Adding Twitter bootstrap styling to Rails form helpers

Question

After reading the answer which suggested I use Simple_form gem with bootstrap integration, I installed it and created my form according to simple_form instructions, but the input boxes are floating right.

This is the layout. The form is being called with the partial 'shared/reg'

 <div class="container">

  <div class="row">
   <div class="span8"><%= yield %></div>
   <div class="span4">
   <%= render 'shared/reg' %>
   </div>

  </div>
</div>

This is my simple form form

<%= simple_form_for("user", :url => main_app.user_registration_path, :html => { :class => "form-horizontal" } ) do |f| %>
  <%= f.input :name %>
<%= f.input :vote, :collection => [ "For", "Against", "Undecided"] %>
  <%= f.input :country,  :collection => [ "Canada", "Iceland", "Other"] %>
  <%= f.input :email %>
   <%= f.input :image, :as => :file %>
    <%= f.input :password %>
  <%= f.input :password_confirmation %>
 <%= f.button :submit %>
<% end %>

Below you can see how the input boxes are floating right in relation to the submit button.

Update

Answer 1

Rather than using the .form-actions class, which wraps the submit button in gray block (which might not work for your page design), you can also wrap the button in a control group like this:

  <div class="control-group">
    <div class="controls">
      <%= f.button :submit %>
    </div>
  </div>

This is only really needed if you're using the .form-horizontal class on the form itself.

If you're looking for a drop-in replacement form builder that outputs bootstrap-style markup for Rails, you might want to check out a gem that I put together to handle this sort of thing:

https://github.com/potenza/bootstrap_form

Here's how you'd setup a horizontal-style form with the submit button properly lined up:

<%= bootstrap_form_for(@user, html: { class: 'form-horizontal' }) do |f| %>
  <%= f.text_field :email %>
  <%= f.password_field :password %>
  <%= f.password_field :password_confirmation, label: 'Confirm Password' %>
  <%= f.control_group do %>
    <%= f.primary "Save User" %>
  <% end %>
<% end %>

This is the example output:

<form accept-charset="UTF-8" action="/users" class="form-horizontal" id="new_user" method="post">
  <div class="control-group">
    <label class="control-label" for="user_email">Email</label>
    <div class="controls">
      <input id="user_email" name="user[email]" size="30" type="text" />
    </div>
  </div>
  <div class="control-group">
    <label class="control-label" for="user_password">Password</label>
    <div class="controls">
      <input id="user_password" name="user[password]" size="30" type="password" />
    </div>
  </div>
  <div class="control-group">
    <label class="control-label" for="user_password_confirmation">Confirm Password</label>
    <div class="controls">
      <input id="user_password_confirmation" name="user[password_confirmation]" size="30" type="password" />
    </div>
  </div>
  <div class="control-group">
    <div class="controls">
      <input class="btn btn-primary" name="commit" type="submit" value="Save User" />
    </div>
  </div>
</form>