Lash La Rue . TWiki . TWikiForms (r1.4)	Lash La Rue webs: Main | TWiki? | Know? | Test?
	TWiki . { Home? | Welcome | Register | Changes | Index | Search | Go }

Form Templates

Topics allow for flexible free format data, sometimes you want to ensure strucutre to some of the topic information, this can be done with Forms e.g. saying what type of topic it is (e.g. Bug, Feature, FAQ entry etc) and then filling in fields using dropdowns, radio buttons etc.

Overview

If forms are enabled for a Web and a topic has a form you will see it as a table when viewing the page. When you edit you will see the various edit controls below the normal text area. There will be a button at the top of the form marked Change which allows you to change to a different form, or remove the form. If you edit a topic without a form, there will be a button Add Form, that let's you associate a form with the topic; note that changes you have made to the topic are not lost when you select this option.

You can search for topics with specific form data using the %SEARCH% variable - see TWikiVariables.

Goodby to TWikiCategoryTables

This is a more general replacement for the TWikiCategoryTable capability, in particular Forms are defined by special topics, where as categories were defineind using special templates.

Changes from the Category Table System

Main changes from TWikiCategoryTable: The templates for category view/edit have been dropped.and render to HTML on viewing

Migrating Existing Category Table Data

The new Form Template system should work with old Category Table data with no special conversion. Old data should be transparently upgraded to the new Meta format when a page imported from the old TWiki is edited and saved in the new system for the first time.

On upgrading, the administrator must produce a form template topic for each web that uses the old Category Tables. twikicatitems.tmpl defines the categories and is used in the conversion. The form template must be set as the first item in the WebPreferences variable =WEBFORM. If it's not present, view works, but edit results in an oops dialog result. If things aren't working correctly, there may be entries in data/warning.txt.

Form Template Elements

• Form Template: A set of fields defining a form. (Class in OO speak; used to be called category table definition)
  • A web may contain more then zero or more form template.
• Form: A topic containing additional meta-data (besides the free form TEXTAREA) which categorizes the content. (Object in OO speak; used to be called category table)
  • A topic has zero or one of the defined forms. So there are topics with a form or without.
• Form Field: A named item in a form. (Used to be called category item name)
• Field Type: The type of a field when editing a form. The type defines the HTML INPUT tag widgets when editing a topic:
  • select: Drop down box or selector
  • checkbox: One or more check boxes
  • checkbox+buttons: One or more check boxes, plus set and clear buttons to set/clear all check boxes
  • radio: One or more radio buttons
  • text: A one-line text field
  • textarea: A general text area - size is rowsxcols e.g. 40x10
• Field Value: Value of a form field. Can be one or more values from a fixed set (select, checkbox, radio type) or free form (text type). (Used to be called category item value)

Defining a Form Template

Form templates are defined by topics, one topic per form template. A form template topic has descriptive text mixed with the form template definition in the form of a TWiki table.

Examples

Defining a Form in One Topic

Example: WebFormTemplate of the TWiki.Know web:

Defining a Form in Multiple Topics

The form template can also be defined in an alternative way by using more then one topic:

• A form template topic defines the form
• Values of fields that have more then one value, e.g. of type radio, select and checkbox can be defined by field value template topics

Above Example:

• WebFormTemplate of the TWiki.Know web:

  Name:	Type:	Size:	Values:	Tooltip message:
  TopicClassification	select	1		blah blah...
  OperatingSystem	checkbox	3		blah blah...
  OsVersion	text	16		blah blah...

• TopicClassification topic:

  Name:	Type:	Tooltip message:
  NoDisclosure	option	blah blah...
  PublicSupported	option	blah blah...
  PublicFAQ	option	blah blah...

Notes

• This format allows you to define field items with / without WikiNames, depending on your needs.
• The topic can be protected in the usual manner so that not everybody can change the form template - see TWikiAccessControl
• ... can be used for force a link, at present ... format is not supported
• The "Tooltip message:" column is used as a tool tip for the field name (only if field name is a WikiName) - you only see the tooltip on edit
• The first item in the list is the default item. Alternative initial values can be given in a topic template such as WebTopicEditTemplate or using fieldFLD=value or for checkboxes fieldFLDcheckbox=1 in URL
• The topic definition is not read when a topic is viewed

Specification

Enabling Forms for a Web

By default topics can be edited in free form. A form can be added to a topic to give it more structure. Forms are enabled on a per web basis.

The WEBFORMS variable in WebPreferences is optional and defines a list of possible form templates e.g.

• Set WEBFORMS = BugForm, FeatureForm, BookLoanForm

With this present an extra button is added to the edit view. If the topic doesn't have a form an Add Form button appears at the end of the topic. If a form is present a Change button appears in the top row of the form to the right of the form name. The buttons leads to a screen that enables no form to be selected of one of those specified by WEBFORMS.

A default form template (i.e. new topics get this default form) can be provided by creating the WebTopicEditTemplate topic in a Web and adding a form to it. Initial form values can be set here.

Addtionaly a new topic can be given a form using the formtemplate parameter in the URL. Initial values can then be provided in the URLs or as form values. Names being:

• Not checkboxs - nameFLD e.g. ?BugPriorityFLD=1
• Checkbox - nameFLDvalue=1 e.g. ?ColourFLDRed=1. Note that all boxes with a tick must be specified.

Creating New Topics with Forms

When you create a new topic in a web that has the WEBFORMS Preferences variable set, an [Add Form] button appears at the bottom of the page. If the WebTopicEditTemplate topic has a form added, the form will appear with values set; press [Change] to remove the template or to switch to a different one.

A form embedded in a topic also appears in a new topic. This is done by specifying the formtemplate parameter in the URL.

Setting Up Multiple Form Options

• The optional WEBFORMS variable defines alternative Form Templates that can be selected after pressing [Change] button on the Edit page
• A template topic can use any form template
• Decided not to ask user to choose a template or form template when creating a topic as goes against the KISS of Wiki systems.
• New topics with a form get instantiated by simple HTML forms asking for a topic name. If there is a SubmitExpenseReport topic were you can create new expense reports, a SubmitVacationRequest topic and so on. These can specify the required template topic and hence form. HUH?

Form Template Data Storage

The Form Template topic name, fields and values are stored in the topic Meta Data. The order of field/value pairs in the Meta Data is the same as in the Template. The Form name is required for [Edit] and [Save]. -- JohnTalintyre - 16 Aug 2001