API Reference¶

The routing library provides the following functions, classes, and attributes. All attributes can be accessed from the routing.router module.

Functions¶

navigate(*, path=None, params=None, query=None, hash=None, replace=False, nav_context=None, form_properties=None)
navigate(path, **kws)
navigate(url, **kws)
navigate(routing_context, **kws): Navigates to a new page.
launch(): Launches the routing library and navigates to the first route. Call this in your startup module.
go(n=0): Navigates to the nth page in the history stack.
back(): Navigates back in the history stack.
forward(): Navigates forward in the history stack.
reload(hard=False): Reloads the current page. If hard is True, the page will be reloaded from the server. If hard is False, the page will be removed from the cache and reloaded on the client.
add_event_handler(event_name, handler): Adds an event handler for the given event name. The event handler should take a **event_args argument. The event_name can be one of the following:

"navigate": raised when the url changes.
"pending": raised when the navigation starts.
"idle": raised when the navigation is complete.

remove_event_handler(event_name, handler): Removes an event handler for the given event name.
get_routing_context(): Returns the current routing context.
use_data(context_or_path_or_url=None, *, path=None, params=None, query=None, hash=None): Loads and returns the data for the specified url/context (or for the specified path/params/query/hash). Returns the data (or raises if there is an error). If called with no arguments, uses the current navigation context.

Can be useful for routes that share data. Or layouts that need access to the data for the current route.

get_url()
get_url(*, path=None, params=None, query=None, hash=None, full=False)
get_url(path, **kws)
get_url(routing_context, **kws): Gets the URL. If no keyword arguments are passed, the current URL will be returned. If full is True, the full URL will be returned (e.g., http://my-app.anvil.app/articles/123?foo=bar#hash). If full is False, the URL will be relative to the base URL (e.g., /articles/123?foo=bar#hash).
debug_logging(enable=True): Enables or disables debug logging.
clear_cache(): Clears the cache of forms and data.
invalidate(*, path=None, deps=None, exact=False): Invalidates any cached data and forms based on the path and deps. The exact argument determines whether to invalidate based on an exact match or a partial match.
open_form(form, **form_properties): When migrating, you may be able to replace anvil.open_form with router.open_form. This will only work if you are not using params.
alert(content, *args, dismissible=True, **kwargs): Shows an alert. If dismissible is True, the alert will be dismissed when the user navigates to a new page. To override Anvil's default alert, you can set the anvil.alert = router.alert.
confirm(content, *args, dismissible=True, **kwargs): Shows a confirmation dialog. If dismissible is True, the dialog will be dismissed when the user navigates to a new page. To override Anvil's default alert, you can set the anvil.alert = router.alert.
hooks.before_load(func): Decorator to register a method as a before_load hook for a Route. Hooks are called in the order they are defined on the class. Each hook receives a nav_context keyword argument (the context dict accumulated so far), which can be read and updated for composable navigation logic.

from routing.router import Route, hooks, Redirect

class AuthenticatedRoute(Route):
    # Style 1: Mutate nav_context directly
    @hooks.before_load
    def set_user(self, nav_context, **loader_args):
        nav_context["user"] = get_current_user()

    # Style 2: Return a partial dict to be merged into nav_context
    @hooks.before_load
    def set_user_partial(self, nav_context, **loader_args):
        return {"user": get_current_user()}

    @hooks.before_load
    def check_permissions(self, nav_context, **loader_args):
        user = nav_context.get("user")
        if not user or not user.has_permission():
            raise Redirect(path="/login")

# Both styles are supported; the returned dictionary (if any) will be merged into nav_context after the hook runs.

You may also attach hooks globally to all routes by assigning to the base class:

@hooks.before_load
def global_hook(self, nav_context, **loader_args):
    nav_context["feature_enabled"] = True
Route.global_hook = global_hook

See the navigation documentation for advanced composition and usage patterns.

Classes¶

Route: The base class for all routes.
RoutingContext: Provides information about the current route and navigation context. Passed to all forms instantiated by the routing library.

Components¶

NavLink.NavLink: A link that you will likely use in your main layout's sidebar. Has an active property that is set when the NavLink's navigation properties match the current routing context.
Anchor.Anchor: A link that you can use inline or as a container for other components.

Context Managers¶

NavigationBlocker: A context manager that will prevent the user from navigating away during the context.

Exceptions¶

Redirect: Raise during a route's before_load method to redirect to a different route.
NotFound: Raised when a route is not found for a given path.