WordPress 后台文章列表设置文章特色图片（缩略图）集成版

发布于 2022.09.18

设置文章特色图像对于 WordPress 用户应该都不陌生吧，就是文章的缩略图，目前几乎所有的国内 WordP…

设置文章特色图像对于 WordPress 用户应该都不陌生吧，就是文章的缩略图，目前几乎所有的国内 WordPress 主题，文章缩略图都是按照：特色图像》文章内第一张图片》默认图片，这个顺序进行显示。

但并不是每篇文章内的第一张图片都能作为缩略图进行完美显示，所以很多时候我们都需要单独设置文章特色图像，以达到最好的显示效果。

特别在新搭建 WordPress 网站的时候，往往可能需要频繁的设置文章特色图像，functions.php 添加以下代码：

```
/**
```

 * WordPress 后台文章列表设置文章特色图片（缩略图）集成版

 * Plugin Name: Easy Thumbnail Switcher

```
 */
```
```
class doocii_Easy_Thumbnail_Switcher {
```
```
 
```
```
    public $add_new_str;
```
```
    public $change_str;
```
```
    public $remove_str;
```
```
    public $upload_title;
```
```
    public $upload_add;
```
```
    public $confirm_str;
```
```
 
```
```
    public function __construct() {
```
```
 
```

        $this->add_new_str = __( '添加');

        $this->change_str = __( '更改');

        $this->remove_str = __( '移除');

        $this->upload_title = __( '上传特色图片');

        $this->upload_add = __( '确定');

        $this->confirm_str = __( '你确定?');

```
 
```

        add_filter( 'manage_posts_columns', array( $this, 'add_column' ) );

        add_action( 'manage_posts_custom_column', array( $this, 'thumb_column' ), 10, 2 );

        add_action( 'admin_footer', array( $this, 'add_nonce' ) );

        add_action( 'admin_enqueue_scripts', array( $this, 'scripts' ) );

```
 
```

        add_action( 'wp_ajax_ts_ets_update', array( $this, 'update' ) );

        add_action( 'wp_ajax_ts_ets_remove', array( $this, 'remove' ) );

```
 
```

        add_image_size( 'ts-ets-thumb', 75, 75, array( 'center', 'center' ) );

```
 
```
```
    }
```
```
 
```
```
    /**
```
```
     * 安全检查
```
```
     */
```
```
    public function add_nonce() {
```
```
 
```
```
        global $pagenow;
```
```
 
```
```
        if( $pagenow !== 'edit.php' ) {
```
```
            return;
```
```
        }
```

        wp_nonce_field( 'ts_ets_nonce', 'ts_ets_nonce' );

```
 
```
```
    }
```
```
 
```
```
    /**
```
```
     * 加载脚本
```
```
     */
```

    public function scripts( $pagenow ) {

```
 
```
```
        if( $pagenow !== 'edit.php' ) {
```
```
            return;
```
```
        }
```
```
 
```
```
        wp_enqueue_media();
```

        wp_enqueue_script( 'doocii-ets-js', get_template_directory_uri() . '/js/script.js', array( 'jquery', 'media-upload', 'thickbox' ), '1.0', true );

```
 
```

        wp_localize_script( 'doocii-ets-js', 'ets_strings', array(

            'upload_title' => $this->upload_title,

            'upload_add' => $this->upload_add,

            'confirm' => $this->confirm_str,

```
        ) );
```
```
 
```
```
    }
```
```
 
```
```
    /**
```

     * The action which is added to the post row actions

```
     */
```

    public function add_column( $columns ) {

```
 
```

        $columns['ts-ets-option'] = __( '缩略图');

```
        return $columns;
```
```
 
```
```
    }
```
```
 
```
```
    /**
```
```
     * 显示列
```
```
     */
```

    public function thumb_column( $column, $id ) {

```
 
```
```
        switch( $column ) {
```
```
            case 'ts-ets-option':
```
```
 
```

                if( has_post_thumbnail() ) {

                    the_post_thumbnail( 'ts-ets-thumb' );

```
                    echo '<br>';
```

                    echo sprintf( '<button type="button" class="button-primary ts-ets-add" data-id="%s">%s</button>', esc_attr( $id ), $this->change_str );

                    echo sprintf( ' <button type="button" class="button-secondary ts-ets-remove" data-id="%s">%s</button>', esc_attr( $id ), $this->remove_str );

```
                } else {
```

                    echo sprintf( '<button type="button" class="button-primary ts-ets-add" data-id="%s">%s</button>', esc_attr( $id ), $this->add_new_str );

```
                }
```
```
 
```
```
                break;
```
```
        }
```
```
 
```
```
    }
```
```
 
```
```
    /**
```
```
     * AJAX保存更新缩略图
```
```
     */
```
```
    public function update() {
```
```
 
