wp_dropdown_pages() │ WP 2.1.0

Retrieve or display list of pages as a dropdown (select list).

Uses: get_pages()
Hooks from the function

Return

String. HTML dropdown list of pages.

Usage

wp_dropdown_pages( $args );
$args(array|string)

Array or string of arguments to generate a page dropdown. See get_pages() additional arguments.

Default: ''

  • depth(int)
    Maximum depth.

  • child_of(int)
    Page ID to retrieve child pages of.

  • selected(int|string)
    Value of the option that should be selected.

  • echo(true|false|int)
    Whether to echo or return the generated markup. Accepts 0, 1, or their bool equivalents.
    Default: 1

  • name(string)
    Value for the 'name' attribute of the select element.
    Default: 'page_id'

  • id(string)
    Value for the 'id' attribute of the select element.

  • class(string)
    Value for the 'class' attribute of the select element. Defaults to the value of $name.
    Default: none

  • show_option_none(string)
    Text to display for showing no pages.
    Default: empty (does not display)

  • show_option_no_change(string)
    Text to display for "no change" option.
    Default: empty (does not display)

  • option_none_value(string)
    Value to use when no page is selected.
    Default: ''

  • value_field(string)
    Post field used to populate the 'value' attribute of the option elements. Accepts any valid post field.
    Default: 'ID'

Notes

Changelog

Since 2.1.0 Introduced.
Since 4.2.0 The $value_field argument was added.
Since 4.3.0 The $class argument was added.

Code of wp_dropdown_pages() WP 6.0

wp-includes/post-template.php 
function wp_dropdown_pages( $args = '' ) {
	$defaults = array(
		'depth'                 => 0,
		'child_of'              => 0,
		'selected'              => 0,
		'echo'                  => 1,
		'name'                  => 'page_id',
		'id'                    => '',
		'class'                 => '',
		'show_option_none'      => '',
		'show_option_no_change' => '',
		'option_none_value'     => '',
		'value_field'           => 'ID',
	);

	$parsed_args = wp_parse_args( $args, $defaults );

	$pages  = get_pages( $parsed_args );
	$output = '';
	// Back-compat with old system where both id and name were based on $name argument.
	if ( empty( $parsed_args['id'] ) ) {
		$parsed_args['id'] = $parsed_args['name'];
	}

	if ( ! empty( $pages ) ) {
		$class = '';
		if ( ! empty( $parsed_args['class'] ) ) {
			$class = " class='" . esc_attr( $parsed_args['class'] ) . "'";
		}

		$output = "<select name='" . esc_attr( $parsed_args['name'] ) . "'" . $class . " id='" . esc_attr( $parsed_args['id'] ) . "'>\n";
		if ( $parsed_args['show_option_no_change'] ) {
			$output .= "\t<option value=\"-1\">" . $parsed_args['show_option_no_change'] . "</option>\n";
		}
		if ( $parsed_args['show_option_none'] ) {
			$output .= "\t<option value=\"" . esc_attr( $parsed_args['option_none_value'] ) . '">' . $parsed_args['show_option_none'] . "</option>\n";
		}
		$output .= walk_page_dropdown_tree( $pages, $parsed_args['depth'], $parsed_args );
		$output .= "</select>\n";
	}

	/**
	 * Filters the HTML output of a list of pages as a drop down.
	 *
	 * @since 2.1.0
	 * @since 4.4.0 `$parsed_args` and `$pages` added as arguments.
	 *
	 * @param string    $output      HTML output for drop down list of pages.
	 * @param array     $parsed_args The parsed arguments array. See wp_dropdown_pages()
	 *                               for information on accepted arguments.
	 * @param WP_Post[] $pages       Array of the page objects.
	 */
	$html = apply_filters( 'wp_dropdown_pages', $output, $parsed_args, $pages );

	if ( $parsed_args['echo'] ) {
		echo $html;
	}

	return $html;
}

List (wp_list)

Pages