public async void LoadUrl(string?url)
{
Uri uri = new Uri(url ?? string.Empty, UriKind.RelativeOrAbsolute);
if (!uri.IsAbsoluteUri)
{
await EnsureCoreWebView2Async();
CoreWebView2.SetVirtualHostNameToFolderMapping(
LocalHostName,
ApplicationPath,
Web.WebView2.Core.CoreWebView2HostResourceAccessKind.Allow);
uri = new Uri(LocalScheme + url, UriKind.RelativeOrAbsolute);
}
// TODO: Sync Cookies
try
{
Source = uri;
}
catch (Exception exc)
{
Debug.WriteLine(nameof(MauiWebView), $"Failed to load: {uri} {exc}");
}
}
public async void LoadHtml(string?html, string?baseUrl)
{
var mapBaseDirectory = false;
if (string.IsNullOrEmpty(baseUrl))
{
baseUrl = LocalScheme;
mapBaseDirectory = true;
}
// Generate a base tag for the document
var baseTag = $"<base href=\"{baseUrl}\"></base>";
string htmlWithBaseTag;
// Set up an internal WebView we can use to load and parse the original HTML string
// Make _internalWebView a field instead of local variable to avoid garbage collection
_internalWebView = new WebView2();
// TODO: For now, the CoreWebView2 won't be created without either setting Source or
// calling EnsureCoreWebView2Async().
await _internalWebView.EnsureCoreWebView2Async();
// When the 'navigation' to the original HTML string is done, we can modify it to include our <base> tag
_internalWebView.NavigationCompleted += async(sender, args) =>
{
// Generate a version of the <base> script with the correct <base> tag
var script = BaseInsertionScript.Replace("baseTag", baseTag, StringComparison.Ordinal);
// Run it and retrieve the updated HTML from our WebView
await sender.ExecuteScriptAsync(script);
htmlWithBaseTag = await sender.ExecuteScriptAsync("document.documentElement.outerHTML;");
htmlWithBaseTag = Regex.Unescape(htmlWithBaseTag);
htmlWithBaseTag = htmlWithBaseTag.Remove(0, 1);
htmlWithBaseTag = htmlWithBaseTag.Remove(htmlWithBaseTag.Length - 1, 1);
await EnsureCoreWebView2Async();
if (mapBaseDirectory)
{
CoreWebView2.SetVirtualHostNameToFolderMapping(
LocalHostName,
ApplicationPath,
Web.WebView2.Core.CoreWebView2HostResourceAccessKind.Allow);
}
// Set the HTML for the 'real' WebView to the updated HTML
NavigateToString(!string.IsNullOrEmpty(htmlWithBaseTag) ? htmlWithBaseTag : html);
// Free up memory after we're done with _internalWebView
_internalWebView = null;
};
// Kick off the initial navigation
_internalWebView.NavigateToString(html);
}
public MauiWebView()
{
NavigationStarting += (sender, args) =>
{
// Auto map local virtual app dir host, e.g. if navigating back to local site from a link to an external site
if (args?.Uri?.ToLowerInvariant().StartsWith(LocalScheme.TrimEnd('/').ToLowerInvariant()) == true)
{
CoreWebView2.SetVirtualHostNameToFolderMapping(
LocalHostName,
ApplicationPath,
Web.WebView2.Core.CoreWebView2HostResourceAccessKind.Allow);
}
// Auto unmap local virtual app dir host if navigating to any other potentially unsafe domain
else
{
CoreWebView2.ClearVirtualHostNameToFolderMapping(LocalHostName);
}
};
}