storing order in drag and drop interfaces -


i guess less direct problem more of implementation question.

for drag , drop interfaces. how people store order of elements being re-arranged. since user expects order preserved when user refreshes page, how store kinda information in relational database or other persistent layer?

a number system seems extraneous requiring multiple updates anytime arranged , couldn't think of nicer system storing information if user doesn't have click "done" or other button after re-ordering. (ie facebook photos)

any appreciated.

one approach linked-list style: each element, store after (or both before , after, doubly linked list). way, when move something, have update affected elements. since don't typically need retrieve, say, 2357th element (more typically need recreate entire list) performance impact should fine.


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