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My client's application has a table that users would love to copy and paste part of an Excel spreadsheet into.
Is anyone doing that or something similar in VF?
In theory, you can use a Rich Text Area or a Text Area that users can copy-paste into. The former can be parsed with some XmlStreamReader functionality, while the latter can be easily manipulated with some tab-delimited processing code. The only real limitations here is your imagination (and governor limits). You can further stretch your Visualforce power by mixing in some JavaScript.