Ability to change route from the server.

examples/python/app.py

@@ -21,7 +21,7 @@ def page(title, content):
 # Both sample pages.
 root_page = page("Home page", "Welcome on sample routing page!")
 other_page = page("Some other page", "Lorem ipsum dolor sit amet.")
-third_page = tags.div(menu, tags.h3("Third Page"))
+third_page = tags.div(menu, tags.h3("Third Page"), ui.input_action_button(id = "click", label = "Click me"))
 
 # Make output for our router in main UI of Shiny app.
 app_ui = ui.page_fluid(
@@ -46,5 +46,11 @@ def param():
       ui.p("No id" if not id else str(id)),
     )
 
+  @reactive.effect
+  async def redirect():
+    input.click()
+    print("Elo")
+    await session.send_custom_message("_shiny_router_change_url", {"url": "elo"})
+
 
 app = App(app_ui, server)

inst/www/shiny.router.css

@@ -9,3 +9,7 @@
 .router-hidden * {
   visibility: inherit;
 }
+
+div.router-hidden:where(.shiny-html-output):has(>*) {
+  display: inherit;
+}

inst/www/shiny.router.js

@@ -41,7 +41,7 @@ window.shinyrouter = function() {
     };
 }();
 
-var switchUI = function(message) {
+const switchUI = function(message) {
   // In Shiny for R message can be string and path is send as string.
   // In Shiny for Python meesage has to be an object. Path is send as field.
   const path = typeof message === "string" ? message : message?.path; 
@@ -56,6 +56,14 @@ var switchUI = function(message) {
 
 Shiny.addCustomMessageHandler("switch-ui", switchUI);
 
+const change_url = function(message) {
+  // In Shiny for Python meesage has to be an object. Path is send as field.
+  const url = message.url; 
+  window.location.hash = url;
+}
+
+Shiny.addCustomMessageHandler("_shiny_router_change_url", change_url);
+
 $(window).on("hashchange", function (e) {
   Shiny.setInputValue("_clientdata_url_hash", window.location.hash);
   return;

pyproject.toml

@@ -1,13 +1,14 @@
 [project]
 name = "shiny_router"
-version = "0.1.5"
+version = "0.1.12"
 description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
     "pandas",
     "shiny",
     "shiny-router",
+    "pytest",
 ]
 
 [tool.setuptools]

src/shiny_router/router.py

@@ -53,9 +53,12 @@ def router_callback(input, output, session=None, **kwargs):
         @reactive.event(input._clientdata_url_hash)
         def _():
             requested_path = input._clientdata_url_hash()
+            log_msg("requested path" + requested_path)
             parsed_url = urlparse(requested_path)
             fragment_path = urlparse(parsed_url.fragment)
             clean_path = fragment_path.path.lstrip("!").lstrip("/")
+            if clean_path == "":
+                clean_path = root
             query_params = parse_qs(fragment_path.query)
 
             print("Path:", clean_path)
@@ -112,14 +115,6 @@ def route(path, ui, server=None):
         print("Warning: 'server' argument in 'route' is deprecated.")
     return {"path": path, "logic": callback_mapping(path, ui, server)}
 
-def router_ui(default, *args, page_404=None):
-    routes = {**default, **{arg: callback_mapping(arg, ui) for arg, ui in args}}
-    root = list(default.keys())[0]
-    if '404' not in routes:
-        routes['404'] = route('404', page_404)
-    return {'root': root, 'routes': routes}
-
-
 def router_ui_internal(router):
     # Define paths to JavaScript and CSS files
     js_file = "shiny.router.js"

tests/python/test_router.py

@@ -0,0 +1,6 @@
+from shiny_router import route_link
+
+def test_route_link():
+    assert route_link("/") == "./#!/"
+    assert route_link("abc") == "./#!/abc"
+    assert route_link("#/xyzq") == "./#!/xyzq"