueller's version from:
+// ://stackoverflow.com/questions/1752414/how-to-reverse-a-string-in-go?page=1&tab=scoredesc#tab-top
+func reverseString(s string) string {
+	size := len(s)
+	buf := make([]byte, size)
+	for start := 0; start < size; {
+		r, n := utf8.DecodeRuneInString(s[start:])
+		start += n
+		utf8.EncodeRune(buf[size-start:], r)
+	}
+	return string(buf)
+}
+
+func (ti *TextInput) Focus(focus bool) {
+	ti.focused = focus
+	log.Printf("%v set focus: %v\n", ti, focus)
+	if focus {
+		d := js.Global().Get("document")
+		i := d.Call("getElementById", "hiddenInput")
+		// i.Call("focus", map[string]any{"preventScroll": true, "focusVisible": false})
+		i.Call("focus")
+		log.Println("open keyboard")
+
+		log.Printf("set hidden input value to %s", ti.Text())
+		// i.Set("value", ti.Text())
+		i.Set("value", reverseString(ti.Text()))
+	}
+}
+
+func (ti *TextInput) Update() error {
+	if ti.focused {
+		d := js.Global().Get("document")
+		i := d.Call("getElementById", "hiddenInput")
+		// t := i.Get("value").String()
+		t := reverseString(i.Get("value").String())
+		ti.SetInput(t)
+	}
+	return nil
+}
+
+func (*TextInput) IsUpdatable() bool { return true }