app/views/sessions/_form_for_redeemify_code.erb
<div>
<dialog id="dialog-window" class="dialog-window mdl-dialog">
<h4 class="mdl-dialog__title"></h4>
<div class="mdl-dialog__content">
<% if @vendor_user %>
<div class="button-single">
<div class="row1">
<%= link_to "Change to vendor", '/sessions/change_to_vendor',
{:id => "change_to_vendor" , :style => 'color:#000'} %>
</div>
</div>
<% end %>
<div class="redeemify-code-input" id="code-form">
<%= form_tag("/sessions/customer", method: "get") do %>
<div class="field_text mdl-textfield mdl-js-textfield
mdl-textfield--floating-label">
<div class="mdl-textfield__label">
<%= label_tag(:code, "Enter your code:") %>
</div><br/>
<%= text_field_tag(:code, nil, class: "mdl-textfield__input") %>
</div><br/>
<div class="mdl-dialog__actions">
<%= submit_tag "Submit", :id => "submit",
class: "redeem-submit-button mdl-button mdl-button--raised" %>
<%= link_to (button_tag 'Cancel', :type => 'button',
:class => 'mdl-button close'), '/' %>
</div>
<% end %>
</div>
</div>
</dialog>
<button id="show-dialog" class="show-dialog mdl-button mdl-js-button
mdl-button--raised mdl-button--colored mdl-js-ripple-effect">
Redeem your code!
</button>
</div>