Table of Contents

• Introduction
  • Requirements
• Installation
• Example usage
  • Storage
• Configuration
  • Row editor handles
  • Block edit mode
  • Manipulating the Sub-form
  • Working with plone.app.registry
  • JavaScript events
• Demo

Introduction

Provides a field with a datagrid (table), where each row is a sub form.

It is a z3c.form version of the Products.DataGridField .

This product was developed for use with Plone and Dexterity.

• Requirements

Requirements

• Plone >= 4.3
• z3c.forms
• A browser with javascript support
• jquery 1.4.3 or later

Installation

Add collective.z3cform.datagridfield to your buildout eggs:

[buildout]
...
eggs =
    collective.z3cform.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 collective.z3cform.datagridfield import DataGridFieldFactory
from collective.z3cform.datagridfield import DictRow
from z3c.form import field
from z3c.form import form
from z3c.form.form import extends
from zope import interface
from zope import component
from zope import schema


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))

@component.adapter(IFormSchema)
class EditForm(form.EditForm):

    fields = field.Fields(IFormSchema)
    label=u"Demo Usage of DataGridField"

    fields['table'].widgetFactory = DataGridFieldFactory

Configured like so:

<browser:page
    name="editform--example"
    class=".editform.EditForm"
    for="*"
    permission="zope2.View"
    />

Also it can be used from a supermodel XML:

<field name="table" type="zope.schema.List">
  <description/>
  <title>Table</title>
  <value_type type="collective.z3cform.datagridfield.DictRow">
    <schema>your.package.interfaces.ITableRowSchema</schema>
  </value_type>
  <form:widget type="collective.z3cform.datagridfield.DataGridFieldFactory"/>
</field>

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

Row editor handles

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
    self.widgets['table'].allow_reorder = False  # Enable/Disable the re-order rows feature
    self.widgets['table'].main_table_css_class = 'my_custom_class'  # Change the class applied on the main table when the field is displayed

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

Block edit mode

A widget class variation BlockDataGridField is provided. This widget renders subform widgets vertically in blocks instead of horizontally in cells. It makes sense when there are many subform fields and they have problem to fit on the screen once.

Example:

class EditForm9(EditForm):
    label = u'Rendering widgets as blocks instead of cells'

    grok.name('demo-collective.z3cform.datagrid-block-edit')

    def update(self):
        # Set a custom widget for a field for this form instance only
        self.fields['address'].widgetFactory = BlockDataGridFieldFactory
        super(EditForm9, self).update()

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.

Here is an example how one can customize per-field widgets for the data grid field:

from .widget import DGFTreeSelectFieldWidget
from collective.z3cform.datagridfield import DataGridFieldFactory
from collective.z3cform.datagridfield import DictRow
from Products.CMFCore.interfaces import ISiteRoot
from z3c.form import form
from zope import interface
from zope import schema


class ITableRowSchema(form.Schema):

    form.widget(one=DGFTreeSelectFieldWidget)
    one = schema.TextLine(title=u"Level 1")

    form.widget(two=DGFTreeSelectFieldWidget)
    two = schema.TextLine(title=u"Level 2")

    # Uses the default widget
    three = schema.TextLine(title=u"Level 3")


class IFormSchema(form.Schema):

    form.widget(table=DataGridFieldFactory)
    table = schema.List(
        title=u"Nested selection tree test",
        value_type=DictRow(
            title=u"tablerow",
            schema=ITableRowSchema
        )
    )

Working with plone.app.registry

To use the field with plone.app.registry, you'll have to use a version of the field that has PersistentField as it's base class:

from collective.z3cform.datagridfield.registry import DictRow

JavaScript events

collective.z3cform.datagridfield fires jQuery events, so that you can hook them in your own Javascript for DataGridField behavior customization.

The following events are currently fired against table.datagridwidget-table-view

• beforeaddrow [datagridfield, newRow]
• afteraddrow [datagridfield, newRow]
• beforeaddrowauto [datagridfield, newRow]
• afteraddrowauto [datagridfield, newRow]
• aftermoverow [datagridfield]
• afterdatagridfieldinit - All DGFs on the page have been initialized

Example usage:

var handleDGFInsert = function(event, dgf, row) {
    row = $(row);
    console.log("Got new row:");
    console.log(row);
};

// Bind all DGF handlers on the page
$(document).on('beforeaddrow beforeaddrowauto', '.datagridwidget-table-view', handleDGFInsert);

Demo

More examples are in the demo subfolder of this package.