[wordpress]后台自定义菜单字段和使用wordpress color picker

Wordpress Version 4.4.2

参考链接

1. 插件使用wordpress color picker:Add A New Color Picker To WordPress
2. 后台菜单自定义字段参考插件:wp-menu-item-custom-fields

3. How do I implement the Wordpress Iris picker into my plugin on the front-end?

4. New Color Picker in WP 3.5

先安装后台自定义菜单插件到wp-content/plugins下，并启用它。

wp-menu-item-custom-fields 的Readme.md中的一部分翻译。

## 安装 ##

### 作为普通插件 ###
1. 上传 `menu-item-custom-fields` 到 `/wp-content/plugins/` 目录下
1.  通过 wordpress的 'Plugins' 菜单，激活这个插件

### 作为你插件/theme 的类库###
简单复制 `menu-item-custom-fields` 文件到你的插件目录和引入这个插件的主要文件, 如:

`
require_once dirname( __FILE__ ) . '/menu-item-custom-fields/menu-item-custom-fields.php';
`

### 使用 ###

复制(或者自定义)  和   在这个插件的doc / 找到 `menu-item-custom-fields-example.php` 文件引入到你的 plugin/theme下。

我个人是直接使用，直接从这个插件的doc复制到这个插件的目录下。

menu-item-custom-fields-example.php 的code，我在init()方法，添加了引入js,并在_fields()方法的输出html的input 的class 添加了"menu-custom-color"

 <?php
 /**
  * Menu item custom fields example
  *
  * Copy this file into your wp-content/mu-plugins directory.
  *
  * @package Menu_Item_Custom_Fields_Example
  * @version 0.2.0
  * @author Dzikri Aziz <kvcrvt@gmail.com>
  *
  *
  * Plugin name: Menu Item Custom Fields Example
  * Plugin URI: https://github.com/kucrut/wp-menu-item-custom-fields
  * Description: Example usage of Menu Item Custom Fields in plugins/themes
  * Version: 0.2.0
  * Author: Dzikri Aziz
  * Author URI: http://kucrut.org/
  * License: GPL v2
  * Text Domain: menu-item-custom-fields-example
  */

 /**
  * Sample menu item metadata
  *
  * This class demonstrate the usage of Menu Item Custom Fields in plugins/themes.
  *
  * @since 0.1.0
  */
 class Menu_Item_Custom_Fields_Example {

     /**
      * Holds our custom fields
      *
      * @var    array
      * @access protected
      * @since  Menu_Item_Custom_Fields_Example 0.2.0
      */
     protected static $fields = array();

     /**
      * Initialize plugin
      */
     public static function init() {
         add_action( 'wp_nav_menu_item_custom_fields', array( __CLASS__, '_fields' ), 10, 4 );
         add_action( 'wp_update_nav_menu_item', array( __CLASS__, '_save' ), 10, 3 );
         add_filter( 'manage_nav-menus_columns', array( __CLASS__, '_columns' ), 99 );

         //plugin use js add at 2016-04-06 by wakasann
         wp_enqueue_script( 'jquery' );
         wp_enqueue_style( 'wp-color-picker' );
         wp_enqueue_script(
         'iris',
         admin_url( 'js/iris.min.js' ),
         array( 'jquery-ui-draggable', 'jquery-ui-slider', 'jquery-touch-punch' ),
         false,
         1
     );
         wp_enqueue_script( 'wp-menu-custom-js', plugin_dir_url( __FILE__ ) . 'js/custom.js', array(), '', true );
         //use js end
         self::$fields = array(
             'field-background' => __( 'Menu Background', 'menu-item-custom-fields-example' ),
         );
     }

     /**
      * Save custom field value
      *
      * @wp_hook action wp_update_nav_menu_item
      *
      * @param int   $menu_id         Nav menu ID
      * @param int   $menu_item_db_id Menu item ID
      * @param array $menu_item_args  Menu item data
      */
     public static function _save( $menu_id, $menu_item_db_id, $menu_item_args ) {
         if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
             return;
         }

         check_admin_referer( 'update-nav_menu', 'update-nav-menu-nonce' );

         foreach ( self::$fields as $_key => $label ) {
             $key = sprintf( 'menu-item-%s', $_key );

