Problem
When displaying data you need to alternate the background colour of the rows to differentiate them.
Solution
Use an incremented variable or currentrow (for query objects) and % (MOD) the value with 2.
Detailed explanation
<cfset i = 0>
<td class="#IIF(i%2, DE("style1"), DE("style2"))#">
#rowdata#
</td>
<cfset i++>
% (MODULUS) returns the remainder of a division, so anything divisible by 2 (even numbers) will return 0 (false), any odd numbers will return a remainder (not 0 - true) and you can use this to alternate rows. You could extend this to every 2 rows to be alternated by changing i%2 to i%3 in the above example.
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