HybridWebView - RawMessageReceived event is not firing in .NET MAUI 9 RC1

[egvijayanand]

Description

HybridWebView - RawMessageReceived event is not firing in .NET MAUI 9 RC1.

This worked fine in .NET MAUI 9 Preview 7.

Note: Add the RC1 version in the Version with bug field and Preview 7 version in the Last version that worked well field.

Steps to Reproduce

1. Clone the solution in the referenced GitHub repo
2. Build and run the app
3. Type and send a message from JS to C# from the second text field from the top.
4. Typically, this message would be received in the code-behind event handler but it's not working

Link to public reproduction project repository

https://github.com/egvijayanand/maui-issue-24705

Version with bug

9.0.0-rc.1.24453.9

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI.

Last version that worked well

9.0.0-preview.7.24407.4

Affected platforms

Windows, I was not able test on other platforms

Affected platform versions

Windows SDK 10.0.19041

Did you find any workaround?

Nope.

Relevant log output

The message is logged with one character per line in the Web Dev Tools Debug console. It seems some dev debugging piece checked in.

[egvijayanand]

Here's the link to the repository with a sample project to simulate this issue.

https://github.com/egvijayanand/maui-issue-24705

[Zhanglirong-Winnie]

This issue has been verified using Visual Studio 17.12.0 Preview 2.0(9.0.0-rc.1.24453.9 & 9.0.0-preview.7.24407.4). Can repro on Windows platform. On 9.0.0-preview.7.24407.4 works fine.

[mattleibow]

@Eilon thoughts?

[Eilon]

Hi @egvijayanand , it's probably because the HybridWebView.js file is out-of-date. It changed significantly from preview7 to rc1.

In your app replace the contents of this file: https://github.com/egvijayanand/maui-issue-24705/blob/main/src/HwvApp/Resources/Raw/wwwroot/scripts/hwv.js

With this file: https://github.com/dotnet/maui/blob/release/9.0.1xx-rc1/src/Controls/samples/Controls.Sample/Resources/Raw/HybridSamplePage/scripts/HybridWebView.js

[egvijayanand]

There's no mention about the modifications in the changelog?

Kindly include it here.

https://github.com/dotnet/core/blob/main/release-notes%2F9.0%2Fpreview%2Frc1%2Fdotnetmaui.md

And also suggest to pack the associated JS as an embedded resource like Blazor with a naming convention and a reference can be in the HTML file, so that it need not be looked into for every version.

[Eilon]

Thanks @egvijayanand , I sent a PR here to update the notes: dotnet/core#9501

For embedding the JS file, that is unfortunately out of scope for .NET 9 right now but definitely something we'll look into in the future.

[egvijayanand]

Cool, the release notes got updated.

#24730 - Logged as a feature request to track the JS as an embedded resource.