Login

(en-US) Humanized Decimal Field

Author:
ActionScripted
Posted:
July 1, 2008
Language:
Python
Version:
.96
Score:
3 (after 3 ratings)

Simple DecimalField class extension that automatically adds formatting and validation for comma-separated "decimals". Works wonderfully for price fields.

Could be extended to strip dollar signs or to be locale-agnostic. 

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
""" Stay DRY, import intcomma """
from django.contrib.humanize.templatetags.humanize import intcomma


class USDecimalHumanizedInput(forms.TextInput):
  def __init__(self, initial=None, *args, **kwargs):
    super(USDecimalHumanizedInput, self).__init__(*args, **kwargs)
  
  def render(self, name, value, attrs=None):
    value = intcomma(value)
    return super(USDecimalHumanizedInput, self).render(name, value, attrs)


class USDecimalHumanizedField(forms.DecimalField):
  """
  Use this as a drop-in replacement for forms.DecimalField()
  """
  widget = USDecimalHumanizedInput
  
  def clean(self, value):
    value = value.replace(',','')
    super(USDecimalHumanizedField, self).clean(value)
    return value

More like this

  1. get_object_or_none by azwdevops 3 months, 2 weeks ago
  2. Mask sensitive data from logger by agusmakmun 5 months, 1 week ago
  3. Template tag - list punctuation for a list of items by shapiromatron 1 year, 7 months ago
  4. JSONRequestMiddleware adds a .json() method to your HttpRequests by cdcarter 1 year, 7 months ago
  5. Serializer factory with Django Rest Framework by julio 2 years, 2 months ago

Comments

ActionScripted (on July 2, 2008):

I've noticed that when initializing without an explicit initial value, the field defaults to the string "None".

Not sure how to change this, but it'd be great if it would just fall-back to an empty string ("").

#

Davepar (on July 15, 2010):

Line 22 should be:

value = super(USDecimalHumanizedField, self).clean(value)

Otherwise the value never gets turned into a Decimal type.

#

hobbesdaboba (on June 14, 2011):

Just in case anyone still uses this, to fix the "None" problem mentioned by ActionScripted, simply change line 10 so that:

if value: value = intcomma(value) else: value = ''

#

Please login first before commenting.