@red-mobile/nodejs-mobile-cordova/install/sample-project/www/js/index.js

Node.js for Mobile Apps Cordova plugin

var app = {
  // Application Constructor
  initialize: function () {
    document.addEventListener(
      "deviceready",
      this.onDeviceReady.bind(this),
      false,
    );
  },

  // deviceready Event Handler
  //
  // Bind any cordova events here. Common events are:
  // 'pause', 'resume', etc.
  onDeviceReady: function () {
    this.receivedEvent("deviceready");
    startNodeProject();
  },

  // Update DOM on a Received Event
  receivedEvent: function (id) {
    var parentElement = document.getElementById(id);
    var listeningElement = parentElement.querySelector(".listening");
    var receivedElement = parentElement.querySelector(".received");

    listeningElement.setAttribute("style", "display:none;");
    receivedElement.setAttribute("style", "display:block;");

    console.log("Received Event: " + id);
  },
};

app.initialize();

// In this example the channel listener handles only two types of messages:
// - the 'Reply' object type that is defined in the www/nodejs-project/main.js
// - the string type
// But any other valid JavaScript type can be handled if desired.
function channelListener(msg) {
  if (typeof msg === "string") {
    console.log('[cordova] MESSAGE from Node: "' + msg + '"');
  } else if (typeof msg === "object") {
    console.log(
      '[cordova] MESSAGE from Node: "' +
        msg.reply +
        '" - In reply to: "' +
        msg.original +
        '"',
    );
  } else {
    console.log("[cordova] unexpected object type: " + typeof msg);
  }
}

// Events listener
function startedEventistener(msg) {
  if (msg) {
    if (typeof msg === "string") {
      console.log(
        '[cordova] "STARTED" event received from Node with a message: "' +
          msg +
          '"',
      );
    } else if (typeof msg === "object") {
      // Add your own logic there
    } else {
      console.log('[cordova] "unexpected object type: ' + typeof msg);
    }
  } else {
    console.log('[cordova] "STARTED" event received from Node');
  }
}

// This is the callback passed to 'nodejs.start()' to be notified if the Node.js
// engine has started successfully.
function startupCallback(err) {
  if (err) {
    console.log(err);
  } else {
    console.log("Node.js Mobile Engine started");
    // Send a message to the Node.js app. The reply from the Node.js app will be
    // processed by the message channel listener 'channelListener()`.
    nodejs.channel.send("Hello from Cordova!");

    // Send a sample event to the Node.js app.
    nodejs.channel.post("myevent", "An event from Cordova");
  }
}

// The entry point to start the Node.js app.
function startNodeProject() {
  // Register the callbacks for the message channel and for the events channel
  // before starting the Node.js engine.
  nodejs.channel.setListener(channelListener);
  nodejs.channel.on("started", startedEventistener);

  // As an alternative to 'nodejs.channel.setListener', the 'nodejs.channel.on'
  // method can be used:
  // nodejs.channel.on('message', channelListener);

  // Start the Node.js for Mobile Apps engine, passing the main script filename
  // and a callback to receive the result of the startup process.
  nodejs.start("main.js", startupCallback);
  // To disable the stdout/stderr redirection to the Android logcat:
  // nodejs.start('main.js', startupCallback, { redirectOutputToLogcat: false });
}