/**
* Display or retrieve the HTML dropdown list of categories.
*
- * The list of arguments is below:
- * 'show_option_all' (string) - Text to display for showing all categories.
- * 'show_option_none' (string) - Text to display for showing no categories.
- * 'option_none_value' (mixed) - Value to use when no category is selected.
- * 'orderby' (string) default is 'ID' - What column to use for ordering the
- * categories.
- * 'order' (string) default is 'ASC' - What direction to order categories.
- * 'show_count' (bool|int) default is 0 - Whether to show how many posts are
- * in the category.
- * 'hide_empty' (bool|int) default is 1 - Whether to hide categories that
- * don't have any posts attached to them.
- * 'child_of' (int) default is 0 - See {@link get_categories()}.
- * 'exclude' (string) - See {@link get_categories()}.
- * 'echo' (bool|int) default is 1 - Whether to display or retrieve content.
- * 'depth' (int) - The max depth.
- * 'tab_index' (int) - Tab index for select element.
- * 'name' (string) - The name attribute value for select element.
- * 'id' (string) - The ID attribute value for select element. Defaults to name if omitted.
- * 'class' (string) - The class attribute value for select element.
- * 'selected' (int) - Which category ID is selected.
- * 'taxonomy' (string) - The name of the taxonomy to retrieve. Defaults to category.
- *
* The 'hierarchical' argument, which is disabled by default, will override the
* depth argument, unless it is true. When the argument is false, it will
* display all of the categories. When it is enabled it will use the value in
* the 'depth' argument.
*
* @since 2.1.0
- *
- * @param string|array $args Optional. Override default arguments.
+ * @since 4.2.0 Introduced the `value_field` argument.
+ *
+ * @param string|array $args {
+ * Optional. Array or string of arguments to generate a categories drop-down element.
+ *
+ * @type string $show_option_all Text to display for showing all categories. Default empty.
+ * @type string $show_option_none Text to display for showing no categories. Default empty.
+ * @type string $option_none_value Value to use when no category is selected. Default empty.
+ * @type string $orderby Which column to use for ordering categories. See get_terms() for a list
+ * of accepted values. Default 'id' (term_id).
+ * @type string $order Whether to order terms in ascending or descending order. Accepts 'ASC'
+ * or 'DESC'. Default 'ASC'.
+ * @type bool $pad_counts See get_terms() for an argument description. Default false.
+ * @type bool|int $show_count Whether to include post counts. Accepts 0, 1, or their bool equivalents.
+ * Default 0.
+ * @type bool|int $hide_empty Whether to hide categories that don't have any posts. Accepts 0, 1, or
+ * their bool equivalents. Default 1.
+ * @type int $child_of Term ID to retrieve child terms of. See get_terms(). Default 0.
+ * @type array|string $exclude Array or comma/space-separated string of term ids to exclude.
+ * If `$include` is non-empty, `$exclude` is ignored. Default empty array.
+ * @type bool|int $echo Whether to echo or return the generated markup. Accepts 0, 1, or their
+ * bool equivalents. Default 1.
+ * @type bool|int $hierarchical Whether to traverse the taxonomy hierarchy. Accepts 0, 1, or their bool
+ * equivalents. Default 0.
+ * @type int $depth Maximum depth. Default 0.
+ * @type int $tab_index Tab index for the select element. Default 0 (no tabindex).
+ * @type string $name Value for the 'name' attribute of the select element. Default 'cat'.
+ * @type string $id Value for the 'id' attribute of the select element. Defaults to the value
+ * of `$name`.
+ * @type string $class Value for the 'class' attribute of the select element. Default 'postform'.
+ * @type int|string $selected Value of the option that should be selected. Default 0.
+ * @type string $value_field Term field that should be used to populate the 'value' attribute
+ * of the option elements. Accepts any valid term field: 'term_id', 'name',
+ * 'slug', 'term_group', 'term_taxonomy_id', 'taxonomy', 'description',
+ * 'parent', 'count'. Default 'term_id'.
+ * @type string $taxonomy Name of the category to retrieve. Default 'category'.
+ * @type bool $hide_if_empty True to skip generating markup if no categories are found.
+ * Default false (create select element even if no categories are found).
+ * }
* @return string HTML content only if 'echo' argument is 0.
*/
function wp_dropdown_categories( $args = '' ) {
'name' => 'cat', 'id' => '',
'class' => 'postform', 'depth' => 0,
'tab_index' => 0, 'taxonomy' => 'category',
- 'hide_if_empty' => false, 'option_none_value' => -1
+ 'hide_if_empty' => false, 'option_none_value' => -1,
+ 'value_field' => 'term_id',
);
$defaults['selected'] = ( is_category() ) ? get_query_var( 'cat' ) : 0;
if ( (int) $tab_index > 0 ) {
$tab_index_attribute = " tabindex=\"$tab_index\"";
}
- $categories = get_terms( $r['taxonomy'], $r );
+
+ // Avoid clashes with the 'name' param of get_terms().
