First version

jsignature/forms.py

@@ -0,0 +1,27 @@
+"""
+    Provides a django form field to handle a signature capture field with
+    with jSignature jQuery plugin
+"""
+import json
+from django.forms.fields import Field
+from django.core import validators
+from django.core.exceptions import ValidationError
+from .widgets import JSignatureWidget
+
+class JSignatureField(Field):
+    """
+    A field handling a signature capture field with with jSignature
+    """
+    widget = JSignatureWidget()
+
+    def to_python(self, value):
+            """
+            Validates that the input can be red as a JSON object. Returns a Python
+            datetime.date object.
+            """
+            if value in validators.EMPTY_VALUES:
+                return None
+            try:
+                return json.loads(value)
+            except ValueError:
+                raise ValidationError('Invalid JSON format.')