Enumerating Through Lists in a Django Template

Environment

python 3.6.5
django 2.1

===============

Enumerating in a Django Template

I recently had a problem where I had to enumerate through a list passed from the view to the template. You can use these methods below.

variable	definition
forloop.counter	enumerating, index starting from 1
forloop.counter0	enumerating, index starting from 0
forloop.revcounter	enumerating, index starting from the tail
forloop.revcounter0	enumerating, index starting from 0
forloop.first	true when index is at 0
forloop.last	true when index is at tail
forloop.parentloop	enumerates through the parent loop

An example of the forloop.counter will be:

{% for person in listlike_var %}
    {{ forloop.counter }} : {{ person.name }}
{% endfor %}

Output:

1: sally
2: bob
3: john

For forloop.counter0 it will be:

{% for person in listlike_var %}
    {{ forloop.counter0 }} : {{ person.name }}
{% endfor %}

0: sally
1: bob
2: john

As for the length of a list, listlike_var|length can be used.

{{ listlike_var|length }}

3

Comments

[Waylon Walker]

Interesting, I have never seen a Django template before. If there are nested loops is there a way to distinguish between inner and outer for loops. This magical for loop variable seems a bit mysterious to me. I have never really reached for a template language and mostly stuck with the built-in string Template for my very limited use of templates.

[Reishi Mitani]

Sorry for the late reply.
For two loops, it seems like there is the forloop.parentloop .
e.g. forloop.parentloop.counter
However for three or more loops I do not know yet whether there is a way to distinguish each of them.

This stackoverflow might be of a help: stackoverflow.com/questions/237651...