Error Implementing IJsDialogHandler for JavaScript Dialog Handling

[bexado5413]

I'm working on a C# application using CefSharp to create a custom web browser. I need to handle JavaScript dialogs, such as alerts, confirms, and prompts. I have implemented a custom class that extends IJsDialogHandler to manage these dialogs, but I encounter issues when trying to use it.

Code Implementation:
Form1.cs -

using CefSharp;
using CefSharp.WinForms;
using System.Windows.Forms;

namespace BrowserTestApp
{
public partial class Form1 : Form
{
private ChromiumWebBrowser browser;

    public Form1()
    {
        InitializeComponent();

        // Initialize CefSharp
        InitializeCef();

        // Create and add ChromiumWebBrowser control
        browser = new ChromiumWebBrowser("https://javascript.info/alert-prompt-confirm")
        {
            Dock = DockStyle.Fill
        };

        // Set the custom JsHandler
        JsHandler jh = new JsHandler();
        browser.JsDialogHandler = jh;

        this.Controls.Add(browser);
    }

    private void InitializeCef()
    {
        CefSettings settings = new CefSettings();
        Cef.Initialize(settings);
    }
}

}

PromptForm.cs -

using System;
using System.Windows.Forms;

namespace BrowserTestApp
{
public partial class PromptForm : Form
{
public string Result { get; private set; }

    public PromptForm(string message, string defaultValue)
    {
        InitializeComponent();
        lblMessage.Text = message;
        txtInput.Text = defaultValue;
    }

    private void btnOK_Click(object sender, EventArgs e)
    {
        Result = txtInput.Text;
        DialogResult = DialogResult.OK;
        Close();
    }

    private void btnCancel_Click(object sender, EventArgs e)
    {
        DialogResult = DialogResult.Cancel;
        Close();
    }
}

}

JsHandler.cs -

using BrowserTestApp;
using CefSharp;
using System.Windows.Forms;

public class JsHandler : IJsDialogHandler
{
public void OnDialogClosed(IWebBrowser browserControl, IBrowser browser)
{
// Handle dialog closed event if needed
}

public bool OnJSAlert(IWebBrowser browser, string url, string message)
{
    MessageBox.Show("Alert Detected. Url: " + url + "\nMessage: " + message);
    return true; // Return true to close the dialog
}

public bool OnJSBeforeUnload(IWebBrowser browserControl, IBrowser browser, string message, bool isReload, IJsDialogCallback callback)
{
    // Handle before unload dialog if needed
    return false; // Return false to allow the unload
}

public bool OnJSConfirm(IWebBrowser browser, string url, string message, out bool retval)
{
    var result = MessageBox.Show("Confirm Detected. Url: " + url + "\nMessage: " + message, "Confirm", MessageBoxButtons.YesNo);
    retval = (result == DialogResult.Yes);
    return true; // Return true to indicate the dialog was handled
}

public bool OnJSDialog(IWebBrowser browserControl, IBrowser browser, string originUrl, CefJsDialogType dialogType, string messageText, string defaultPromptText, IJsDialogCallback callback, ref bool suppressMessage)
{
    // Handle other dialog types if needed
    return false;
}

public bool OnJSPrompt(IWebBrowser browser, string url, string message, string defaultValue, out bool retval, out string result)
{
    using (var promptForm = new PromptForm(message, defaultValue))
    {
        var dialogResult = promptForm.ShowDialog();
        retval = (dialogResult == DialogResult.OK);
        result = promptForm.Result;
        return true; // Return true to indicate the dialog was handled
    }
}

public void OnResetDialogState(IWebBrowser browserControl, IBrowser browser)
{
    // Reset dialog state if needed
}

}

Issue:
When I attempt to implement IJsDialogHandler, I encounter an error related to IJsDialogHandler that prevents successful compilation. The error message is:
interface CefSharp.IJsDialogHandler
Implement this interface to handle events related to JavaScript dialogs. The methods of this class will be called on the CEF UI thread.
CS0535: 'JsHandler' does not implement interface member 'IJsDialogHandler.OnBeforeUnloadDialog(IWebBrowser, IBrowser, string, bool, IJsDialogCallback)'

Request for Help:
Could anyone provide guidance on resolving this error?
Any help or suggestions would be greatly appreciated!
Thank you!

[amaitland]

https://github.com/cefsharp/CefSharp/blob/cefsharp/126/CefSharp/Handler/JsDialogHandler.cs

Inherit from the default implementation and just override the methods that you need.