react-native-signalr/src/ajax.js

Connect to a SignalR server from react-native

const qs = data => {
  let results = [];
  for (const name in data)
    results.push(`${name}=${encodeURIComponent(data[name])}`);
  return results.join('&');
};

export default (headers, options) => {
  const request = new XMLHttpRequest();
  let aborted = false;
  request.onreadystatechange = () => {
    if (request.readyState !== 4 || aborted) {
      return;
    }

    if (request.status === 200 && !request._hasError && options.success) {
      try {
        options.success(JSON.parse(request.responseText));
      } catch (e) {
        options.error(request, e);
      }
    } else if (options.error) {
      options.error(request, request._response);
    }
  };

  request.open(options.type, options.url);
  request.setRequestHeader('content-type', options.contentType);

  if (options.xhrFields) {
    Object.keys(options.xhrFields).forEach(key => {
      const value = options.xhrFields[key];
      request[key] = value;
    });
  }

  if (headers) {
    Object.keys(headers).forEach(key => {
      const value = headers[key];
      request.setRequestHeader(key, value);
    });
  }

  request.send(
    options.type === 'POST' ? options.data && qs(options.data) : undefined,
  );

  return {
    abort: reason => {
      aborted = true;
      return request.abort(reason);
    },
  };
};