Book Image

Django Essentials

By : Samuel Dauzon
Book Image

Django Essentials

By: Samuel Dauzon

Overview of this book

<p>Django is a powerful Python web framework designed for rapid web application development. With the advent of frameworks such as Django, web developers have been forced to adopt MVC architectures and are encouraged to develop quality code. This quality allows several developers to work together easily and reduces the number of bugs due to human errors.</p> <p>Beginning with the basics of the Web and Django, the book explains the MVC pattern. It then moves on to explain the step-by-step installation of Python, PIP, and Django on Windows, Linux, and Mac OS. Furthermore, you will learn how to create templates, models, forms, and so on. After reading the book, you will be able to quickly create dynamic web applications with AJAX and an admin part.</p> <p>This book features a step-by-step approach that shows you how to program, create, and improve the quality of web applications using Django, with the help of Python.</p>

Related Content you might be interested in

Current Title:

Small book image
Django Essentials
Samuel Dauzon
Jun, 2014 | 172 pages
No titles found
Table of Contents (20 chapters)
Django Essentials
Django Essentials
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Django's Position on the Web
Django's Position on the Web
From Web 1.0 to Web 2.0
What is Django?
The MVC framework
Why use Django?
Summary
2
Creating a Django Project
Creating a Django Project
Installing Python 3
Installing setuptools
Installing PIP
Installing Django
Starting your project with Django
Creating an application
Configuring the application
Summary
3
Hello World! with Django
Hello World! with Django
Routing in Django
Regular expressions
Creating our first URL
Creating our first view
Testing our application
Summary
4
Working with Templates
Working with Templates
Displaying Hello world! in a template
Injecting the data from the view to the template
Creating dynamic templates
Integrating variables in templates
Using filters
Creating DRY URLs
Extending the templates
Using static files in templates
Summary
5
Working with Models
Working with Models
Databases and Django
Migrations with South
Creating simple models
The relationship between the models
Extending models
The admin module
Advanced usage of models
Summary
6
Getting a Model's Data with Querysets
Getting a Model's Data with Querysets
The persisting model's data on the database
Getting data from the database
Using the get parameter
Saving the foreign key
Updating records in the database
Deleting a record
Getting linked records
Advanced usage of the queryset
Summary
7
Working with Django Forms
Working with Django Forms
Adding a developer without using Django forms
Adding a developer with Django forms
The form based on a model
Advanced usage of Django forms
Summary
8
Raising Your Productivity with CBV
Raising Your Productivity with CBV
The CreateView CBV
Working with ListView
The DetailView CBV
The UpdateView CBV
The DeleteView CBV
Going further by extending the CBV
Summary
9
Using Sessions
Using Sessions
Creating and getting session variables
About session security
Summary
10
The Authentication Module
The Authentication Module
How to use the authentication module
Adding a user
Login and logout pages
Restricting access to the connected members
Summary
11
Using AJAX with Django
Using AJAX with Django
Working with jQuery
jQuery basics
Working with AJAX in the task manager
Summary
12
Production with Django
Production with Django
Completing the development
Selecting the physical server
Selecting the server software
Selecting the server database
Deploying the Django website
Installing Django, South, Gunicorn, and psycopg2
Summary
Cheatsheet
Cheatsheet
The field types in models
The form fields
The template language
Index
Index

The form fields

It is possible to use all types of field models in the forms. Indeed, some types of model fields have been created for a particular use in forms. For example, the TextField model field has nothing different from CharField except the fact that by default, in the form, the TextField field displays a <textarea> tag and a <input type="text"> name. So, you can write a form field as follows:

field1 = forms.TextField()

Common options for the form fields

The following options are common to all the form fields:

  • error_messages: This specifies a series of error messages

  • help_text: This sets a help message

  • required: This defines a field that must be filled

  • initial: This sets the default value for the field

  • validators: This defines a particular validator that validates the field value

  • widget: This defines a specific widget for the field

The widget form

Widgets allow you to define HTML code that renders form fields. We'll explain what widgets can generate as HTML code, as follows:

  • TextInput: This corresponds to <input type="text" />

  • Textarea: This corresponds to <textarea></textarea>

  • PasswordInput: This corresponds to <input type="password" />

  • RadioSelect: This corresponds to <input type="radio" />

  • Select: This corresponds to <select><option></option></select>

  • CheckboxInput: This corresponds to <input type="checkbox" />

  • FileInput: This corresponds to <input type="file" />

  • HiddenInput: This corresponds to <input type="hidden" />

Error messages (forms and models)

The following is a partial list of the error messages that can be set when form fields are entered incorrectly:

  • required: This message is displayed when the user does not fill data in the field

  • min_length: This message is displayed when the user has not supplied enough data

  • max_length: This message is displayed when the user has exceeded the size limit of a field

  • min_value: This message is displayed when the value entered by the user is too low

  • max_value: This message is displayed when the value entered by the user is too high

Previous Section
End of Section
Next Section