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一直以来,wordpress的后台的分类目录没有添加缩略图的功能,一般情况下,也没什么,毕竟很多网站也用不上这些。但有些企业网站可能就会需要这个缩略图,它们想在不同的分类目录页面展示不同的缩略图。当然,可以通过指定图片来实现,但那样一业,后期更换图片时,就相对不太灵活。而给wordpress后台分类目录里添加缩略图功能,就显得方便的多——如果想修改哪个分类的缩略图,只需要在后台设置一下就好了,多方便。闲话不多说,一起来看看怎样实现吧。
方法一:非上传形式添加缩略图功能。
//添加缩略图
function salong_add_category_field(){
echo '<div class="form-field">
<label for="thumb">'.__('缩略图','salong').'</label>
<input name="thumb" id="thumb" type="text" value="" size="40">
<p>'.__('输入分类的缩略图链接。','salong').'</p>
</div>';
}
add_action('category_add_form_fields','salong_add_category_field',10,2);
//分类编辑字段
function salong_edit_category_field($tag){
echo '<tr class="form-field">
<th scope="row"><label for="thumb">'.__('灰色地图','salong').'</label></th>
<td>
<input name="thumb" id="thumb" type="text" value="';
echo get_option('thumb-'.$tag->term_id).'" size="40"/><br>
<span class="thumb">'.$tag->name.__('分类的缩略图链接。','salong').'</span>
</td>
</tr>';
}
add_action('category_edit_form_fields','salong_edit_category_field',10,2);
//保存数据
function salong_category_thumb($term_id){
if(isset($_POST['thumb'])){
//判断权限--可改
if(!current_user_can('manage_categories')){
return $term_id;
}
$thumb_key = 'thumb-'.$term_id;
$thumb_value = $_POST['thumb'];
// 更新选项值
update_option( $thumb_key, $thumb_value );
}
}
add_action('created_category','salong_category_thumb',10,1);
add_action('edited_category','salong_category_thumb',10,1);
把上面这段代码添加到主题的functions.php文件中,这样就为wordpress分类目录添加好了缩略图功能。只是这个不是上传图片,而是填写图片url地址。
然后,在wordpress主题前台页面想要添加缩略图的地方调用下面这句:
echo get_option('thumb_color-'.$category_id)
方法二:上传缩略图功能
把下面这段代码添加到wordpress主题 的functions.php文件中:
<?php/*** Plugin Name: 分类图像*/?><?phpif (!defined('Z_PLUGIN_URL'))define('Z_PLUGIN_URL', untrailingslashit(plugins_url('', __FILE__)));define('Z_IMAGE_PLACEHOLDER', get_bloginfo("template_url")."/images/placeholder.jpg");// l10nload_plugin_textdomain('zci', FALSE, 'categories-images/languages');add_action('admin_init', 'z_init');function z_init() {$z_taxonomies = get_taxonomies();if (is_array($z_taxonomies)) {$zci_options = get_option('zci_options');if (empty($zci_options['excluded_taxonomies']))$zci_options['excluded_taxonomies'] = array();foreach ($z_taxonomies as $z_taxonomy) {if (in_array($z_taxonomy, $zci_options['excluded_taxonomies']))continue;add_action($z_taxonomy.'_add_form_fields', 'z_add_texonomy_field');add_action($z_taxonomy.'_edit_form_fields', 'z_edit_texonomy_field');add_filter( 'manage_edit-' . $z_taxonomy . '_columns', 'z_taxonomy_columns' );add_filter( 'manage_' . $z_taxonomy . '_custom_column', 'z_taxonomy_column', 10, 3 );}}}function z_add_style() {echo '<style type="text/css" media="screen">th.column-thumb {width:60px;}.form-field img.taxonomy-image {border:1px solid #eee;max-width:300px;max-height:300px;}.inline-edit-row fieldset .thumb label span.title {width:48px;height:48px;border:1px solid #eee;display:inline-block;}.column-thumb span {width:48px;height:48px;border:1px solid #eee;display:inline-block;}.inline-edit-row fieldset .thumb img,.column-thumb img {width:48px;height:48px;}</style>';}// add image field in add formfunction z_add_texonomy_field() {if (get_bloginfo('version') >= 3.5)wp_enqueue_media();else {wp_enqueue_style('thickbox');wp_enqueue_script('thickbox');}echo '<div class="form-field"><label for="taxonomy_image">' . __('图像', 'zci') . '</label><input type="text" name="taxonomy_image" id="taxonomy_image" value="" /><br/><button class="z_upload_image_button button">' . __('上传/添加图像', 'zci') . '</button></div>'.z_script();}// add image field in edit formfunction z_edit_texonomy_field($taxonomy) {if (get_bloginfo('version') >= 3.5)wp_enqueue_media();else {wp_enqueue_style('thickbox');wp_enqueue_script('thickbox');}if (z_taxonomy_image_url( $taxonomy->term_id, NULL, TRUE ) == Z_IMAGE_PLACEHOLDER)$image_text = "";else$image_text = z_taxonomy_image_url( $taxonomy->term_id, NULL, TRUE );echo '<tr class="form-field"><th scope="row" valign="top"><label for="taxonomy_image">' . __('图像', 'zci') . '</label></th><td><img class="taxonomy-image" src="' . z_taxonomy_image_url( $taxonomy->term_id, NULL, TRUE ) . '" style="width:400px;"/><br/><input type="text" name="taxonomy_image" id="taxonomy_image" value="'.