Is it ok to use drop-down menus in a Mobile Website which opens on clicking? Like http://ux.stackexchange.com
I don't think there is a simple answer here. Some of the pro's and con's that you need to think through to decide on the subjective issue of what is best for your application are:
- Easily extendible
- Familiar to most users (this is arguably more for desktop apps)
- They encourage lazy UX design
- They don't lend themselves to scanning well (little shape or position information for people to go for)
- Low discoverability. You have to click on it to know what is there.
That said there are many applications where it does make sense to use them, the most common probably being the Safari browser taskbar.
As a general rule though I would avoid using them unless absolutely necessary. Too often they are taken as an easy way out of a UX problem when there are better solutions.