如何在wordpress插件中保存選擇選項下拉列表

Question

我擁有以下代碼，它是從WordPress代碼中獲取關於如何保存簡單文本輸入字段的。它工作正常。但我想現在保存一個選擇下拉列表，並不能找出我在這裏失蹤。它似乎保存了我第一次從下拉菜單中選擇保存，但是當我嘗試編輯值以選擇另一個選項並保存時，它從不保存。

我的其他queston就是爲什麼沒有被打印到當我運行屏幕值

testing value saved: <?=esc_attr(get_option('location_one_option')); ?> 

當前插件代碼如下：

// create custom plugin settings menu 
function sidebar_posts_create_menu() { 
    //create new top-level menu 
    add_menu_page('Sidebar Posts', 'Sidebar Post Settings', 'administrator', __FILE__, 'sidebar_posts_settings_page'); 

    //call register settings function 
    add_action('admin_init', 'register_sidebar_posts_settings'); 
} 
add_action('admin_menu', 'sidebar_posts_create_menu'); 

//register our settings 
function register_sidebar_posts_settings() { 
    //register our settings 
    register_setting('sidebar-posts-settings-group', 'location_one_option'); 
    register_setting('sidebar-posts-settings-group', 'new_option_name'); 
} 

//register settings page view 
function sidebar_posts_settings_page() { 
    ?> 
    <div class="wrap"> 
     <h1>Sidebar Posts Settings</h1> 
     <p>Select up to six posts to show in six different locations on the sidebar. Have fun!</p> 

     <form method="post" action="options.php"> 
      <?php settings_fields('sidebar-posts-settings-group'); ?> 
      <?php do_settings_sections('sidebar-posts-settings-group'); ?> 
      <table class="form-table"> 
       <tr valign="top"> 
        <th scope="row">New Option Name</th> 
        <td><input type="text" name="new_option_name" value="<?php echo esc_attr(get_option('new_option_name')); ?>" /></td> 
       </tr> 
<!--the above simple text field saves the data perfectly--> 

       <?php 
       $your_query = new WP_Query('posts_per_page=-1'); ?> 
           <label>Location One Post</label><br /> 
      <select name="location_one_option"> 
       <option value="" selected="selected">Select a post</option> 
       <?php while ($your_query->have_posts()) : $your_query->the_post(); ?> 
       <option value="<?=esc_attr(get_option('location_one_option')); ?>" <?php selected(get_option('location_one_option'), get_option('location_one_option')); ?>> 
        <?=the_title(); ?> 
       </option> 
       <? endwhile; ?> 
      </select> 
      <? wp_reset_postdata(); ?><br /><br /> 
      testing value saved: <?=esc_attr(get_option('location_one_option')); ?> 

      </table> 
      <?php submit_button(); ?> 
     </form> 
    </div> 
<?php } 

Answer 1

使用此功能，這只是一個例子在wordpress插件中保存選擇選項下拉菜單，您可以根據需要使用它。

例1

class DropdownOptionSetting { 
    private $dropdown_option_setting_options; 

    public function __construct() { 
     add_action('admin_menu', array($this, 'dropdown_option_setting_add_plugin_page')); 
     add_action('admin_init', array($this, 'dropdown_option_setting_page_init')); 
    } 

    public function dropdown_option_setting_add_plugin_page() { 
     add_options_page(
      'Dropdown Option Setting', // page_title 
      'Dropdown Option Setting', // menu_title 
      'manage_options', // capability 
      'dropdown-option-setting', // menu_slug 
      array($this, 'dropdown_option_setting_create_admin_page') // function 
     ); 
    } 

    public function dropdown_option_setting_create_admin_page() { 
     $this->dropdown_option_setting_options = get_option('dropdown_option_setting_option_name'); ?> 

     <div class="wrap"> 
      <h2>Dropdown Option Setting</h2> 
      <p></p> 
      <?php settings_errors(); ?> 

