We offer a (not currently open source) different approach in a Pro version performance build which has node-specific features (offloading hard work to a child process and processing row by row), sacrificing compatibility for I have tried to reach you about this PRO version ( ) sending an email, but I had no answer. ![]() We offer a (not currently open source) different approach in a Pro version performance build which has node-specific features (offloading hard work to a child process and processing row by row), sacrificing compatibility for performance. The read data from Excel file is displayed in HTML Table using JavaScript. ![]() Once File is selected in FileUpload control, it is read as Binary data and then the Binary data is read using the xlsx Excel plugin. To read an Excel File this way first you need to read that file as a binary string using the FileReader API then youll read that binary string using the SheetJS functionnalities. ![]() There are insurmountable limits (a 90MB file can sometimes hide multi-GB files) that would require platform-specific features and would break compatibility with older browsers and environments. Here Mudassar Ahmed Khan has explained with an example, how to read and parse Excel file (XLS and XLSX) using JavaScript. Any sort of alleged streaming-based tool that works in the browser has to do a level or two of buffering behind the scenes. So to get at the data, we need to perform an unzip operation and have random access to the individual files within the ZIP (it's possible to stream each individual file, but we need to be able to process them in a specific order, starting from the manifest file, in order to properly understand the spreadsheet). ![]() Long story short: the document-based approach taken here does not scale to very large as stated in that comment, XLSX is a ZIP-based format.
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