por Jinja control structures are a set of fundamental elements that accompany the operation of the Flask dependency for Python: jinja software. Jinja control structures are essential, since they are the ones that control the form or flow of the code program that requires templates. So, below, we tell you what dependency is about, what Jinja’s control structures are and how they work.
What is Jinja about?
Before telling you what Jinja’s control structures are, we will remind you what jimja is about and how it works. Jinja is a dependency that comes hand in hand with the installation of Flask in your programs made with Python for the development of web pages and applications. It is a dependency that is responsible for generating and controlling the templates or templates which are used to write programs with the Python programming language.
Jinja is responsible for passing data through the template and then rendering it in the final document. At the same time, it has different elementsas template inheritancemacros or HTML templateamong other tools for creating templates and web applications.
What are Jinja control structures?
The Jinja control structure or control structure They are made up of a list of variables that, according to the official documentation of the dependency, are responsible for controlling the flow of the program and other conditions that have been established in the code program. All the control structures that you will see below They will be established in the following blocks: {% … %}.
For
This control structure is responsible for looping through the elements of a sequence. Here you can put a list of any kind. To work with forthe following methods must be represented, being users an example of the list (jinja {%):
{% for user in users %}
{% endfor %}
If
According to Jinja’s documentation, the if of this dependency is very similar to if statement which makes up the elements of Python. The representation of this control structure is as follows:
{% if users %}
{% endif %}
Macros
This control structure carries many of the functions that everyday programming languages on the market have. This is used when you want to repeat the use of certain functions. Next, we present the representation of the use of the macro control structure in a code program:
{% macro input() -%}
{%- endmacro %}
call
If, on the other hand, you need to go from one macro to another framework, you will need to use the control or block call. Next, we present how the control structure can be represented call:
{% macro -%}
{%- endmacro %}
#call block
{% call %}
{% endcall %}
Filters
The control structure of filters It is responsible for allowing normal Jinja templates to be established in data blocks. The representation of filters It looks like this:
{% filter %}
{% endfilter %}
Assignments
When you use the control structure assignments, allows you to assign values to variables. The assignments are represented with the variable setas you will see below:
{% set %}
{% set %}
If you want to know more about the concept of what are Jinja control structureswe recommend that you visit the official Jinja documentation, as there you will find examples of the use of these dependency elements.
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Now that you know what Jinja control structures are and how you can implement them, you will have much more ownership to represent these elements in your code program and allow them to be much more practical and with fewer errors.
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