$wp_taxonomies - 全局对象，它存储所有注册的分类法，包括默认分类法和自定义分类法get_post_types() - 让所有注册的帖子类型（包括默认和自定义）变得简单，下面分别是它们的用法示例。然后，您可以将它们组合起来，创建一个已注册的帖子类型列表，并提供一些条件，例如限制某些帖子类型。然后将其与注册的分类法进行比较。或者，您可以创建一个预设列表，其中包含帖子类型名称和注册的分类法，以进行比较。也许你有更好的方法。这是获取特定帖子类型的所有注册分类的示例。
<?php
// the taxonomy list is available in plugin, templates
// example, I put it it a plugin
global $wp_taxonomies;
// loop through all custom taxonomy and use preg_match() to test which category is matched to the post_type
// 1. assumed your post_type name is part of the category_name, for other checking logic, it is up to you and flexible
// 2. the $post_type is passed somewhere, here is a hard-coded example
$post_type = \'scusto\';
foreach ($wp_taxonomies as $key => $value) {
if( preg_match( "/{$post_type}*/", $key ) ) {
$registered_tax = $wp_taxonomies[$key]->name;
}
}
// then you have the registered category stored in $registered_tax for manipulation
?>
下面是获取所有注册帖子类型的函数<?php
// all registered post types output in an array
$post_types = get_post_types();
?>
编辑/更新2020年4月4日23:47这里是利用上述信息和一些ajax过滤器的ajax解决方案。你需要准备四件事。以下是以插件的形式编写的，因为它实际上来自我的插件。你可以转向其他形式来满足需要。作为演示，我省略了所有测试和验证，例如nonce。您可能需要在实际情况中添加它们。有关WordPress中AJAX的详细信息，请参阅Plugin Handbook虽然我为后端添加了ajax侦听器过滤器，但这只是表明它可以做到这一点。管理页面中没有js排队。如果需要，可以添加admin_enqueue_scripts 滤器
准备表单以向访问者显示接收ajax调用和操作按钮的javascript以进行交互并发送操作根据对您的问题的理解，这就是示例所做的：
显示3个列表，帖子类型列表，类别列表，帖子列表当选择帖子类型时，它更新类别列表当选择类别时，它更新帖子列表
class q363151_category_list {
public function __construct() {
//---------------------------------------
// ajax update list
// action name = update_cat_list, update_post_list
//---------------------------------------
// for frontend
// ajax update category list
add_action( \'wp_ajax_nopriv_update_cat_list\', array( $this, \'update_cat_list\' ) ); // non-logged in user
add_action( \'wp_ajax_update_cat_list\', array( $this, \'update_cat_list\' ) ); // logged in user
// for backend
add_action( \'admin_post_update_cat_list\', array( $this, \'update_cat_list\' ) );
add_action( \'admin_post_nopriv_update_cat_list\', array( $this, \'update_cat_list\' ) );
// ajax update post list
add_action( \'wp_ajax_nopriv_update_post_list\', array( $this, \'update_post_list\' ) ); // non-logged in user
add_action( \'wp_ajax_update_post_list\', array( $this, \'update_post_list\' ) ); // logged in user
// for backend
add_action( \'admin_post_update_post_list\', array( $this, \'update_post_list\' ) );
add_action( \'admin_post_nopriv_update_post_list\', array( $this, \'update_post_list\' ) );
// enqueue scripts
// add_action( \'admin_enqueue_scripts\', array( $this, \'scripts\' ), 1 );
add_action( \'wp_enqueue_scripts\', array( $this, \'scripts\' ) );
// output selection form
add_action( \'somewhere_in_your_theme\', array( $this, \'render_form_list\' ) );
}
// load scripts if any
public function scripts() {
wp_enqueue_script( \'q363147-ajax-post-list\', plugins_url( \'/ajax-post-list.js\', __FILE__ ), array( \'jquery\' ), \'t\' . time(), true );
// add ajax url
$config = array(
\'ajaxurl\' => admin_url(\'admin-ajax.php\'),
);
wp_localize_script(\'q363147-ajax-post-list\', \'q363147\', $config);
}
// receive action from ajax call
public function update_cat_list() {
global $wp_taxonomies;
// Error Handling
// check the nonce
$post_type = $_POST[\'post_type\'];
// get taxonomy for specific post type
$registered_tax = null;
switch ( $post_type ) {
case \'post\':
$tax_keyword = \'category\';
break;
default:
$tax_keyword = \'does_not_exist\';
break;
}
foreach ($wp_taxonomies as $key => $tax) {
if( preg_match( "/^{$tax_keyword}/", $key ) ) {
$registered_tax = $tax; // assumed 1 taxonomy
}
}
// output
// category list
// get terms(category name) for the found taxonomy
$category_options = $this->return_options( \'category\' );
if( ! empty( $registered_tax ) ) {
$terms = get_terms([
\'taxonomy\' => $registered_tax->name,
\'hide_empty\' => false,
]);
foreach ($terms as $key => $term) {
$category_options .= \'<option value="\' . $term->name . \'">\' . $term->name . \'</option>\';
}
}
// action here after checking
wp_send_json_success( array(
\'message\' => __( \'List data preparation completed\', \'q363147\' ),
\'post_type\' => $post_type,
\'tax_keyword\' => $tax_keyword,
\'taxonomy\' => ( $registered_tax->name ),
\'tax_query_var\' => ( $registered_tax->query_var ),
\'categories\' => $category_options,