```

        // 检查是否所有需要的数据都设置与否

        if( !isset( $_POST['nonce'] ) || !isset( $_POST['post_id'] ) || !isset( $_POST['thumb_id'] ) ) {

```
            wp_die();
```
```
        }
```
```
 
```
```
        //验证
```

        if( !wp_verify_nonce( $_POST['nonce'], 'ts_ets_nonce' ) ) {

```
            wp_die();
```
```
        }
```
```
 
```
```
        $id = $_POST['post_id'];
```
```
        $thumb_id = $_POST['thumb_id'];
```
```
 
```

        set_post_thumbnail( $id, $thumb_id );

```
 
```

        echo wp_get_attachment_image( $thumb_id, 'ts-ets-thumb' );

```
        echo '<br>';
```

        echo sprintf( '<button type="button" class="button-primary ts-ets-add" data-id="%s">%s</button>', esc_attr( $id ), $this->change_str );

        echo sprintf( ' <button type="button" class="button-secondary ts-ets-remove" data-id="%s">%s</button>', esc_attr( $id ), $this->remove_str );

```
 
```
```
        wp_die();
```
```
 
```
```
    }
```
```
 
```
```
    /**
```
```
     * AJAX回调后删除缩略图
```
```
     */
```
```
    public function remove() {
```
```
 
```

        // Check if all required data are set or not

        if( !isset( $_POST['nonce'] ) || !isset( $_POST['post_id'] ) ) {

```
            wp_die();
```
```
        }
```
```
 
```
```
        // Verify nonce
```

        if( !wp_verify_nonce( $_POST['nonce'], 'ts_ets_nonce' ) ) {

```
            wp_die();
```
```
        }
```
```
 
```
```
        $id = $_POST['post_id'];
```
```
 
```
```
        delete_post_thumbnail( $id );
```
```
 
```

        echo sprintf( '<button type="button" class="button-primary ts-ets-add" data-id="%s">%s</button>', esc_attr( $id ), $this->add_new_str );

```
 
```
```
        wp_die();
```
```
 
```
```
    }
```
```
 
```
```
}
```
```
 
```
```
new doocii_Easy_Thumbnail_Switcher();
```

以下代码保存为 script.js，保存至主题名/js 目录下

```
(function($) {
```
```
 
```
```
    "use strict";
```
```
 
```

    if( typeof ts_ets === 'undefined' ) {

```
        window.ts_ets = {};
```
```
        ts_ets.upload_frame = false;
```
```
    }
```
```
 
```

    $(document).on( 'click', 'button.ts-ets-remove', function() {

```
 
```

        ts_ets.tmp_id = $(this).data('id');

        ts_ets.tmp_parent = $(this).closest('td.ts-ets-option');

```
 
```

        if( !confirm( ets_strings.confirm ) ) {

```
            return;
```
```
        }
```
```
 
```
```
        $.ajax({
```
```
            url: ajaxurl,
```
```
            method: "POST",
```
```
            data: {
```

                action: 'ts_ets_remove',

                nonce: $('#ts_ets_nonce').val(),

```
                post_id: ts_ets.tmp_id
```
```
            },
```
```
            success: function( data ) {
```
```
                if( data != '' ) {
```

                    ts_ets.tmp_parent.HTML( data );

```
                }
```
```
            }
```
```
        });
```
```
 
```
```
    });
```
```
 
```
```
    $(document).ready(function() {
```
```
 
```

        ts_ets.upload_frame = wp.media({

            title: ets_strings.upload_title,

```
            button: {
```

                text: ets_strings.upload_add,

```
            },
```
```
            multiple: false
```
```
        });
```
```
 
```

        ts_ets.upload_frame.on( 'select', function() {

```
 
```

            ts_ets.selection = ts_ets.upload_frame.state().get('selection');

```
 
```

            ts_ets.selection.map( function( attachment ) {

```
                if( attachment.id ) {
```
```
                    $.ajax({
```
```
                        url: ajaxurl,
```
```
                        method: "POST",
```
```
                        data: {
```

                            action: 'ts_ets_update',

                            nonce: $('#ts_ets_nonce').val(),

                            post_id: ts_ets.tmp_id,

                            thumb_id: attachment.id

```
                        },
```

                        success: function( data ) {

                            if( data != '' ) {

                                ts_ets.tmp_parent.html( data );

```
                            }
```
```
                        }
```
```
                    });
```
```
                }
```
```
            });
```
```
 
```
```
        });
```
```
 
```
```
    });
```
```
 
```

    $(document).on( 'click', 'button.ts-ets-add', function(e) {

```
 
```
```
        e.preventDefault();
```
```
 
```

        ts_ets.tmp_id = $(this).data('id');

        ts_ets.tmp_parent = $(this).closest('td.ts-ets-option');

```
 
```
```
        if( ts_ets.upload_frame ) {
```
```
            ts_ets.upload_frame.open();
```
```
        }
```
```
 
```
```
    });
```
```
 
```
```
})(jQuery);
```

类别：WordPress教程、

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