How to output loop.counter in python jinja template?
Inside of a for
-loop block, you can access some special variables, such as loop.index
(but not loop.counter
). From the official docs:
Variable | Description |
---|---|
loop.index |
The current iteration of the loop. (1 indexed) |
loop.index0 |
The current iteration of the loop. (0 indexed) |
loop.revindex |
The number of iterations from the end of the loop (1 indexed) |
loop.revindex0 |
The number of iterations from the end of the loop (0 indexed) |
loop.first |
True if first iteration. |
loop.last |
True if last iteration. |
loop.length |
The number of items in the sequence. |
loop.cycle |
A helper function to cycle between a list of sequences. |
loop.depth |
Indicates how deep in a recursive loop the rendering currently is. Starts at level 1 |
loop.depth0 |
Indicates how deep in a recursive loop the rendering currently is. Starts at level 0 |
loop.previtem |
The item from the previous iteration of the loop. Undefined during the first iteration. |
loop.nextitem |
The item from the following iteration of the loop. Undefined during the last iteration. |
loop.changed(*val) |
True if previously called with a different value (or not called at all). |
The counter variable inside the loop is called loop.index
in Jinja2.
>>> from jinja2 import Template
>>> s = "{% for element in elements %}{{loop.index}} {% endfor %}"
>>> Template(s).render(elements=["a", "b", "c", "d"])
1 2 3 4
In addition to loop.index
, there is also
loop.index0
(index starting at0
)loop.revindex
(reverse index; ending at1
)loop.revindex0
(reverse index; ending at0
)- Even more at http://jinja.pocoo.org/docs/templates/.
If you are using Django, use forloop.counter
instead of loop.counter
:
<ul>
{% for user in userlist %}
<li>
{{ user }} {{forloop.counter}}
</li>
{% if forloop.counter == 1 %}
This is the First user
{% endif %}
{% endfor %}
</ul>