Django: How to check if field widget is checkbox in the template?

Question

I\'ve created a custom template for rendering form fields:

    
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Answer 1

Use a custom template filter!

In yourapp/templatetags/my_custom_tags.py:

from django import template
from django.forms import CheckboxInput

register = template.Library()

@register.filter(name='is_checkbox')
def is_checkbox(field):
  return field.field.widget.__class__.__name__ == CheckboxInput().__class__.__name__

In your template:

{% load my_custom_tags %}
 
{% if field|is_checkbox %}
  do something
{% endif %}

Side note on implementation: when I don't instantiate a CheckboxInput, the class name is MediaDefiningClass.

>>> form django.forms import CheckboxInput
KeyboardInterrupt
>>> CheckboxInput.__class__.__name__
'MediaDefiningClass'

Answer 2

{{ field.field.widget.input_type }} will get you this info for a lot of widgets, but not all. I'm not sure if it'll work for the default checkbox widget or not. Worth a shot.

Answer 3

It is kind of late to answer, but I implemented something similar to what is done in Django's admin.

First, I added a new attribute is_checkbox to the Field class:

# forms.py
from django import forms
from django.forms.fields import Field
setattr(Field, 'is_checkbox', lambda self: isinstance(self.widget, forms.CheckboxInput ))

Then, I can easily detect a CheckboxInput widget in the template. Here is an example to render checkboxes to the left and other widgets to the right:

{% if field.field.is_checkbox %}
    {{ field }} {{ field.label_tag }}
{% else %}
    {{ field.label }} {{ field }}
{% endif %}