SEO Renderer

A flutter plugin (under development) to render text, link, image widgets as html elements for SEO purpose.

Created specifically for issue github.com/flutter/flutter/issues/46789 It will automatic detect the crawler using regex and navigator userAgent and add the HtmlElement you choose to the DOM.

All PR's are welcome :)

Getting Started

Add this to your pubspec.yaml
```
dependencies:
  seo_renderer: ^0.6.0
```
Get the package from Pub:
```
flutter packages get
```

Import it in your file

import 'package:seo_renderer/seo_renderer.dart';

Usage

It's required to add a RobotDetector to detect if page is visited by a robot and add seoRouteObserver to observe when widgets change their visibility. To do this simply wrap MaterialApp within RobotDetector and add seoRouteObserver in navigatorObservers:

runApp(
  RobotDetector(
    debug: true, // you can set true to enable robot mode
    child: MaterialApp(
      home: MyApp(),
      navigatorObservers: [seoRouteObserver],
    ),
  ),
);

For more complex projects it's recommended to add these lines in index.html which will force html web renderer in case robot is detected. It's because canvaskit has some stricter limits and potenitally can break.

<body>
  ...
  <script>
    const regExp = new RegExp("bot|google|baidu|bing|msn|teoma|slurp|yandex", "i");
    if (regExp.test(navigator.userAgent)) {
      window.flutterWebRenderer = "html";
    }
  </script>
  ...
</body>

TextRenderer

To render html text element above a child you pass Text, RichText as the child or simply set the text.

TextRenderer(
  child: Text(
    'Lorem Ipsum is simply dummy text of the printing and typesetting industry.',
  ),
)

TextRenderer(
  text: 'Lorem Ipsum is simply dummy text of the printing and typesetting industry.',
  child: CustomWidget(),
)

Optionally you can change the html element between <h1> to <h6> and <p> by setting style. Default value is TextRendererStyle.paragraph.

TextRenderer(
  style: TextRendererStyle.paragraph,
  child: Text(
    'Lorem Ipsum is simply dummy text of the printing and typesetting industry.',
  ),
)

TextRenderer(
  style: TextRendererStyle.header1,
  child: Text(
    'Lorem Ipsum is simply dummy text of the printing and typesetting industry.',
  ),
)

LinkRenderer

To render html link element above a child set text and href.

LinkRenderer(
  text: 'Try Flutter',
  href: 'https://www.flutter.dev',
  child: ...,
)

ImageRenderer

To render html image element above a child set alt and pass Image.network(...), Image.asset(...), Image.memory(...) as the child or simply set the src.

ImageRenderer(
  alt: 'Network Image',
  child: Image.network('https://fakeimg.pl/300x300/?text=Network'),
)

ImageRenderer(
  alt: 'Network Image',
  src: 'https://fakeimg.pl/300x300/?text=Network',
  child: CustomWidget(),
)

ScreenShot & Example

Live example seo-renderer.netlify.app/

Select GoogleBot here's how as userAgent in Network Condition and refresh the page to see created Div Elements.

License

MIT License

Copyright (c) 2021 Sahdeep Singh

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Author & support

This project is created by Sahdeep Singh

If you appreciate my work you can connect and endorse me on LinkedIn to keep me motivated :)

Don't forget to check out these AWESOME contributors