In many data-heavy applications, users need to export more than a single spreadsheet. Common reasons to use a ZIP archive include:
: For very large ZIP files, some developers prefer to save the file to a temporary directory on the server and use dcc.send_file() to point the user to that path, though care must be taken to manage temporary storage.
This guide explores how to implement this functionality, common use cases, and technical solutions for handling ZIP archives in Dash applications. Understanding dcc.Download dcc download zip
: Conversely, if a user uploads a ZIP file via dcc.Upload , the application must decode the base64 string and use zipfile.ZipFile to extract the contents for processing. Other Contexts: DCC-EX and File Transfers
: Add a html.Button to trigger the action and a dcc.Download component to handle the result. In many data-heavy applications, users need to export
: For improved performance with small datasets, ZIP files can be generated in the browser using clientside callbacks and libraries like JSZip .
: Downloading a package of generated images, such as multiple Matplotlib plots. Understanding dcc
: Bundling several Excel or CSV files into one download to avoid multiple browser popups.