这是那些令人沮丧的错误之一，它可以工作，然后它不起作用，并且没有通过 Firebug 提供任何调试提示。
我有一个“媒体室”页面，允许用户查看 YouTube 视频，如果是会员，还可以对视频发表评论。当我加载触发器时， .on('click'...) 触发器按预期工作。但是，如果用户选择另一个视频，我 .empty() 并替换触发器。动态添加后，不再产生警报。
该页面可以在http://dev.edrtrust.com/play/index.php/media/media_room的开发服务器上看到，我正在谈论的触发器是视频正上方的“评论（0）”。
html/jQuery 代码包含：
<div id="content_right">
<div id="videoInfo">
<?php if( $cntVids > 0){ ?>
<p class="vTitle"><?= $vids[0]['title']; ?></p>
<p class="vArtist"><?= $vids[0]['artist']; ?></p>
<p class="vPost">
<?= "Posted by " . $vids[0]['first_name'] . " " .
$vids[0]['last_name'] . " on " .
substr($vids[0]['postDate'],0,10); ?>
</p>
<p>Views: <?= $vids[0]['views']; ?></p>
<?php } else { ?>
<p class="vNone">There are no videos available.<br><br>Please choose another artist from the drop-down menu to the left.</p>
<?php } // end if ?>
<div id="adminPick" style="display:none;">
<img src="<?= base_url('assets/images/ppm_pick.png'); ?>" />
</div> <!-- END adminPick DIV -->
<br><br>
<div class="commentControls">
<?php
//print_r($vids[0]);
$cntComments = $this->content->countMediaComments( $vids[0]['media'] );
?>
<table class="tblCommentsControl" align="center" border="0" width="800px" style="margin-left:20px;">
<tr>
<td style="width:50%;text-align:left;">
<h6 class='lynx btnComments' name="<?= $vids[0]['media']; ?>">
Comments (<span class='cnt'><?= $cntComments; ?></span>)
</h6>
</td>
<td style="width:50%;text-align:center;">
<?php if( $_SESSION['loggedIn'] && $_SESSION['loggedIn'] == 'true'){ ?>
<h6 class='lynx btnAddCom' name="<?= $vids[0]['media']; ?>">
Add Comment
</h6>
<?php } else { ?>
<h6>Login or register to comment.</h6>
<?php } // end if ?>
</td>
</tr>
</table>
</div> <!-- END commentControls DIV -->
</div> <!-- END videoInfo DIV -->
jQuery：
$('h6.btnComments').on('click', function(e){
var media_id = $(this).attr('name');
alert(media_id);
}); // end comment button click
最后，通过 AJAX，我在选择新视频时替换上面的内容（这是行不通的）
public function get_media_by_tube(){
$id = $this->input->post( 'ytID' );
$vids = $this->content->getMediaByYT( $id );
$cntComments = $this->content->countMediaComments( $vids[0]['media'] );
//echo $this->db->last_query();
//print_r($vids);
echo "<p class='vTitle' name='" . $vids[0]['id']. "'>" . $vids[0]['title'] . "</p>";
echo "<p class='vArtist' name='" . $vids[0]['is_featured'] . "'>" . $vids[0]['artist'] . "</p>";
echo "<p class='vPost'>Posted by ";
echo $vids[0]['first_name'] . " " . $vids[0]['last_name'];
echo " on " . substr($vids[0]['postDate'],0,10) . "</p>";
echo "<p>Views: " . $vids[0]['views'] . "</p>";
echo "<div id='adminPick' style='display:none;'>";
echo "<img src='base_url('assets/images/ppm_pick.png')' />";
echo "</div> <!-- END adminPick DIV -->";
echo "<br><br>";
echo "<div class='commentControls'>";
echo "<table class='tblCommentsControl' align='center' border='0' width='800px' style='margin-left:20px;'>";
echo "<tr>";
echo "<td style='width:50%;text-align:left;'>";
echo "<h6 class='lynx btnComments' name='" . $vids[0]['media'] . "'>";
echo "Comments (<span class='cnt'>" . $cntComments . "</span>)";
echo "</h6></td>";
echo "<td style='width:50%;text-align:center;'>";
if( $_SESSION['loggedIn'] && $_SESSION['loggedIn'] == 'true'){
echo "<h6 class='lynx btnAddCom' name='" . $vids[0]['media'] . "'>";
echo "Add Comment";
echo "</h6>";
} else {
echo "<h6>Login or Register to Comment</h6>";
} // end if
echo "</td>";
echo "</tr></table></div> <!-- END commentControls DIV -->";
} // end json_get_media_by_tube function
任何和所有的帮助表示赞赏。