select2-for-wordpress

This library simplifies adding autocomplete form fields based on select2 library to WordPress plugins and themes.

Installation

Library can be installed using composer.

First you need to add our repository to the list of recognized repositories in composer.json:

"repositories": [
    {
        "type": "vcs",
        "url": "https://github.com/wpwhitesecurity/select2-wpwhitesecurity"
    }
]

Next add the library to your dependencies by running:

composer require wpwhitesecurity/select2-wpwhitesecurity

Usage

First you need to make sure the library is loaded. Including the composer autoloader is sufficient:

// Require Composer autoloader if it exists.
if ( file_exists( YOUR_PLUGIN_PATH . '/vendor/autoload.php' ) ) {
    require_once YOUR_PLUGIN_PATH . '/vendor/autoload.php';
}

Next step is initialising the library with a URL to the library folder. It will be used to load required JavaScript files and CSS stylesheets on the front-end.

if ( class_exists( '\S24WP' ) ) {
    \S24WP::init( YOUR_PLUGIN_BASE_URL . 'vendor/wpwhitesecurity/select2-wpwhitesecurity' );
}

The autocomplete input itself is rendering using function \S24WP::insert(). It accepts a single attribute, and array of configuration parameters:

• name (string) - Name of the select field. Needs to end with [] when multiple values are allowed.
• id (string) - ID of the select field. Optional, defaults to wpw-select2-{number}.
• data (array) - Data to populate the select field with. Each item needs to be an associative array with fields id and text. See Select2 data format documentation.
• data-type (string) - This attribute can be used instead of data. Supported values are user, role or post. The items are either pre-loaded locally (for example roles) or fetched from a remote (AJAX) source (users and posts).
• placeholder (string) - Placeholder text.
• width (int) - Width of the element in pixels.
• multiple (bool) - If true, multiple values can be selected.
• min_chars (int) - Minimum number of characters to type before searching. Only applies to
• selected (string[]|int[]) - Selected value or an array of values. Doesn't support comma separated list.
• extra_js_callback (callable) - PHP function to call after the JavaScript select2 init function is printed. It should print additional JS if necessary, using s2 as reference to the current select2 instance.
• remote_source_threshold (int) - Only use when data-type is set to user. Users are loaded using AJAX only if number of users exceeds given threshold. Otherwise the users are pre-loaded locally.

Example

\S24WP::insert(
    array(
        'placeholder'             => esc_html__( 'select user(s)', 'admin-notices-manager' ),
        'name'                    => 'visibility["show-users"][]',
        'width'                   => 500,
        'data-type'               => 'user',
        'multiple'                => true,
        'extra_js_callback'       => function ( $element_id ) {
            echo 'window.anm_settings.append_select2_events( s2 );';
        },
        'remote_source_threshold' => 300,
    )
);