Django Tag

What will be the best Back End development framework for 2021

What should we learn next? If you are a developer, this question should always be in your mind. Every day, new technologies are introduced and improvements are made to existing ones. Since we can’t learn all these technologies, it is really important to decide what should we learn next.

In this article, we’re going to discuss three back end development frameworks based on three different programming languages to give you an insight into what you should learn in 2021.

Node.js

Pic courtesy: medium.com; Source: nodejs.org

NodeJS is a JavaScript runtime environment framework that can be used for cross-platform development purposes. Since JavaScript is one of the most popular languages in the current context, that popularity has lifted up NodeJS to be one of the most used back end frameworks as well. Apart from that, NodeJS brings many important features that attract developers.

• NodeJS never waits until an API returns data since it’s asynchronous. NodeJS will move onto the next API request without waiting for the response of the previous one and the notification mechanism of Events of NodeJS takes the responsibility for delivering the response to the server correctly. Hence, NodeJS is known as asynchronous and event-driven.
• Fast code execution.
• No buffer.
• Although NodeJS is single-threaded, high scalability enables it to handle a large number of requests.

NodeJS is used by some famous companies all around the world including eBay, General Electric, GoDaddy, Microsoft, PayPal, Uber, Wikipins. Node JS is a perfect match if you’re building I/O bound applications, data streaming applications, Data Intensive Real-time Applications (DIRT), JSON APIs based applications, or single-page applications.

Advantages

• Based on JavaScript, which is well known to everyone.
• Easy learning curve and large community.
• Contains an excellent package manager.
• Library support.
• Quick and easy handling of concurrent requests.
• Simple and scalable.
• Well established.

Disadvantages

• Some developers may have difficulties working with asynchronous requests.
• Nested callbacks.

Django

Pic courtesy: medium.com; Source: .djangoproject.com

Django is an open-source, high-level web application framework written in Python. Django was introduced in 2005, and its idea of using Python for web development was a huge revolution. Django follows the model-template-view architecture and the main focus of this framework is to provide an easy method for the development of complex websites. Instagram, Mozilla, Bitbucket are some leading companies that use Django as their framework.

Advantages

• Rapid Development. One of the main intentions of Django was to reduce the development time of an application.
• Django helps to avoid much common security falls like SQL injection, cross-site scripting, cross-site request forgery, etc.
• Scalability.
• Supports a large set of libraries and helping modules.
• You don’t have to worry much about user authentication and content administration since Django takes care of them for you.

Disadvantages

• Many developers do not have expert knowledge in Python compared to JavaScript.
• Although Django is scalable, there can be issues with small scale applications.
• Monolithic framework.
• Django can’t handle multiple requests simultaneously.

Laravel

Pic courtesy: medium.com; Source: laravel.com

PHP is another famous language among web developers and Laravel is based on PHP. Laravel follows model-view-control architecture and is robust and easy to understand. Laravel is known as a good starting point for young developers. It provides a large set of features, like flexible routing for easy scaling, configuration management to handle different environments, query builders and ORM to query databases, Schema Builder to maintain database definitions and schemas, lightweight templates, etc. 9GAG, MasterCard, Kmong are some famous companies that use Laravel in their products.

Advantages

• High Security.
• MVC Based.
  Uses blade template engine.
• Built-in authorization and authentication systems.
• Supports test automation.

Disadvantages

• Less inbuilt support when compared to Django and NodeJs since Laravel is lightweight.
• Community support is minimized compared to other platforms.
• Converting legacy systems to Laravel is difficult.
• Updating from an older version to a new one may break your application.
• Full-page reloads can be a bit heavy in mobile apps when compared to websites.

NodeJs vs Django vs Laravel

Pic courtesy: medium.com

As you can see, all these three frameworks are very popular among developers and they tend to select the framework based on their preferred language most of the time. For example, If you’re good with JavaScript, you will surely go with NodeJS. But there are other aspects we should take into account when selecting a framework.

If you’re a novice developer, who doesn’t have knowledge about JavaScript, Python, or PHP, Django or Python will be a good option for you to start with. Since Python is very straightforward and simple in its syntax, you can easily understand it. So, we will rank Django at the top when it comes to the learning curve while Laravel and NodeJS come next.

Security is another measurement we need to address in any project and all these frameworks provide built-in features to make a developer’s life easy. Out of these three, Django claims first place here as well.

If we talk about scalability and performance Django can be recognized as the best framework in scalability aspects while NodeJS provides the best performance.

All these frameworks have large communities and good documentation to get started with and they’re well established. So don’t hesitate to select them for your projects.

For more information and to develop web application using NodeJS, Hire Back End Developer from us as we give you a high-quality product by utilizing all the latest tools and advanced technology. E-mail us any clock at – hello@hkinfosoft.com or Skype us: “hkinfosoft”. To develop custom web apps using NodeJS, please visit our technology page.

Content Source:

1. medium.com

Creating Dynamic Forms with Django

What is a dynamic form and why would you want one?

Usually, you know what a form is going to look like when you build it. You know how many fields it has, what types they are, and how they’re going to be laid out on the page. Most forms you create in a web app are fixed and static, except for the data within the fields.

A dynamic form doesn’t always have a fixed number of fields and you don’t know them when you build the form. The user might be adding multiple lines to a form, or even multiple complex parts like a series of dates for an event. These are forms that need to change the number of fields they have at runtime, and they’re harder to build. But the process of making them can be pretty straightforward if you use Django’s form system properly.

