php - 如何在 wordpress 的自定义元框中添加帖子类别
问题描述
我想在下拉选择框中加载我的帖子类别我该怎么做请帮助我我是编程新手:
这是我创建自定义元框的代码,现在在此处的类别描述中,我希望它在下拉菜单中加载所有帖子类别:代码的输出显示在所附图像中。
//Start: Adding custom metaboxes
class leaderboarddetailMetabox {
private $screen = array(
'ld-leaderboard',
);
private $meta_fields = array(
array(
'label' => 'Number of Students',
'id' => 'numberofstudent_81418',
'type' => 'number',
),
array(
'label' => 'Select Point Type',
'id' => 'selectpointtype_39141',
'type' => 'select',
'options' => array(
'Select',
'Int',
'Float',
'String',
),
),
array(
'label' => 'Category',
'id' => 'category_59112',
'type' => 'select',
'options' => array(
'Select',
'Course',
'Lesson',
'Topic',
'Quiz',
'Category',
),
),
array(
'label' => 'Time',
'id' => 'time_93126',
'type' => 'date',
),
array(
'label' => 'Shortcode',
'id' => 'shortcode_85946',
'type' => 'text',
'readonly' => true,
),
);
public function __construct() {
add_action( 'add_meta_boxes', array( $this, 'add_meta_boxes' ) );
add_action( 'save_post', array( $this, 'save_fields' ) );
}
// show meta boxes on admin page
public function add_meta_boxes() {
foreach ( $this->screen as $single_screen ) {
add_meta_box(
'leaderboarddetail',
__( 'leader board detail', 'textdomain' ),
array( $this, 'meta_box_callback' ),
$single_screen,
'advanced',
'default'
);
}
}
public function meta_box_callback( $post ) {
wp_nonce_field( 'leaderboarddetail_data', 'leaderboarddetail_nonce' );
$this->field_generator( $post );
}
public function field_generator( $post ) {
$output = '';
foreach ( $this->meta_fields as $meta_field ) {
$label = '<label for="' . $meta_field['id'] . '">' . $meta_field['label'] . '</label>';
$meta_value = get_post_meta( $post->ID, $meta_field['id'], true );
if ( empty( $meta_value ) ) {
$meta_value = $meta_field['default']; }
switch ( $meta_field['type'] ) {
case 'select':
$input = sprintf(
'<select id="%s" name="%s">',
$meta_field['id'],
$meta_field['id']
);
foreach ( $meta_field['options'] as $key => $value ) {
$meta_field_value = !is_numeric( $key ) ? $key : $value;
$input .= sprintf(
'<option %s value="%s">%s</option>',
$meta_value === $meta_field_value ? 'selected' : '',
$meta_field_value,
$value
);
}
$input .= '</select>';
break;
default:
$input = sprintf(
'<input %s id="%s" name="%s" type="%s" value="%s" %s >',
$meta_field['type'] !== 'color' ? 'style="width: 100%"' : '',
$meta_field['id'],
$meta_field['id'],
$meta_field['type'],
$meta_value,
$meta_field['readonly'] ? "readonly" : ""
);
}
$output .= $this->format_rows( $label, $input );
}
echo '<table class="form-table"><tbody>' . $output . '</tbody></table>';
}
public function format_rows( $label, $input ) {
return '<tr><th>'.$label.'</th><td>'.$input.'</td></tr>';
}
// save custom field data to databse and in the field
public function save_fields( $post_id ) {
if ( ! isset( $_POST['leaderboarddetail_nonce'] ) )
return $post_id;
$nonce = $_POST['leaderboarddetail_nonce'];
if ( !wp_verify_nonce( $nonce, 'leaderboarddetail_data' ) )
return $post_id;
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
return $post_id;
foreach ( $this->meta_fields as $meta_field ) {
if ( isset( $_POST[ $meta_field['id'] ] ) ) {
switch ( $meta_field['type'] ) {
case 'email':
$_POST[ $meta_field['id'] ] = sanitize_email( $_POST[ $meta_field['id'] ] );
break;
case 'text':
$_POST[ $meta_field['id'] ] = sanitize_text_field( $_POST[ $meta_field['id'] ] );
break;
}
update_post_meta( $post_id, $meta_field['id'], $_POST[ $meta_field['id'] ] );
} else if ( $meta_field['type'] === 'checkbox' ) {
update_post_meta( $post_id, $meta_field['id'], '0' );
}
// generate shortcode and save
if( $meta_field['id'] == 'shortcode_85946' ) {
// update meta
update_post_meta( $post_id, $meta_field['id'], "[custom-shortcode id=" . $post_id . "]");
}
}
}
}
if (class_exists('leaderboarddetailMetabox')) {
new leaderboarddetailMetabox;
};
?>
解决方案
要获取类别,您可以使用get_terms()
或get_categories()
如果您使用的是默认帖子类别而不是自定义分类法,您的功能应该类似于:
$categories = get_categories( array(
'orderby' => 'name',
'order' => 'ASC',
'hide_empty' => false
) );
$categoryNames = array();
if (is_array($categories)) {
foreach ($categories as $category) {
array_push($categoryNames, $category->name);
}
}
这将更改您的$meta_fields
变量,如下所示:
private $meta_fields = array(
array(
'label' => 'Number of Students',
'id' => 'numberofstudent_81418',
'type' => 'number',
),
array(
'label' => 'Select Point Type',
'id' => 'selectpointtype_39141',
'type' => 'select',
'options' => array(
'Select',
'Int',
'Float',
'String',
),
),
array(
'label' => 'Category',
'id' => 'category_59112',
'type' => 'select',
'options' => $categoryNames
),
array(
'label' => 'Time',
'id' => 'time_93126',
'type' => 'date',
),
array(
'label' => 'Shortcode',
'id' => 'shortcode_85946',
'type' => 'text',
'readonly' => true,
),
);
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