CMB2 Field Type: Select2

Description

Select2 field type for CMB2.

This plugin gives you two additional field types based on Select2:

The pw_select field acts much like the default select field. However, it adds typeahead-style search allowing you to quickly make a selection from a large list
The pw_multiselect field allows you to select multiple values with typeahead-style search. The values can be dragged and dropped to reorder

Installation

You can install this field type as you would a WordPress plugin:

Download the plugin
Place the plugin folder in your /wp-content/plugins/ directory
Activate the plugin in the Plugin dashboard

Alternatively, you can include this field type within your plugin/theme. The path to front end assets (JS/CSS) can be filtered using pw_cmb2_field_select2_asset_path. See an example where we load assets from the current active theme.

Usage

pw_select - Select box with with typeahead-style search. Example:

$cmb->add_field( array(
	'name'    => 'Cooking time',
	'id'      => $prefix . 'cooking_time',
	'desc'    => 'Cooking time',
	'type'    => 'pw_select',
	'options' => array(
		'5'  => '5 minutes',
		'10' => '10 minutes',
		'30' => 'Half an hour',
		'60' => '1 hour',
	),
) );

pw_multiselect - Multi-value select box with drag and drop reordering. Example:

$cmb->add_field( array(
	'name'    => 'Ingredients',
	'id'      => $prefix . 'ingredients',
	'desc'    => 'Select ingredients. Drag to reorder.',
	'type'    => 'pw_multiselect',
	'options' => array(
		'flour'  => 'Flour',
		'salt'   => 'Salt',
		'eggs'   => 'Eggs',
		'milk'   => 'Milk',
		'butter' => 'Butter',
	),
) );

Placeholder

You can specify placeholder text through the attributes array. Example:

$cmb->add_field( array(
	'name'    => 'Ingredients',
	'id'      => $prefix . 'ingredients',
	'desc'    => 'Select this recipes ingredients.',
	'type'    => 'pw_multiselect',
	'options' => array(
		'flour'  => 'Flour',
		'salt'   => 'Salt',
		'eggs'   => 'Eggs',
		'milk'   => 'Milk',
		'butter' => 'Butter',
	),
	'attributes' => array(
		'placeholder' => 'Select ingredients. Drag to reorder'
	),
) );

Custom Select2 configuration and overriding default configuration options

You can define Select2 configuration options using HTML5 data-* attributes. It's worth reading up on the available options over on the Select2 website. Example:

$cmb->add_field( array(
	'name'    => 'Ingredients',
	'id'      => $prefix . 'ingredients',
	'desc'    => 'Select ingredients. Drag to reorder.',
	'type'    => 'pw_multiselect',
	'options' => array(
		'flour'  => 'Flour',
		'salt'   => 'Salt',
		'eggs'   => 'Eggs',
		'milk'   => 'Milk',
		'butter' => 'Butter',
	),
	'attributes' => array(
		'data-maximum-selection-length' => '2',
	),
) );

Helper functions

You may want to populate the options array dynamically. Common use cases include listing out posts and taxonomy terms. I've written a number of generic helper functions which can be used to return a CMB2 style array for both posts and terms.

Limitations/known issues

If you’d like to help out, pull requests are more than welcome!

This field does not work well as a repeatable field within a repeatable group.
Yoast SEO also loads Select2. Currently a version behind, there is an issue with the previous version of Select2 and it's ability to position the dropdown relative to the field.

mustardBees/cmb-field-select2