$image_text.'" /><br /><button class="z_upload_image_button button">' . __('上传/添加图像', 'zci') . '</button><button class="z_remove_image_button button">' . __('删除图像', 'zci') . '</button></td></tr>'.z_script();}// upload using wordpress uploadfunction z_script() {return '<script type="text/javascript">jQuery(document).ready(function($) {var wordpress_ver = "'.get_bloginfo("version").'", upload_button;$(".z_upload_image_button").click(function(event) {upload_button = $(this);var frame;if (wordpress_ver >= "3.5") {event.preventDefault();if (frame) {frame.open();return;}frame = wp.media();frame.on( "select", function() {// Grab the selected attachment.var attachment = frame.state().get("selection").first();frame.close();if (upload_button.parent().prev().children().hasClass("tax_list")) {upload_button.parent().prev().children().val(attachment.attributes.url);upload_button.parent().prev().prev().children().attr("src", attachment.attributes.url);}else$("#taxonomy_image").val(attachment.attributes.url);});frame.open();}else {tb_show("", "media-upload.php?type=image&TB_iframe=true");return false;}});$(".z_remove_image_button").click(function() {$("#taxonomy_image").val("");$(this).parent().siblings(".title").children("img").attr("src","' . Z_IMAGE_PLACEHOLDER . '");$(".inline-edit-col :input[name=\'taxonomy_image\']").val("");return false;});if (wordpress_ver < "3.5") {window.send_to_editor = function(html) {imgurl = $("img",html).attr("src");if (upload_button.parent().prev().children().hasClass("tax_list")) {upload_button.parent().prev().children().val(imgurl);upload_button.parent().prev().prev().children().attr("src", imgurl);}else$("#taxonomy_image").val(imgurl);tb_remove();}}$(".editinline").live("click", function(){var tax_id = $(this).parents("tr").attr("id").substr(4);var thumb = $("#tag-"+tax_id+" .thumb img").attr("src");if (thumb != "' . Z_IMAGE_PLACEHOLDER . '") {$(".inline-edit-col :input[name=\'taxonomy_image\']").val(thumb);} else {$(".inline-edit-col :input[name=\'taxonomy_image\']").val("");}$(".inline-edit-col .title img").attr("src",thumb);return false;});});</script>';}// save our taxonomy image while edit or save termadd_action('edit_term','z_save_taxonomy_image');add_action('create_term','z_save_taxonomy_image');function z_save_taxonomy_image($term_id) {if(isset($_POST['taxonomy_image']))update_option('z_taxonomy_image'.$term_id, $_POST['taxonomy_image']);}// get attachment ID by image urlfunction z_get_attachment_id_by_url($image_src) {global $wpdb;$query = "SELECT ID FROM {$wpdb->posts} WHERE guid = '$image_src'";$id = $wpdb->get_var($query);return (!empty($id)) ? $id : NULL;}// get taxonomy image url for the given term_id (Place holder image by default)function z_taxonomy_image_url($term_id = NULL, $size = NULL, $return_placeholder = FALSE) {if (!$term_id) {if (is_category())$term_id = get_query_var('cat');elseif (is_tax()) {$current_term = get_term_by('slug', get_query_var('term'), get_query_var('taxonomy'));$term_id = $current_term->term_id;}}$taxonomy_image_url = get_option('z_taxonomy_image'.