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https://github.com/automattic/custom-metadata

A WordPress plugin that provides an easy way to add custom fields to your object types (post, pages, custom post types, users)
https://github.com/automattic/custom-metadata

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A WordPress plugin that provides an easy way to add custom fields to your object types (post, pages, custom post types, users)

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README 

        
# Custom Metadata Manager for WordPress



This code-only developer WordPress plugin allows you to add custom fields to your object types (post, pages, custom post types, users)



This is a WordPress Plugin. We sync changes between github and the [WordPress.org plugin repository](http://wordpress.org/extend/plugins/custom-metadata/). Why? Because collaboration is made much easier on github :)



**NOTE**: The plugin requires WordPress 3.5+



# Installation



1. Install through the WordPress admin or upload the plugin folder to your `/wp-content/plugins/` directory

2. Activate the plugin through the 'Plugins' menu in WordPress

3. Add the necessary code to register your custom groups and fields to your functions.php or plugin.

4. Enjoy!



# Frequently Asked Questions



## Why a code-based approach instead of a UI?



Because the UI thing has [been](http://wordpress.org/extend/plugins/verve-meta-boxes/) [done](http://wordpress.org/extend/plugins/fresh-page/) [before](http://wordpress.org/extend/plugins/pods/). And this more closely aligns with the existing WordPress approach of registering new types of content (post types, taxonomies, etc.)



This is also a developer feature, aimed towards site builders. And real developers don't need UIs ;)



(But really, though, the main benefit of this fact comes into play when you're working with multiple environments, i.e. development/local, qa/staging, production. This approach makes it easy to replicate UIs and features without having to worry about database synchronization and other crazy things.)



For another really well-done, really powerful code-based plugin for managing custom fields, check out [Easy Custom Fields](http://wordpress.org/extend/plugins/easy-custom-fields/) and the [Custom Metaboxes and Fields For WordPress Class](https://github.com/jaredatch/Custom-Metaboxes-and-Fields-for-WordPress).



## Why isn't the function just `add_metadata_field`? Do you really need the stupid `x_`?



We're being good and ["namespacing" our public functions](http://andrewnacin.com/2010/05/11/in-wordpress-prefix-everything/). You should too.



## How do I use this plugin?



There are usage instructions below



# Changelog



## 0.8 (currently under development)



* added ability to group several fields as a `multifield`; see `x_add_metadata_multifield()`, props @greatislander, @rinatkhaziev and @PhilippSchreiber for their contributions there

* allow field types that save as multiples but don't display as cloneable or multiples

* added the `taxonomy_checkbox` and `taxonomy_multi_select` field types, props @greatislander

* made use of the `selected()` and `checked()` functions in WordPress instead of clumsy if statements

* limit or exclude groups and fields using a custom callback

* adjusted the copyright to include 2013 and to list "The Contributors" instead of specific individuals

* adjusted the list of contributors in the plugin

* adjusted the plugin URL and removed the donate URL

* adjusted files for code standards

* fixed PHP warning with empty values for date fields

* moved filtering of instance vars to `init` instead of on `construct` which runs too early

* added new field types: `number`, `email`, `telephone`, `datetimepicker`, `timepicker` and `link` (which uses the WP link manager)

* added ability to add default value for certain field types

* added ability to set placeholder for certain fields

* updated the examples file

* rewrote the `upload` field to use the media manager from WordPress 3.5+. Note the `upload` field is now `readonly` by default (but can be set to `false` when you setup the field)

* updated JavaScript to be up to standard with coding standards and be fully compatible with jQuery 1.9+

* replaced chosen.js with select2.js

* reformat and clean up css file

* added ability for groups to display a description

* added ability to limit capabilities for entire groups using `required_cap`

* convert plugin class to singleton



## 0.7



* added the ability to have readonly fields with the new `readonly` paramater



## 0.6



* note: the plugin now requires WordPress 3.3+ (chiefly for the wysiwyg & datepicker fields)

* update/clean-up the examples file

* properly enqueue admin css for WP 3.3+

* added a filter for the `CUSTOM_METADATA_MANAGER_URL` constant

* fix fields not appearing when editing users in WP 3.3+ (props @FolioVision)

* now passing the `$value` for a `display_callback` (props @FolioVision)

* use the new `wp_editor()` function (since WP 3.3+) instead of `the_editor()` (now deprecated)

