cycle(first_value, *values) public

Returns a Cycle object whose to_s value cycles through items of an array every time it is called. This can be used to alternate classes for table rows: 

 <%- for item in @items do -%> <tr class="<%= cycle("even", "odd") %>"> ... use item ... </tr> <%- end -%>

You can use named cycles to prevent clashes in nested loops. You’ll have to reset the inner cycle, manually: 

 <%- for item in @items do -%> <tr class="<%= cycle("even", "odd", :name => "row_class") <td> <%- for value in item.values do -%> <span style="color:'<%= cycle("red", "green", "blue" :name => "colors") %>'"> item </span> <%- end -%> <%- reset_cycle("colors") -%> </td> </tr> <%- end -%>
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April 20, 2009
2 thanks

Cycle with first and last

I needed a cycle that was also aware of the first and last items in the collection. This is adapted from a snippet I found while Googling:

def cycle_with_first_last(object, collection, options = { }) addition = "" addition += " #{options[:first]}" if object == collection.first addition += " #{options[:last]}"if object == collection.last cycle(options[:odd], options[:even]) + addition end

Just put that in your helpers…

September 11, 2008
1 thank

CSS columns

You can also use this in a partial to create blocks of content into columns without setting a fixed height. This one is two columns.

.clear { clear: both;} .block { float:left;width:200px;} <div class="block">

<p>Content Item</p>

</div> <%= cycle("", "<div class=\"clear\"></div>") -%>