jQuery: Observe an enumerable/selector
<p>Using <code>$("#myTable tr").live("click", someCallback);</code> (although now deprecated) it is fairly simple to subscribe to the click event for newly added table rows.</p>

<p>I would be interested in a way which doesn't only support events but any jQuery commands, something like:</p>

<pre><code>$("myTable tr").live().attr("hello", "world");
</code></pre>

<p>which would add the hello="world" attribute to any newly added table rows. Is there any such thing in jQuery?</p>

<p><strong>Update: Please note</strong>. I want to <em>subscribe</em> to the event of an element being added. I do <em>not</em> control the code which adds it. Take dataTables as a example: The dataTables plug-in creates the table rows.</p>