* wysiwyg fields are no longer cloneable (may be revisited in a future version)

* note: metaboxes that have a wysiwyg field will break when moved, this is not a bug per-se (may be revisited in a future version)

* password fields are now cloneable

* added filters for most of the plugin's internal variables

* now using WordPress' built-in jQuery UI for the datepicker field

* updated the screenshots

* updated the instructions in readme.txt



## 0.5.7



* pass additional params for `display_callback`



## 0.5.6



* fix bugs with datepicker



## 0.5.5



* remove all whitespace

* fix some bugs with the tinymce field



## 0.5.4



* fix display_callback for fields



## 0.5.3



* removed php opening shorttags `` in favor of regular ` $group_slug, // Label for the group

	'context' => 'normal', // (post only)

	'priority' => 'default', // (post only)

	'autosave' => false, // (post only) Should the group be saved in autosave? NOT IMPLEMENTED YET!

	'exclude' => '', // see below for details

	'include' => '', // see below for details

);

```



### Adding Metadata Fields



`x_add_metadata_field( $slug, $object_types, $args );`



#### Parameters



* `$slug` (string) The key under which the metadata will be stored. For post_types, prefix the slug with an underscore (e.g. `_hidden`) to hide it from the the Custom Fields box.

* `$object_types` (string|array) The object types to which this field should be added. Supported: post, page, any custom post type, user, comment.



####  Options and Overrides



```php

$args = array(

	'group' => '', // The slug of group the field should be added to. This needs to be registered with x_add_metadata_group first.

	'field_type' => 'text', // The type of field; 'text', 'textarea', 'password', 'checkbox', 'radio', 'select', 'upload', 'wysiwyg', 'datepicker', 'taxonomy_select', 'taxonomy_radio'

	'label' => '', // Label for the field

	'description' => '', // Description of the field, displayed below the input

	'values' => array(), // Values for select and radio buttons. Associative array

	'display_callback' => '', // Callback to custom render the field

	'sanitize_callback' => '', // Callback to sanitize data before it's saved

	'display_column' => false, // Add the field to the columns when viewing all posts

	'display_column_callback' => '', // Callback to render output for the custom column

	'required_cap' => '', // The cap required to view and edit the field

	'exclude' => '', // see below for details

	'include' => '', // see below for details

	'multiple' => false, // true or false, can the field be duplicated with a click of a button?

	'readonly' => false, // makes the field be readonly (works with text, textarea, password, upload and datepicker fields)

);

```



####  Include / Exclude



You can exclude fields and groups from specific object. For example, with the following, field-1 will show up for all posts except post #123:



```php

$args = array(

	'exclude' => 123

);

x_add_metadata_field( 'field-1', 'post', $args );

```



Alternatively, you can limit ("include") fields and groups to specific objects. The following will ''only'' show group-1 to post #456:



```php

$args = array(

	'include' => 123

);

x_add_metadata_group( 'group-1', 'post', $args );

```



You can pass in an array of IDs:



```php

$args = array(

	'include' => array( 123, 456, 789 );

);

```



With multiple object types, you can pass in an associative array:



```php

$args = array(

	'exclude' => array(

		'post' => 123,

		'user' => array( 123, 456, 789 )

	)

);

```

You can also pass in a callback to programattically include or exclude posts:



```php

$args = array(

	'exclude' => function( $thing_slug, $thing, $object_type, $object_id, $object_slug ) {

		// exclude from all posts that are in the aside category.

		return in_category( 'aside', $object_id );

	}

);

```



```php

$args = array(

	'include' => function( $thing_slug, $thing, $object_type, $object_id, $object_slug ) {

		// include for posts that are not published.

		$post = get_post( $object_id );

		return 'publish' != $post->post_status;

	}

);

```



# Examples



For examples, please see the [custom_metadata_examples.php](https://github.com/jkudish/custom-metadata/blob/master/custom_metadata_examples.php) file included with the plugin. Add a constant to your wp-config.php called `CUSTOM_METADATA_MANAGER_DEBUG` with a value of `true` to see it in action:



`define( 'CUSTOM_METADATA_MANAGER_DEBUG', true );`



# License



This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.



This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.



You should have received a copy of the GNU General Public License along with this program; if not, write to:



Free Software Foundation, Inc.

51 Franklin Street, Fifth Floor,

Boston, MA

02110-1301, USA.