[Bug?] How to call into JSInterop from SetParameters?

[chanan]

Now that calling JS is async it is problematic that SetParameters is still sync. In my case, I need to call a JS method inside of SetParameters before the call to _renderHandle.Render(Render);. Would it be possible to make _renderHandle.Render(Render); async as well?

[chanan]

In fact, I have been able to call the async code properly at all. Here is what I tried:

var updates = Task.Run(async () => await UpdateCss(css, debug, _classname, _attributesToRender)).Result;
if (updates != null) _classname = updates;
_renderHandle.Render(Render);

or as:

var updates = Task.Run(() => UpdateCss(css, debug, _classname, _attributesToRender)).Result;

in both case the Blazor app fails to load with no errors

another attempt was:

Task.Run(async () => {
   var updates = await UpdateCss(css, debug, _classname, _attributesToRender);
   if (updates != null) _classname = updates;
   _renderHandle.Render(Render);
});

Or

Task.Run(async () => {
   var updates = await UpdateCss(css, debug, _classname, _attributesToRender);
   if (updates != null) _classname = updates;
});
 _renderHandle.Render(Render);

Both these dont work either, but at least the app loads.

Is there a way to call JS from within SetParameters?

[chanan]

@SteveSandersonMS Sorry to bother you, but I think this is problematic, or am I missing something?

[Andrzej-W]

Maybe this will help https://github.com/aspnet/Blazor/issues/1240#issuecomment-410725576

[danroth27]

I need to call a JS method inside of SetParameters before the call to _renderHandle.Render(Render);.

@chanan I think making the JS call from OnParametersSetAsync should do what you want.