用于 Wordpress 的自定义小部件，可将类别标记为“新！”

Question

尝试为我的简单 wordpress 博客构建一个小部件，它将在侧边栏中显示类别，但与本机 wordpress 类别小部件不完全相同。基本上，我想要实现的是能够将某些类别标记为 "New!" 或类似的东西，但来自小部件本身。

到目前为止，我有以下代码可以注册我的小部件，并且可以在名称旁边的复选框中在后端显示其中的类别列表。

当我选中此框并尝试保存它时，returns 再次取消选中。不确定我的更新函数是否真的在工作，因为数据库中的序列化数组在保存时没有改变。

这是我目前所做的：

/* CUSTOM BLOG CATEGORIES WIDGETS */
class Spr123_Categories_Widget extends WP_Widget {
    public function __construct() {
        $widget_options = array(
            'classname' => 'widget_custom_categories_widget',
            'description' => 'This is a Custom Blog Categories Widget',
        );
        parent::__construct( 'custom_categories_widget', 'Custom Categories Widget', $widget_options );
    }

    public function form( $instance ) {
        $title = ! empty( $instance['title'] ) ? $instance['title'] : '';
        $name = ! empty( $instance['name'] ) ? $instance['name'] : '';
        $checked = isset( $instance['checked'] ) ? (bool) $instance['checked'] : false;
        $categories = get_categories( array(
            'orderby' => 'name',
            'parent'  => 0,
            "hide_empty" => 0,
        ) );
        ?>
        <p>
            <label for="<?php echo $this->get_field_id( 'title' ); ?>">Title:</label>
            <input type="text" id="<?php echo $this->get_field_id( 'title' ); ?>" class="widefat" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo esc_attr( $title ); ?>" />
        </p>
        <p>
            <label for="Categories">Categories:</label>
        </p>
        <?php print("<pre>".print_r($categories,true)."</pre>"); ?>
        <p>
        <?php
        foreach ( $categories as $category ) {
            ?>
            <input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id($category->slug); ?>" name="<?php echo $this->get_field_name('checked'); ?>"<?php checked( $checked ); ?> />
            <label for="<?php echo $this->get_field_id($category->slug); ?>"><?php _e( 'Display as NEW - ' . esc_attr( $category->name )); ?></label><br />
            <?php
        }
        ?>
        </p>
        <?php

    }

    public function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $instance[ 'title' ] = strip_tags( $new_instance[ 'title' ] );
        $instance[ 'name' ] = strip_tags( $new_instance[ 'name' ] );
        $instance[ 'checked' ] = !empty($new_instance['checked']) ? 1 : 0;
        return $instance;
    }

    public function widget( $args, $instance ) {

        $title = apply_filters( 'widget_title', $instance[ 'title' ] );
        $category_title = apply_filters( 'widget_title', $instance[ 'name' ] );

        echo $args['before_widget'] . $args['before_title'] . $title . $args['after_title']; ?>

        <p><?php echo $category_title ?></p>

        <?php echo $args['after_widget'];
    }

}
function spr123_custom_categories_widget() {
    register_widget( 'Spr123_Categories_Widget' );
}
add_action( 'widgets_init', 'spr123_custom_categories_widget' );

Answer 1

试试这个代码

  /* CUSTOM BLOG CATEGORIES WIDGETS */
class Spr123_Categories_Widget extends WP_Widget {
    public function __construct() {
        $widget_options = array(
            'classname' => 'widget_custom_categories_widget',
            'description' => 'This is a Custom Blog Categories Widget',
        );
        parent::__construct( 'custom_categories_widget', 'Custom Categories Widget', $widget_options );
    }

    public function form( $instance ) {
        $title = ! empty( $instance['title'] ) ? $instance['title'] : '';
        $name = ! empty( $instance['name'] ) ? $instance['name'] : '';
        $checked = isset( $instance['checked'] ) ? (bool) $instance['checked'] : false;

        $savedcategories = ! empty( $instance['categories'] ) ? $instance['categories'] : '';

        $categories = get_categories( array(
            'orderby' => 'name',
            'parent'  => 0,
            "hide_empty" => 0,
        ) );
        ?>
        <p>
            <label for="<?php echo $this->get_field_id( 'title' ); ?>">Title:</label>
            <input type="text" id="<?php echo $this->get_field_id( 'title' ); ?>" class="widefat" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo esc_attr( $title ); ?>" />
        </p>
        <p>
            <label for="Categories">Categories:</label>
        </p>
<!--        --><?php //print("<pre>".print_r($categories,true)."</pre>"); ?>
        <p>
        <?php
        foreach ( $categories as $category ) {
              $checked  = in_array($category->term_id, $savedcategories)?'checked':'';
            ?>
            <input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id($category->slug); ?>" name="<?php echo $this->get_field_name('categories[]'); ?>" <?php echo $checked; ?> value="<?php echo $category->term_id; ?>"/>
            <label for="<?php echo $this->get_field_id($category->slug); ?>"><?php echo esc_attr( $category->name ) . _e( 'Display as NEW - ' ); ?></label><br />
            <?php
        }
        ?>
        </p>
        <?php

    }

    public function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $instance[ 'title' ] = strip_tags( $new_instance[ 'title' ] );
        $instance[ 'name' ] = strip_tags( $new_instance[ 'name' ] );        
        $instance[ 'categories' ] = $new_instance['categories'];       
        return $instance;
    }

    public function widget( $args, $instance ) {

        $title = apply_filters( 'widget_title', $instance[ 'title' ] );
        $category_title = apply_filters( 'widget_title', $instance[ 'name' ] );

        echo $args['before_widget'] . $args['before_title'] . $title . $args['after_title']; ?>

        <p><?php echo $category_title ?></p>

        <?php echo $args['after_widget'];
    }

}
function spr123_custom_categories_widget() {
    register_widget( 'Spr123_Categories_Widget' );
}
add_action( 'widgets_init', 'spr123_custom_categories_widget' );

您可以使用此代码在前端获取值

   $widget_instances = get_option('widget_custom_categories_widget');

    print_r($widget_instances);

用于 Wordpress 的自定义小部件，可将类别标记为“新！”

Custom Widget for Wordpress to Enable marking Categories as “New!”

php

wordpress

widget

categories