how to implement observer pattern in javascript?

Question

Hi I\'m tyring to implement observer pattern in JavaScript:

My index.js:

$(document).ready(function () {
  var ironMan = new Movie();
           


        

Answer 1

Here's an implementation of the Observer pattern in JavaScript that provides an API very similar to Backbone Models. This implementation avoids use of "this" and "new", as suggested by Douglas Crockford.

// The constructor function.
function Model(){

  // An object containing callback functions.
  //  * Keys are property names
  //  * Values are arrays of callback functions
  var callbacks = {},

      // An object containing property values.
      //  * Keys are property names
      //  * Values are values set on the model
      values = {};

  // Return the public Model API,
  // using the revealing module pattern.
  return {

    // Gets a value from the model.
    get: function(key){
      return values[key];
    },

    // Sets a value on the model and
    // invokes callbacks added for the property,
    // passing the new value into the callback.
    set: function(key, value){
      values[key] = value;
      if(callbacks[key]){
        callbacks[key].forEach(function (callback) {
          callback(value);
        });
      }
    },

    // Adds a callback that will listen for changes
    // to the specified property.
    on: function(key, callbackToAdd){
      if(!callbacks[key]){
        callbacks[key] = [];
      }
      callbacks[key].push(callbackToAdd);
    },

    // Removes a callback that listening for changes
    // to the specified property.
    off: function(key, callbackToRemove){
      if(callbacks[key]){
        callbacks[key] = callbacks[key].filter(function (callback) {
          return callback !== callbackToRemove;
        });
      }
    }
  };
}

Here's some example code that uses Model:

// Create a new model.
var model = Model();

// Create callbacks for X and Y properties.
function listenX(x){
  // The new value is passed to the callback.
  console.log('x changed to ' + x);
}

function listenY(y){
  // The new value can be extracted from the model.
  console.log('y changed to ' + model.get('y'));
}

// Add callbacks as observers to the model.
model.on('x', listenX);
model.on('y', listenY);

// Set values of X and Y.
model.set('x', 30); // prints "x changed to 30"
model.set('y', 40); // prints "y changed to 40"

// Remove one listener.
model.off('x', listenX);
model.set('x', 360); // prints nothing
model.set('y', 50); // prints "y changed to 40"