创建自定义类别小部件
下面的代码是尝试获取WP_Widget_Categories类，并将其用作基于默认类别窗口小部件的自定义类别窗口小部件的基础。
我没有输出，但小部件没有显示在“可用小部件”列表中。我做错了什么？
<?php
/*
Plugin Name: My Categories Widget
Version: 1.0
*/
class MY_Widget_Categories extends WP_Widget {
function MY_Widget_Categories() {
$widget_ops = array( 'classname' => 'widget_categories', 'description' => __( "A list or dropdown of categories" ) );
$this->WP_Widget('categories', __('Categories'), $widget_ops);
}
function widget( $args, $instance ) {
extract( $args );
$title = apply_filters('widget_title', empty( $instance['title'] ) ? __( 'Categories' ) : $instance['title']);
$c = $instance['count'] ? '1' : '0';
$h = $instance['hierarchical'] ? '1' : '0';
$d = $instance['dropdown'] ? '1' : '0';
echo $before_widget;
if ( $title )
echo $before_title . $title . $after_title;
$cat_args = array('orderby' => 'name', 'show_count' => $c, 'hierarchical' => $h);
if ( $d ) {
$cat_args['show_option_none'] = __('Select Category');
wp_dropdown_categories(apply_filters('widget_categories_dropdown_args', $cat_args));
?>
<script type='text/javascript'>
/* <![CDATA[ */
var dropdown = document.getElementById("cat");
function onCatChange() {
if ( dropdown.options[dropdown.selectedIndex].value > 0 ) {
location.href = "<?php echo get_option('home'); ?>/?cat="+dropdown.options[dropdown.selectedIndex].value;
}
}
dropdown.onchange = onCatChange;
/* ]]> */
</script>
<?php
} else {
?>
<ul>
<?php
$cat_args['title_li'] = '';
wp_list_categories(apply_filters('widget_categories_args', $cat_args));
?>
</ul>
<?php
}
echo $after_widget;
}
function update( $new_instance, $old_instance ) {
$instance = $old_instance;
$instance['title'] = strip_tags($new_instance['title']);
$instance['count'] = $new_instance['count'] ? 1 : 0;
$instance['hierarchical'] = $new_instance['hierarchical'] ? 1 : 0;
$instance['dropdown'] = $new_instance['dropdown'] ? 1 : 0;
return $instance;
}
function form( $instance ) {
//Defaults
$instance = wp_parse_args( (array) $instance, array( 'title' => '') );
$title = esc_attr( $instance['title'] );
$count = isset($instance['count']) ? (bool) $instance['count'] :false;
$hierarchical = isset( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false;
$dropdown = isset( $instance['dropdown'] ) ? (bool) $instance['dropdown'] : false;
?>
<p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e( 'Title:' ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" /></p>
<p><input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('dropdown'); ?>" name="<?php echo $this->get_field_name('dropdown'); ?>"<?php checked( $dropdown ); ?> />
<label for="<?php echo $this->get_field_id('dropdown'); ?>"><?php _e( 'Show as dropdown' ); ?></label><br />
<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('count'); ?>" name="<?php echo $this->get_field_name('count'); ?>"<?php checked( $count ); ?> />
<label for="<?php echo $this->get_field_id('count'); ?>"><?php _e( 'Show post counts' ); ?></label><br />
<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('hierarchical'); ?>" name="<?php echo $this->get_field_name('hierarchical'); ?>"<?php checked( $hierarchical ); ?> />
<label for="<?php echo $this->get_field_id('hierarchical'); ?>"><?php _e( 'Show hierarchy' ); ?></label></p>
<?php
}
}
function my_categories_init()
{
register_sidebar_widget(__('My Categories Widget'), 'MY_Widget_Categories');
}
add_action("plugins_loaded", "my_categories_init");
?>
3 个答案:
答案 0 :(得分：3)
您需要使用register_widget而不是register_sidebar_widget，因为该函数适用于旧样式小部件（未扩展WP_Widget或仅仅是函数）。您应该从挂钩到widgets_init操作的函数中执行此操作。有关详细信息，请参阅Wordpress小部件API文档：http://codex.wordpress.org/Widgets_API
以下插件适用于WP 2.9。
/*
Plugin Name: My Categories Widget
Version: 0.1
*/
class My_Widget_Categories extends WP_Widget {
function My_Widget_Categories() {
