Question

parent_dropdown( int $default,  int $parent,  int $level,  int|WP_Post $post = null )

Print out option HTML elements for the page parents drop-down.

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description

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参数

$default

(int) (Optional) The default page ID to be pre-selected. Default 0.

$parent

(int) (Optional) The parent page ID. Default 0.

$level

(int) (Optional) Page depth level. Default 0.

$post

(int|WP_Post) (Optional) Post ID or WP_Post object.

Default value: null

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返回值

(null|false) Boolean False if page has no children, otherwise print out html elements

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源代码

File: wp-admin/includes/template.php

function parent_dropdown( $default = 0, $parent = 0, $level = 0, $post = null ) {
	global $wpdb;
	$post = get_post( $post );
	$items = $wpdb->get_results( $wpdb->prepare("SELECT ID, post_parent, post_title FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'page' ORDER BY menu_order", $parent) );

	if ( $items ) {
		foreach ( $items as $item ) {
			// A page cannot be its own parent.
			if ( $post && $post->ID && $item->ID == $post->ID )
				continue;

			$pad = str_repeat( ' ', $level * 3 );
			$selected = selected( $default, $item->ID, false );

			echo "\n\t<option class='level-$level' value='$item->ID' $selected>$pad " . esc_html($item->post_title) . "</option>";
			parent_dropdown( $default, $item->ID, $level +1 );
		}
	} else {
		return false;
	}
}

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更新日志

Version	description
4.4.0	$post argument was added.
1.5.0	Introduced.

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相关函数

Uses

• wp-admin/includes/template.php: parent_dropdown()
• wp-includes/formatting.php: esc_html()
• wp-includes/general-template.php: selected()
• wp-includes/post.php: get_post()
• wp-includes/wp-db.php: wpdb::get_results()
• wp-includes/wp-db.php: wpdb::prepare()
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Used By

• wp-admin/includes/template.php: parent_dropdown()

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User Contributed Notes