Saturday, November 10, 2007
Rails: Integer#even?
Documentation
None
Usage
The Integer#even? method is helpful when adding zebra striping to views.
For example:
Test
None
Usage
The Integer#even? method is helpful when adding zebra striping to views.
For example:
<% @customers.each_with_index do |customer, index| %>
<div style="color:<%= index.even? ? "white" : "gray" %>">
<%= customer.name %>
</div>
<% end %>
Test
unit_tests do
test "10 is even?" do
assert_equal true, 10.even?
end
endLabels: activesupport, rails
Comments:
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The above usage assumes you have rows that are never deleted. To ensure that the "zebra striping" always occurs one should look into the cycle method provided by rails:
http://api.rubyonrails.org/classes/ActionView/Helpers/TextHelper.html#M000634
http://api.rubyonrails.org/classes/ActionView/Helpers/TextHelper.html#M000634
# posted by 
: 4:32 PM
: 4:32 PM
The above comment is not entirely accurate. "Each with index" refers to the array @customers, that is populated from the controller. "Index" refers to the "index" in the array, not the ActiveRecord ID from the database.
I agree, though, on the point about cycle. Cycle is much more powerful inside an iteration of a loop because it accepts a variable amount of values:
<div style="color:<%= cycle("white", "gray", "red")" %> >
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I agree, though, on the point about cycle. Cycle is much more powerful inside an iteration of a loop because it accepts a variable amount of values:
<div style="color:<%= cycle("white", "gray", "red")" %> >
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