[Features]/Question About RegisterJsMethod

[BrandonMayjeye]

What platform are you experiencing this issue on?

Windows x64

What version of UWB are you using?

2.2.1

What Unity version are you running?

2022.3.48f1

Describe what the issue you are experiencing is.

Hello, I read over the wiki for javascript , found this method RegisterJsMethod
however i noticed that this method calls jsMethodManager.RegisterJsMethod
when supplying a function that returns anything but void

         if (methodInfo.ReturnType != typeof(void))
                throw new UnsupportedTypeException("The provided method must return void!");

I am unable to pull any data from unity into the browser using methods like this.

I have in the meantime used a solution that calls ExecuteJs to add the data to a list that is polled periodically in js with a Observable to achieve the results i need.
client.ExecuteJs($@"window.dotnetComLayer.returnData.push(JSON.parse('{jsonData}'))");

My question is , will this method (RegisterJsMethod) in the future accept functions with return values ?

or is there something i have missed maybe another function somewhere?

Provide reproducible steps for this issue.

1. question

Any additional info you like to provide?

No response

[Voltstro]

I don't really understand what you are asking sorry.

JSMethodManager.RegisterJsMethod does not take any methods that returns anything but void because the JS method manager it self doesn't need anything back. If you are asking on how to return something back to the initial JS call of uwb.ExecuteJsMethod function, that is impossible due to way CEF works. The only way to return something back after a JS Method manager calls your method is to simply call ExecuteJs again.

using UnityEngine;
using VoltstroStudios.UnityWebBrowser;

public class JSTest : MonoBehaviour
{
    public WebBrowserUIBasic webBrowser;
    
    public void Start()
    {
        webBrowser.browserClient.RegisterJsMethod<string>("UwbSend", UwbSend);
    }

    private void UwbSend(string value)
    {
        Debug.Log($"Got value of {value} from JS... send another response.");
        string responseValue = "Test Value Back";
        webBrowser.browserClient.ExecuteJs($"uwbReturn('{responseValue}')");
    }
}

// Invoked by something (like a button on a page)
function uwbSend() {
    uwb.ExecuteJsMethod('UwbSend', 'Test Value');
}

// Invoked by UWB's ExecuteJs
function uwbReturn(value) {
    console.log(value);
}

[BrandonMayjeye]

Ok thank you , thats basically what my question was and the conclusion that i came
this is what i created in javascript to navigate through this, on my project i need to be able to call unty functions from the browser and collect data from within the game.

function executeCommand(command, argument) {
    const subscribers = [];
    const cindex = this.window.dotnetComLayer.returnData.length;

    // Execute the command'
    if(!argument)
        uwb.ExecuteJsMethod(command);
    else
        uwb.ExecuteJsMethod(command, argument);

    const intervalId = setInterval(() => {
        if (this.window.dotnetComLayer.returnData.length > cindex) {
            // Notify all subscribers
            const newData = this.window.dotnetComLayer.returnData[cindex];
            subscribers.forEach(callback => callback(newData));
            // Optionally clear the interval if you expect only one update
            clearInterval(intervalId);
        }else{
            console.log('not found');
        }
    }, 50);

    // Function to subscribe to data changes
    return {
        subscribe(callback) {
            subscribers.push(callback);
            // Return an unsubscribe function
            return () => {
                const index = subscribers.indexOf(callback);
                if (index !== -1) {
                    subscribers.splice(index, 1);
                }
            };
        }
    };
}

and in the html file where i need this info

   executeCommand('http', {
                    'Url': "com.search",
                    'Action': 'search',
                    'Parameter': this.searchInput
                }).subscribe(data => {
                    this.searchResults = data;
                    this.isSearching = false;
                    console.log("Search results received:", data);
                });