This can be used in a forms.Form or forms.ModelForm in django. Render a decimal field between 0 and 1 into a value between 0 and 100, and vice-versa.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | from django.forms import IntegerField
from django.forms.widgets import Input
from django.forms.util import ValidationError
from django.utils.translation import ugettext_lazy as _
from decimal import Decimal
class PercentInput(Input):
""" A simple form input for a percentage """
input_type = 'text'
def _format_value(self, value):
if value is None:
return ''
return str(int(value * 100))
def render(self, name, value, attrs=None):
value = self._format_value(value)
return super(PercentInput, self).render(name, value, attrs)
def _has_changed(self, initial, data):
return super(PercentInput, self)._has_changed(self._format_value(initial), data)
class PercentField(IntegerField):
""" A field that gets a value between 0 and 1 and displays as a value between 0 and 100"""
widget = PercentInput(attrs={"class": "percentInput", "size": 4})
default_error_messages = {
'positive': _(u'Must be a positive number.'),
}
def clean(self, value):
"""
Validates that the input can be converted to a value between 0 and 1.
Returns a Decimal
"""
value = super(PercentField, self).clean(value)
if value is None:
return None
if (value < 0):
raise ValidationError(self.error_messages['positive'])
return Decimal("%.2f" % (value / 100.0))
|
More like this
- Template tag - list punctuation for a list of items by shapiromatron 8 months, 3 weeks ago
- JSONRequestMiddleware adds a .json() method to your HttpRequests by cdcarter 9 months ago
- Serializer factory with Django Rest Framework by julio 1 year, 3 months ago
- Image compression before saving the new model / work with JPG, PNG by Schleidens 1 year, 4 months ago
- Help text hyperlinks by sa2812 1 year, 5 months ago
Comments
hi Fybl, thanks for posting your snippet. I added:
l.12\
if value is None or value == "":
l18
return super(PercentInput, self).render(name, value, attrs) + mark_safe(u' %')
#
Please login first before commenting.