flutter_html_renderer

Simple HTML renderer for flutter. Converts HTML into Widgets.

Warning: This is alpha version! It is not recommended to use in production projects as API may still change!

Why

Pub now offers variety of HTML parsing plugins. In time of creation of this plugin, there was no available solution that had all of the following points:

  • Simple and understandable codebase
  • Optimized rendering
  • Extensibility
  • Robust HTML implementation

Installation

To use this plugin, add flutter_html_renderer as a dependency in your pubspec.yaml file.

Example

// IMPORT PACKAGE
import 'package:flutter_html_renderer/flutter_html_renderer.dart';

// INITIALIZE FROM HTML STRING.
Widget widget = HtmlRenderer(
    initialHtmlString: htmlString,
),

// INITIALIZE FROM HTML DOM NODES.
import 'package:html/parser.dart' as htmlParser;
HtmlRenderer(
    initialNodes: htmlParser.parse(htmlString).nodes, //you may have NodeList from other custom logic
),

// ENABLE WIDGET CACHE.
Widget widget = HtmlRenderer(
    initialHtmlString: htmlString,
    keepAlive: true
),

// ADD CUSTOM LINK CLICK HANDLER
HtmlRenderer(
    initialHtmlString: htmlString,
    linkHandler: (String url) async {
      print("Custom link handling");
      return true;
  },
),

// CUSTOM RENDERING FOR DIV
class DivDescriptor extends ElementDescriptor {
      const DivDescriptor()
      : super(
        name: 'div',
        supported: true,
        isBlock: true,
      );
    
      @override
      Future<Widget> render(
          dom.Element element,
          BuildContext context,
          WidgetsFactory widgetsFactory,
          LinkHandler linkHandler,
          RenderingContext renderingContext) async {
            if(element.attributes['id'] == 'someSpecialFeature'){
                return Text('To use this feature visit our website!');
            }
            return null; // use default rendering
        );
      }
    
}

// REPLACE DEFAULT DESCRIPTOR WITH CUSTOM
WidgetsFactory.allElements['div'] = DivDescriptor(); 
// INITIALIZE RENDERER NORMALY
HtmlRenderer(
    initialHtmlString: htmlString,
    keepAlive: true,
    linkHandler: (String url) async {
      print("Custom link handling");
      return true;
  },
),

List of currently supported elements

  • Block level

    • body
    • html
    • address
    • article
    • aside
    • blockquote
    • details
    • dialog
    • div
    • dl
    • dt
    • fieldset
    • figcaption
    • figure
    • footer
    • h1, h2, h3, h4, h5, h6
    • header
    • hgroup
    • main
    • nav
    • p
    • section
    • iframe (partial support: only iframes embeding YouTube videos)
  • Inline

    • abbr
    • acronym
    • cite
    • img
    • label
    • span

Roadmap

  • v 0.2.0 - support for formating elements (b, i, strong, ...)
  • v 0.3.0 - support for ul, ol, li
  • v 0.4.0 - support for tables
  • v 0.5.0 - polishing of default rendering of all element supported so far

Support for other tags will have to analyzed first. Roadmap may change depending on reported bugs and/or feature requests.

  • Elements that have planned support, but are not yet in roadmap
    • iframe
    • video
    • audio

Form elements are currently not planned before first stable release.

CSS and advanced styling support is not planned before first stable release

TODOs

  • Add tests

Contribution and Support

  • Contributions are welcome!
  • If you want to contribute code please create a PR
  • If you find a bug or want a feature, please fill an issue

Libraries

flutter_html_renderer
flutter_html_renderer