How can I display every 4th product with different markup?

Question

I'm just starting out with Ruby from a java background. I'm trying to code a particular loop but can't figure out the right syntax:

Could someone help me troubleshoot this please? I'm trying to write a loop but use different css classes to change the style of each block.

Realise this is probably easy, but help is appreciated....

    <%= @products.each do |product, i| %>
    <% if i % 1 %>
    <div class="items-row clearfix">
      <div class="one_fourth">
            <div class="item-thumb">
                <a href="" title=""><img src="<%= image_path "thumb.png" %>" alt="" class="thumb" width="162" height="230" /></a>
            </div>
            <p><%= product.name %></p>
            <p class="bold">$79.95 AUD</p>
            <p class="color-wrap">
                <span class="color" style="background:#ddd;"></span>
                <span class="color" style="background:#f9f9f9;"></span>
                <span class="color" style="background:green;"></span>
                <span class="color" style="background:red;"></span>
            </p>
        </div> 
    <% elsif i % 4 %>
    <div class="one_fourth last">
        <div class="item-thumb">
            <a href="#" title=""><img src="<%= image_path "thumb.png" %>" alt="" class="thumb" width="162" height="230" /></a>
        </div>
        <p><%= product.name %></p>
        <p class="bold">$79.95 AUD</p>
    </div>
    </div><!-- end row -->
    <% else %>
        <div class="one_fourth">
            <div class="item-thumb">
                <a href="#" title=""><img src="<%= image_path "thumb.png" %>" alt="" class="thumb" width="162" height="230" /></a>
            </div>
            <p>Item Name</p>
            <p class="bold">$79.95 AUD</p>
        </div>
    <% end %>
<% end %>

Answer 1

You can do something like this using cycle :

<% products.each_slice(4) do |slice| %>
  <div class="items-row clearfix">
    <% slice.each_with_index do |product,i| %>
      <div class="one_fourth <%= cycle("first", "second", "third", "fourth") %>">
        <%= render product %>
        <% if i != 3 %>
          <p class="color-wrap">
            <span class="color" style="background:#ddd;"></span>
            <span class="color" style="background:#f9f9f9;"></span>
            <span class="color" style="background:green;"></span>
            <span class="color" style="background:red;"></span>
          </p>
        <% end %>
      </div>
    <% end %>
  </div>
<% end %>

_product.html.erb:

<div class="item-thumb">
  <a href="" title=""><img src="<%= image_path "thumb.png" %>" alt="" class="thumb" width="162" height="230" /></a>
</div>
<p><%= product.name %></p>
<p class="bold">$79.95 AUD</p>

Answer 2

Rather than if/else statements and CSS markup in your views, you should probably externalize your CSS, make a few partials, and make use of ActionView::Helpers::TextHelper#cycle . For example:

<%= @products.each do |product| %>
  <div class="<%= cycle('first', 'second', 'third', 'fourth') -%>">
    <!-- 1. let the CSS class handle display differences -->
    <!-- 2. render a partial based on #current_cycle     -->
    <%= render :partial => current_cycle %>        
  </div>
<% end %>

Answer 3

I'd say the mod's are your problem. It's never going to go into the first block as n%1 will always return 0. Try your logic out using irb to get you going.

Answer 4

你可能想尝试jQuery nth-child

Answer 5

I got part of the answer. Slight change of syntax to use "each_with_index" instead of just each.

Still trying to work out there's a lot of variations of when a product can be the last tile and require closing, first on row, first in set, last in a row.....

Thanks guys, I think I've answered my own question.