bbenetskyy/XFPage.xaml.cs

## XFPage.xaml.cs
ChatWebView.Source = new HtmlWebViewSource
{
    Html = "<html><head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"></head><body>" +
           "<script type=\"text/javascript\">" +
           "        function Run(text) {    try {        InvokeDisplayJSText(link);   }    catch(err) {        alert(err);    }} " +
           "        function DisplayXFText(text) {    alert('DisplayXFText ' + text);    } " +
           "</script >" +
           "<p><a href=\"#\" onclick=\"Run('Hello');\">Send 'Hello' to Xamarin.Forms</a></p>" +
           "<p><a href=\"#\" onclick=\"Run2('From JS');\">Send 'From JS' to Xamarin.Forms</a></p>" +
           "</body ></html >"
};
ChatWebView.RegisterDisplayJSTextAction(DisplayJSTextAction);


        protected override void OnAppearing()
        {
            _ = Task.Run(async () =>
            {
                await Task.Delay(TimeSpan.FromSeconds(3));
                ChatWebView.SetXFAppText("Text from Xamarin.Forms Application");
            });
        }


        private void DisplayJSTextAction(string text)
        {
           Device.InvokeOnMainThreadAsync(async () => await Application.Current.MainPage.DisplayAlert(text, string.Empty, "Great"));
        }
	ChatWebView.Source = new HtmlWebViewSource
	{
	Html = "<html><head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"></head><body>" +
	"<script type=\"text/javascript\">" +
	" function Run(text) { try { InvokeDisplayJSText(link); } catch(err) { alert(err); }} " +
	" function DisplayXFText(text) { alert('DisplayXFText ' + text); } " +
	"</script >" +
	"<p><a href=\"#\" onclick=\"Run('Hello');\">Send 'Hello' to Xamarin.Forms</a></p>" +
	"<p><a href=\"#\" onclick=\"Run2('From JS');\">Send 'From JS' to Xamarin.Forms</a></p>" +
	"</body ></html >"
	};
	ChatWebView.RegisterDisplayJSTextAction(DisplayJSTextAction);


	protected override void OnAppearing()
	{
	_ = Task.Run(async () =>
	{
	await Task.Delay(TimeSpan.FromSeconds(3));
	ChatWebView.SetXFAppText("Text from Xamarin.Forms Application");
	});
	}


	private void DisplayJSTextAction(string text)
	{
	Device.InvokeOnMainThreadAsync(async () => await Application.Current.MainPage.DisplayAlert(text, string.Empty, "Great"));
	}