$widget_ops = array( 'classname' => 'widget_categories', 'description' => __( "My list or dropdown of categories" ) );
$this->WP_Widget('my_categories', __('My Categories'), $widget_ops);
}
function widget( $args, $instance ) {
extract( $args );
$title = apply_filters('widget_title', empty( $instance['title'] ) ? __( 'Categories' ) : $instance['title']);
$c = $instance['count'] ? '1' : '0';
$h = $instance['hierarchical'] ? '1' : '0';
$d = $instance['dropdown'] ? '1' : '0';
echo $before_widget;
if ( $title )
echo $before_title . $title . $after_title;
$cat_args = array('orderby' => 'name', 'show_count' => $c, 'hierarchical' => $h);
if ( $d ) {
$cat_args['show_option_none'] = __('Select Category');
wp_dropdown_categories(apply_filters('widget_categories_dropdown_args', $cat_args));
?>
<script type='text/javascript'>
/* <![CDATA[ */
var dropdown = document.getElementById("cat");
function onCatChange() {
if ( dropdown.options[dropdown.selectedIndex].value > 0 ) {
location.href = "<?php echo get_option('home'); ?>/?cat="+dropdown.options[dropdown.selectedIndex].value;
}
}
dropdown.onchange = onCatChange;
/* ]]> */
</script>
<?php
} else {
?>
<ul>
<?php
$cat_args['title_li'] = '';
wp_list_categories(apply_filters('widget_categories_args', $cat_args));
?>
</ul>
<?php
}
echo $after_widget;
}
function update( $new_instance, $old_instance ) {
$instance = $old_instance;
$instance['title'] = strip_tags($new_instance['title']);
$instance['count'] = $new_instance['count'] ? 1 : 0;
$instance['hierarchical'] = $new_instance['hierarchical'] ? 1 : 0;
$instance['dropdown'] = $new_instance['dropdown'] ? 1 : 0;
return $instance;
}
function form( $instance ) {
//Defaults
$instance = wp_parse_args( (array) $instance, array( 'title' => '') );
$title = esc_attr( $instance['title'] );
$count = isset($instance['count']) ? (bool) $instance['count'] :false;
$hierarchical = isset( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false;
$dropdown = isset( $instance['dropdown'] ) ? (bool) $instance['dropdown'] : false;
?>
<p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e( 'Title:' ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" /></p>
<p><input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('dropdown'); ?>" name="<?php echo $this->get_field_name('dropdown'); ?>"<?php checked( $dropdown ); ?> />
<label for="<?php echo $this->get_field_id('dropdown'); ?>"><?php _e( 'Show as dropdown' ); ?></label><br />
<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('count'); ?>" name="<?php echo $this->get_field_name('count'); ?>"<?php checked( $count ); ?> />
<label for="<?php echo $this->get_field_id('count'); ?>"><?php _e( 'Show post counts' ); ?></label><br />
<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('hierarchical'); ?>" name="<?php echo $this->get_field_name('hierarchical'); ?>"<?php checked( $hierarchical ); ?> />
<label for="<?php echo $this->get_field_id('hierarchical'); ?>"><?php _e( 'Show hierarchy' ); ?></label></p>
<?php
}
}
add_action('widgets_init', create_function('', "register_widget('My_Widget_Categories');"));
答案 1 :(得分：0)
带有分类法/类别选择下拉菜单的“类别”小部件。
<?php
/**
* Custom Post Type Categories widget class
*
* @since 1.0.0
* @package Custom Post Type Widgets
*/
class Custom_Post_Type_Widgets {
/**
* Sets up a new widget instance
*/
public function __construct() {
add_action( 'widgets_init', array( $this, 'init' ) );
}
/**
* Register widget
*/
public function init() {
if ( ! is_blog_installed() ) {
return;
}
register_widget( 'WP_Custom_Post_Type_Widgets_Categories' );
}
}
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
$custom_post_type_widgets = new Custom_Post_Type_Widgets();
/**
* Core class WP_Custom_Post_Type_Widgets_Categories
*
* @since 1.0.0
*/
class WP_Custom_Post_Type_Widgets_Categories extends WP_Widget {
/**
* Sets up a new widget instance.
