Bootstrap collapse within table/between table rows not working - ruby-on-rails

Question

I have a question regarding the Bootstrap collapse feature. I'm pretty sure that I'm overlooking something quite obvious or easy to fix, but I googled it alot and played with the code, but without success.
I have a "account settings" page, where all account information of a user is shown in a table-like format, with the table cells of the last table column always containing an "edit"-button to edit that information. When people click "edit", an edit form shall expand just beneath that table row.
I followed the scheme at http://twitter.github.com/bootstrap/javascript.html#collapse , the collapse function itself works fine, but the problem is that each form always expands above my table, regardless of which edit button I click on. I made a screenshot of how it looks like. http://imageshack.us/photo/my-images/834/problemyn.png/ Instead of being above the whole table I want it to expand just beneath the specific row, pushing the lower rows down.
Here my code:
<table class="table">
<tbody>
<tr>
<td>Username</td>
<td><%= #user.name %></td>
<td><button class="btn btn-danger" data-toggle="collapse" data-target="#username">Edit</button></td>
</tr>
<div id="username" class="collapse">
<div class="row">
<div class="span6 offset3">
<%= form_for(#user) do |form| %>
<%= render 'shared/error_messages', object: form.object %>
<%= form.label :name, "Change Username" %>
<%= form.text_field :name %>
<%= form.submit "Save changes", class: "btn btn-primary" %>
<% end %>
</div>
</div>
</div>
<tr>
<td>Email</td>
<td><%= #user.email %></td>
<td><button class="btn btn-danger" data-toggle="collapse" data-target="#email">Edit</button></td>
</tr>
<div id="email" class="collapse">
<div class="row">
<div class="span6 offset3">
<%= form_for(#user) do |form| %>
<%= render 'shared/error_messages', object: form.object %>
<%= form.label :email, "Change Email" %>
<%= form.text_field :email %>
<%= form.submit "Save changes", class: "btn btn-primary" %>
<% end %>
</div>
</div>
</div>
<tr>
<td>Password</td>
<td>Last time updated: <%= #user.updated_at %></td>
<td><button class="btn btn-danger" data-toggle="collapse" data-target="#password">Edit</button></td>
</tr>
<div id="password" class="collapse">
<div class="row">
<div class="span6 offset3">
<%= form_for(#user) do |form| %>
<%= render 'shared/error_messages', object: form.object %>
<%= form.label :password, "Change Password" %>
<%= form.text_field :password %>
<%= form.label :password_confirmation, "Confirm Password" %>
<%= form.password_field :password_confirmation %>
<%= form.submit "Save changes", class: "btn btn-primary" %>
<% end %>
</div>
</div>
</div>
<tr>
<td>Language</td>
<td>English</td>
<td><button class="btn btn-danger" data-toggle="collapse" data-target="#language">Edit</button></td>
</tr>
<div id="language" class="collapse">
<div class="row">
<div class="span6 offset3">
<!-- code for language form -->
</div>
</div>
</div>
<tr>
<td>Avatar</td>
<td><%= avatar_status %></td>
<td><button class="btn btn-danger" data-toggle="collapse" data-target="#demo">Edit</button></td>
</tr>
<div id="demo" class="collapse">
<div class="row">
<div class="span6 offset3">
<%= form_for(#user) do |form| %>
<%= form.label :avatar %>
<%= form.file_field :avatar %>
<%= form.submit "Add avatar", class: "btn btn-primary" %>
<% end %>
</div>
</div>
</div>
</tbody>
</table>

Answer 1

To collapse a table row, you should write extra css for the collapsed row:
table .collapse.in {
display: table-row !important;
}
It will fix the display issue after the row expanded.

Answer 2

Hi I'm sorry I won't have a satisfying answer. It is not allowed to have anything other than <tr> elements as descendants of <tbody> so your HTML is not valid. This is what causes the glitchy behavior. Your best bet is to wrap every part of your form in a new table element.