Django does have a formsets feature to handle multiple forms combined on one page, but that isn’t always a great match and they can be difficult to use at times. We’re going to look at a more straightforward approach here.

Creating a dynamic form

For our examples, we’re going to let the user create a profile including a number of interests listed. They can add any number of interests, and we’ll make sure they don’t repeat themselves by verifying there are no duplicates. They’ll be able to add new ones, remove old ones, and rename the interests they’ve already added to tell other users of the site about themselves.

Start with the basic static profile form.

class Profile(models.Model):
    first_name = models.CharField()
    last_name = models.CharField()
    interest = models.CharField()

class ProfileForm(forms.ModelForm):
    first_name = forms.CharField(required=True)
    last_name = forms.CharField(required=True)
    interest = forms.CharField(required=True)

class Meta:
    model = Profile

Create a fixed number of interest fields for the user to enter.

class Profile(models.Model):
    first_name = forms.CharField()
    last_name = forms.CharField()

class ProfileInterest(models.Model):
    profile = models.ForeignKey(Profile)
    interest = models.CharField()

class ProfileForm(forms.ModelForm):
    first_name = forms.CharField(required=True)
    last_name = forms.CharField(required=True)
    interest_0 = forms.CharField(required=True)
    interest_1 = forms.CharField(required=True)
    interest_2 = forms.CharField(required=True)

    def save(self):
        Profile = self.instance
        Profile.first_name = self.cleaned_data[“first_name”]
        Profile.last_name = self.cleaned_data[“last_name”]

        profile.interest_set.all().delete()
        For i in range(3):
           interest = self.cleaned_data[“interest_{}”.format(i]
           ProfileInterest.objects.create(
               profile=profile, interest=interest)

But since our model can handle any number of interests, we want our form to do so as well.

class ProfileForm(forms.ModelForm):
    first_name = forms.CharField(required=True)
    last_name = forms.CharField(required=True)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        interests = ProfileInterest.objects.filter(
            profile=self.instance
        )
        for i in range(len(interests) + 1):
            field_name = 'interest_%s' % (i,)
            self.fields[field_name] = forms.CharField(required=False)
            try:
                self.initial[field_name] = interests[i].interest
            Except IndexError:
                self.initial[field_name] = “”
        field_name = 'interest_%s' % (i + 1,)
        self.fields[field_name] = forms.CharField(required=False)
        self.fields[field_name] = “”

    def clean(self):
        interests = set()
        i = 0
        field_name = 'interest_%s' % (i,)
        while self.cleaned_data.get(field_name):
           interest = self.cleaned_data[field_name]
           if interest in interests:
               self.add_error(field_name, 'Duplicate')
           else:
               interests.add(interest)
           i += 1
           field_name = 'interest_%s' % (i,)
       self.cleaned_data[“interests”] = interests

    def save(self):
        profile = self.instance
        profile.first_name = self.cleaned_data[“first_name”]
        profile.last_name = self.cleaned_data[“last_name”]

        profile.interest_set.all().delete()
        for interest in self.cleaned_data[“interests”]:
           ProfileInterest.objects.create(
               profile=profile,
               interest=interest,
           )

Rendering the dynamic fields together

You won’t know how many fields you have when rendering your template now. So how do you render a dynamic form?

def get_interest_fields(self):
    for field_name in self.fields:
        if field_name.startswith('interest_'):
            yield self[field_name]

The last line is the most important. Looking up the field by name on the form object itself (using bracket syntax) will give you bound form fields, which you need to render the fields associated with the form and any current data.

{% for interest_field in form.get_interest_fields %}
    {{ interest_field }}
{% endfor %}

Reducing round trips to the server

It’s great that the user can add any number of interests to their profile now, but kind of tedious that we make them save the form for every one they add. We can improve the form in a final step by making it as dynamic on the client-side as our server-side.

We can also let the user enter many more entries at one time. We can remove the inputs from entries they’re deleting, too. Both changes make this form much easier to use on top of the existing functionality.

Adding fields on the fly

To add fields spontaneously, clone the current field when it gets used, appending a new one to the end of your list of inputs.

$('.interest-list-new').on('input', function() {
    let $this = $(this)
    let $clone = $this.clone()

You’ll need to increment the numbering in the name, so the new field has the next correct number in the list of inputs.

    let name = $clone.attr('name')
    let n = parseInt(name.split('_')[1]) + 1
    name = 'interest_' + n

The cloned field needs to be cleared and renamed, and the event listeners for this whole behavior rewired to the clone instead of the original last field in the list.

$clone.val('')
    $clone.attr('name', name)
    $clone.appendTo($this.parent())
    $this.removeclass('interest-list-new')
    $this.off('input', arguments.callee)
    $clone.on('input', arguments.callee)
})

Removing fields on the fly

Simply hide empty fields when the user leaves them, so they still submit but don’t show to the user. On submit, handle them the same but only use those which were initially filled.

$form.find(“input[name^=interest_]:not(.interest-list-new)”)
    .on(“blur”, function() {
        var value = $(this).val();
        if (value === “”) {
            $(this).hide();
        }
    })

Why dynamic forms matter

An unsatisfying user experience that takes up valuable time may convince users to leave your site and go somewhere else. Using dynamic forms can be a great way to improve user experiences through response time to keep your users engaged.

For more Information and to build website/System using Python, Hire Python Developer from us as we give you high quality product by utilizing all the latest tools and advanced technology. E-mail us any clock at – hello@hkinfosoft.com or Skype us: “hkinfosoft“.

To develop custom web app using Python, please visit our technology page.