*
* @since 1.0.0
*
* @access public
*/
public function __construct() {
$widget_ops = array(
'classname' => 'widget_categories',
'description' => __( 'A list or dropdown of categories.', 'custom-post-type-widgets' ),
'customize_selective_refresh' => true,
);
parent::__construct( 'custom-post-type-categories', __( 'Categories (Custom Post Type)', 'custom-post-type-widgets' ), $widget_ops );
}
/**
* Outputs the content for the widget instance.
*
* @since 1.0.0
*
* @access public
*
* @param array $args Display arguments including 'before_title', 'after_title',
* 'before_widget', and 'after_widget'.
* @param array $instance Settings for the current widget instance.
*/
public function widget( $args, $instance ) {
$title = ! empty( $instance['title'] ) ? $instance['title'] : __( 'Categories', 'custom-post-type-widgets' );
/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
$taxonomy = ! empty( $instance['taxonomy'] ) ? $instance['taxonomy'] : 'category';
$c = ! empty( $instance['count'] ) ? (bool) $instance['count'] : false;
$h = ! empty( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false;
$d = ! empty( $instance['dropdown'] ) ? (bool) $instance['dropdown'] : false;
echo $args['before_widget']; // WPCS: XSS ok.
if ( $title ) {
echo $args['before_title'] . $title . $args['after_title']; // WPCS: XSS ok.
}
$cat_args = array(
'orderby' => 'name',
'taxonomy' => $taxonomy,
'show_count' => $c,
'hierarchical' => $h,
);
if ( $d ) {
$dropdown_id = "{$this->id_base}-dropdown-{$this->number}";
echo '<label class="screen-reader-text" for="' . esc_attr( $dropdown_id ) . '">' . $title . '</label>'; // WPCS: XSS ok.
$cat_args['show_option_none'] = __( 'Select Category', 'custom-post-type-widgets' );
$cat_args['name'] = 'category' === $taxonomy ? 'category_name' : $taxonomy;
$cat_args['id'] = $dropdown_id;
$cat_args['value_field'] = 'slug';
?>
<form action="<?php echo esc_url( home_url() ); ?>" method="get">
<?php
/**
* Filters the arguments for the Categories widget drop-down.
*
* Filter hook: custom_post_type_widgets/categories/widget_categories_dropdown_args
*
* @since 2.8.0
* @since 4.9.0 Added the `$instance` parameter.
*
* @see wp_dropdown_categories()
*
* @param array $cat_args An array of Categories widget drop-down arguments.
* @param array $instance Array of settings for the current widget.
* @param string $this->id Widget id.
* @param string $taxonomy Taxonomy.
*/
wp_dropdown_categories(
apply_filters(
'custom_post_type_widgets/categories/widget_categories_dropdown_args',
$cat_args,
$instance,
$this->id,
$taxonomy
)
);
?>
</form>
<script>
/* <![CDATA[ */
(function() {
var dropdown = document.getElementById( "<?php echo esc_js( $dropdown_id ); ?>" );
function onCatChange() {
if ( dropdown.options[dropdown.selectedIndex].value ) {
return dropdown.form.submit();
}
}
dropdown.onchange = onCatChange;
})();
/* ]]> */
</script>
<?php
}
else {
?>
<ul>
<?php
$cat_args['title_li'] = '';
/**
* Filters the arguments for the Categories widget.
*
* Filter hook: custom_post_type_widgets/categories/widget_categories_args
*
* @see wp_list_categories()
*
* @param array $cat_args An array of Categories widget arguments.
* @param array $instance Array of settings for the current widget.
* @param string $this->id Widget id.
* @param string $taxonomy Taxonomy.
*/
wp_list_categories(
apply_filters(
'custom_post_type_widgets/categories/widget_categories_args',
$cat_args,
$instance,
$this->id,
$taxonomy
)
);
?>
</ul>
<?php
}
echo $args['after_widget']; // WPCS: XSS ok.
}
/**
* Handles updating settings for the current Archives widget instance.
*
* @since 1.0.0
*
* @access public
*
* @param array $new_instance New settings for this instance as input by the user via form() method.
* @param array $old_instance Old settings for this instance.
