no dispatchGlobalEventToAllElements when no renderer attached

[zuizuihao]

ROOT CAUSE

when Blazor connection closed, the detachWebRendererInterop in the callback of connection.onclose will be invoked. here, it will invoke interopMethodsByRenderer.delete(rendererId);, all the interopMethodsByRenderer will be cleaned. also There are lots of global event listener in form.js like window.addEventListener('focus'), window.addEventListener('keydown'). if user still interact with our app like focus, click, the global event will be triggered, then invoked EventDelegator.onGlobalEvent, invoked EventDelegator.dispatchGlobalEventToAllElements invoked WebRendererInteropMethods.dispatchEvent invoked WebRendererInteropMethods.getInteropMethods, here since the interopMethodsByRenderer is empty, will throw this exception.

SOLUTION:

check isRendererAttached before dispatchGlobalEventToAllElements in EventDelegator

Fixes #57828

Before Fixes:

After Fixes:

[zuizuihao]

/azp run

[azure-pipelines]

Commenter does not have sufficient privileges for PR 58667 in repo dotnet/aspnetcore

[zuizuihao]

any progress on it @javiercn

[tomvandyckVdP]

I've got the impression quite some people are experiencing this issue ... any updates on the solution please?

[jscott1277]

Would love to see this fix get merged in as well. Thanks!

[tomvandyckVdP]

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