A CharField (Model) that checks that the value is a valid HTML color code (Hex triplet) like #FFEE00.
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 | from django.db import models
from django.core import validators
class HtmlColorCodeField(models.CharField):
"""
A CharField that checks that the value is a valid HTML color code (Hex triplet).
Has no required argument.
"""
def __init__(self, **kwargs):
kwargs['max_length'] = 7
validator_list = kwargs.get('validator_list', [])
validator_list.append(HtmlColorCodeField.is_html_color_code)
kwargs['validator_list'] = validator_list
super(HtmlColorCodeField,self).__init__(**kwargs)
def get_internal_type(self):
return "CharField"
@staticmethod
def is_html_color_code(field_data, all_data):
"""
Checks that field_data is a HTML color code string.
"""
try:
if not field_data.startswith("#") or not field_data[1:].isalnum() or not len(field_data) == 7:
raise validators.ValidationError("Please enter a valid HTML color.")
except (TypeError, ValueError), e:
raise validators.ValidationError, str(e)
def validate(self, value, all_values):
HtmlColorCodeField.is_html_color_code(value, all_values)
|
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