+ $get_terms_args = $r;
+ unset( $get_terms_args['name'] );
+ $categories = get_terms( $r['taxonomy'], $get_terms_args );
+
$name = esc_attr( $r['name'] );
$class = esc_attr( $r['class'] );
$id = $r['id'] ? esc_attr( $r['id'] ) : $name;
function walk_category_tree() {
$args = func_get_args();
// the user's options are the third parameter
- if ( empty($args[2]['walker']) || !is_a($args[2]['walker'], 'Walker') )
+ if ( empty( $args[2]['walker'] ) || ! ( $args[2]['walker'] instanceof Walker ) ) {
$walker = new Walker_Category;
- else
+ } else {
$walker = $args[2]['walker'];
-
+ }
return call_user_func_array(array( &$walker, 'walk' ), $args );
}
$category
);
+ // Don't generate an element if the category name is empty.
+ if ( ! $cat_name ) {
+ return;
+ }
+
$link = '<a href="' . esc_url( get_term_link( $category ) ) . '" ';
if ( $args['use_desc_for_title'] && ! empty( $category->description ) ) {
/**
}
if ( 'list' == $args['style'] ) {
$output .= "\t<li";
- $class = 'cat-item cat-item-' . $category->term_id;
+ $css_classes = array(
+ 'cat-item',
+ 'cat-item-' . $category->term_id,
+ );
+
if ( ! empty( $args['current_category'] ) ) {
$_current_category = get_term( $args['current_category'], $category->taxonomy );
if ( $category->term_id == $args['current_category'] ) {
- $class .= ' current-cat';
+ $css_classes[] = 'current-cat';
} elseif ( $category->term_id == $_current_category->parent ) {
- $class .= ' current-cat-parent';
+ $css_classes[] = 'current-cat-parent';
}
}
- $output .= ' class="' . $class . '"';
+
+ /**
+ * Filter the list of CSS classes to include with each category in the list.
+ *
+ * @since 4.2.0
+ *
+ * @see wp_list_categories()
+ *
+ * @param array $css_classes An array of CSS classes to be applied to each list item.
+ * @param object $category Category data object.
+ * @param int $depth Depth of page, used for padding.
+ * @param array $args An array of wp_list_categories() arguments.
+ */
+ $css_classes = implode( ' ', apply_filters( 'category_css_class', $css_classes, $category, $depth, $args ) );
+
+ $output .= ' class="' . $css_classes . '"';
$output .= ">$link\n";
} else {
$output .= "\t$link<br />\n";
* @param string $output Passed by reference. Used to append additional content.
* @param object $category Category data object.
* @param int $depth Depth of category. Used for padding.
- * @param array $args Uses 'selected' and 'show_count' keys, if they exist. @see wp_dropdown_categories()
+ * @param array $args Uses 'selected', 'show_count', and 'value_field' keys, if they exist.
+ * See {@see wp_dropdown_categories()}.
*/
public function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) {
$pad = str_repeat(' ', $depth * 3);
/** This filter is documented in wp-includes/category-template.php */
$cat_name = apply_filters( 'list_cats', $category->name, $category );
- $output .= "\t<option class=\"level-$depth\" value=\"".$category->term_id."\"";
+ if ( ! isset( $args['value_field'] ) || ! isset( $category->{$args['value_field']} ) ) {
+ $args['value_field'] = 'term_id';
+ }
+
+ $output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $category->{$args['value_field']} ) . "\"";
+
if ( $category->term_id == $args['selected'] )
$output .= ' selected="selected"';
$output .= '>';
if ( empty( $terms ) )
return false;
+ $links = array();
+
foreach ( $terms as $term ) {
$link = get_term_link( $term, $taxonomy );
- if ( is_wp_error( $link ) )
+ if ( is_wp_error( $link ) ) {
return $link;
- $term_links[] = '<a href="' . esc_url( $link ) . '" rel="tag">' . $term->name . '</a>';
+ }
+ $links[] = '<a href="' . esc_url( $link ) . '" rel="tag">' . $term->name . '</a>';
}
/**
*
* @since 2.5.0
*
- * @param array $term_links An array of term links.
+ * @param array $links An array of term links.
*/
- $term_links = apply_filters( "term_links-$taxonomy", $term_links );
+ $term_links = apply_filters( "term_links-$taxonomy", $links );
return $before . join( $sep, $term_links ) . $after;
}
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