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Hi.. i have this project hotel booking.. if the person select a room 2 dropdown appears "adult" and "child" the max adult is 2.. if somebody please can help me.. child option dropdown must only enabled if the first dropdown value is 2.. my problem is if you select more than 1 room the first 2 dropdown works and the following dropdown doesn't work (the loop rooms). <select name="adults[]" class="hbSelect hbSelectorPeople" data-index="<?php echo $j; ?>"> <?php foreach (range(1, $tpl['room_arr']['adults']) as $i) { $selected = ( isset($STORE['all_rooms'][$_GET['room_id']][$j]) && $STORE['all_rooms'][$_GET['room_id']][$j]['adults'] == $i ); ?><option value="<?php echo $i; ?>"<?php echo !$selected ? NULL : ' selected="selected"'; ?>><?php echo $i; ?></option><?php } ?> </select> </td> <td class="hbBorderBottom"> <select name="children[]" class="hbSelect hbSelectorPeople" data-index="<?php echo $j; ?>"> <?php foreach (range(0, $tpl['room_arr']['children']) as $i) { $selected = ( isset($STORE['all_rooms'][$_GET['room_id']][$j]) && $STORE['all_rooms'][$_GET['room_id']][$j]['children'] == $i ); ?><option value="<?php echo $i; ?>"<?php echo !$selected ? NULL : ' selected="selected"'; ?>><?php echo $i; ?></option><?php } ?> </select> Can someone help me make a validation in a looping script to enable only the 2nd dropdown if first dropdown value is 2.