如何选择使用name属性动态生成的元素

Question

我有一个论坛页面的php代码，当评论发布时动态生成回复按钮，如下所示：

<?php
        require("includes/conn.php");
        $stmt=$conn->prepare("SELECT post_id, user, topic, post, time FROM post_tb ORDER BY time DESC");
            $stmt->execute();
            $result = $stmt->get_result();
            $num_of_rows = $result->num_rows;
            if ($num_of_rows > 0){
                while ($row = $result->fetch_assoc()){
                    $post_id = $row['post_id'];
                    $user = $row['user'];
                    $topic = $row['topic'];
                    $post = $row['post'];
                    $time = $row['time'];
                    $time = date('M dS, Y g:i A', strtotime($time));
                    echo '<div>
                            <div>
                                <h5><strong>'.$user.'</strong></h5><h6>'.$time.'</h6>
                                <h5><strong>'.ucfirst($topic).'</strong></h5>
                                <p data-id="'.$post_id.'">'.$post.'</p>
                            </div>      
                            <div>
                                <button type="button" class="btn btn-primary rep" name="'.$post_id.'">Reply</button>
                            </div>
                            <form id="comment_reply" data-id="'.$post_id.'" method="post" >
                                <input type="text" class="hidden" value="'.$post_id.'" id="post_id">
                                <input type="text" class="hidden" value="'.$user.'" id="user">
                                <textarea class="form-control" rows="3" name="’.$post_id.'" "></textarea>
                                <button type="submit" class="btn btn-primary"  name = “'.$post_id.'” id="post_rep_sub">Submit</button>
                            </form>
                        <div/>';
                    }
                }
    ?>

现在我需要在jquery中的事件处理中选择带有name属性的回复按钮（因为它是动态生成的唯一性）：

var postId = $('form input#post_id').val();
$(document).on('click', 'button[name="+postId+"]', function(e){
    e.preventDefault();
alert(“worked!”);

我在控制台中不断收到语法无效错误。有人请指导我。我知道有些事情我做错了但却无法弄明白。