一个非常有用的功能，能够帮助您在WordPress中提高不少的效率。所以今天就给大家分享一篇基于WordPress默认上传的快速选择特色图像功能。

如果你的主题不支持缩略图请首先在functions.php中添加

add_theme_support( 'post-thumbnails' );

一、在后台文章列表添加数组

复制下面的代码到你的functions.php中

/*
 * 添加数组到文章列表
 */
add_filter('manage_post_posts_columns', 'lb_featured_image_column');
function lb_featured_image_column( $column_array ) {
	$column_array = array_slice( $column_array, 0, 1, true )
	+ array('featured_image' => '特色图像')
	+ array_slice( $column_array, 1, NULL, true );
 
	return $column_array;
}
 
/*
 * 使用钩子完善数组
 */
add_action('manage_posts_custom_column', 'lb_render_the_column', 10, 2);
function lb_render_the_column( $column_name, $post_id ) {
	if( $column_name == 'featured_image' ) {
		if( has_post_thumbnail( $post_id ) ) {
			$thumb_id = get_post_thumbnail_id( $post_id );
			echo '<img data-id="' . $thumb_id . '" src="' . wp_get_attachment_url( $thumb_id ) . '" />';
		} else {
			echo '<img data-id="-1" src="' . get_stylesheet_directory_uri() . '/placeholder.png" />';
		}
	}
}

二、添加一些CSS来美化数组

add_action( 'admin_head', 'lb_custom_css' );
function lb_custom_css(){
 
	echo '<style>
		#featured_image{
			width:120px;
		}
		td.featured_image.column-featured_image img{
			max-width: 100%;
			height: auto;
		}
 
		/* some styles to make Quick Edit meny beautiful */
		#lb_featured_image .title{margin-top:10px;display:block;}
		#lb_featured_image a.lb_upload_featured_image{
			display:inline-block;
			margin:10px 0 0;
		}
		#lb_featured_image img{
			display:block;
			max-width:200px !important;
			height:auto;
		}
		#lb_featured_image .lb_remove_featured_image{
			display:none;
		}
	</style>';
 
}

完成以上步骤时，可以查看效果

三、添加JavaScript使特色图像可以快速编辑和更新
首先排队加载WordPress默认上传

add_action( 'admin_enqueue_scripts', 'lb_include_myuploadscript' );
function lb_include_myuploadscript() {
	if ( ! did_action( 'wp_enqueue_media' ) ) {
		wp_enqueue_media();
	}
}

然后添加快速编辑字段

add_action('quick_edit_custom_box',  'lb_add_featured_image_quick_edit', 10, 2);
function lb_add_featured_image_quick_edit( $column_name, $post_type ) {
 
	if ($column_name != 'featured_image') return;
	echo '<fieldset id="lb_featured_image" class="inline-edit-col-left">
		<div class="inline-edit-col">
			<span class="title">特色图像</span>
			<div>
				<a href="#" class="lb_upload_featured_image">设置特色图像</a>
				<input type="hidden" name="_thumbnail_id" value="" />
			</div>
			<a href="#" class="lb_remove_featured_image">移除特色图像</a>
		</div></fieldset>';
 
}

最后就是更新保存，复制代码

add_action('admin_footer', 'lb_quick_edit_js_update');
function lb_quick_edit_js_update() {
 
	global $current_screen;
	if (($current_screen->id != 'edit-post') || ($current_screen->post_type != 'post'))
		return;
 
		?><script>
		jQuery(function($){
 
			$('body').on('click', '.lb_upload_featured_image', function(e){
				e.preventDefault();
				var button = $(this),
				 custom_uploader = wp.media({
					title: '设置特色图像',
					library : { type : 'image' },
					button: { text: '设置特色图像' },
				}).on('select', function() {
					var attachment = custom_uploader.state().get('selection').first().toJSON();
					$(button).html('<img src="' + attachment.url + '" />').next().val(attachment.id).parent().next().show();
				}).open();
			});
 
			$('body').on('click', '.lb_remove_featured_image', function(){
				$(this).hide().prev().val('-1').prev().html('设置特色图像');
				return false;
			});
 
			var $wp_inline_edit = inlineEditPost.edit;
			inlineEditPost.edit = function( id ) {
				$wp_inline_edit.apply( this, arguments );
 				var $post_id = 0;
				if ( typeof( id ) == 'object' ) { 
					$post_id = parseInt( this.getId( id ) );
				}
 
				if ( $post_id > 0 ) {
					var $edit_row = $( '#edit-' + $post_id ),
							$post_row = $( '#post-' + $post_id ),
							$featured_image = $( '.column-featured_image', $post_row ).html(),
							$featured_image_id = $( '.column-featured_image', $post_row ).find('img').attr('data-id');
 
 
					if( $featured_image_id != -1 ) {
 
						$( ':input[name="_thumbnail_id"]', $edit_row ).val( $featured_image_id ); // ID
						$( '.lb_upload_featured_image', $edit_row ).html( $featured_image ); // 图像 HTML
						$( '.lb_remove_featured_image', $edit_row ).show(); // 移除链接
 
					}
				}
 		}
	});
	</script>
<?php
}

至此教程结束。