我有两个具有父类别和子类别的数组,每个数组都出现在一个选择列表中,如何使子类别仅显示其父类别中的项目？
<?PHP $carMakes = array( 'show_option_all' => '','show_option_none' => ('All Makes'),'orderby' => 'ID','order' => 'ASC','show_count' => 0,'hide_empty' => 1,'child_of' => 25,'exclude' => 0,'echo' => 1,'selected' => 0,'hierarchical' => 0,'name' => 'cat','id' => '','class' => 'postform','depth' => 0,'tab_index' => 0,'taxonomy' => 'category','hide_if_empty' => false ); ?> <?PHP $carModels = array( 'name' => 'subcat','hierarchical' => 1,'parent' => get_cat_id('model'),'show_option_none' => ('All Models'),'hide_empty' => 0 ); ?> <?PHP wp_dropdown_categories($carMakes); ?> <?PHP wp_dropdown_categories($carModels); ?>
例如,只需要展示属于汽车的汽车模型
Make=Toyota Model=Supra
Model=Corolla
Model=Tundra
以下是类别结构的示例
Make (parent category)
-Toyota
-Nissan
-Mazda
-Ford
Model (parent category)
-Supra
-Skyline
-Mustang
-Rx7
-Corolla
一直想使用Ajax对链式选择进行练习,所以,在这里我们去;)
这是一个完整的插件,应该安装在wp-content / plugins / your-plugin-name文件夹中.由三个文件组成,插件本身,Javascript文件和Ajax加载器映像.
<?PHP if( class_exists( 'BRSFL_Chained_Selection' ) ) { // Parameters: ( $cat_id,$dropdown_text ) BRSFL_Chained_Selection::print_cats( 1,'All Makes' ); } ?>
另外,根据需要调整两次调用wp_dropdown_categories.查看代码注释以获取详细信息.
子类别下拉列表会根据类别下拉列表中的更改进行修改：
链-categories.PHP
<?PHP /** * Plugin Name: Chained Categories * Plugin URI: https://stackoverflow.com/q/15748968/1287812 * Description: Demonstration of chained categories with Ajax. * Plugin structure based on <a href="https://gist.github.com/3804204">Plugin Class Demo</a>,by Thomas Scholz. * Use the dropdowns in the theme with this PHP method call: BRSFL_Chained_Selection::print_cats(); * Author: Rodolfo Buaiz * Author URI: http://wordpress.stackexchange.com/users/12615/brasofilo */ add_action( 'plugins_loaded',array ( BRSFL_Chained_Selection::get_instance(),'plugin_setup' ) ); class BRSFL_Chained_Selection { /** * Plugin instance. * * @see get_instance() * @type object */ protected static $instance = NULL; /** * URL to this plugin's directory. * * @type string */ public $plugin_url = ''; /** * Path to this plugin's directory. * * @type string */ public $plugin_path = ''; /** * Access this plugin’s working instance * * @wp-hook plugins_loaded * @since 2012.09.13 * @return object of this class */ public static function get_instance() { NULL === self::$instance and self::$instance = new self; return self::$instance; } /** * Used for regular plugin work. * * @wp-hook plugins_loaded * @since 2012.09.10 * @return void */ public function plugin_setup() { $this->plugin_url = plugins_url( '/',__FILE__ ); $this->plugin_path = plugin_dir_path( __FILE__ ); $this->load_language( 'chainedselections' ); add_action( 'wp_enqueue_scripts',array( $this,'script_enqueuer' ) ); add_action( 'wp_ajax_custom_query','custom_query' ) ); add_action( 'wp_ajax_nopriv_custom_query','custom_query' ) ); } /** * Constructor. Intentionally left empty and public. * * @see plugin_setup() * @since 2012.09.12 */ public function __construct() {} /** * Enqueue frontend scripts */ public function script_enqueuer() { wp_register_script( 'ajax-quote',plugin_dir_url( __FILE__ ) . '/ajax.js',array( 'jquery' ) ); wp_enqueue_script( 'ajax-quote' ); wp_localize_script( 'ajax-quote','wp_ajax',array( 'ajaxurl' => admin_url( 'admin-ajax.PHP' ),'ajaxnonce' => wp_create_nonce( 'ajax_chained_selection_validate' ),'icon' => plugin_dir_url( __FILE__ ) . '/ajax-loader.gif' ) ); } /** * Ajax create sub-categories dropdown */ public function custom_query() { // Security check_ajax_referer( 'ajax_chained_selection_validate','security' ); // Check if jQuery posted the data if( !isset( $_POST[ 'chained_subcat_id' ] ) ) return false; // Adjust parameters $carMakes = array( 'show_option_all' => '','show_option_none' => 'All ' . $_POST[ 'chained_subcat_name' ],'hide_empty' => 0,'child_of' => $_POST[ 'chained_subcat_id' ],'name' => 'chained-subcontainer','depth' => 1,'hide_if_empty' => false ); // Print sub-categories wp_dropdown_categories( $carMakes ); exit(); } /** * Loads translation file. * * Accessible to other classes to load different language files (admin and * front-end for example). * * @wp-hook init * @param string $domain * @since 2012.09.11 * @return void */ public function load_language( $domain ) { $locale = apply_filters( 'plugin_locale',get_locale(),$domain ); // Load translation from wp-content/languages if exist load_textdomain( $domain,WP_LANG_DIR . $domain . '-' . $locale . '.mo' ); // Load regular plugin translation load_plugin_textdomain( $domain,FALSE,$this->plugin_path . '/languages' ); } /** * Print the dropdown in the frontend */ public static function print_cats( $cat_id,$dropdown_text ) { // Adjust parameters $carMakes = array( 'show_option_all' => '','show_option_none' => $dropdown_text,'child_of' => $cat_id,'name' => 'chained-categories','hide_if_empty' => false ); // Print categories wp_dropdown_categories( $carMakes ); // Empty dropdown for sub-categories echo '<div id="chained-subcontainer"> <select name="chained-subcategories" id="chained-subcategories"> <option value="">- Select a category first -</option> </select> </div>'; } }
ajax.js
jQuery( document ).ready( function( $)
{
var data = {
action: 'custom_query',security: wp_ajax.ajaxnonce
};
$( "#chained-categories" ).on( "change",function( e )
{
// Add specific data to the variable,used to query the sub-categories
data[ 'chained_subcat_id' ] = $( this ).val();
data[ 'chained_subcat_name' ] = $(
'#chained-categories option[value='
+ $( this ).val()
+ ']'
).text();
// A sub-category was selected
if( $( this ).val() > 0 )
{
// Ajax loader icon
$( '#chained-subcontainer' ).html( '<img src="' + wp_ajax.icon + '">' );
// Ajax call
$.post(
wp_ajax.ajaxurl,data,// No error checking is being done with the response
function( response )
{
$( '#chained-subcontainer' ).html( response );
}
);
}
// No selection,show default
else
{
$( '#chained-subcontainer' ).html( '<select name="chained-subcategories" id="chained-subcategories"><option value="">- Select a category first -</option></select>' );
}
});
} );
Ajax的loader.gif