This function takes the request object, the template path, and the context variables to render the given template. The render shortcut takes the request context into account, so any variable set by the template context processors is accessible by the given template. Template context processors are just callables that set variables into the context. Let's create a second view to display a single post. Add the following function to the views. This is the post detail view.
This view takes the year , month , day , and post arguments to retrieve a published post with the given slug and date. This ensures that there will be only one post with a slug for a given date, and thus, you can retrieve single posts using the date and slug. This function retrieves the object that matches the given parameters or an HTTP not found exception if no object is found. Finally, you use the render shortcut to render the retrieved post using a template.
A URL pattern is composed of a string pattern, a view, and, optionally, a name that allows you to name the URL project-wide. Then, Django imports the view of the matching URL pattern and executes it, passing an instance of the HttpRequest class and the keyword or positional arguments.
Create a urls. This allows you to organize URLs by application and use the name when referring to them. You define two different patterns using the path function. You use angle brackets to capture the values from the URL. Creating a urls. Edit the urls. You include these patterns under the namespace blog. Namespaces have to be unique across your entire project. You may have different pages in your site where you display posts, but there is a single URL that you use as the main URL for a blog post.
For this method, you will use the reverse method, which allows you to build URLs by their name and pass optional parameters. You have created views and URL patterns for the blog application. Templates define how the data is displayed; they are usually written in HTML in combination with the Django template language. Let's add templates to your application to display posts in a user-friendly manner. Create the following directories and files inside your blog application directory:.
The preceding structure will be the file structure for your templates. The base. The list. Django has a powerful template language that allows you to specify how data is displayed. It is based on template tags , template variables , and template filters :. Edit the base. With this template tag, you can include the static files, such as the blog. These tell Django that you want to define a block in that area.
Templates that inherit from this template can fill in the blocks with content. You have defined a block called title and a block called content. Then, you fill the title and content blocks of the base template with content. You iterate through the posts and display their title, date, author, and body, including a link in the title to the canonical URL of the post.
In the body of the post, you apply two template filters: truncatewords truncates the value to the number of words specified, and linebreaks converts the output into HTML line breaks. You can concatenate as many template filters as you wish; each one will be applied to the output generated by the preceding one.
Open the shell and execute the python manage. Note that you need to have some posts with the Published status to show them here. You should see something like this:. Next, you can return to your browser and click on one of the post titles to take a look at the detail view of the post. When you start adding content to your blog, you might easily reach the point where tens or hundreds of posts are stored in your database.
Instead of displaying all the posts on a single page, you may want to split the list of posts across several pages. This can be achieved through pagination. You can define the number of posts you want to be displayed per page and retrieve the posts that correspond to the page requested by the user. Django has a built-in pagination class that allows you to manage paginated data easily.
Now you have to create a template to display the paginator so that it can be included in any template that uses pagination. Add the following HTML code to the file:. The pagination template expects a Page object in order to render the previous and next links, and to display the current page and total pages of results. Since the Page object you are passing to the template is called posts , you include the pagination template in the post list template, passing the parameters to render it correctly.
You can follow this method to reuse your pagination template in the paginated views of different models. You should see the pagination at the bottom of the post list and should be able to navigate through pages:. Class-based views are an alternative way to implement views as Python objects instead of functions. Since a view is a callable that takes a web request and returns a web response, you can also define your views as class methods. Django provides base view classes for this.
All of them inherit from the View class, which handles HTTP method dispatching and other common functionalities. Class-based views offer advantages over function-based views for some use cases.
They have the following features:. This base view allows you to list objects of any kind. In the preceding code, you are telling ListView to do the following things:. Now open the urls. In order to keep pagination working, you have to use the right page object that is passed to the template. This is a simple example of a class-based view that uses a generic class provided by Django.
You will learn more about class-based views in Chapter 10 , Building an E-Learning Platform , and successive chapters. In this chapter, you learned the basics of the Django web framework by creating a simple blog application. You designed the data models and applied migrations to your project. You also created the views, templates, and URLs for your blog, including object pagination.
In the next chapter, you will discover how to enhance your blog application with a comment system and tagging functionality, and how to allow your users to share posts by email. Antonio has been developing Django projects since for clients across several industries.
In , he founded Zenx IT, a development company specializing in building digital products. Antonio has worked as a CTO and technology consultant for multiple technology-based start-ups and managed development teams building projects for large digital businesses.
Antonio holds an MSc. His father inspired his passion for computers and programming. Practical recipes for building fast, robust, and secure web apps using Django 3 and Python. Cut through the noise and get real results with a step-by-step approach to learning Python 3.
X programming. About this book If you want to learn the entire process of developing professional web applications with Python and Django, then this book is for you. By the end of this book, you will have mastered Django 3 by building advanced web applications. Publication date: March Publisher Packt. Pages ISBN Download code from GitHub.
Building a Blog Application Django is a powerful Python web framework with a relatively shallow learning curve. This chapter will cover the following topics: Installing Django Creating and configuring a Django project Creating a Django application Designing models and generating model migrations Creating an administration site for your models Working with QuerySets and managers Building views, templates, and URLs Adding pagination to list views Using Django's class-based views.
Installing Django If you have already installed Django, you can skip this section and jump directly to the Creating your first project section. I did it with Ajax success and I am always sending response As long as you return response , success in Ajax can work with it, you can check if file actually exist or not as the line below in this case would be false and you can inform user about that:. But I am referring to a page that must first be processed and then downloaded.
I know browsers block multiple file downloads, and I also have API which returns a set of csv formatted data. If anyone can help me improve this that would be great, but it's working for me so far. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow.
Learn more. Handle file download from ajax post Ask Question. Asked 8 years, 7 months ago. Active 1 year, 1 month ago. Viewed k times. Pavle Predic Pavle Predic 5, 3 3 gold badges 15 15 silver badges 16 16 bronze badges. For those who read this article, read this post: stackoverflow. Add a comment. Active Oldest Votes. URL window.
Jonathan Amend Jonathan Amend I don't want to navigate away from the page. I want to perform the request in the background, process the response and present it to the client. If the server sends back headers like the other answer has, it opens in a new window - I've done it before. It would only navigate away if your server-side script returned HTML code — user PavlePredic did you end up figuring out how to manage both response scenarios, i.
JSON text response or download file response? Answer is not clear and the proposed solution doesn't work. Show 5 more comments. I faced the same issue and successfully solved it. My use-case is this. After fetching content as a blob binary , we are creating a downloadable URL and attaching it to invisible "a" link then clicking it.
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Hi, do I need to have jQuery 3. I'm also getting a blank pdf with both examples you gave. I am trying to get it to download a pdf file. Should work fine with all versions.
Any errors on console might help to debug — Mayur Padshala. This worked for me using download. Tim Hettler Tim Hettler 1, 9 9 silver badges 12 12 bronze badges. There is a reserved field Notification. Feb 21, Jul 8, May 27, Jun 26, Jun 17, Mar 29, Jan 4, Dec 14, Oct 20, Apr 21, May 7, Mar 6, Oct 25, Download the file for your platform.
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