方法1、Categories Images插件。
Categories Images是一款扩展wordpress分类功能、添加分类图片的插件,该插件支持默认wordpress的文章类型,也支持wordpressP自定义文章类型以及多站点。这个插件使用比较简单,可以轻松上手,这里就不多做介绍 ,网上这方面的 次料很多。
方法2、代码实现。
个人还是比较喜欢直接代码实现,这样做,既可以让网站不会有太多的插件而影响速度,也可以让wordpress主题集成更多的功能,这也是wordpress控们比较喜欢的方式,这就不多说了。其实,代码也是从插件中提练出来的,只是做了一些相应的改动。
第一步:在主题functions.php文件中添加如下代码:
- /**
- * Plugin Name: 分类图像
- */
- define('Z_IMAGE_PLACEHOLDER', T_PATH."/img/random/5.jpg"); //默认缩略图
- add_action('admin_init', 'z_init');
- function z_init() {
- $z_taxonomies = get_taxonomies();
- if (is_array($z_taxonomies)) {
- $zci_options = get_option('zci_options');
- if (emptyempty($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_' . $z_taxonomy . '_custom_column', 'z_taxonomy_column', 10, 3 );
- }
- }
- }
- // add image field in add form
- function z_add_texonomy_field() {
- if (get_bloginfo('version') >= 3.5)
- wp_enqueue_media();
- else {
- wp_enqueue_style('thickbox');
- wp_enqueue_script('thickbox');
- }
- }
- // 在编辑表单中添加图像字段
- function z_edit_texonomy_field($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( $taxonomy->term_id, NULL, TRUE );
- echo '<tr class="form-field">
- <th scope="row" valign="top"><label for="taxonomy_image">图像</label></th>
- <td><input type="text" name="taxonomy_image" id="taxonomy_image" value="'.$image_text.'" />
- <button class="z_upload_image_button button">上传/添加图像</button>
- <button class="z_remove_image_button button">删除图像</button>
- <img class="taxonomy-image" src="' . $image_text . '" width="150" height="auto"/>
- </td>
- </tr>'.z_script();
- }
- // 图片上传函数
- function z_script() {
- return '<script type="text/javascript">
- jQuery(document).ready(function($) {
- 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("");
- }
- $(".inline-edit-col .title img").attr("src",thumb);
- return false;
- });
- });
- </script>';
- }
- // 保存分类图像,同时编辑或保存期限
- add_action('edit_term','z_save_taxonomy_image');
- add_action('create_term','z_save_taxonomy_image');
- function z_save_taxonomy_image($term_id) {
- if(isset($_POST['taxonomy_image']))
- update_option('z_taxonomy_image'.$term_id, $_POST['taxonomy_image']);
- }
- // 通过图片网址获取附件
- function z_get_attachment_id_by_url($image_src) {
- global $wpdb;
- $query = "SELECT ID FROM {$wpdb->posts} WHERE guid = '$image_src'";
- $id = $wpdb->get_var($query);
- return (!emptyempty($id)) ? $id : NULL;
- }
- // 对于给定的term_id得到分类图像的URL(默认占位符图像)
- function z_taxonomy_image_url($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(!emptyempty($taxonomy_image_url)) {
- $attachment_id = z_get_attachment_id_by_url($taxonomy_image_url);
- if(!emptyempty($attachment_id)) {
- if (emptyempty($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;
- else
- return $taxonomy_image_url;
- }
- function z_quick_edit_custom_box($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</button>
- <button class="z_remove_image_button button">删除图像</button>
- </span>
- </label>
- </div>
- </fieldset>';
- }
- // 缩略图列添加到类别管理
- function z_taxonomy_columns( $columns ) {
- $new_columns = array();
- $new_columns['cb'] = $columns['cb'];
- $new_columns['thumb'] = '图像';
- unset( $columns['cb'] );
- return array_merge( $new_columns, $columns );
- }
- // 缩略图列值添加到类别管理。
- function z_taxonomy_column( $columns, $column, $id ) {
- if ( $column == 'thumb' )
- $columns = '<span><img src="' . z_taxonomy_image_url($id, NULL, TRUE) . '" alt="Thumbnail" class="wp-post-image"/></span>';
- return $columns;
- }
- // “更改”插入“使用该图像”
- function z_change_insert_button_text($safe_text, $text) {
- return str_replace("Insert into Post", "Use this image", $text);
- }
- // 在类别列表中的图像
- if ( 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);
- }
- // 注册插件设置
- function z_register_settings() {
- register_setting('zci_options', 'zci_options', 'z_options_validate');
- add_settings_section('zci_settings', '', 'z_section_text', 'zci-options');
- add_settings_field('z_excluded_taxonomies', '排除的分类','z_excluded_taxonomies', 'zci-options', 'zci_settings');
- }
- function z_add_style() {
- echo '<style type="text/css" media="screen">
- th.column-thumb {width:60px;}
- .form-field #taxonomy_image {border:1px solid #eee;width:200px; margin-left:30px;}
- .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;}
- label{ font-weight:800; font-size:16px;}
- .taxonomy-image {border:1px solid #eee;width:auto !important;height:60px; margin-bottom:-40px; }
- #taxonomy_image{ margin-left:180px; }
- #taxonomy_image,.z_upload_image_button,.z_remove_image_button{vertical-align:bottom !important;}
- </style>';
- }
如果觉得代码比较多,也可以把它放到一个单独的php文件中,然后,再在functions.php文件中引用它。
第二步:在前台页面模板中调用这个分类缩略图。
在当前分类目录页面调用代码:
- <img src="<?php if (function_exists('z_taxonomy_image_url')) echo z_taxonomy_image_url(); ?>">
或者
- <?php if (function_exists('z_taxonomy_image_url')&&(z_taxonomy_image_url()!="")){ ?><img src="<?php echo z_taxonomy_image_url(); ?>"><?php } ?>
在其它页面调用代码:这里需要我添加一个分类目录ID号
- <img src="<?php if (function_exists('z_taxonomy_image_url')) echo z_taxonomy_image_url(栏目ID号); ?>">
或者
- <?phpif(function_exists('z_taxonomy_image_url')&&(z_taxonomy_image_url(栏目ID号)!='')) {
- $img_url = z_taxonomy_image_url(栏目ID号);
- }
- else {
- $img_url = T_PATH.'/img/banner/catt.jpg';
- //默认图片
- }?><img src="<?php echo $img_url;?>" alt=""/>
通过上面的代码,我们就实现了在wordspress分类目录中添加了缩略图功能模块,如果你也想让自己的网站主题的不同分类目录显示不同的banner图片的话,那就不防用一用上面的2种方法,从此你的网站就与众不同哦。