
While developing a Classified Ads application I ran into an interesting issue while building the Submit New Ad form. I wanted to assign a category and a subcategory to the ad (Click here for an Example). I was doing this by using two dropdown lists. The problem arises after you select your choice in the first list. Say you chose Automobiles. In the second list you have subcategories that contain everything but the kitchen sink. Really, you only want the Automobile related subcategories to show up in the list.
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