webassemblyvisual-studio-2022uno-platform

Uno Platform WASM URL routing

I'm trying to write a simple blog engine in Uno WASM. I'd need to retrive the URL string to process it and route the request to a page or a method, but cannot find any documentation on this topic. I'm using the last Uno template in Visual Studio 2022

Solution

  • It is possible to use LaunchActivatedEventArgs.Arguments property to retrieve the query string arguments in OnLaunched method of App.xaml.cs:

    protected override void OnLaunched(LaunchActivatedEventArgs e)
{
   ...
   var arguments = e.Arguments;
   // Parse arguments and navigate somewhere based on them
}

    Full route-based navigation you must first enable it by specifying the root route of your app (see docs). Essentially you need to add the base path to your WebAssembly .csproj:

    <PropertyGroup>
  <WasmShellWebAppBasePath>/</WasmShellWebAppBasePath>
</PropertyGroup>

    Then you can get the actual URL on WASM using:

    #if __WASM__
var href = Foundation.WebAssemblyRuntime.InvokeJS("window.location.href");
// Parse the URL and navigate somewhere
#endif

    The other way around - when you want to set the current URL, you can use window.history.pushState:

    Foundation.WebAssemblyRuntime.InvokeJS(
   "window.history.pushState(\"" + someUrl + "\",\"" + pageTitle + "\"");

    This can be done more easily using Uno.Extensions, which includes support for routing, documentation for this will be coming soon.