CODEWITHSUNDEEP
javascriptbackbone.js
ahmedsaber111
ahmedsaber111

Reputation: 822

get data from server Backbone.js application

Update: I am updating the question with the answer of Sushanth --, I have faced some troubles prevent the code from run successfully [the latest update of my code in the question below after this quote "Latest Update" & the issues below it]

I am developing an Backbone.js application and I am stuck with getting data from the server. 

http://localhost:8888/client/i/schedule

This url represents json array of the required data, the problem here is how could i make the view read this data from the collections and model

There is 3 files below:

The first one is for the view

// Filename: views/schedule
define([
'jquery',
'underscore',
'backbone',
'collections/schedule',
'text!templates/schedule.html'
], function($, _, Backbone, scheduleCollection, scheduleTemplate) {

var scheduleView = Backbone.View.extend({

    el: $(".app"),
    initialize: function() {},

    render: function() {             
        console.log('schedule view loaded successfully');
    }
});
return new scheduleView;
});

The second one is for the collection

// Filename: collections/schedule
define([
  'jquery',
  'underscore',
  'backbone',
  'models/schedule'
], function($, _, Backbone, ScheduleModel){
  var ScheduleCollection = Backbone.Collection.extend({
    model: ScheduleModel,
    initialize: function(){
        console.log('schedule collections loaded successfully');
    }
  });
  return new ScheduleCollection;
});

the first one is for the model

// Filename: models/schedule
define([
  'underscore',
  'backbone',
  'config'
], function(_, Backbone, config) {
var ScheduleModel = Backbone.Model.extend({    
    urlRoot: "http://localhost:8888/client/i/schedule",    
    defaults: {
      feedback: 'N/A'
    },
    initialize: function(){
        console.log('schedule model loaded successfully');
    }
  });
  return ScheduleModel;

});

Update

The router

    var AppRouter = Backbone.Router.extend({
        routes: {
            // Define some URL routes
            'schedule': 'scheduleRoute',
            // Default
            '*actions': 'defaultRoute'
        },
        scheduleRoute: function() {

            scheduleView.render();
        },

)}

Latest Update

The router.js

define([
    'jquery',    
    'underscore',
    'backbone',
    'app/views/dashboard',
    'app/views/schedule'
], function($, _, Backbone, dashboardView, scheduleView) {
    var AppRouter = Backbone.Router.extend({
        routes: {
            // Define some URL routes
            'schedule': 'scheduleRoute',
            // Default
            '*actions': 'defaultRoute'
        },
        scheduleRoute: function() {
            // Create a new instance of the collection
            // You need to set the url in the collection as well to hit the server
            var schedules = new Schedules();
            // Pass in the collection as the view expects it
            var scheduleView = new ScheduleView({
                collection: schedules
            });
           // No need of calling render here
           // as the render is hooked up to the reset event on collection          
        },
        defaultRoute: function(actions) {            
            // We have no matching route, lets display the home page
            dashboardView.render();
        }
    });

    var initialize = function() {                
        var app_router = new AppRouter;
        Backbone.history.start();
    };
    return {
        initialize: initialize
    };
});

The schedule view .js

// Filename: views/schedule
define([
    'jquery',
    'underscore',
    'backbone',
    'app/collections/schedule',
    'text!templates/schedule.html'
], function ($, _, Backbone, scheduleCollection, scheduleTemplate) {

    var scheduleView = Backbone.View.extend({
        collection: scheduleCollection,
        el: $(".app"),
        initialize: function () {
            // Listen to the reset event which would call render
            this.listenTo(this.collection, 'reset', this.render);
            // Fetch the collection that will populate the collection
            // with the response 
            this.collection.fetch();
        },
        render: function () {
            console.log('schedule view loaded successfully');  
            console.log(this.collection);
        }
    });
    return new scheduleView;
});

The collection

// Filename: collections/schedule
define([
    'jquery',
    'underscore',
    'backbone',
    'app/models/schedule'
], function ($, _, Backbone, ScheduleModel) {
    var ScheduleCollection = Backbone.Collection.extend({
        model: ScheduleModel,
        url: "http://sam-client:8888/sam-client/i/schedule",
        initialize: function () {
            console.log('schedule collections loaded successfully');
        }
    });
    return ScheduleCollection;
});

