js_bindings 0.1.2

Complete JS bindings interop with autocomplete and documentation.

example/main.dart

import 'package:collection/collection.dart';
import 'package:js/js.dart';
import 'package:js_bindings/js_bindings.dart';

@JS()
external JsIterator<num> makeRangeIterator([num start, num end, num step]);

@JS()
external JsArray<String> testArray;

@JS()
external JsArray<String> testArray2;

Future<void> _fetch() async {
  try {
    final r = await window.fetch(
        'https://jsonplaceholder.typicode.com/todos/1', RequestInit());
    print('Fetch finished: $r');
    window.console.log(r);
  } catch (e) {
    print('Error while fetching: $e');
    print(StackTrace.current);
  }
}

void main() {
  window.document.title = 'JS Bindings example';

  var init = RequestInit(
      method: 'GET',
      referrer: '',
      duplex: RequestDuplex.half,
      referrerPolicy: ReferrerPolicy.origin,
      mode: RequestMode.cors,
      credentials: RequestCredentials.omit,
      cache: RequestCache.noCache,
      redirect: RequestRedirect.follow,
      integrity: '',
      keepalive: true);

  print('RequestInit:');
  window.console.log(init);

  _fetch().then((ev) => print('Fetch test finished.'));

  final response = ResponseInit();

  print('Response.status == 200 // ${response.status == 200}');

  print('External array: ');
  window.console.log(
    testArray,
    testArray2,
  ); //testArray.concat(testArray2));

  print('Checking iterator');
  final ranged = makeRangeIterator();

  var result = ranged.next();
  while (!result.done) {
    print('ranged: ${result.value}'); // 1 3 5 7 9
    result = ranged.next();
  }

  print('DartIterable from Iterator: ${ranged.toIterable()}');

  final map = JsMap([
    [1, 'one'],
    [2, 'two'],
    [3, 'three'],
  ]);

  window.console.log(map, map.keys, map.keys.toList());
  window.console.log(map[1]);

  // create the buttons to use in the example
  final div = (document.createElement('div') as HTMLDivElement)
    ..id = 'someDiv'
    ..innerHTML = 'This div was created on the fly. '
        'Node.elementNode: ${Node.elementNode}. '
        'Map: ${map.keys.toList().map((k) => '$k: ${map[k]}').join(', ')}. '
    ..style.setProperty('border', '1px solid black')
    ..style.setProperty('margin', '10px');
  final btnChanger = (document.createElement('button') as HTMLButtonElement)
    ..id = 'changeHtml'
    ..innerText = 'Change the above div HTML';
  final btnMedia = (document.createElement('button') as HTMLButtonElement)
    ..innerText = 'Ask for camera access';
  final video = (document.createElement('video') as HTMLVideoElement)
    ..autoplay = true
    ..style.setProperty('border', '1px solid purple')
    ..style.setProperty('margin', '10px')
    ..style.setProperty('height', '300px')
    ..style.setProperty('width', '500px')
    ..style.setProperty('background', 'black');

  MediaStream? mstream;
  final body = document.body!;

  // add the div and bind a listener to the HTML changer button
  body
    ..appendChild(div)
    ..appendChild(btnChanger)
    ..appendChild(btnMedia)
    ..appendChild(document.createElement('hr'))
    ..appendChild(video);

  document.getElementById('changeHtml')!.addEventListener('click', (e) {
    window.console.log('Changing the HTML');
    document.getElementById('someDiv')!.innerHTML = 'New stuff oh yeah!';
  });

  div.childNodes.toList().forEachIndexed((index, element) {
    print('CHILDNODE[$index] = $element. ${element.runtimeType}');
  });

  // listen to the click of the media button
  btnMedia.addEventListener('click', (e) async {
    final ms = mstream;

    // if we already have the stream, stop it and change the HTML of the button
    if (ms != null) {
      // forEach is not working in Dart2JS:
      // https://github.com/dart-lang/sdk/issues/48260
      // ms.getTracks().forEach((track) => track.stop());

      for (final track in ms.getTracks()) {
        track.stop();
      }

      mstream = null;
      btnMedia.innerHTML = 'Ask for camera access';
      window.console.log('Media stopped.');
      return;
    }

    window.console.log('Asking for camera capture');

    final media = mstream = await window.navigator.mediaDevices
        .getUserMedia(MediaStreamConstraints(video: true));

    window.console.log('asked: ${media.id}, ${media.active}');

    // here the media stream is on,
    // lets set it to the source of the video element
    video.srcObject = media;

    if (media.active) {
      // change the label of the button so user
      // can know he can stop the camera stream.
      // to test, lets use textContent instead of innerHTML
      btnMedia.textContent = 'Stop camera capture';
    }
  });

  for (final child in document.body!.childNodes.toList()) {
    print('Child ${child.nodeName}');
  }
}