             // Sanitize
             if ( ! empty( $_POST[ $key ][ $menu_item_db_id ] ) ) {
                 // Do some checks here...
                 $value = $_POST[ $key ][ $menu_item_db_id ];
             }
             else {
                 $value = null;
             }

             // Update
             if ( ! is_null( $value ) ) {
                 update_post_meta( $menu_item_db_id, $key, $value );
             }
             else {
                 delete_post_meta( $menu_item_db_id, $key );
             }
         }
     }

     /**
      * Print field
      *
      * @param object $item  Menu item data object.
      * @param int    $depth  Depth of menu item. Used for padding.
      * @param array  $args  Menu item args.
      * @param int    $id    Nav menu ID.
      *
      * @return string Form fields
      */
     public static function _fields( $id, $item, $depth, $args ) {
         foreach ( self::$fields as $_key => $label ) :
             $key   = sprintf( 'menu-item-%s', $_key );
             $id    = sprintf( 'edit-%s-%s', $key, $item->ID );
             $name  = sprintf( '%s[%s]', $key, $item->ID );
             $value = get_post_meta( $item->ID, $key, true );
             $class = sprintf( 'field-%s', $_key );
             ?>
                 <p class="description description-wide <?php echo esc_attr( $class ) ?>">
                     <?php printf(
                         '<label for="%1$s">%2$s<br /><input type="text" id="%1$s" class="widefat %1$s menu-custom-color" name="%3$s" value="%4$s" /></label>',
                         esc_attr( $id ),
                         esc_html( $label ),
                         esc_attr( $name ),
                         esc_attr( $value )
                     ) ?>
                 </p>
             <?php
         endforeach;
     }

     /**
      * Add our fields to the screen options toggle
      *
      * @param array $columns Menu item columns
      * @return array
      */
     public static function _columns( $columns ) {
         $columns = array_merge( $columns, self::$fields );

         return $columns;
     }
 }
 Menu_Item_Custom_Fields_Example::init();

custom.js

/**
 * custom.js
 * Custom JS code required by the plugin
 */
jQuery(document).ready(function ($) {

    'use strict';
    $('.menu-custom-color').iris();
});

最终效果是：

嘻嘻，第一次成功，还需完善前台读取自定义字段呢。

------------------------

参考了参考链接的3,4两点，将菜单自定义颜色替换了一下

将menu-item-custom-fields-example.php文件中的init()方法中的导入js修改为

 //plugin use js add at 2016-04-06 by wakasann
         wp_enqueue_script( 'jquery' );
         wp_enqueue_style( 'wp-color-picker' );
         wp_enqueue_script(
         'iris',
         admin_url( 'js/iris.min.js' ),
         array( 'jquery-ui-draggable', 'jquery-ui-slider', 'jquery-touch-punch' ),
         false,
         1
     );
         wp_enqueue_script(
         'wp-color-picker',
         admin_url( 'js/color-picker.min.js' ),
         array( 'iris' ),
         false,
         1
     );

         wp_enqueue_script( 'wp-menu-custom-js', plugin_dir_url( __FILE__ ) . 'js/custom.js', array(), '', true );
         //use js end

custom.js 更正为:

 /**
  * custom.js
  * Custom JS code required by the plugin
  */
 jQuery(document).ready(function ($) {

     'use strict';
     var myOptions = {
       // you can declare a default color here,
       // or in the data-default-color attribute on the input
       defaultColor: false,
       // a callback to fire whenever the color changes to a valid color
       change: function(event, ui){},
       // a callback to fire when the input is emptied or an invalid color
       clear: function() {},
       // hide the color picker controls on load
       hide: true,
       // show a group of common colors beneath the square
       // or, supply an array of colors to customize further
       palettes: true
   };
     $('.menu-custom-color').wpColorPicker(myOptions);
 });

之后的效果是:

在当前的代码中，获取自定义字段：使用get_post_meta()方法，而生成字段的格式是 menu-item-{$field},eg:menu-item-field-background

在自定义的Walker_Nav_Menu中，可以通过与下面类似的代码进行获取自定义字段。在数据库中，存放在wp_postmeta表中。

$this->field_background = get_post_meta( $item->ID, 'menu-item-field_background',         true );