In WebAssembly pre-render false, is there a way to display a loading message while downloading the wasm files?

[ricfwolff]

I'm creating a page that runs only on WebAssembly and I need to have pre-rendering disabled (by using RenderModeInteractiveWebAssembly(prerender: false)).

Is there a way to display the loading spinner (as we had on .net 7) or at least a "loading..." when the user navigates to this page? (while it's downloading the web assemblies)

[javiercn]

@ricfwolff thanks for contacting us.

We don't have the equivalent functionality in Blazor web, what you can do in this case is:

• Prerender a wrapper component that displays the placeholder on the page.
  • Inside the wrapper, render your component with prerender: false
• Have the wrapper use @if(OsPlatform.IsBrowser()) to distinguish between SSR and WebAssembly and render your placeholder or the actual component.

[ricfwolff]

hmm, that makes sense.
I'm working on enabling pre-render on my project. But that might be a good workaround.
Thank you!

[achmstein]

When I try to enable prerender, I'm getting 'A second operation started in this context' exception when using CustomUserClaimsPrincipalFactory? Is there any workaround or I need to disable prerending?

[SteveSandersonMS]

@achmstein That sounds unrelated to this issue. Could you file a new issue with full, minimal repro steps?

[achmstein]

@SteveSandersonMS I found why this is happening and it's related to this issue #43687

[MackinnonBuck]

Dupe of #49056