Tuesday, September 22, 2015

Create a Responsive Django website with REST Api's and Angular js

                       Using Angular JS with Django

What is Angular js and important ?

     AngularJS is a structural framework for dynamic web apps. It lets you use HTML as your template language and lets you extend HTML's syntax to express your application's components clearly and succinctly. Angular's data binding and dependency injection eliminate much of the code you currently have to write. And it all happens within the browser, making it an ideal partner with any server technology.

Advantage of AngularJs

  • AngularJS provides capability to create Single Page Application in a very clean and maintainable way.
  • AngularJS provides data binding capability to HTML thus giving user a rich and responsive experience
  • AngularJS code is unit testable.
  • AngularJS uses dependency injection and make use of separation of concerns.
  • AngularJS provides reusable components.
  • With AngularJS, developer write less code and get more functionality.
  • In AngularJS, views are pure html pages, and controllers written in JavaScript do the business processing.
  • On top of everything, AngularJS applications can run on all major browsers and smart phones including Android and iOS based phones/tablets
Disadvantage of Angular Js

Though AngularJS comes with lots of plus points but same time we should consider the following points −
  • Not Secure − Being JavaScript only framework, application written in AngularJS are not safe. Server side authentication and authorization is must to keep an application secure.
  • Not degradable − If your application user disables JavaScript then user will just see the basic page and nothing more.
Angular Js Components 

The AngularJS framework can be divided into following three major parts −
  • ng-app − This directive defines and links an AngularJS application to HTML.
  • ng-model − This directive binds the values of AngularJS application data to HTML input controls.
  • ng-bind − This directive binds the AngularJS Application data to HTML tags.
Integration with Django 
       When  try angular js with Django i feel very hard to learn , but when it started it going awesome coding , i create a dynamic responsive website its working fine in all browser and mobile .
create a project and create app , if you face any issues please go through with the django official documents 
django projects
 set the settings.py properly 
Here iam using django-tastypie for Rest framework , you need to install this package inside the settings.py and make sure the collectstatic and migrate , if you face any issues please go through with django-tastypie doc 
example code,

Having read posts on the subject of using Django and Angular together, I felt most were reinventing the wheel, so to speak. Although the example code I have given is crude it should highlight how I've been using them on projects.
Lets start with a typical Model.


class Job(models.Model):
     name = models.CharField(max_length=50)
     description = models.TextField(null=True, blank=True)
Alright, nothing special so far. All you have done is create a simple model to contain basic job details.

The REST API ( Tastypie )

AngularJS is built to consume webservices, so your gonna need a way to expose the Job Model you just created.
Django has a good set of choices to create RESTful APIs. TastyPie is an awesome webservice framework built for the Django framework. It's incredibly powerful, yet easy to setup and use. However, personal preference aside, the same results could be achieved using Django REST framework, or even constructing your own API responses directly using Django. The choice is entirely yours. For the purposes of this tutorial we'll be using TastyPie.
If you're not familiar with TastyPie head over to the documentation. I won't go into detail regarding installation. One will assume you've setup and added TastyPie to your installed applications and are ready to go.
First, you need to create a resource for your Jobs. TastyPie uses the concept of 'Resources'. It describes them as intermediaries between the end user and objects, in this case thats the Job Model.
Start by creating the appropriate resource for the Job Model:

 class JobResource(ModelResource):
     API Facet
     class Meta:
         queryset = Jobs.objects.all()
         resource_name = 'job'
         allowed_methods = ['post', 'get', 'patch', 'delete']
         authentication = Authentication()
         authorization = Authorization()
         always_return_data = True
From memory, TastyPies documentation suggests naming the file api.py within your application. This is also my preference, but it's not mandatory.You can name the Python file whatever you like, but it's nice to keep consistency.
There are a few things going on in JobResource which is beyond the scope of this tutorial. But, I would just like to draw attention to how JobResource inherits 'ModelResource'. You want to use Tastypie with Django's ORM (the Job Model). Extending this means that many of the API fundamentals are all handled for you.
TastyPie can handle non-ORM data too. By extending directly from Resource you can also get all the API goodies TastyPie has to offer, but without being tied to the ORM. This is particularly useful when making calls to a non ORM, No SQL database as described in the documentation.
So far you have created the Model (Job) and a way for the end user to interface with it. Next, you need a way to connect the resource to an actual URL that will eventually allow AngularJS to consume it. You do this in Django by hooking it up to the URLconf. Simply instantiate the resource in your Django URLconf then hook up the URL's:

 from tastypie.api import Api
 from .apps.your_app.api import JobResource
 v1_api = Api(api_name='v1')
 urlpatterns = patterns('',
      (r'^api/', include(v1_api.urls)),
The 'resource_name' attribute specified in the JobResource is the end point of the url. With that you now have a working API with the Resource endpoint Job. Check it’s all working by running your local server, then visiting in your browser.
You now have a working API for your Job model. Easy.
Before you begin diving into AngularJS we are going to need to create a Job Form using Django's framework. The Job form will later allow you to edit Jobs in the single page application. I know what you're thinking, "why in Django"?
One of Django's design philosophies is "Don’t repeat yourself (DRY)". So it doesn't make sense to build forms using HTML for AngularJS and then in Django too, besides Django does such a good job as this. You may also already have several forms you want to convert, so why repeat the process? Enter, django-angular. This is one cool package you will be glad you came across (I know I was).
Quote: "Django-Angular is a collection of utilities, which aim to ease the integration of Django with AngularJS by providing reusable components."
Again, I'm not going to go into any details regarding the setup and installation here. I suggest you head over and check Django-Angular right away! Suffice to say, one of its many ticks it to allow you to use Django forms thus its form validation within AngularJS. Combine this with a package such as 'crispy forms' and you have a powerful all-in-one solution - "this is why I love the Django framework and its community".

 from .app.your_app.models import Job
 from .apps.djangular.forms import NgFormValidationMixin, NgModelFormMixin, AddPlaceholderFormMixin
 class JobForm(NgModelFormMixin, forms.ModelForm):
     Job Form with a little crispy forms added! 
     def __init__(self, *args, **kwargs):
         super(JobForm, self).__init__(*args, **kwargs)
     class Meta:
         model = Job
         fields = ('name', 'description',)
 def setup_bootstrap_helpers(object):
     object.helper = FormHelper()
     object.helper.form_class = 'form-horizontal'
     object.helper.label_class = 'col-lg-3'
     object.helper.field_class = 'col-lg-8'
On to Angular js
For simplicity you're going to create 3 new templates using the following structure:
 This assumes you have a Job app setup and installed. Your base template will look something like this:

 <!DOCTYPE html>
     <meta charset="utf-8">
     <link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.2/css/bootstrap.min.css" rel="stylesheet">
     <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.7/angular.js"></script>
     <script src="/angular-ui-router.min.js"></script>
     <script type="text/javascript" src="http://cdn.jsdelivr.net/restangular/latest/restangular.js"></script>
    {% block content %}{% endblock content %}
    {% block extra_javascript %}{% endblock extra_javascript %}
Django-Angular does offer some nice template tags which will include the necessary javascript for you. I recommend using a content distribution network (CDN) to load the necessary files where possible. Doing so gives obvious geographically and bandwidth advantages.
From here you need to create a signal page template that will be served by our Django project. The index.html will serve as the main page for our single page application and later can be used to serve all your CRUD views for Jobs.

