给WordPress文章添加点赞功能，其基本思路就是给每篇文章添加一个自定义字段，用这个自定义字段存储赞数；在客户端用Cookie存储是否已经点赞的变量。
WP点赞功能的代码
HTML部分：
1 2 3 4 5 6 7 | <a href="javascript:;" data-action="ding" data-id="<?php the_ID(); ?>" class="favorite<?php if(isset($_COOKIE['brain_ding_'.$post->ID])) echo ' done';?>"> <?php _e( '赞', 'buddypress_login' ); ?><span class="count"><?php if( get_post_meta($post->ID,'brain_ding',true) ){ echo get_post_meta($post->ID,'brain_ding',true); } else { echo '0'; }?></span> </a> |
JS部分：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | $(document).ready(function() { $.fn.postLike = function() { if ($(this).hasClass('done')) { return false; } else { var id = $(this).data("id"), action = $(this).data('action'), rateHolder = $(this).children('.count'); rateHolderOut = $(this); $(rateHolder).html("<span class='favorite_wait'> </span>"); var ajax_data = { action: "brain_like", um_id: id, um_action: action }; $.post("/wp-admin/admin-ajax.php", ajax_data, function(data) { $(rateHolder).html(data); $(rateHolderOut).addClass('done'); }); return false; } }; $(document).on("click", ".favorite", function() { $(this).postLike(); }); }); |
PHP部分，放在function.php内
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | add_action('wp_ajax_nopriv_brain_like', 'brain_like'); add_action('wp_ajax_brain_like', 'brain_like'); function brain_like(){ global $wpdb,$post; $id = $_POST["um_id"]; $action = $_POST["um_action"]; if ( $action == 'ding'){ $brain_raters = get_post_meta($id,'brain_ding',true); $expire = time() + 99999999; $domain = ($_SERVER['HTTP_HOST'] != 'localhost') ? $_SERVER['HTTP_HOST'] : false; // make cookies work with localhost setcookie('brain_ding_'.$id,$id,$expire,'/',$domain,false); if (!$brain_raters || !is_numeric($brain_raters)) { update_post_meta($id, 'brain_ding', 1); } else { update_post_meta($id, 'brain_ding', ($brain_raters + 1)); } echo get_post_meta($id,'brain_ding',true); } die; } |
BP点赞功能的代码
给BuddyPress的帖子添加点赞功能，思路也是一样的，但BP的帖子和自定义字段并不保存在WP原来的表中，要读取/操作它们就要用BP自己的API。
区别不大，只是WP用的get_post_meta/update_post_meta函数，要换成bp_activity_get_meta/bp_activity_update_meta
HTML部分：
1 2 3 4 5 6 7 | <a href="javascript:;" data-action="ding_bp" data-id="<?php echo bp_get_activity_id(); ?>" class="favorite<?php if(isset($_COOKIE['brain_ding_bp_'.bp_get_activity_id()])) echo ' done';?>"> <?php _e( '赞', 'buddypress_login' ); ?><span class="count"><?php if( bp_activity_get_meta(bp_get_activity_id(),'brain_ding_bp',true) ){ echo bp_activity_get_meta(bp_get_activity_id(),'brain_ding_bp',true); } else { echo '0'; }?></span> </a> |
JS部分：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | $(document).ready(function() { $.fn.postLike = function() { if ($(this).hasClass('done')) { return false; } else { var id = $(this).data("id"), action = $(this).data('action'), rateHolder = $(this).children('.count'); rateHolderOut = $(this); $(rateHolder).html("<span class='favorite_wait'> </span>"); var ajax_data = { action: "brain_like", um_id: id, um_action: action }; $.post("/wp-admin/admin-ajax.php", ajax_data, function(data) { $(rateHolder).html(data); $(rateHolderOut).addClass('done'); }); return false; } }; $(document).on("click", ".favorite", function() { $(this).postLike(); }); }); |
PHP部分，连同之前的写在一起：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | add_action('wp_ajax_nopriv_brain_like', 'brain_like'); add_action('wp_ajax_brain_like', 'brain_like'); //Auther: Brain1981 - https://blog.brain1981.com function brain_like(){ global $wpdb,$post; $id = $_POST["um_id"]; $action = $_POST["um_action"]; if ( $action == 'ding'){ $brain_raters = get_post_meta($id,'brain_ding',true); $expire = time() + 99999999; $domain = ($_SERVER['HTTP_HOST'] != 'localhost') ? $_SERVER['HTTP_HOST'] : false; // make cookies work with localhost setcookie('brain_ding_'.$id,$id,$expire,'/',$domain,false); if (!$brain_raters || !is_numeric($brain_raters)) { update_post_meta($id, 'brain_ding', 1); } else { update_post_meta($id, 'brain_ding', ($brain_raters + 1)); } echo get_post_meta($id,'brain_ding',true); } if ( $action == 'ding_bp'){ $brain_raters = bp_activity_get_meta($id,'brain_ding_bp',true); $expire = time() + 99999999; $domain = ($_SERVER['HTTP_HOST'] != 'localhost') ? $_SERVER['HTTP_HOST'] : false; // make cookies work with localhost setcookie('brain_ding_bp_'.$id,$id,$expire,'/',$domain,false); if (!$brain_raters || !is_numeric($brain_raters)) { bp_activity_update_meta($id, 'brain_ding_bp', 1); } else { bp_activity_update_meta($id, 'brain_ding_bp', ($brain_raters + 1)); } echo bp_activity_get_meta($id,'brain_ding_bp',true); } die; } |