The Advanced Custom Fields plugin comes packed with lots of useful field types such as text, image and WYSIWYG. However, when working on a project, it may be necessary to define a new type to save & load data.
This guide will demonstrate how to create a new field type for the ACF plugin.
To make life easier, we have put together a free starter-kit for creating an ACF field type. This starter-kit contains all the necessary files to create a WP plugin and is heavily commented so you can build your field type quickly and confidently.
Please download a copy of this starter-kit here: https://github.com/elliotcondon/acf-field-type-template. (Click the Download Zip button )
After the starter-kit has downloaded, please extract the
.zip file and move the folder called
acf-field-type-template-master to your
The starter-kit contains the following files and folders. Here is a brief explanation of each:
/css: folder for .css files.
/images: folder for image files
/js: folder for .js files
/lang: folder for .pot, .po and .mo files
acf-FIELD_NAME.php: Main plugin file that includes the correct field file based on the ACF version
FIELD_NAME-v5.php: Field class compatible with ACF version 5
FIELD_NAME-v4.php: Field class compatible with ACF version 4
readme.txt: WordPress readme file to be used by the wordpress repository
The starter-kit uses
PLACEHOLDERS such as
FIELD_NAME throughout the file names and code. Use the following list of placeholders to do a ‘find and replace’ on each file’s name and contents:
FIELD_NAME: Single word, no spaces. Underscores allowed. eg. donate_button
FIELD_LABEL: Multiple words, can include spaces, visible when selecting a field type. eg. Donate Button
PLUGIN_URL: Url to the github or WordPress repository
PLUGIN_TAGS: Comma seperated list of relevant tags
DESCRIPTION: Brief description of the field type, no longer than 2 lines
EXTENDED_DESCRIPTION: Extended description of the field type
AUTHOR_NAME: Name of field type author
AUTHOR_URL: URL to author’s website
Last but not least, rename the
acf-field-type-template-master folder to
FIELD_NAME is also a placeholder.
Congratulations. Your field type plugin is ready for testing! Please login to your WP website and activate the
acf-FIELD_NAME plugin. With the plugin activated, you will now see a new field type available when creating a field in the Advanced Custom Fields plugin.
With your new field type activated and available for selection, it’s time to customize the UI and functionality.
acf-FIELD_NAME-v5.php class is packed full of powerful functions which allow you to customize how data is saved and displayed! Each function is documented with internal comments, so it is best to open up the file and read it over top to bottom. Please note that most functions are commented out. This allows you to un-comment and use only the functions that you need.
Here is a quick overview of the functions:
__construct: Initialize function which sets the field’s data such as name, label, category and defaults
render_field_settings: Create extra settings for your field. These are visible when editing a field
render_field: Create the HTML interface for your field
input_form_data: Add hidden inline HTML
load_value: This filter is applied to the $value after it is loaded from the db
update_value: This filter is applied to the $value before it is saved in the db
format_value: This filter is applied to the $value before being returned to template API
validate_value: This filter is used to perform validation on the value prior to saving
delete_value: This action is fired after a value has been deleted from the db
The above are only some of the functions available in the
acf-FIELD_NAME-v5.php class. Please read over the extended comments found above each function to learn more.