31 lines
921 B
Python
31 lines
921 B
Python
"""
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Provides a django form field to handle a signature capture field with
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with jSignature jQuery plugin
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"""
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import json
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from django.forms.fields import Field
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from django.core import validators
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from django.core.exceptions import ValidationError
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from .widgets import JSignatureWidget
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JSIGNATURE_EMPTY_VALUES = validators.EMPTY_VALUES + ('[]', )
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class JSignatureField(Field):
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"""
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A field handling a signature capture field with with jSignature
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"""
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widget = JSignatureWidget()
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def to_python(self, value):
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"""
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Validates that the input can be red as a JSON object.
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Returns a Python list (JSON object unserialized).
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"""
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if value in JSIGNATURE_EMPTY_VALUES:
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return None
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try:
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return json.loads(value)
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except ValueError:
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raise ValidationError('Invalid JSON format.')
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