how can i parse html in flutter?

Question

I am using Flutter and want to parse HTML using parser.dart

<div class="weather-item now"><!-- now  -->
   <span class="time">Now</span>
   
    <div class="temp">19.8<span>℃</span>
        <small>(23℃)</small>
    </div>
   
   <table>
       <tr>
           <th><i class="icon01" aria-label="true"></i></th>
           <td>93%</td>
       </tr>
       <tr>
           <th><i class="icon02" aria-label="true"></i></th>
           <td>south 2.2km/h</td>
       </tr>
       <tr>
           <th><i class="icon03" aria-label="true"></i></th>
           <td>-</td>
       </tr>
   </table>
</div>

Using, import 'package:html/parser.dart';

I want to get this data

Now,19.8,23,93%,south 2.2km/h

How can I do this?

Answer 1

Since you are using the html package, you can get the desired data like so using some html parsing and string processing (as needed), here is a dart sample, you can use the parseData function as is in your flutter application -

main.dart

import 'package:html/parser.dart' show parse;

main(List<String> args) {
  parseData();
}

parseData(){
  var document = parse("""
    <div class="weather-item now"><!-- now  -->
   <span class="time">Now</span>
   
    <div class="temp">19.8<span>℃</span>
        <small>(23℃)</small>
    </div>
   
   <table>
       <tr>
           <th><i class="icon01" aria-label="true"></i></th>
           <td>93%</td>
       </tr>
       <tr>
           <th><i class="icon02" aria-label="true"></i></th>
           <td>south 2.2km/h</td>
       </tr>
       <tr>
           <th><i class="icon03" aria-label="true"></i></th>
           <td>-</td>
       </tr>
   </table>
</div>
  """);

  //declaring a list of String to hold all the data.
  List<String> data = [];

  data.add(document.getElementsByClassName("time")[0].innerHtml);

  //declaring variable for temp since we will be using it multiple places
  var temp  = document.getElementsByClassName("temp")[0];
  data.add(temp.innerHtml.substring(0, temp.innerHtml.indexOf("<span>")));
  data.add(temp.getElementsByTagName("small")[0].innerHtml.replaceAll(RegExp("[(|)|℃]"), ""));

  //We can also do document.getElementsByTagName("td") but I am just being more specific here.
  var rows = document.getElementsByTagName("table")[0].getElementsByTagName("td");

  //Map elememt to its innerHtml,  because we gonna need it. 
  //Iterate over all the table-data and store it in the data list
  rows.map((e) => e.innerHtml).forEach((element) {
    if(element != "-"){
      data.add(element);
    }
  });

  //print the data to console.
  print(data);
  
}

Here's the sample output -

[Now, 19.8, 23, 93%, south 2.2km/h]

Hope it helps!