select_menu: Initial investigation to fix navigating back issue #3.

select_menu/backend.go

@@ -61,6 +61,10 @@ func New(options []string, defaultOption string, query url.Values, queryParamete
 		// HACK: Don't use Sprintf, properly encode (as json at this time).
 		Val: fmt.Sprintf(`SelectMenuOnInput(event, this, %q, %q);`, strconv.Quote(defaultOption), strconv.Quote(queryParameter)),
 	})
+	selectElement.Attr = append(selectElement.Attr, html.Attribute{
+		Key: "onload",
+		Val: `alert('loaded');`,
+	})
 
 	html, err := html_gen.RenderNodes(selectElement)
 	if err != nil {

select_menu/frontend.go

@@ -31,5 +31,15 @@ func SelectMenuOnInput(event dom.Event, object dom.HTMLElement, defaultOption, q
 		query.Set(queryParameter, selected)
 	}
 
+	var originalSelected int
+	options := selectElement.Underlying().Get("options")
+	for i := 0; i < options.Length(); i++ {
+		if options.Index(i).Get("defaultSelected").Bool() {
+			originalSelected = i
+			break
+		}
+	}
+	selectElement.Underlying().Set("selectedIndex", originalSelected)
+
 	dom.GetWindow().Location().Search = "?" + query.Encode()
 }