Jinja basics

"Jinja is a modern and designer-friendly templating language for Python, modelled after Django’s templates."

Jinja is widely used in the Python world and comes with a lot of features.

These are some of the common uses within Combine, but can always look at the Jinja documentation for more detail and functionality.

Inheritance and blocks

Extending templates is fundamental to how Combine works.

Any file can be "extended", but Combine will automatically keep anything ending in .template.html out your final build (you don't want base.template.html to be deployed to the live site).

<!-- base.template.html -->
<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My site</title>
    {% block content %}{% endblock %}

Use the defined blocks to insert your content.

<!-- pricing.html -->
{% extends "base.template.html" %}

{% block content %}
<div class="pricing">
    <div class="flex">
{% endblock %}

More about template inheritance →

Variables, loops, and if statements

Insert variables using {{ }}.

<!-- (HTML) -->
<meta name="description" content="{{ description }}">

Use filters to modify a variable during output.

<!-- (HTML) -->
<meta name="description" content="{{ description|striptags }}">

Iterate over objects using for-loops.

<!-- (HTML) -->
{% for item in ["one", "two", "three"] %}
<li>{{ item }}</li>
{% endfor %}

If statements use if, elif, and endif.

<!-- (HTML) -->
{% if custom_variable_name %}
<h1>Use {{ custom_variable_name }}</h1>
{% endif %}

Combine will throw an error if a variable is not defined, so if some pages have a variable that others don't, you might need to more specifically check if it is defined.

<!-- (HTML) -->
{% if custom_variable_name is defined %}
<h1>Use {{ custom_variable_name }}</h1>
{% endif %}


Use {# #} to leave comments in Jinja. Unlike HTML comments (<!-- -->), Jinja comments will not show up on the live site.

<!-- (HTML) -->
{# This is a comment #}

More about comments →

Syntax collisions

Sometimes you'll run into situations where Jinja's {{ }} syntax will conflict with a JavaScript library or writing code examples. The easiest way around this is to surround your code with the {% raw %}{% endraw %} tag. This works across multiple lines as well as on a single line.

For example:

<!-- (HTML) -->
<code>{% raw %}{% code %}{% endraw %}</code>

Would render this in your final HTML:

<!-- (HTML) -->
<code>{% code %}</code>

For variables that include HTML, use the |safe filter:

<!-- (HTML) -->
  {{ variable_with_html|safe }}

More about escaping →