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87 lines
2.0 KiB
87 lines
2.0 KiB
9 months ago
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<?php
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defined( 'ABSPATH' ) || die;
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/**
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* Select tree walker for cascading select fields.
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*/
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class RWMB_Walker_Select_Tree {
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/**
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* Field settings.
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*
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* @var array
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*/
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public $field;
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/**
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* Field meta value.
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*
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* @var array
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*/
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public $meta;
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/**
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* Constructor.
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*
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* @param array $field Field parameters.
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* @param mixed $meta Meta value.
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*/
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public function __construct( $field, $meta ) {
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$this->field = $field;
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$this->meta = (array) $meta;
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}
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/**
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* Display array of elements hierarchically.
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*
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* @param array $options An array of options.
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*
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* @return string
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*/
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public function walk( $options ) {
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$children = [];
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foreach ( $options as $option ) {
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$parent = $option->parent ?? 0;
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$children[ $parent ][] = $option;
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}
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$top_level = isset( $children[0] ) ? 0 : $options[0]->parent;
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return $this->display_level( $children, $top_level, true );
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}
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/**
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* Display a hierarchy level.
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*
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* @param array $options An array of options.
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* @param int $parent_id Parent item ID.
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* @param bool $active Whether to show or hide.
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*
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* @return string
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*/
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public function display_level( $options, $parent_id = 0, $active = false ) {
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$field = $this->field;
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$walker = new RWMB_Walker_Select( $field, $this->meta );
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$attributes = RWMB_Field::call( 'get_attributes', $field, $this->meta );
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$children = $options[ $parent_id ];
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$output = sprintf(
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'<div class="rwmb-select-tree %s" data-parent-id="%s"><select %s>',
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$active ? '' : 'hidden',
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esc_attr( $parent_id ),
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RWMB_Field::render_attributes( $attributes )
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);
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$output .= $field['placeholder'] ? "<option value=''>{$field['placeholder']}</option>" : '<option></option>';
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$output .= $walker->walk( $children, - 1 );
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$output .= '</select>';
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foreach ( $children as $child ) {
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if ( isset( $options[ $child->value ] ) ) {
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$output .= $this->display_level( $options, $child->value, in_array( $child->value, $this->meta ) && $active );
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}
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}
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$output .= '</div>';
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return $output;
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}
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}
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