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Overview

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Field Types define what kind of data can be stored in a Field.

Field is the smallest unit for storing data in the content structure. Ea= ch Field can store data of a specific kind, defined by a Field Type.

To read more about the content structure in eZ, see Fundamental concepts.

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In this topic

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Field Type Structure=20
Preset Field Types

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Related topics

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= Fundamental concep= ts

= Content Types<= /span>

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Field Type Structure

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The characteristics of a Field are determined by its Field Type. In eZ, = a Field is made up of the following elements:

Name - stores a user-friendly name that describes the Fiel= d:
- The name of a Field can consist of letters, digits, spaces and special = characters.
- The maximum length is 255 characters.
- If a blank name is provided, eZ automatically generates a unique name f= or the Field.

Example: The title of= the Article

Identifier - stores the Name in the system. The internal u= se requires:
- no more than 50 characters.
- no special characters.
- underscore permitted.

Example: article_titl= e

Description - gives details about the Field

Example: A brief desc= ription of the Article

Generic controls - provides a set of common propertie= s for all Field Types. These controls are the same for each Field, regardle= ss of its Field Type. There are following generic controls available by def= ault in the system:
- Required
- Searchable
- Translatable
- Field Group
Field Type specific controls - provide a unique set o= f properties for each Field Type structure. Depending of those properties, = you will have different configurations and then different behaviors.

Take the =E2=80=9CContent relation (multi= ple)=E2=80=9D Field Type: you can decide to have relation only to Content i= tems of a specific Content Type or to Content items of any Content Type.

Basically, all Field Types have different= properties.

^{You have an option of creating your own, custom Field Types, at a d=
eveloper lever using PHP.}

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Preset Field Types

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Below are listed the preset Field Types existing in every installation, = as well as their specific controls.

Tip

^{You can also see all available Field Types by selecting the Almight=
y Content Type contained in the Platform Demo bundle.}

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Field Type	Description	Specific controls
Authors	a list of authors, consisting= of author name and email	-
Checkbox	checked or unchecked box	-
Content relation (single)	relation with a single Content item	Default selection item - the Content item which is selected by default = (but can be changed)
Content relation (multiple)	relation with multiple Content items	Default location - the location which is selected by default (but can b= e changed) Allowed content types - Content Type(s) which can be linked to
Country	country selected from a drop-down list	Multiple Choice - allows selection of multiple countries at the same ti= me Select which countries by default - the country which is selected by de= fault
Date	day date	Default value - choice between Empty and Current date
Date and time	day date and time	Use seconds Default value - choice between Empty, Current datetime or Adjusted curr= ent datetime
E-mail address	a single e-mail address	-
File	a file of any type, uploaded from the user's sys= tem	Maximum file size (MB)
Float	a floating-point number	Minimum value Maximum value
ISBN	an International Standard Book Number	ISBN-13 format - the ISBN provided in a 13-digit instead of 10-digit fo= rmat
Image	an image uploaded from the user's system	Maximum file size (byte)
Integer	an integer number	Minimum value Maximum value
Keywords	a keyword or list of comma-separat= ed keywords	-
Layout	a special Field Type for determini= ng the layout of a Landing Page	Default layout
Map location	location on a map, represented as = a set of coordinates	-
Media	a media file, uploaded from the us= er's system	Maximum file size (MB) Media type - type of file which can be uploaded
Rating	rating for a page	-
Rich text	a block of rich text	Number of text rows in the editor
Selection	selection from a list of multiple = choices	Multiple choice Options
Text block	block of unformatted text	Number of text rows
Text line	line of unformatted text (a simple= string)	Minimum length Maximum length Default value
Time	hour and minute (and possibly seco= nd) time	Use seconds Default value - choice between Empty and Current time
URL	link consisting of a url and link = text	-
User account	reference to a user account	-

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