{% extends "base.html" %}
 {% load i18n %}
 {% block content %}
 <div class="container content" ng-app="JobApp">
     <div ui-view >Loading...</div>
 {% endblock content %}
 {% block extra_javascript %}
 <script src="{{ STATIC_URL }}/javascript/app.js"></script>
 {% endblock extra_javascript %}

var app = angular.module('JobApp', [
 app.config(function ($stateProvider, $urlRouterProvider, RestangularProvider) {
     // For any unmatched url, send to /route1
         .state('index', {
             url: "/",
             templateUrl: "/static/html/partials/_job_list.html",
             controller: "JobList"
        .state('new', {
             url: "/new",
             templateUrl: "/jobs/job-form",
             controller: "JobFormCtrl"
 app.controller("JobFormCtrl", ['$scope', 'Restangular', 'CbgenRestangular', '$q',
 function ($scope, Restangular, CbgenRestangular, $q) {
 }])// end controller
The template and js above is very simple, inheriting from the base template. There are a few attributes you may-not have seen before and will need to understand.
The first of which is ng-app='JobApp'. Without this tag, the AngularJS process does not start. This directive tells AngularJS which element is the root element of the application. Anything you add inside this element will be part of the template managed by AngularJS.
Next, look at the script you have included in the index.html. This app.js script defines the angular module. An Angular module is a collection of functions that are run when the application is 'booted'.

 var app = angular.module('JobApp', [
This above line creates the module called 'JobApp'. In the index.html you already instantiated this using the ng-app='JobApp' attribute. What you have basically done here is tell AngularJS you want app.js to own everything inside.
Infact, you could set ng-app on any element in the DOM. For example, if you didn't want a part of the template controlled by Angular you could do this:

 <h2>I am not inside an AngularJS app</h2>
 <div ng-app="embeddedApp">
   <h3>Inside an AngularJS app</h3>
app.config in app.js also shows the beginnings of your URL routing. AngularJS supplies URL routing by default via $route service in Angular core, but it's inadequate, and has some limitations.
One of the modules you have included is AngularUI Router 'ui.router'. AngularUI Router is an another routing framework for AngularJS which is organised around states, which may optionally have routes, as well as other behaviour, attached.
You have provided just one state in this tutorial called 'new', but you could include lots of different states for you application and hopefully you're having a lightbulb moment right now. You can even add a default behaviour for when no state is detected:

         .state('index', {
             url: "/",
             templateUrl: "static/html/somepage.html",
             controller: "SomeController"
If unfamiliar with this then I suggest reading up on AngularUI Router when you have completed this tutorial.
The last element within index.html you should understand is 'ui-view'. This is part of AngularUI Router model too. The ui-view directive tells $state where to place your template ie. templateUrl: "/job/new/".
Final template you will be creating is /jobs/new.html. This will hold the basic form you created earlier using the Django-Angular.

 {% load crispy_forms_tags %}
 {% crispy JobForm %}
 <button type="button" class="btn btn-default"  ng-click="submitJob()">Create</button>
Now you just need the view and URL to connect up the form.

 from .forms import JobForm
 class JobFormView(TemplateView):
     template_name = "jobs/new.html"
     def get_context_data(self, **kwargs):
         context = super(JobFormView, self).get_context_data(**kwargs)
         return context

 from django.conf.urls import url
 from django.conf.urls import patterns
 from .views import JobFormView
 urlpatterns = patterns('',
Now in your browser navigate to and you should see the job form in your new single page application.
Our last step is to post our form data when submitJob is clicked. You are going to change the controller, the example below will use restangular.
app.controller("JobFormCtrl", ['$scope', 'Restangular', 'CbgenRestangular', '$q',
 function ($scope, Restangular, CbgenRestangular, $q) {
    $scope.submitJob = function () {
       var post_update_data = create_resource($scope, CbgenRestangular);
                         function (object) {
                             // success!
                         function (object){
                             // error!
 }])// end controller
 app.factory('CbgenRestangular', function (Restangular) {
         return Restangular.withConfig(function (RestangularConfigurer) {
 populate_scope_values = function ($scope) {
     return {name: $scope.name, description: $scope.description };
 create_resource = function ($scope, CbgenRestangular) {
 var post_data = populate_scope_values($scope)
     return CbgenRestangular.all('job').post(post_data)


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    Angularjs Developer


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