Ruby on Rails

Hi all! I want to add alert message via jquery when User clicks <div id="star">star</div>. 

But, It can't work.  

Please teach me some advice.

Thanks!

# posts/index.html.erb

[code]

...

<% @posts.each do |post| %>

  <tr>

    <td><%= post.id %></td>

    <td><%= post.content %></td>

    <td></td>

    <div id="like">

      <td>like</td>

    </div>

    <td><div id="star">star</div></td>

    <td><%= post.created_at.strftime("%Y年%m月%d日%H:%M:%S") %></td>

<% end %>

</tr>

</table>

....

[/code]

# application.js

[code]

$(document).ready(function() {

   $("#star").click(function(){

     alert("add_star");

   })

 });

[/code]

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