WebView navigation

Remarks:

All examples that fetch data from a remote URL, has to have "Internet (client)" capability checked in the Package.appxmanifest. For examples that only manipulate local data it's not necessary.

Navigate to Uri

This code simply navigates WebView to some Uri:

this.webView.Navigate(new Uri("http://stackoverflow.com/"));

this.webView.Source = new Uri("http://stackoverflow.com/");

Navigate with HttpRequestMessage

Set custom user agent and navigate to Uri:

var userAgent = "my custom user agent";
var uri = new Uri("http://useragentstring.com/");
var requestMessage = new HttpRequestMessage(HttpMethod.Get, uri);
requestMessage.Headers.Add("User-Agent", userAgent);

this.webView.NavigateWithHttpRequestMessage(requestMessage);

Navigate to string

Show specified html string in WebView:

var htmlString = 
    @"<!DOCTYPE html>
      <html>
          <head><title>HTML document</title></head>
          <body>
              <p>This is simple HTML content.</p>
          </body>
      </html>";

this.webView.NavigateToString(htmlString);

Open HTML file from app package

You can easily open a file from your app package, but Uri scheme must be "ms-appx-web" instead of "ms-appx":

var uri = new Uri("ms-appx-web:///Assets/Html/html-sample.html");
this.webView.Navigate(uri);

Open HTML file from app local folder or temp folder

To open a file from local folder or temp folder, target file must not be located in those folders' root. For security reasons, to prevent other content from being exposed by WebView, the file meant for displaying must be located in a subfolder:

var uri = new Uri("ms-appdata:///local/html/html-sample.html");
this.webView.Navigate(uri);

NavigateToLocalStreamUri

In case when NavigateToString can't handle some content, use NavigateToLocalStreamUri method. It will force every locally-referenced URI inside the HTML page to call to the special resolver class, which can provide right content on the fly.

Assets/Html/html-sample.html file:

<!DOCTYPE html>
<html>
    <head>
        <title>HTML document</title>
    </head>
    <body>
        <p>This is simple HTML content.</p>
        <img src="cat.jpg"/>
    </body>
</html>

Code:

protected override void OnNavigatedTo(NavigationEventArgs args)
{
    // The Uri resolver takes is in the form of "ms-local-stream://appname_KEY/folder/file"
    // For simplicity, there is method BuildLocalStreamUri which returns correct Uri.
    var uri = this.webView.BuildLocalStreamUri("SomeTag", "/html-sample.html");
    var resolver = new StreamUriResolver();
    this.webView.NavigateToLocalStreamUri(uri, resolver);

    base.OnNavigatedTo(args);
}


public sealed class StreamUriResolver : IUriToStreamResolver
{
    public IAsyncOperation<IInputStream> UriToStreamAsync(Uri uri)
    {
        if (uri == null)
        {
            throw new ArgumentNullException(nameof(uri));
        }

        var path = uri.AbsolutePath;

        return GetContent(path).AsAsyncOperation();
    }


    private async Task<IInputStream> GetContent(string uriPath)
    {
        Uri localUri;

        if (Path.GetExtension(uriPath).Equals(".html"))
        {
            localUri = new Uri("ms-appx:///Assets/Html" + uriPath);
        }
        else
        {
            localUri = new Uri("ms-appdata:///local/content" + uriPath);
        }

        var file = await StorageFile.GetFileFromApplicationUriAsync(localUri);
        var stream = await file.OpenAsync(FileAccessMode.Read);

        return stream.GetInputStreamAt(0);
    }
}

This code will take HTML page from app package and embed content from local folder into it. Provided that you have image "cat.jpg" in /local/content folder, it will show HTML page with cat image.

Contributors

Topic Id: 6321

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