Uno: WebAssemblyRuntime.InvokeJS get value from callback?

[Ali-YousefiTelori]

Hi,
How can I get callback result from Uno.Foundation.WebAssemblyRuntime.InvokeJS ?
for example like Promise in javascript etc...

[carldebilly]

You need to call back your code from js/ts. We're already doing that for the wasm http handler if you want an example.

https://github.com/nventive/Uno/blob/master/src/Uno.UI.Wasm/ts/HttpClient.ts

[Ali-YousefiTelori]

Thank you, I don't know ts, but i make this example:
C#

            var data = Uno.Foundation.WebAssemblyRuntime.InvokeJS("openFileDialog();");
            Console.WriteLine("result: " + data);

and js:

async function openFileDialog() {
    function resolveAfter2Seconds(x) {
        return new Promise(resolve => {
            setTimeout(() => {
                resolve(x);
            }, 2000);
        });
    }

    var x = await resolveAfter2Seconds(10);
    return x;
}

this always show me result "result: [object Promise]" not real data.

[jeromelaban]

Async functions are not supported by InvokeJS, which is synchronous. You need to call a C# method manually at the end like this.

[carldebilly]

@Ali-YousefiTelori @MatFillion
This feature has been merged into master and available as version 3.0.0-dev.25 on nuget.