      <form method="post" action="options.php"> 
       <?php 
        settings_fields('dropdown_option_setting_option_group'); 
        do_settings_sections('dropdown-option-setting-admin'); 
        submit_button(); 
       ?> 
      </form> 
     </div> 
    <?php } 

    public function dropdown_option_setting_page_init() { 
     register_setting(
      'dropdown_option_setting_option_group', // option_group 
      'dropdown_option_setting_option_name', // option_name 
      array($this, 'dropdown_option_setting_sanitize') // sanitize_callback 
     ); 

     add_settings_section(
      'dropdown_option_setting_setting_section', // id 
      'Settings', // title 
      array($this, 'dropdown_option_setting_section_info'), // callback 
      'dropdown-option-setting-admin' // page 
     ); 

     add_settings_field(
      'dropdown_option_0', // id 
      'Dropdown Option', // title 
      array($this, 'dropdown_option_0_callback'), // callback 
      'dropdown-option-setting-admin', // page 
      'dropdown_option_setting_setting_section' // section 
     ); 
    } 

    public function dropdown_option_setting_sanitize($input) { 
     $sanitary_values = array(); 
     if (isset($input['dropdown_option_0'])) { 
      $sanitary_values['dropdown_option_0'] = $input['dropdown_option_0']; 
     } 

     return $sanitary_values; 
    } 

    public function dropdown_option_setting_section_info() { 

    } 

    public function dropdown_option_0_callback() { 
     ?> <select name="dropdown_option_setting_option_name[dropdown_option_0]" id="dropdown_option_0"> 
      <?php $selected = (isset($this->dropdown_option_setting_options['dropdown_option_0']) && $this->dropdown_option_setting_options['dropdown_option_0'] === 'option-one') ? 'selected' : '' ; ?> 
      <option value="option-one" <?php echo $selected; ?>>Option One</option> 
      <?php $selected = (isset($this->dropdown_option_setting_options['dropdown_option_0']) && $this->dropdown_option_setting_options['dropdown_option_0'] === 'option-two') ? 'selected' : '' ; ?> 
      <option value="option-two" <?php echo $selected; ?>>Option Two</option> 
      <?php $selected = (isset($this->dropdown_option_setting_options['dropdown_option_0']) && $this->dropdown_option_setting_options['dropdown_option_0'] === 'option-three') ? 'selected' : '' ; ?> 
      <option value="option-three" <?php echo $selected; ?>>Option Three</option> 
     </select> <?php 
    } 

} 
if (is_admin()) 
    $dropdown_option_setting = new DropdownOptionSetting(); 

如果你需要一個簡單的方法來做到這一點

示例檢索該值

$dropdown_option = get_option('dropdown_option_setting_option_name'); // Array 
$dropdown_value = $dropdown_option ['dropdown_option_0']; // Option value 

add_action('admin_init', 'Dropdown_settings_init'); 

function Dropdown_settings_init() { 
    register_setting('pluginPage', 'dropdown_settings'); 
    add_settings_section(
     'Dropdown_pluginPage_section', 
     __('Your section description', 'dropdown'), 
     'Dropdown_settings_section_callback', 
     'pluginPage' 
    ); 

    add_settings_field( 
     'select_field_0', 
     __('Settings field description', 'dropdown'), 
     'Dropdown_select_field_render', 
     'pluginPage', 
     'Dropdown_pluginPage_section' 
    ); 
} 


function Dropdown_select_field_render() { 
    $options = get_option('dropdown_settings'); 
    ?> 
    <select name='dropdown_settings[select_field_0]'> 
     <option value='1' <?php selected($options['select_field_0'], 1); ?>>Option 1</option> 
     <option value='2' <?php selected($options['select_field_0'], 2); ?>>Option 2</option> 
     <option value='3' <?php selected($options['select_field_0'], 3); ?>>Option 3</option> 
     <option value='4' <?php selected($options['select_field_0'], 4); ?>>Option 4</option> 
    </select> 
<?php 
} 


function Dropdown_settings_section_callback() { 
    echo __('This section description', 'dropdown'); 
} 


function Dropdown_options_page() { 
    ?> 
    <form action='options.php' method='post'> 
     <h2>Dropdown</h2> 
     <?php 
     settings_fields('pluginPage'); 
     do_settings_sections('pluginPage'); 
     submit_button(); 
     ?> 
    </form> 
    <?php 
} 
?>