collective.z3cform.datagridfield 0.5

Version of DataGridField for use with Dexterity / z3c.form

Introduction

Licence: GNU General Public License

This module provides a z3c.form version of the Products.DataGridField. This product was developed for use with Plone4 and Dexterity.

Requirements

• Plone 4

• z3c.forms

• A browser with javascript support

• jquery 1.4.3 or later

Installation

Add collective.z3cforms.datagridfield to your buildout eggs.:

eggs=\
    ...
    collective.z3cforms.datagridfield

Example usage

This piece of code demonstrates a schema which has a table within it. The layout of the table is defined by a second schema.:

from zope import schema
from zope import interface
from plone.directives import form

form collective.z3cforms.datagridfield import DataGridFieldFactory, DictRow

class ITableRowSchema(interface.Interface):
    one = schema.TextLine(title=u"One")
    two = schema.TextLine(title=u"Two")
    three = schema.TextLine(title=u"Three")

class IFormSchema(interface.Interface):
    four = schema.TextLine(title=u"Four")
    table = schema.List(title=u"Table"
        value_type=DictRow(title=u"tablerow", schema=ITableRowSchema))

class EditForm(form.EditForm):
    extends(form.EditForm)

    grok.context(IFormSchema)
    grok.require('zope2.View')
    fields = field.Fields(IFormSchema)
    label=u"Demo Usage of DataGridField"

    fields['table'].widgetFactory = DataGridFieldFactory

Storage

The data can be stored as either a list of dicts or a list of objects. If the data is a list of dicts, the value_type is DictRow. Otherwise, the value_type is ‘schema.Object’.

If you are providing an Object content type (as opposed to dicts) you must provide your own conversion class. The default conversion class returns a list of dicts, not of your object class. See the demos.

Configuration

The widget can be customised via the updateWidgets method.

def updateWidgets(self):

super(EditForm, self).updateWidgets() self.widgets[‘table’].allow_insert = False # Enable/Disable the insert button on the right self.widgets[‘table’].allow_delete = False # Enable/Disable the delete button on the right self.widgets[‘table’].auto_append = False # Enable/Disable the auto-append feature

The widget contains an attribute ‘columns’ which is manipulated to hide column titles.

Manipulating the Sub-form

The DataGridField makes use of a subform to build each line. The main DataGridField contains a DataGridFieldObject for each line in the table. The DataGridFieldObject in turn creates the DataGridFieldObjectSubForm to store the fields.

There are two callbacks to your main form:

datagridInitialise(subform, widget)

• This is called when the subform fields have been initialised, but before the widgets have been created. Field based configuration could occur here.

datagridUpdateWidgets(subform, widgets, widget)

• This is called when the subform widgets have been created. At this point, you can configure the widgets, e.g. specify the size of a widget.

Notes

I have attempted to keep the markup close to Products.DataGridField, so that the styling approach is the same.

TODO

• Testing

• The mechanism to hide/omit columns is cumbersome. This needs to be revisited.

• Better styling of table in read-only mode. Merge the display and input versions of the layout.

• Move rows up / down

• kss validation - highlight the incorrect row, rather than the entire widget. Possibly show the error message in the field cell.

• hidden mode

Demo

Examples are in the package collective.z3cform.datagridfield_demo.

References

• http://pypi.python.org/pypi/Products.DataGridField

• http://pypi.python.org/pypi/collective.z3cform.datagridfield_demo

Changelog

0.5 (2011-02-08)

• Put in the DictRow class (tks Martin Aspeli)

• Moved the demo code out to a separate package collective.z3cform.datagridfield_demo (tks Laurence Rowe).

• Removed superfluous lines from setup.py (tks Laurence Rowe).

• Removed unnessary dependency on dexterity (tks Laurence Rowe).

• Removed unnessary dependency on grok (tks Laurence Rowe).

0.4 (2011-02-06)

• Renamed the demo pages. The starting point is now @@demo-collective.z3cform.datagrid .

• The widget can now be configured via the updateWidgets method. It is no longer necessary to create a custom factory.

• The columns can now be omitted.

• Provide a set of demo views for Object access.

0.3 (2011-02-04)

• The auto-append functionality did not bind correctly for popup forms. I switched to using jQuery.live() instead of binding at document load time.

• Added a menu to the demo pages

• Added a display only form option.

• Fixed the restructured text of the main README.txt so that it will show more friendly in PyPI.