Document preview library in JavaScript/rails

Is there any开发者_Go百科 JavaScript/rails library/gem/plug-in to preview document(.doc, pdf, xls and most common doc types) on web page?

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Mozilla is working on a PDF renderer written in JavaScript. For other common types, you can convert them to PDF format on the server side using OpenOffice/LibreOffice by installing the cups-pdf virtual printer and then print your document via OpenOffice:

oowriter -pt pdf your_word_file.doc

See this question.