The schedule Model

// Filename: models/schedule
define([
    'underscore',
    'backbone',
    'app/config'], function (_, Backbone, config) {
    var ScheduleModel = Backbone.Model.extend({
        // If you have any
        //idAttribute : 'someId'
        // You can leave this as is if you set the idAttribute
        // which would be apprnded directly to the url
        urlRoot: "http://sam-client:8888/sam-client/i/schedule",
        defaults: {
            feedback: 'N/A'
        },
        initialize: function () {
            console.log('schedule model loaded successfully');
        }
    });
    return ScheduleModel;

});

Issue code not run as expected and console log me the error below

Uncaught TypeError: Cannot read property '_listenerId' of undefined

Update the answer was that i miss to return a value from the ScheduleView.js

Backbone.js is not a constructor error when create instance of view

Upvotes: 1

Views: 2279

Answers (1)

Sushanth --
Sushanth --

Reputation: 55740

You would need to listen to the reset event on the collection for the view in question.

Then use fetch to send in the request. 

var scheduleView = Backbone.View.extend({

    el: $(".app"),
    initialize: function() {
       // Listen to the reset event which would call render
       this.listenTo(this.collection, 'reset', this.render);
       // Fetch the collection that will populate the collection
       // with the response 
       this.collection.fetch();
    },
    render: function() {             
        console.log('schedule view loaded successfully');
        console.log(this.collection)
    }
});

And to reduce the confusion return the Backbone View,Model or Collection instead of a new Instance from the module.

So when you define the module, you can create a new instance.

// Filename: views/schedule
define([
    'jquery',
    'underscore',
    'backbone',
    'collections/schedule',
    'text!templates/schedule.html'], function ($, _, Backbone, scheduleCollection, scheduleTemplate) {

    var scheduleView = Backbone.View.extend({

        el: $(".app"),
        initialize: function () {},

        render: function () {
            console.log('schedule view loaded successfully');
        }
    });
    return scheduleView;
    // Remove the returning of new module here
});

And in the module where you want to add the view as the dependency

// Create a new instance of the collection
// You need to set the url in the collection as well to hit the server
var schedules = new Schedules();

// Pass in the collection as the view expects it
var scheduleView = new ScheduleView({
    collection : 
})

UPDATE

model

// Filename: models/schedule
define([
    'underscore',
    'backbone',
    'config'], function (_, Backbone, config) {
    var ScheduleModel = Backbone.Model.extend({
        // If you have any
        //idAttribute : 'someId'
        // You can leave this as is if you set the idAttribute
        // which would be apprnded directly to the url
        urlRoot: "http://localhost:8888/client/i/schedule",
        defaults: {
            feedback: 'N/A'
        },
        initialize: function () {
            console.log('schedule model loaded successfully');
        }
    });
    return ScheduleModel;

});

collection

// Filename: collections/schedule
define([
    'jquery',
    'underscore',
    'backbone',
    'models/schedule'], function ($, _, Backbone, ScheduleModel) {
    var ScheduleCollection = Backbone.Collection.extend({
        model: ScheduleModel,
        url: "http://localhost:8888/client/i/schedule",
        initialize: function () {
            console.log('schedule collections loaded successfully');
        }
    });
    return ScheduleCollection;
});

view

// Filename: views/schedule
define([
    'jquery',
    'underscore',
    'backbone',
    'collections/schedule',
    'text!templates/schedule.html'], function ($, _, Backbone, scheduleCollection, scheduleTemplate) {

    var scheduleView = Backbone.View.extend({

        el: $(".app"),
        initialize: function () {
            // Listen to the reset event which would call render
            this.listenTo(this.collection, 'reset', this.render);
            // Fetch the collection that will populate the collection
            // with the response 
            this.collection.fetch();
        },
        render: function () {
            console.log('schedule view loaded successfully');
            console.log(this.collection)
        }
    });
});

In some other module,

you would require the the views, that you want to render

Router

var AppRouter = Backbone.Router.extend({
    routes: {
        // Define some URL routes
        'schedule': 'scheduleRoute',
        // Default
        '*actions': 'defaultRoute'
    },
    scheduleRoute: function () {
        // Create a new instance of the collection
        // You need to set the url in the collection as well to hit the server
        var schedules = new Schedules();
        // Pass in the collection as the view expects it
        var scheduleView = new ScheduleView({
            collection: schedules
        });
       // No need of calling render here
       // as the render is hooked up to the reset event on collection 
    }
});

Upvotes: 1

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