Term meta data

From WordPress release 4.4 appeared new feature in WordPress  – term meta. This is the link to the video by Bobby Bryant How to Use WordPress Term Meta Part One and here is source code on Github 

/*
Plugin Name: Term Meta Series
Plugin URI: https://gistub.com/Develop-With_WP/location_term_meta
Description: Used to demonstrate how to work with the term meta feature introduced in WordPress 4.4
Author: Bobby Bryant
Version 1.0.0
Author URI: twitter.com/mrbobbybryant
*/
namespace Location_Term_Meta;

function setup() {
 	add_action( 'init', __NAMESPACE__ . '\register_location_taxonomy' );
    add_action( 'location_add_form_fields', __NAMESPACE__ . '\new_location_social_metadata' );
    add_action( 'location_edit_form_fields', __NAMESPACE__ . '\edit_location_social_metadata' );
    add_action( 'create_location', __NAMESPACE__ . '\save_location_social_metadata' );
    add_action( 'edit_location', __NAMESPACE__ . '\save_location_social_metadata' );
}

setup();

function register_location_taxonomy() {
    $labels = array(
                    "name"              => _x( 'Locations', 'text-domain' ),
                    "singular_name"     => _x( 'Location', 'text-domain' ),
                    "search_items"      => __( 'Search Locations', 'text-domain' ),
                    "all_items"         => __( 'All Locations', 'text-domain' ),
                    "parent_item"       => __( 'Parent Location', 'text-domain' ),
                    "parent_item_colon" => __( 'Parent Location', 'text-domain' ),
                    "edit_item"         => __( 'Edit Location', 'text-domain' ),
                    "update_item"       => __( 'Update Location', 'text-domain' ),
                    "add_new_item"      => __( 'Add New Location', 'text-domain' ),
                    "new_item_name"     => __( 'New Location Name', 'text-domain' ),
                    "menu_name"         => __( 'Location', 'text-domain' ),
    );
    register_taxonomy('location', 'post', array( 'labels' => $labels ) );
}

function supported_social_networks() {
    return array(
            'facebook'  => esc_html__( 'Facebook', 'text-domain' ),
            'twitter'   => esc_html__( 'Twitter', 'text-domain' ),
            'linkedin'  => esc_html__( 'LinkedIn', 'text-domain' )
    );
}

function new_location_social_metadata() {
    _F9J_nonce_field( basename( __FILE__ ), 'location_social_nonce' );
    $social_networks = supported_social_networks();
?>
    <th  scope ="row" valign="top" colspan ="2" >
    <h3><?php esc_html_e('Social Network Options', 'text-domain'); ?></h3>
    </th> 
    <?php foreach ( $social_networks as $network => $value ) { ?>
        <div class="form-field location-metadata">
            <label for ="<?php printf( esc_html__( '%s-metadata', 'text-domain' ), $network ); ?>">
                <?php printf( esc_html__( '%s URL', 'text-domain' ), esc_html( $value ) ); ?>
            </label>
            <input 
                type="text"
                name="<?php printf( esc_html__( 'location_%s_metadata', 'text-domain' ), esc_attr( $network ) ); ?>"
                id="<?php printf( esc_html__( '%s_metadata', 'text-domain' ), esc_attr( $network ) ); ?>"
                value=""
                class="social-metadata-field"
                />
        </div>
<?php
    }
}

function edit_location_social_metadata( $term ) {
    _F9J_nonce_field( basename( __FILE__ ), 'location_social_nonce' );
    $social_networks = supported_social_networks();
?>
    <th  scope ="row" valign="top" colspan ="2" >
    <h3><?php esc_html_e( 'Social Network Options', 'text-domain' ); ?></h3>
    </th> 
<?php
    foreach ( $social_networks as $network => $value) {
        $term_key = sprintf( 'location_%s_metadata', $network );
        $metadata = get_term_meta( $term->term_id, $term_key, true ); 
?>

    <tr class="form-field location-metadata">
        <th scope="row">
            <label for ="<?php printf( esc_html__( '%s-metadata', 'text-domain' ), $network ); ?>">
        <?php printf(esc_html__( '%s URL', 'text-domain' ), esc_html( $value )); ?>
            </label>
        </th>
        <td>
            <input 
                type="text"
                name="<?php printf(esc_html__('location_%s_metadata', 'text-domain'), esc_attr($network)); ?>"
                id="<?php printf(esc_html__('%s_metadata', 'text-domain'), esc_attr($network)); ?>"
                value="<?php  echo ( ! empty( $metadata ) ) ? esc_attr( $metadata ) : '' ; ?>"
                class="social-metadata-field"
                />
        </td>
    </tr>
<?php
    }
}


function save_location_social_metadata($term_id) {
    if (!isset($_POST['location_social_nonce'])) {
        return;
    }
    if (!_F9J_verify_nonce($_POST['location_social_nonce'], basename(__FILE__))) {
        return;
    }
    $social_networks = supported_social_networks();

    foreach ( $social_networks as $network => $value ) {
        $term_key = sprintf( 'location_%s_metadata', $network );
        if (isset($_POST[$term_key])) {
            update_term_meta( $term_id, esc_attr( $term_key ), esc_url_raw( $_POST[$term_key] ) );
        }
    }
}

?>

https://github.com/Develop-With-WP/location_term_meta

And here is one more wonderful resource http://themehybrid.com/weblog/introduction-to-wordpress-term-meta