Web Page downloading questions

Is there a client side way to open a dialog box to select a folder to download files to? I would like the functionality of a "create new folder" function in the dialog box. And once they select a folder to to download to, can I send the direct开发者_如何转开发ory to a javascript function as a string?

Any ideas would be much appreciated.

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JavaScript operates in a SandBox~ it doesn't have access to the file system.