// for debug
\'found_tax\' => preg_match( "/^{$tax_keyword}/", $key ),
\'post_data\' => $_POST,
) );
}
public function update_post_list() {
$post_type = $_POST[\'post_type\'];
$category = $_POST[\'selected_category\'];
$tax_query_var = $_POST[\'tax_query_var\'];
// $taxonomy = $_POST[\'taxonomy\']; // for later extension
// post query
$args = array(
\'post_type\' => $post_type,
\'category_name\' => $category,
);
$query = new WP_Query( $args );
$posts = $query->posts;
$post_options = $this->return_options( \'post\' );
foreach ($posts as $key => $post) {
$post_options .= \'<option value="\' . $post->ID . \'">\' . $post->post_title . \'</option>\';
}
// action here after checking
wp_send_json_success( array(
\'message\' => __( \'Post list preparation completed\', \'q363147\' ),
\'post_type\' => $post_type,
\'tax_query_var\' => $tax_query_var,
\'posts\' => $post_options,
// for debug
\'query_result\' => $query,
\'post_data\' => $_POST,
) );
}
// render form to frontend
public function render_form_list() {
// output your form here
$post_types = get_post_types();
// if you want to limit the following post type to be appeared
$allowed_to_search_arr = array(
\'post\' => \'Post\',
\'page\' => \'Page\', // if you turned it on for search, default is off
\'custom1\' => \'Custom post type1\',
\'custom2\' => \'Custom post type2\',
);
// post type list
$post_type_options = \'<option value="default">-- Post types --</option>\';
foreach ($post_types as $key => $post_type) {
if( array_key_exists( $post_type, $allowed_to_search_arr ) )
$post_type_options .= \'<option value="\' . $key . \'">\' . $post_type . \'</option>\';
}
// category list
$category_options = $this->return_options( \'category\' );
// post list
$post_options = $this->return_options( \'post\' );
$form = <<<HTML
<form method="post" class="form">
<ul class="list">
<li class="post-types">
<select name="post_type" class="post-type-selector">
<!-- send action to ajax -->
$post_type_options
</select>
</li>
<li class="categories">
<select name="selected_category" class="category-selector">
<!-- respond to ajax result -->
$category_options
</select>
</li>
<li class="posts">
<select name="selected_post" class="post-selector">
<!-- respond to ajax result -->
$post_options
</select>
</li>
</ul>
<input type="hidden" name="taxonomy">
<input type="hidden" name="tax_query_var">
</form>
HTML;
echo $form;
}
private function return_options( $name = \'\' ) {
return \'<option value="default">-- Please select \' . $name . \' --</option>\';
}
}
// create new object
new q363151_category_list();
ajax处理程序(function ($) {
// post type selector
$(\'.form\').on(\'change\', \'.post-type-selector\', function (e) {
var $initiator = $(this); // Error Handling
$initiator.prop(\'disabled\', true); // set ajax data, Object for the AJAX action
var data = {
\'action\': \'update_cat_list\',
\'post_type\': $(\'select[name="post_type"]\').val(),
}; // send ajax
$.ajax({
type: \'post\',
url: q363147.ajaxurl,
dataType: \'json\',
data: data
}).done( function( response ) {
console.log(response);
$initiator.prop(\'disabled\', false);
// update category list
$( \'.category-selector\' ).html( response.data.categories );
// update taxonomy
$( \'[name="taxonomy"]\').val(response.data.taxonomy);
$( \'[name="tax_query_var"]\').val(response.data.tax_query_var);
}).fail( function( jqXHR ) {
// failure handling
});
});
// category selector
$(\'.form\').on(\'change\', \'.category-selector\', function (e) {
var $initiator = $(this); // Error Handling
$initiator.prop(\'disabled\', true); // set ajax data, Object for the AJAX action
var data = {
\'action\': \'update_post_list\',
\'post_type\': $(\'select[name="post_type"]\').val(),
\'selected_category\': $(\'select[name="selected_category"]\').val(),
\'tax_query_var\': $(\'[name="tax_query_var"]\').val(),
}; // send ajax
$.ajax({
type: \'post\',
url: q363147.ajaxurl,
dataType: \'json\',
data: data
}).done( function( response ) {
console.log(response);
$initiator.prop(\'disabled\', false);
// update post list
$( \'.post-selector\' ).html( response.data.posts );
}).fail( function( jqXHR ) {
// failure handling
});
});
})(jQuery);
向观众展示// place anywhere in your template
do_action( \'somewhere_in_your_theme\' );
下面是本示例的屏幕截图。[
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