How to add odd_or_even automatically in the for loop

In every for loop in my application I do something like this

    <%  odd_or_even = 0
        for event in @events
            odd_or_even = 1 - odd_or_even
     %>

I know there are some ways around to that by having automatic javascript
and
other solutions. But we support a large number of browsers and can’t be
sure
everyone has the latest browser so we have settled with this solution.

I was wondering if there is a way for me to open the for loop
functionaliyty and add this feature

  1. Every time the for loop starts initialize odd_or_even to zero.
  2. Change the value everytime the loop is executed.
  3. Make this varialbe odd_or_even visible exactly the way event is
    visible.

Any suggestions.

Thanks
-=-

everyone has the latest browser so we have settled with this solution.

I was wondering if there is a way for me to open the for loop
functionaliyty and add this feature

  1. Every time the for loop starts initialize odd_or_even to zero.
  2. Change the value everytime the loop is executed.
  3. Make this varialbe odd_or_even visible exactly the way event is visible.

cycle() might be what you’re looking for…

http://api.rubyonrails.org/classes/ActionView/Helpers/TextHelper.html#M000518

<%- for item in @items do -%>
<tr class="<%= cycle(“even”, “odd”) %>">
… use item …

<%- end -%>

Not sure if this applies to your problem, but have you looked at cycle
()? I use it to alternate row colors in tables:

<% [1,2,3,4].each do |a| %>
<% CSSclassName = cycle(“even”, “odd”) %>

<%= a %>

-Jason


Jason F. - jfrankov at pobox dot com
main 310-601-8454
cell 415-254-4890

Not entirely clear on what you’re looking for, so I’m not sure if this
will work for you, but I use odd? to generate alternating rows:

<% @records.each_with_index do |record, i| %>


<%=h record.field_1 %>
etc.

<% end %>

Thanks.

Both the suggestions are neat.

-=-

I think I just figured out a more elegant way of doing this.

class Array
def each_with_index_parity
self.each_with_index do |entry, index|
yield(entry, index, index % 2 == 0 ? 0 : 1)
end
end
end

This lets you write:

<% @records.each_with_index_parity do |record, i, parity| %>


<%=h record.field_1 %>
etc.

<% end %>

Or, if you prefer, you could put the class names right in the iterator:

class Array
def each_with_index_parity
self.each_with_index do |entry, index|
yield(entry, index, index % 2 == 0 ? ‘even’ : ‘odd’)
end
end
end

Which gives you:

<% @records.each_with_index_parity do |record, i, parity| %>


<%=h record.field_1 %>
etc.

<% end %>

Just a matter of taste, I guess.

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