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copied!<p>Well, nobody responded, but after a few days I solved my own problem. Basically the loop structure I came up with <em>was</em> correct. But there were a few missing pieces.</p> <p>I added break statements to a couple of the if statements. Because each marker could have several values for a given category, it might loop through once and find a match and set the "surfaceMatches" flag to true. But then it would loop through again and check the next value in the category, find it wasn't a match, and set the flag to false. So putting in the break caused the for loop to stop after a category match.</p> <p>Also, at the end I had gmarkers[i].show(); . It should have been gmarkers[k].show().</p> <p>And lastly, I realized that when I set up my "category OK" flags, I set them all to false. This was okay, except that what if the user left a particular category blank? Then the matching loops would never be executed, and the flags would remain false. So I added some statements to check if a category didn't have any values checked, then set the OK flag to true, like this:</p> <p>if (surfaceChecked.length < 1) { surfaceOK = true; }</p> <p>If you want to see the code in action, go here: <a href="http://www.joshrenaud.com/pd/trails_withcheckboxes5.html" rel="nofollow">http://www.joshrenaud.com/pd/trails_withcheckboxes5.html</a></p> <p>Probably nobody cares about any of that. But this might be helpful:</p> <p>As a javascript novice, I did come across a debugging tool that made all the difference for me and helped me find my mistakes: www.webmonkey.com/2010/02/javascript_debugging_for_beginners/</p> <p>Using those log(); statements was VERY handy, although the output got pretty long with all the nested loops in my javascript.</p>

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