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Posted on Aug 4, 2020 • Edited on Nov 22

Jinja Template - Black Dashboard

#webdev #jinja2 #blackdashboard #appseed

Hello Coders,

This article presents a free Flask/Jinja Template generated by the AppSeed platform using Black Dashboard design, crafted by Creative-Tim, as input.
The project is a lightweight Flask app (no database or hard dependencies) that can be used for production-ready Python projects like Django/Flask dashboards.

Thanks for reading! - Content provided by App Generator.

Flask/Jinja Black Dashboard - product page
Django Black Dashboard - product page

What is Jinja

Jinja is a Python template engine used to generate HTML or XML returned to the user via an HTTP response.

For those who have not been exposed to a templating language before, such languages essentially contain variables as well as some programming logic, which when evaluated (or rendered into HTML) are replaced with actual values.

Why do we need Jinja?

Sandboxed Execution - It provides a protected framework for automation of testing programs, whose behavior is unknown and must be investigated.

HTML Escaping Jinja 2 has a powerful automatic HTML Escaping, which helps to prevent Cross-site Scripting (XSS Attack). There are special characters like >,<,&, etc. which carry special meanings in the templates. So, if you want to use them as regular text in your documents then, replace them with entities. Not doing so might lead to XSS-Attack.

Template Inheritance - This feature helps us to generate new pages starting from a base template that we inherit a common structure.

How to get Jinja2

To start playing with it, just open a terminal and type:

$ pip install jinja2

Jinja in action

Simple runtime replace

>>> from jinja2 import Template
>>> t = Template("Hello {{ token }}!")
>>> t.render(token="Jinja2")
u'Hello Jinja2!'

The engine will replace the inner token with value Jinja2. This is quite useful when we use this block for different token values.

Jinja Links

Jinja2 - the official website
Jinja2 Documentation

✨ Flask/Jinja Template

To use or compile the project we need at least Python3 properly installed in our workstation. If you're not sure about it, please open a terminal window and type python --version.

$ # Check Python version
$ python --version
Python 3.7.2 # <--- All good

Using GIT to clone the source code is also recommended but optional. We can download the sources in ZIP format, no need to be familiar with a versioning system like GIT, in our case.

Codebase structure

< PROJECT ROOT >
   |
   |-- app/__init__.py
   |-- app/
   |    |-- static/
   |    |    |-- <css, JS, images>         # UI KIT assets
   |    |
   |    |-- templates/
   |    |    |
   |    |    |-- includes/                 # HTML chunks
   |    |    |    |
   |    |    |    |-- navigation.html      # Top bar
   |    |    |    |-- sidebar.html         # Left sidebar
   |    |    |    |-- scripts.html         # JS scripts
   |    |    |    |-- footer.html          # The common footer
   |    |    |
   |    |    |-- layouts/                  # App Layouts
   |    |    |    |
   |    |    |    |-- base.html            # Used by common pages 
   |    |    |    |-- base-fullscreen.html # Used by auth pages 
   |    |    |
   |    |  index.html                      # The default page
   |    |  login.html                      # Auth Login Page
   |    |  register.html                   # Registration Page
   |    |  page-404.html                   # Error 404 page 
   |    |  page-500.html                   # Error 500 page
   |    |    *.html                        # All other pages 
   |
   |-- requirements.txt
   |
   |-- run.py
   |
   |-- ********************************************

How to compile the source

The following (simplified) snippet is extracted from the README file. For full set up (major OSs) please access the project sources and follow the build instructions related to your OS. In case of any issues, don't hesitate to ask anything in the comments or request for LIVE support via Discord.

$ # Clone the sources
$ git clone https://github.com/app-generator/jinja2-black-dashboard.git
$ cd jinja2-black-dashboard
$
$ # Virtualenv set up
$ virtualenv env
$ source env/bin/activate
$
$ # Install requirements
$ pip3 install -r requirements.txt
$
$ # Set the FLASK_APP environment variable
$ export FLASK_APP=run.py
$
$ # Run the Jinja Template
$ flask run
$
$ # Access the UI in browser: http://127.0.0.1:5000/

If all goes well, we should see in the browser some nice pages, rendered by Jinja:

UI Alerts & Notification

UI Tables

Thank you!

Links & resources

See more starters coded on top of Black Dashboard design
More Jinja Templates - provided by AppSeed

Top comments (4)

Dinesh Chavan • Mar 20 '23

Hello Experts,
I want to escape '\' in jinja template am using in terraform, I tried multiple ways but somehow it's not happening!
Below is the code snippet :

 {%- if mrecords['values'] is defined -%}
                            {%- set txtrecord_set = namespace(value=[]) -%}
                            {%- for txtrecord in mrecords['values'] -%}
                                {%- set txt_value = '"' ~ '\' ~ '"' ~ txtrecord ~ '\' ~ '"' ~ '"'  -%}                              
                                {%- set txtrecord_set.value = txtrecord_set.value | append(txt_value) -%}
                            {%- endfor -%}

Error :

Unable to parse statement "if": Unable to parse statement "for": Unable to parse statement "set": Malformed 'set'-tag args. (Line: 63 Col: 66, near "' ~ txtrecord ~ '' ~ '")

Can you please help me resolve this issue ?

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