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{exp:channel:entries channel="wods" year="{segment_3}" category="{segment_6}" month="{segment_4}" sort="desc"} 

<div class="blogroll-post">
  <h1><a href="http://{site_url}index.php/mojo/wod-entry/{entry_id}">{title}</a></h1>
  <h3>Posted for 
      {categories}
        {if category_id == '9' AND category_id != '11'}Boot Campers
        {if:elseif category_id == '11'  AND category_id != '9'}Veterans
        {if:elseif category_id == '9' AND category_id == '11'}Everyone
        {/if}
      {/categories} 
on {entry_date format="%F %j, %Y"} by {author} |</h3>  <h4><a href="http://{site_url}index.php/mojo/wod-entry/{entry_id}">{comment_total} Comments</a></h4>
<h2>{wod_body}</h2>

<p><!-- end .blogroll-post --></div></p>

<p>{/exp:channel:entries}

The above code will output “Boot CampersVeterans” because some entries are assigned both categories.  However, I would like to output “Everyone” if both categories are assigned.  How can this be accomplished?

You could reverse the order of your conditionals:

{if category_id == '9' AND category_id == '11'}Everyone
{if:elseif category_id == '11'  AND category_id != '9'}Veterans ...

That said, category_id can’t be “9” and “11” at the same time, so that won’t work as such.

Why not?  I can assign two categories.

Although I haven’t figured this out exactly as asked, my workaround was to simply create another category called Both and use its category_id in my conditionals.

BCPower,

While you can certainly assign more than one category per entries, evaluating them is a bit more difficult than that. Inside that categories tag pair it loops through the categories and returns only one each time so it is impossible to evaluate both in a conditional at the same time. It will miss out on the second half of your conditional each time.

Your workaround is a good one though.

This thread is more suitable for the CodeShare Corner so moving there