WordPress增加ajax点赞功能

functions.php

add_action('wp_ajax_nopriv_bigfa_like', 'bigfa_like');
add_action('wp_ajax_bigfa_like', 'bigfa_like');
function bigfa_like() {
    global $wpdb,$post;
    $id = $_POST["um_id"];
    $action = $_POST["um_action"];
    if ( $action == 'ding') {
        $bigfa_raters = get_post_meta($id,'bigfa_ding',true);
        $expire = time() + 99999999;
        $domain = ($_SERVER['HTTP_HOST'] != 'localhost') ? $_SERVER['HTTP_HOST'] : false;
        // make cookies work with localhost
        setcookie('bigfa_ding_'.$id,$id,$expire,'/',$domain,false);
        if (!$bigfa_raters || !is_numeric($bigfa_raters)) {
            update_post_meta($id, 'bigfa_ding', 1);
        } else {
            update_post_meta($id, 'bigfa_ding', ($bigfa_raters + 1));
        }
        echo get_post_meta($id,'bigfa_ding',true);
    }
    die;
}

js文件

<script type="text/javascript">
    $.fn.postLike = function() {
        if ($(this).hasClass('done')) {
            return false;
        } else {
            $(this).addClass('done');
            var id = $(this).data("id"),
            action = $(this).data('action'),
            rateHolder = $(this).children('.count');
            var ajax_data = {
                action: "bigfa_like",
                um_id: id,
                um_action: action
            };
            $.post("/wp-admin/admin-ajax.php", ajax_data,
            function(data) {
                $(rateHolder).html(data);
            });
            return false;
        }
    };
    $(document).on("click", ".favorite",
    function() {
        $(this).postLike();
    });
</script>

HTML指定位置

<div class="post-like">
    <a href="javascript:;" data-action="ding" data-id="<?php the_ID(); ?>"
    class="favorite<?php if(isset($_COOKIE['bigfa_ding_'.$post->ID])) echo ' done';?>">
        喜欢
        <span class="count">
            <?php if( get_post_meta($post->
                ID,'bigfa_ding',true) ){ echo get_post_meta($post->ID,'bigfa_ding',true);
                } else { echo '0'; }?>
        </span>
    </a>
</div>

CSS代码

.post-like{text-align:center;padding:10px}
.post-like a{background-color:#21759B;border-radius:3px;color:#FFFFFF;font-size:12px;padding:5px 10px;text-decoration:none;outline:none}
.post-like a.done,.post-like a:hover{background-color:#eee;color:#21759B}
.post-like a.done{cursor:not-allowed}