d0ae3a9c43
Django changed the way media assets are merged, now using a topological sort algorithm. Dependencies are now needed to be added in the media so they are recognized by the algorithm.
84 lines
2.8 KiB
Python
84 lines
2.8 KiB
Python
"""
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Provides a django form widget 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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import six
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from django.template.loader import render_to_string
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from django.forms.widgets import HiddenInput
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from django.core import validators
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from django.core.exceptions import ValidationError
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from django.utils.safestring import mark_safe
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from django.utils.translation import ugettext_lazy as _
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from jsignature.settings import JSIGNATURE_DEFAULT_CONFIG
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JSIGNATURE_EMPTY_VALUES = validators.EMPTY_VALUES + ('[]', )
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class JSignatureWidget(HiddenInput):
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"""
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A widget handling a signature capture field with with jSignature
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"""
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# Actually, this widget has a display so we want it to behave like a
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# normal field, not a hidden one
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is_hidden = False
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class Media:
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js = ('admin/js/jquery.init.js',
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'js/jSignature.min.js',
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'js/django_jsignature.js')
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def __init__(self, attrs=None, jsignature_attrs=None):
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super(JSignatureWidget, self).__init__(attrs)
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# Store jSignature js config
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self.jsignature_attrs = jsignature_attrs or {}
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def build_jsignature_config(self):
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""" Build javascript config for jSignature initialization.
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It's a dict with for which default values come from settings
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and can be overriden by jsignature_attrs, given at widget
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instanciation time """
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jsignature_config = JSIGNATURE_DEFAULT_CONFIG.copy()
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jsignature_config.update(self.jsignature_attrs)
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return jsignature_config
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def build_jsignature_id(self, name):
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""" Build HTML id for jsignature container.
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It's important because it's used in javascript code """
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return 'jsign_%s' % name
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def prep_value(self, value):
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""" Prepare value before effectively render widget """
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if value in JSIGNATURE_EMPTY_VALUES:
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return "[]"
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elif isinstance(value, six.string_types):
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return value
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elif isinstance(value, list):
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return json.dumps(value)
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raise ValidationError('Invalid format.')
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def render(self, name, value, attrs=None, renderer=None):
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""" Render widget """
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# Build config
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jsign_id = self.build_jsignature_id(name)
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jsignature_config = self.build_jsignature_config()
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# Prepare value
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value = self.prep_value(value)
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# Build output
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context = {
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'hidden': super(JSignatureWidget, self).render(name, value, attrs),
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'jsign_id': jsign_id,
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'reset_btn_text': _('Reset'),
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'config': jsignature_config,
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'js_config': mark_safe(json.dumps(jsignature_config)),
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'value': mark_safe(value),
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}
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out = render_to_string('jsignature/widget.html', context)
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return mark_safe(out)
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