react-native-signalr/src/jquery-function.js

Connect to a SignalR server from react-native

export default subject => {
  const getEvents = () => subject.events || {};

  if (subject && subject === subject.window) {
    return {
      0: subject,
      load: handler => subject.addEventListener("load", handler, false),
      bind: (event, handler) => subject.addEventListener(event, handler, false),
      unbind: (event, handler) => subject.removeEventListener(event, handler, false),
    };
  }

  return {
    0: subject,
    unbind(event, handler) {
      const events = getEvents();
      let handlers = events[event] || [];

      if (handler) {
        const idx = handlers.indexOf(handler);
        if (idx !== -1) {
          handlers.splice(idx, 1);
        }
      } else {
        handlers = [];
      }

      events[event] = handlers;
      subject.events = events;
    },
    bind(event, handler) {
      const events = getEvents();
      const current = events[event] || [];
      events[event] = current.concat(handler);
      subject.events = events;
    },
    triggerHandler(event, args) {
      const events = getEvents();
      const handlers = events[event] || [];
      handlers.forEach(fn => {
        if (args === undefined) {
          args = { type: event };
        }
        if (!Array.isArray(args)) {
          args = [args];
        }
        if (args && args[0] && args[0].type === undefined) {
          args = [
            {
              type: event,
            },
          ].concat(args || []);
        } else {
          args = args || [];
        }

        fn.apply(this, args);
      });
    },
  };
};