Iktomi forms
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Iktomi is a library focused on form handling, providing features for user input validation, data conversion, and nested data structure management. It includes classes and functionalities for creating fields, converters, validators, and custom widgets in a web context. The library is utilized in various applications within iktomi-cms, enhancing SQLAlchemy interactions and enabling user-friendly forms in single-page applications.
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![Forms
class UncleForm(Form):
fields = [
Field('name'),
FieldList('nephews', field=FieldSet(None, fields=[
Field('name'),
])),
]
def process_form(env):
form = UncleForm(env, initial=init)
if form.accept(env.request.POST):
data = form.python_data
else:
errors = form.errors
{"name": "Scrooge",
"nephews": [{"name": "Huey"},
{"name": "Dewey"},
{"name": "Louie"}]}
{"name": "Required field"}
webob.Request.GET or any
MultiDict/dict
Nested data structure
Form subclass with defined fields](https://image.slidesharecdn.com/iktomiforms-140723051452-phpapp01/85/Iktomi-forms-4-320.jpg)
![Converters usage
field1 = Field('id', conv=Int(num_limit(0,10), positive, require=True))
field2 = Field('ids', conv=ListOf(Int()))
field3 = Field('name', conv=ListOf(EnumChoice(choices=[(val, label), ..])))
field4 = field3(conv=field3.conv(required=True))
model_f = FieldSet('user',
conv=convs.ModelChoice(model=User),
fields=[Field('id', conv=Int()),
Field('name')])
Converts a dict
result of FieldSet
to sqlalchemy object
validators
Fields, converters, widgets are easy
to copy and tweak
is included to raw_data MultiDict
Converter
ids=1&ids=2 => {"ids" [1, 2]}
check if value is not empty
after convertation
multiple select](https://image.slidesharecdn.com/iktomiforms-140723051452-phpapp01/85/Iktomi-forms-6-320.jpg)
![Widgets
Responsible for visual representation of an item
field1 = Field('id',
conv=Int(),
widget=TextInput(),
label='Id')
field3 = Field('options',
conv=ListOf(EnumChoice(choices=[(val, label), ..])),
widget=Select(template='widgets/custom-select.html'),
label='Options')
{{ form.render() }}
{{ form.get_field('id').widget.render() }}](https://image.slidesharecdn.com/iktomiforms-140723051452-phpapp01/85/Iktomi-forms-7-320.jpg)
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Iktomi forms
- 1. iktomi forms a part of iktomi lib http://iktomi.readthedocs.org/
- 2. Basics Validate user input Convert to internal representation Render forms, display validation error Work with nested data structures
- 3. Abstraction layers Form Field (+ FieldSet, FieldList, FieldBlock) Converter Widget permissions (rw) raw and clean values
- 4. Forms class UncleForm(Form): fields = [ Field('name'), FieldList('nephews', field=FieldSet(None, fields=[ Field('name'), ])), ] def process_form(env): form = UncleForm(env, initial=init) if form.accept(env.request.POST): data = form.python_data else: errors = form.errors {"name": "Scrooge", "nephews": [{"name": "Huey"}, {"name": "Dewey"}, {"name": "Louie"}]} {"name": "Required field"} webob.Request.GET or any MultiDict/dict Nested data structure Form subclass with defined fields
- 5. Converters and validators class Int(Converter): def to_python(self, val): if val == '': return None try: return int(val) except ValueError: raise ValidationError(error_msg) def from_python(self, val): return unicode(val) if val is not None else '' def validate(conv, value): if not check(value): raise ValidationError(error_msg) return value.strip() function for extra validation and cleaning can do additional one-way convertation errors are written into form.errors converts value to a string which is included to raw_data MultiDict Converts string (dict for FieldSet, list for FieldList) to python object of target type
- 6. Converters usage field1 = Field('id', conv=Int(num_limit(0,10), positive, require=True)) field2 = Field('ids', conv=ListOf(Int())) field3 = Field('name', conv=ListOf(EnumChoice(choices=[(val, label), ..]))) field4 = field3(conv=field3.conv(required=True)) model_f = FieldSet('user', conv=convs.ModelChoice(model=User), fields=[Field('id', conv=Int()), Field('name')]) Converts a dict result of FieldSet to sqlalchemy object validators Fields, converters, widgets are easy to copy and tweak is included to raw_data MultiDict Converter ids=1&ids=2 => {"ids" [1, 2]} check if value is not empty after convertation multiple select
- 7. Widgets Responsible for visual representation of an item field1 = Field('id', conv=Int(), widget=TextInput(), label='Id') field3 = Field('options', conv=ListOf(EnumChoice(choices=[(val, label), ..])), widget=Select(template='widgets/custom-select.html'), label='Options') {{ form.render() }} {{ form.get_field('id').widget.render() }}
- 8. batteries converter and widget set, including HTML cleaner I18n for error message
- 9. iktomi-cms Where do we use our forms? iktomi-cms: #sqlalchemy #single-page #streams-for-models #loners-for-single-objects #edit-log #autosave #item-locks #preview #inboxes #two-state-publishing #multilingual- models https://github.com/SmartTeleMax/iktomi-cms https://github.com/SmartTeleMax/iktomi-cms-demo