Flutter uses the Dart programming language and has a built-in web scraping tool called the Flutter Web Scraper.
The Flutter Web Scraper is used to extract data from websites and convert it into a usable format for Flutter applications.
To scrap the web using flutter follow this steps:
Import the Flutter Web Scraper library by adding the following line to your pubspec.yaml file:
dependencies:
flutter_web_scraper: any
Or you can also use
dependencies:
http:any
If you are using flutter web scrapper Import the Flutter Web Scraper library in your code by adding the following line to the top of your file:
import 'package:flutter_web_scraper/flutter_web_scraper.dart';
Use the Flutter Web Scraper to send an HTTP request to the website you want to scrape data from. You can do this using the following code:
FlutterWebScraper scraper = FlutterWebScraper();
String html = await scraper.get('https://www.example.com');
Use the HTML or XML data returned by the HTTP request to extract the data you want. You can do this using various techniques, such as parsing the data using regular expressions or using a library like html.parse.
Add the HTML library to your pubspec.yaml file by adding a dependency line in the dependencies section. For example:
dependencies:
html: any
Use the extracted data in your Flutter application as desired.
For example, you might use the Flutter Web Scraper to scrape data from a news website and display the latest headlines in your Flutter application. You could also use it to scrape data from an e-commerce website and display product information in your app.
Here is an example of a simple web scraper using the Flutter framework and the http and html package to fetch and parse HTML from a website:
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:html/parser.dart' show parse;
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Web Scraper',
home: Scaffold(
appBar: AppBar(
title: Text('Flutter Web Scraper'),
),
body: WebScraper(),
),
);
}
}
class WebScraper extends StatefulWidget {
@override
_WebScraperState createState() => _WebScraperState();
}
class _WebScraperState extends State {
// The URL to fetch data from
final String url = 'https://www.example.com';
// The data we want to extract from the website
String data = '';
// Function to fetch and parse data from the website
fetchData() async {
// Fetch data from the website
var response = await http.get(url);
// Parse the HTML from the website
var document = parse(response.body);
// Extract the data we want from the HTML document
data = document.querySelector('#some-element').text;
// Update the state to trigger a rebuild of the UI
setState(() {});
}
@override
Widget build(BuildContext context) {
return Column(
children: [
RaisedButton(
onPressed: fetchData,
child: Text('Fetch Data'),
),
Text(data),
],
);
}
}
This example fetches data from the website at the specified url when the user clicks the "Fetch Data" button, parses the HTML from the website using the parse function from the html package, and extracts the data we want from the HTML document using a CSS selector. Finally, it updates the state of the widget to trigger a rebuild of the UI with the extracted data displayed.
Another way if you are using flutter_web_scrapper
You can do simply like
import 'package:flutter_web_scraper/flutter_web_scraper.dart';
// Scrape data from a website
var data = await FlutterWebScraper.scrape('https://www.example.com', (document) {
// Extract the data you want from the document using CSS selectors
var element = document.querySelector('#some-element');
return element.text;
});
This will scrape the website at the specified URL, parse the HTML, and pass the parsed document to the callback function. You can then extract the data you want from the document using CSS selectors and return it from the callback. The data variable will contain the returned data.
I hope this helps you ! Please Let me know if you have any questions.
