jacksons like a fairly lush enviroment and misting is important even inside. most serious keepers employ an automatic misting system such as a mistking or similar, it is usually set up on a precise timer to mist an ultra fine spray at regular intervals, several times a day, and because of the water it generates, it usually incorporates some sort of plastic catch tray or pan/drainage arrangement. there is a wide variety of low flow misting nozzles that emit a fairly precise pattern of distribution, some limit the pattern to 18" diameter or less, and seconds timer can limit the misting intervals to a matter of seconds, so a well thought out misting system will limit almost all of the water to the confines of the cage, where it is then caught by the drainage system and carried usually to a bucket or even outside, making it possible to tailor your water output and distribution fairly precisely. a system like that is better understood if you view it in action, there are lots of mistking and other misting system videos on you tube
http://www.youtube.com/watch?v=1Q4VX9usMxs&feature=related. and watching several of them may give you a better idea of how they operate and how to set up your own system. a basic misting system with seconds timer and a single nozzle can be had for as little as $130 (+a few extras like buckets and such). a system like this allows your animals to be misted precisely and confidently while you are busy, or at work, or away for the weekend, it is probably the best route to go if you are able. however, thats not to say that jacksons or any other chameleons cant be kept successfully without one. many members have successfully kept chameleons for years and misted only by hand. ordinary household trigger spray bottles do not have enough capacity and require too much trigger pulling to be practical. you can get a hand held 1/2 gallon pump sprayer at your local home center for under $10. just because you have a dripper you should not assume that your animal is getting all of the hydration it needs, often times animals wont start drinking until they have been misted for several minutes. and dehydrated jacksons have sometimes been known to stare at a dripper for hrs without taking a drink. oddly, enough a severely dehydrated animal may refuse to drink altogether, so its important to stay on top of it before it comes an issue. many members also heat their misting water, which can be as simple as placing a under tank heater under your spray bottle or misting resevoir, but thats a whole nother subject. imo jacksons should be misted a minimum of 3x a day religiously, which can make hand misting impractical if you have a job or real life, but if one has the time and the patience to do it day in and day out, then there is nothing wrong with hand misting, if you can keep up with it. even with just a dripper drainage can be an issue, most commercial cages come with some sort of plastic sheet for the bottom of the cage, but this does little to contain the water. one solution is to (first remove the plastic sheet) carefully heat the center 6" of the plastic with a hairdryer/heat gun until the plastic is very very soft, and then you can carefully push a pencil (point first) down through the plastic, this will create a depression in the plastic to funnel the water and create a hose barb that you can put a piece of tubing onto, of course you will need to cut a small x in the bottom screen and modify your stand if necessary, but then you will be able to drain to a bucket. it should be noted that this works better on some plastic liners than others. jmo
But I live in a very Dry climate. and I have kept and breed Jacksons for many many years. I use drippers and some misting. and have given up on trying to humidify areas ( it just dont work well here. average humidities for my areas is 20% to 40%) 
