How to show html string in text widget flutter

Question

How to show html tag string in flutter, i have tried a plugin and its not working.

new HtmlView(
     data: html,
     baseURL: "", // optional, type String
     onLaunchFail: (url) { // optional, type Function
     print("launch $url failed");
   }

This is my html

“Follow<a class='sup'><sup>pl</sup></a> what was sent down to you from your Lord, and do not follow other guardians apart from Him. Little do <span class='h'>you remind yourselves</span><a class='f'><sup f=2437>1</sup></a>.”   

i user flutter_html_view: "^0.5.10" this plugin

Solution 1

This plugin doesn`t have any issue, I just created a sample with your HTML and it works fine. Try to replace with below snippet and see if that works.

dependencies:
  flutter_html: ^0.8.2
        

and imports and code to render html

import 'package:flutter_html/flutter_html.dart';
import 'package:html/dom.dart' as dom;


 body: new Center(
            child: SingleChildScrollView(
              child: Html(
                data: """
                <div>Follow<a class='sup'><sup>pl</sup></a> 
                  Below hr
                    <b>Bold</b>
                <h1>what was sent down to you from your Lord</h1>, 
                and do not follow other guardians apart from Him. Little do 
                <span class='h'>you remind yourselves</span><a class='f'><sup f=2437>1</sup></a></div>
                """,
                padding: EdgeInsets.all(8.0),
                onLinkTap: (url) {
                  print("Opening $url...");
                },
                customRender: (node, children) {
                  if (node is dom.Element) {
                    switch (node.localName) {
                      case "custom_tag": // using this, you can handle custom tags in your HTML 
                        return Column(children: children);
                    }
                  }
                },
              ),
            ),
          )

Solution 2

I've just done the followings and it works fine.

1. Add flutter_html to your pubspec.yaml file.

dependencies:
  flutter:
    sdk: flutter
  flutter_html: ^0.8.2 

2. Run the following command to update packages.

flutter pub get

3. Import flutter_html

import 'package:flutter_html/flutter_html.dart';

4. Replace Text widget with Html widget.

   child: 
   // Text(
   //   "Hello Programmer",
   //   style: TextStyle(fontSize: 18),
   // ),
   Html(data:"<p>Hello <b>Flutter</b><p>"),

Solution 3

Do not use flutter_html_view that reading at the documentation:

Supported Tags

• p
• em
• b
• img
• video
• h1,
• h2,
• h3,
• h4,
• h5,
• h6
• Note

This plugin converts some of the html tags to flutter widgets This plugin does't support rendering full html code (there is no built in support for web rendering in flutter)

So it simply doesn't render well your html because it can't.

But you could find other pulugins, like flutter_html

https://github.com/Sub6Resources/flutter_html

and give them a try in order to see if they perform better.

UPDATE

In pubspec.yaml I've add

dependencies:
  flutter_html: ^0.8.2

and my main.dart is

import 'package:flutter/material.dart';
import 'package:flutter_html/flutter_html.dart';


void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  var html = "Follow<a class='sup'>pl</a> what was sent down to you from your Lord, and do not follow other guardians apart from Him. Little do <p class='h'>you remind yourselves</p><a class='f'><sup f=2437>1</a>.";


  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Html(
              data: html,
              ),
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Solution 4

Use flutter_webview_plugin plugin

example:

new WebviewScaffold(
              url: new Uri.dataFromString('<html><body>hello world</body></html>', mimeType: 'text/html').toString()

Webview inside custom Rectangle

final flutterWebviewPlugin = new FlutterWebviewPlugin();

flutterWebviewPlugin.launch(url,
  fullScreen: false,
  rect: new Rect.fromLTWH(
    0.0,
    0.0,
    MediaQuery.of(context).size.width,
    300.0,
  ),
);

Solution 5

Add the following to your pubspec.yaml file:

dependencies:
  flutter_html:

Currently Supported HTML Tags:

a, abbr, acronym, address, article, aside, b, bdi, bdo, big, blockquote, body, br, caption, cite, code, data, dd, del, dfn, div, dl, dt, em, figcaption, figure, footer, h1, h2, h3, h4, h5, h6, header, hr, i, img, ins, kbd, li, main, mark, nav, noscript, ol, p, pre, q, rp, rt, ruby, s, samp, section, small, span, strike, strong, sub, sup, table, tbody, td, template, tfoot, th, thead, time, tr, tt, u, ul, var

Example Usage:

Column(
   mainAxisAlignment: MainAxisAlignment.start,
   crossAxisAlignment: CrossAxisAlignment.start,
   children: [
      new Html(
         data: "<b>Welcome</b>,
          defaultTextStyle: TextStyle(fontSize: 15),
       ),
     ],
)

View more solutions

Comments

[Deepak Gehlot]

can you show me your code, i have checked but the pl not showing like yours.

[shadowsheep]

@DeepakGehlot sure. I've updated my answer. I've just modified the standard Flutter Activity project to test it.

[shadowsheep]

WebView cannot be add to the widget tree, ain’t it. Or am I miss something?

[Shyju M]

Have you checked the example code ? github.com/fluttercommunity/flutter_webview_plugin/blob/mast‌​er/…

[Shyju M]

its a Scaffold not a widget, if you want to insert into your existing page then you can make use of the webview in a rectangle flutterWebViewPlugin.launch( selectedUrl, rect: Rect.fromLTWH(0.0, 0.0, MediaQuery.of(context).size.width, 300.0), userAgent: kAndroidUserAgent, );

[shadowsheep]

Yep, I had :-). That's the reason of my question Warning: The webview is not integrated in the widget tree, it is a native view on top of the flutter view. you won't be able to use snackbars, dialogs ... The example code use it as a page not in the widget tree.

[Shyju M]

create your own scaffold and render the webview inside a rectangle, then you can use snackbars, dialog, etc

[shadowsheep]

Glad to know that, thanks. But I guess that that is beyond the OP question. Didn't you think that should be too much code to obtain what he's asking for?

[Deepak Gehlot]

unable to load this html using this plugin too, i have user WebviewScaffold just for testing and its not loading showing error "string contains invalid characters." <html><body> Follow<a class='sup'>^pl</a> what was sent down to you from your Lord, and do not follow other guardians apart from Him. Little do <span class='h'>you remind yourselves</span><a class='f'><sup f=2437>1</sup></a>. </body></html>

[Shyju M]

here is the working code gist.github.com/shyjuzz/d6fd5562f97b36b0e2eb957eff3c687a

[MNFS]

do u know another plugin beside flutter_html, this plugin cannot render table and is not selectable, thankyou

[Jet.B.Pope]

flutter_html supports <table>,<tbody>,<td>,<th>,<tr> now. Only thing it doesn't support is <style> which can be an issue for some people.

[Golden Lion]

the html data converts the div tags to spans on inspection. I need the div and the div id to be retained.

[Golden Lion]

you can use flutter data table to render table information in data rows and data columns and data cells

[uyhaW]

Hi I would like to implement it in flutter web, do you know some available packages?

[Elia Weiss]

github.com/fluttercommunity/flutter_webview_plugin/issues/77‌​2

[Elia Weiss]

I get Contains invalid characters.

[Shadab Hashmi]

how can i use porperties like overflow, maxlines in it??