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Sporadic JSException during the start #992

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opened 2026-01-29 17:47:26 +00:00 by claunia · 3 comments
claunia commented 2026-01-29 17:47:26 +00:00
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Originally created by @OndrejUzovic on GitHub (Sep 20, 2023).

It seems there is a race condition issue causing an exception when the application starts.
If the exception occurs and I just refresh the web-page then everything is initialized correctly and the application works fine.

In my Blazor Server application I sporadically get the following exception:

[2023-09-20T11:46:22.745Z] Error: Microsoft.JSInterop.JSException: Could not find 'Radzen.mediaQuery' ('Radzen' was undefined).
Error: Could not find 'Radzen.mediaQuery' ('Radzen' was undefined).
    at https://localhost:44395/_framework/blazor.server.js:1:497
    at Array.forEach (<anonymous>)
    at s.findFunction (https://localhost:44395/_framework/blazor.server.js:1:465)
    at E (https://localhost:44395/_framework/blazor.server.js:1:2611)
    at https://localhost:44395/_framework/blazor.server.js:1:3499
    at new Promise (<anonymous>)
    at Ft.beginInvokeJSFromDotNet (https://localhost:44395/_framework/blazor.server.js:1:3480)
    at Ft._invokeClientMethod (https://localhost:44395/_framework/blazor.server.js:1:75072)
    at Ft._processIncomingData (https://localhost:44395/_framework/blazor.server.js:1:72696)
    at Ft.connection.onreceive (https://localhost:44395/_framework/blazor.server.js:1:67009)
   at Microsoft.JSInterop.JSRuntime.InvokeAsync[TValue](Int64 targetInstanceId, String identifier, Object[] args)
   at Radzen.Blazor.RadzenMediaQuery.OnAfterRenderAsync(Boolean firstRender)
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle, ComponentState owningComponentState)

Any idea why does it happen or haw can I avoid it?

Originally created by @OndrejUzovic on GitHub (Sep 20, 2023). It seems there is a race condition issue causing an exception when the application starts. If the exception occurs and I just refresh the web-page then everything is initialized correctly and the application works fine. In my Blazor Server application I sporadically get the following exception: ``` [2023-09-20T11:46:22.745Z] Error: Microsoft.JSInterop.JSException: Could not find 'Radzen.mediaQuery' ('Radzen' was undefined). Error: Could not find 'Radzen.mediaQuery' ('Radzen' was undefined). at https://localhost:44395/_framework/blazor.server.js:1:497 at Array.forEach (<anonymous>) at s.findFunction (https://localhost:44395/_framework/blazor.server.js:1:465) at E (https://localhost:44395/_framework/blazor.server.js:1:2611) at https://localhost:44395/_framework/blazor.server.js:1:3499 at new Promise (<anonymous>) at Ft.beginInvokeJSFromDotNet (https://localhost:44395/_framework/blazor.server.js:1:3480) at Ft._invokeClientMethod (https://localhost:44395/_framework/blazor.server.js:1:75072) at Ft._processIncomingData (https://localhost:44395/_framework/blazor.server.js:1:72696) at Ft.connection.onreceive (https://localhost:44395/_framework/blazor.server.js:1:67009) at Microsoft.JSInterop.JSRuntime.InvokeAsync[TValue](Int64 targetInstanceId, String identifier, Object[] args) at Radzen.Blazor.RadzenMediaQuery.OnAfterRenderAsync(Boolean firstRender) at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle, ComponentState owningComponentState) ``` Any idea why does it happen or haw can I avoid it?
claunia commented 2026-01-29 17:47:27 +00:00
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@akorchev commented on GitHub (Sep 20, 2023):

This error happens if the Radzen.Blazor JS file fails to load for some reason (Radzen is undefined). You can't really avoid it as it could happen due to end-user browser settings.

@akorchev commented on GitHub (Sep 20, 2023): This error happens if the Radzen.Blazor JS file fails to load for some reason (Radzen is undefined). You can't really avoid it as it could happen due to end-user browser settings.
claunia commented 2026-01-29 17:47:27 +00:00
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@OndrejUzovic commented on GitHub (Sep 22, 2023):

Are there any particular browser settings which can cause it?
(In my case when it happens then after F5 (refresh) the page is reloaded and everything works fine.)

@OndrejUzovic commented on GitHub (Sep 22, 2023): Are there any particular browser settings which can cause it? (In my case when it happens then after F5 (refresh) the page is reloaded and everything works fine.)
claunia commented 2026-01-29 17:47:28 +00:00
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@akorchev commented on GitHub (Sep 22, 2023):

I don't know of any browser settings that can cause a JS file not to load.

@akorchev commented on GitHub (Sep 22, 2023): I don't know of any browser settings that can cause a JS file not to load.
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Reference: starred/radzen-blazor#992
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