When using the JavascriptObjectRepository.Register function in WinForms to facilitate mutual calls between JavaScript and C#, only lowercase function names are effective.

[JDDKCN]

Is there an existing issue for this?

• I have searched both open/closed issues, no issue already exists.

CefSharp Version

120.1.80

Operating System

Windows 11

Architecture

x64

.Net Version

.NET Framework 4.7.2

Implementation

WinForms

Reproduction Steps

• CSharp Code

        public void CefInitTest()
        {
            browser = new ChromiumWebBrowser("http://127.0.0.1:8080");
            CefSharpSettings.WcfEnabled = true;
            browser.JavascriptObjectRepository.Settings.LegacyBindingEnabled = true;
            browser.JavascriptObjectRepository.Register("BackendService", new BackendService(), isAsync: false, options: BindingOptions.DefaultBinder);
            panel1.Controls.Add(browser);
        }

    public class BackendService
    {
        public void OK(string msg,string title)
        {
            MessageBox.Show(msg,title);
        }
    }

• JS Code

function test() {
    BackendService.ok('Message', 'Title');
}

Expected behavior

When the JavaScript code is triggered, the WinForms window should pop up a MessageBox.

Actual behavior

• [Web Console] Uncaught ReferenceError: BackendService is not defined
• [VS Console] Uncaught TypeError: window.BackendService.OK is not a function

Regression?

I don't know.

Known Workarounds

Change the function names to lowercase; uppercase characters are not allowed.

Does this problem also occur in the CEF Sample Application

Yes using WinForms command line args

Other information

No response

[Goldenringz]

Beautiful !

[amaitland]

Converting to discussion as this is not a bug. Naming is done via convention. The default convention simply converts the first character to lowercase.

OK -> oK
Ok -> ok

If you wish to use a different convention then you can set IJavascriptObjectRepository.NameConverter. to your own instance of IJavascriptNameConverter

In future please use discussions to ask support questions.