I'm about to make a html/css/js/jquery page and I want it to contain collapsible, movable boxes/divs. Each box will typically contain a table or a graph and the idea is that the user should be able to choose which ones he wants to see and where to place them (i.e. 'windows'). My hope, and belief, is that this has been done before? So i don't have to ;) Anybody has any pointers?
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Doing a simple google search for "JQuery Windows" (a search that can probably be repeated should the following url be deactivated at some point in time), I found the following link to a page that does exactly what you're describing: http://hernan.amiune.com/labs/jQuery-Windows-Engine-Plugin/jQuery-Windows-Engine-Plugin.html
JQuery UI also provides functionality for creating dialog boxes which could potentially function as you describe. If both the first link I provided goes down as does the JQuery UI link then you might have to redo the wheel... unless perhaps at that time you can find a copy of an old version of JQuery UI.
Using JQuery UI can be as simple as:
Of course on the JQuery UI website there is plenty of documentation which provides additional details on how to use their feature set.