% Module in Django template

Question

I am looking for a way to use something like a module operator in django. I am trying to add a class to every fourth element of the loop.

With the module, it will look like this:

{% for p in posts %} <div class="post width1 height2 column {% if forloop.counter0 % 4 == 0 %}first{% endif %}}"> <div class="preview"> </div> <div class="overlay"> </div> <h2>p.title</h2> </div> {% endfor %} 

Of course, this does not work, because% is a reserved character. Is there any other way to do this?

Answer 1

You need divisibleby , a built-in django filter.

 {% for p in posts %} <div class="post width1 height2 column {% if forloop.counter0|divisibleby:4 %}first{% endif %}"> <div class="preview"> </div> <div class="overlay"> </div> <h2>p.title</h2> </div> {% endfor %} 

Answer 2

You cannot use the module operator in Django template tags, but it would be enough to write a filter to do this. Something like this should work:

 @register.filter def modulo(num, val): return num % val 

And then:

 {% ifequal forloop.counter0|modulo:4 0 %} 

Instead, you can do something like this:

 @register.filter def modulo(num, val): return num % val == 0 

And then:

 {% if forloop.counter0|modulo:4 %} 

---

Or you can use the cycle tag:

 <div class="post width1 height2 column {% cycle 'first' '' '' '' %}"> 

Answer 3

Looks like you should just use a loop tag. Built-in Template Tags

Answer 4

Example of rows and columns of the bootstrap. A new line every 4 items. Also close the last line, even if it is less than 4.

Myapp / templatetags / my_tags.py

 from django import template register = template.Library() @register.filter def modulo(num, val): return num % val 

html template

 {% load my_tags %} {% for item in all_items %} {% if forloop.counter|modulo:4 == 1 %} <div class="row"> {% endif %} <div class="col-sm-3"> {{ item }} </div> {% if forloop.last or forloop.counter|modulo:4 == 0 %} </div> {% endif %} {% endfor %}