*
* @return array Updated settings to save.
*/
public function update( $new_instance, $old_instance ) {
$instance = $old_instance;
$instance['title'] = sanitize_text_field( $new_instance['title'] );
$instance['taxonomy'] = stripslashes( $new_instance['taxonomy'] );
$instance['count'] = ! empty( $new_instance['count'] ) ? (bool) $new_instance['count'] : false;
$instance['hierarchical'] = ! empty( $new_instance['hierarchical'] ) ? (bool) $new_instance['hierarchical'] : false;
$instance['dropdown'] = ! empty( $new_instance['dropdown'] ) ? (bool) $new_instance['dropdown'] : false;
return $instance;
}
/**
* Outputs the settings form for the widget.
*
* @since 1.0.0
*
* @access public
*
* @param array $instance Current settings.
*/
public function form( $instance ) {
$title = isset( $instance['title'] ) ? $instance['title'] : '';
$taxonomy = isset( $instance['taxonomy'] ) ? $instance['taxonomy'] : '';
$count = isset( $instance['count'] ) ? (bool) $instance['count'] : false;
$hierarchical = isset( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false;
$dropdown = isset( $instance['dropdown'] ) ? (bool) $instance['dropdown'] : false;
?>
<p><label for="<?php echo $this->get_field_id( 'title' ); // WPCS: XSS ok. ?>"><?php esc_html_e( 'Title:', 'custom-post-type-widgets' ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); // WPCS: XSS ok. ?>" name="<?php echo $this->get_field_name( 'title' ); // WPCS: XSS ok. ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></p>
<?php
$taxonomies = get_taxonomies( array(), 'objects' );
if ( $taxonomies ) {
printf(
'<p><label for="%1$s">%2$s</label>' .
'<select class="widefat" id="%1$s" name="%3$s">',
$this->get_field_id( 'taxonomy' ),
__( 'Taxonomy:', 'custom-post-type-widgets' ),
$this->get_field_name( 'taxonomy' )
); // WPCS: XSS ok.
foreach ( $taxonomies as $taxobjects => $value ) {
if ( ! $value->hierarchical ) {
continue;
}
if ( 'nav_menu' === $taxobjects || 'link_category' === $taxobjects || 'post_format' === $taxobjects ) {
continue;
}
printf(
'<option value="%s"%s>%s</option>',
esc_attr( $taxobjects ),
selected( $taxobjects, $taxonomy, false ),
esc_html__( $value->label, 'custom-post-type-widgets' ) . ' ' . esc_html( $taxobjects )
);
}
echo '</select></p>';
}
?>
<p><input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'dropdown' ); // WPCS: XSS ok. ?>" name="<?php echo $this->get_field_name( 'dropdown' ); // WPCS: XSS ok. ?>"<?php checked( $dropdown ); ?> />
<label for="<?php echo $this->get_field_id( 'dropdown' ); // WPCS: XSS ok. ?>"><?php esc_html_e( 'Display as dropdown', 'custom-post-type-widgets' ); ?></label><br />
<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'count' ); // WPCS: XSS ok. ?>" name="<?php echo $this->get_field_name( 'count' ); // WPCS: XSS ok. ?>"<?php checked( $count ); ?> />
<label for="<?php echo $this->get_field_id( 'count' ); // WPCS: XSS ok. ?>"><?php esc_html_e( 'Show post counts', 'custom-post-type-widgets' ); ?></label><br />
<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'hierarchical' ); // WPCS: XSS ok. ?>" name="<?php echo $this->get_field_name( 'hierarchical' ); // WPCS: XSS ok. ?>"<?php checked( $hierarchical ); ?> />
<label for="<?php echo $this->get_field_id( 'hierarchical' ); // WPCS: XSS ok. ?>"><?php esc_html_e( 'Show hierarchy', 'custom-post-type-widgets' ); ?></label></p>
<?php
}
}
答案 2 :(得分：-1)
我认为你可以使用内置的wp函数。
<?php
$args = array(
'name' => $this->get_field_name('category'),
'show_option_none' => __( 'Select category' ),
'show_count' => 1,
'orderby' => 'name',
'echo' => 0,
'selected' => $category,
'class' => 'widefat'
);
echo wp_dropdown_categories($args);
?>
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