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I have cats with tree hierarchy, for example, country->city. So that you should first choose country, and then city.
Or big catalog for products. You should choose several “folders”, to get for specific product.
Yahoo’s answers have this:
And some business catalogs sites with big products lists.
I have all cats in php and can pass them to javascript.
How can I Implement it on one page? Is there any jquery plugin for this?
We call this problem as cascading dropdowns problem. You can search on google as
cascading dropdowns using jQuery
cascasding dropdowns Ajax
to get several examples.