EvaluateJavaScriptAsync does not work if WebViewRenderer is used

[yaho86]

Description

WebView.EvaluateJavaScriptAsync does nothing if WebViewRenderer is used. It works fine with default handler, though.

Probably caused by this condition

maui/src/Controls/src/Core/WebView.cs

Line 117 in d94a1ad

if (_evaluateJavaScriptRequested?.GetInvocationList().Length == 0)

Steps to Reproduce

1. Enable compatibility mode and register WebViewRenderer

var builder = MauiApp.CreateBuilder();
builder
  .UseMauiApp<App>()
  .UseMauiCompatibility()
  .ConfigureMauiHandlers((handlers) => {
#if ANDROID
    handlers.AddCompatibilityRenderer(typeof(WebView), typeof(WebViewRenderer));
#endif
  });

2. Add WebView like so <WebView Source="..." />
3. Call WebView.EvaluateJavaScriptAsync("alert('Hello')") (or any other JS code)
4. JS code is not executed

Version with bug

6.0.400

Last version that worked well

Unknown/Other

Affected platforms

Android, I was not able test on other platforms

Affected platform versions

Android 12

Did you find any workaround?

Use handler instead of renderer.

Relevant log output

No response

[NiladriPadhy]

When using handlers instead of renderers, EvaluateJavaScriptAsync method not found since its implemented from IView interface. Need implementation for EvaluateJavaScriptAsync method.

[NiladriPadhy]

Any update on this?

[jsuarezruiz]

Could you try with the latest version (net7 rc2)?. Tried but cannot reproduce the issue.

[ghost]

Hi @yaho86. We have added the "s/needs-info" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[Shishim4ru]

When using handlers instead of renderers, EvaluateJavaScriptAsync method not found since its implemented from IView interface. Need implementation for EvaluateJavaScriptAsync method.

Here you can find an implementation of the handler based on IWebView instead of IView https://github.com/Shishim4ru/MAUIWebViewExample

[yaho86]

Could you try with the latest version (net7 rc2)?. Tried but cannot reproduce the issue.

It still doesn't work with the latest version of .NET 7.0.
The code from .NET MAUI Samples calls MauiWebView.Eval("alert('text')"); and it works. But on the next line it calls MauiWebView.EvaluateJavaScriptAsync() that doesn't work, see

maui/src/Controls/samples/Controls.Sample/Pages/Controls/WebViewPage.xaml.cs

Line 75 in d94a1ad

var result = await MauiWebView.EvaluateJavaScriptAsync(

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.