$term_id);if(!empty($taxonomy_image_url)) {$attachment_id = z_get_attachment_id_by_url($taxonomy_image_url);if(!empty($attachment_id)) {if (empty($size))$size = 'full';$taxonomy_image_url = wp_get_attachment_image_src($attachment_id, $size);$taxonomy_image_url = $taxonomy_image_url[0];}}if ($return_placeholder)return ($taxonomy_image_url != '') ? $taxonomy_image_url : Z_IMAGE_PLACEHOLDER;elsereturn $taxonomy_image_url;}function z_quick_edit_custom_box($column_name, $screen, $name) {if ($column_name == 'thumb')echo '<fieldset><div class="thumb inline-edit-col"><label><span class="title"><img src="" alt="Thumbnail"/></span><span class="input-text-wrap"><input type="text" name="taxonomy_image" value="" class="tax_list" /></span><span class="input-text-wrap"><button class="z_upload_image_button button">' . __('上传/添加图像', 'zci') . '</button><button class="z_remove_image_button button">' . __('删除图像', 'zci') . '</button></span></label></div></fieldset>';}/*** Thumbnail column added to category admin.** @access public* @param mixed $columns* @return void*/function z_taxonomy_columns( $columns ) {$new_columns = array();$new_columns['cb'] = $columns['cb'];$new_columns['thumb'] = __('图像', 'zci');unset( $columns['cb'] );return array_merge( $new_columns, $columns );}/*** Thumbnail column value added to category admin.** @access public* @param mixed $columns* @param mixed $column* @param mixed $id* @return void*/function z_taxonomy_column( $columns, $column, $id ) {if ( $column == 'thumb' )$columns = '<span><img src="' . z_taxonomy_image_url($id, NULL, TRUE) . '" alt="' . __('Thumbnail', 'zci') . '" class="wp-post-image" /></span>';return $columns;}// change 'insert into post' to 'use this image'function z_change_insert_button_text($safe_text, $text) {return str_replace("Insert into Post", "Use this image", $text);}// style the image in category listif ( strpos( $_SERVER['SCRIPT_NAME'], 'edit-tags.php' ) > 0 ) {add_action( 'admin_head', 'z_add_style' );add_action('quick_edit_custom_box', 'z_quick_edit_custom_box', 10, 3);add_filter("attribute_escape", "z_change_insert_button_text", 10, 2);}// New menu submenu for plugin options in Settings menuadd_action('admin_menu', 'z_options_menu');function z_options_menu() {add_options_page(__('分类图像设置', 'zci'), __('分类图像', 'zci'), 'manage_options', 'zci-options', 'zci_options');add_action('admin_init', 'z_register_settings');}// Register plugin settingsfunction z_register_settings() {register_setting('zci_options', 'zci_options', 'z_options_validate');add_settings_section('zci_settings', __('', 'zci'), 'z_section_text', 'zci-options');add_settings_field('z_excluded_taxonomies', __('排除的分类', 'zci'), 'z_excluded_taxonomies', 'zci-options', 'zci_settings');}// Settings section descriptionfunction z_section_text() {echo '<p>'.__('', 'zci').'</p>';}// Excluded taxonomies checkboxsfunction z_excluded_taxonomies() {$options = get_option('zci_options');$disabled_taxonomies = array('nav_menu', 'link_category', 'post_format');foreach (get_taxonomies() as $tax) : if (in_array($tax, $disabled_taxonomies)) continue; ?><input type="checkbox" name="zci_options[excluded_taxonomies][<?php echo $tax ?>]" value="<?php echo $tax ?>" <?php checked(isset($options['excluded_taxonomies'][$tax])); ?> /> <?php echo $tax ;?><br /><?php endforeach;}// Validating optionsfunction z_options_validate($input) {return $input;}// Plugin option pagefunction zci_options() {if (!current_user_can('manage_options'))wp_die(__( 'You do not have sufficient permissions to access this page.', 'zci'));$options = get_option('zci_options');?><div class="wrap"><?php screen_icon(); ?><h2><?php _e('分类图像设置', 'zci'); ?></h2><form method="post" action="options.php"><?php settings_fields('zci_options'); ?><?php do_settings_sections('zci-options'); ?><?php submit_button(); ?></form></div><?php}
当然,你也可以把上面的代码放到一个单独的文件中,再把这个文件引入到wordpress主题的functions.php文件中。这样,我们就为wordpress主题的分类目录添加好了上传缩略图功能,如下图:
缩略图调用方法:
分类页代码调用:
<img src="<?php if (function_exists('z_taxonomy_image_url')) echo z_taxonomy_image_url(); ?>">在首页或其它页代码调用:
<?php echo z_taxonomy_image_url( $category->term_id); ?>
上面我们介绍了2种方法为wordpress主题分类目录添加缩略图,当然,wordpress插件这么发达,这方面的插件也是很多的,如:http://wordpress.org/plugins/categories-images/这个就是一款很不错的wordpress分类缩略图插件。如果你是代码控,那还是使用我们上面提供的代码吧。
wordpress 主题制作开发视频教程