JQuery AJAX append to appended element

I am using RoR with AJAX to create posts. So I need an ability to add an 'answers' by previous id.

Every time submit button clicked following code being called

$("<%= selector %>").append("<div id='<%= newanswer %>'><%= escape_javascript(render('answer_layout')) %></div>");
 

where

selector looks like this #answer-12

newanswer would be #answer-13

First time it works as suggested, but when I click submit second time I need to use already appended #answer-13 div to append newly #answer-14, and it doesn't work. I understand that document doesn't know about first appended element, but have no idea how to resolve this issue. Thanks for any help.

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