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Chapter 58 – Flask Paginate, Implement Paginations to List Products and Services in Search Result

Pagination to break down product and service search results by pages is a popular approach in web and mobile applications. In this piece, I’ll walk you through how to utilize flask paginate to implement paginations

Table of Contents: Flask Paginate, Implement Paginations to List Products and Services in Search Result

What’s Flask Paginate

Flask paginate is a simple pagination extension for flask which is used to show results in a limited number per page from tons of data. It uses bootstrap as a CSS framework and works with it perfectly to enhance user experience.

Results are paginated using the paginate function of Flask SQLAlchemy with any number of arguments as desired. The result of calling the paginate() function is a Pagination Object, which has many methods that can help you achieve your desired result

Installation and Module Import

Similar to other flask extensions, installing flask paginate is super easy. We can input this command into the computer terminal.

In the Python script, we need to import these three modules from the flask_paginate. I’ll use them with the explanation in a moment.

from flask_paginate import Pagination, get_page_args, get_page_parameter

Create the page source code parameter

When the configuration and deployment are done, we can start setting up the page source code parameter.

get_page_parameter()

Different from the API endpoint I walked through before, flask paginates itself has a method, get_page_parameter(), for developers to create a page parameter. Once the page variable is created, the application can automatically detect the page number and show the result. The default page number would be 1.

Set up results per page

Meanwhile, we need to create a per_page variable to define the limit number of each page. Here I set 20. Then, the offset number after page one needs to be set up as well. So here is the variable.

Offset = (page - 1 )* per_page

Manage what you like to show per page

This is the most critical component in the flask pagination because it connects with your database and shows what you want to display.

Basically, the purpose of the pagination aims to break down all your fetched data from the database and show it by pages. So we need to create a range of data to show working along with the page number.

1. Create the x and y variables standing for the starting and ending points of the data

2. Fetch all the data

3. Create a User variable used for the table parameter in a moment

Pagination Variable and Render_template

For returning the paginate page data, we need to create a variable by using the pagination method given by the flask paginate module.

In this method, there are several parameters and value-added on, they are listed below

Then, each request and response from the render_template needs to add the pagination variable and also the user created above.

Add Pagination Jinja Codes in the Specific HTML Script

By referring to the variables we used in the above render_template, we can use Jinja to sync them together.

First thing first, it’s the pagination that let users select which page they like to explore.

{{ pagination.links }}

Then, for the fetched data range in the specific page number, we can utilize the Jinjia loop and the table variable to show the relevant result on each paginated page.

Full Python Script of Flask Paginate Code Sample

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FAQ:

Q1: What is Flask Paginate?

A: Flask Paginate is a Python library used for pagination in Flask applications. It provides an easy way to split large result sets into smaller chunks, making it easier to navigate through pages of data.

Q2: How does Flask Paginate work?

A: Flask Paginate works by taking a query object or a list of items and dividing them into smaller subsets called pages. It calculates the total number of pages based on the number of items per page and provides the necessary information for navigation.

Q3: Why should I use Flask Paginate?

A: Flask Paginate simplifies the process of implementing pagination in Flask applications. It helps improve the user experience by breaking down large result sets into manageable pages, reducing load times and allowing users to easily navigate through the data.

Q4: Is Flask Paginate compatible with other Flask extensions?

A: Yes, Flask Paginate is designed to work seamlessly with other Flask extensions. It can be used alongside popular extensions like Flask-SQLAlchemy, Flask-Admin, and Flask-WTF to enhance pagination functionality in different parts of your application.

Q5: Can Flask Paginate handle large datasets efficiently?

A: Yes, Flask Paginate is optimized to handle large datasets efficiently. It uses a lazy loading approach, only fetching the necessary items for each page instead of loading the entire dataset into memory. This helps improve performance and reduces resource usage.

Q6: How can I customize the appearance of pagination links in Flask Paginate?

A: Flask Paginate provides customizable templates for pagination links. You can override the default templates to match your application’s design and styling preferences. By modifying the CSS classes and HTML structure, you can achieve the desired appearance.

Q7: Does Flask Paginate support AJAX-based pagination?

A: Yes, Flask Paginate supports AJAX-based pagination. It provides the necessary information for client-side pagination, allowing you to update the content dynamically without refreshing the entire page. This can enhance the user experience and improve performance.

Q8: Can Flask Paginate handle different types of data sources?

A: Yes, Flask Paginate can handle different types of data sources. Whether you are using a database query object, a list of items, or any other iterable, Flask Paginate can paginate the data and provide the necessary navigation links.

Q9: Is Flask Paginate compatible with both Flask versions 1.x and 2.x?

A: Yes, Flask Paginate is compatible with both Flask versions 1.x and 2.x. It is designed to work with the latest Flask releases and follows best practices and conventions of the Flask ecosystem.

Q10: Where can I find documentation and examples for Flask Paginate?

A: You can find the documentation and examples for Flask Paginate on the official Flask Paginate GitHub repository. The documentation provides detailed information on how to install, configure, and use Flask Paginate in your Flask applications.

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