kevinsa5
commented
7 years ago For anyone searching for help: in the meantime before this is added to bokeh, here's how I implemented sending a file from the user's computer to a Bokeh server:
- Using templates (Bokeh's, Flask's, whatever you're using), insert an HTML file choosing input:
<input id="file-input" type="file"> - Attach a javascript callback to a button that reads the selected file's contents
- If the file is complex like an excel document, you can base64 encode it. If it's something like a text file or a csv, you might as well leave it as-is
- Insert it into a dedicated
ColumnDataSource, treating it as a dictionary to transfer data from browser to server - On the server side, implement an
on_change("data", callback)for the data source - Base64 decode the file if necessary
- If you just need the file contents as a string, you're done. If you need it as a proper file (for instance, to use with
pandas.read_excel), you can wrap it in aStringIOobject to make it file-like
It's a bit complicated, but the upcoming namespace model for Bokeh would make it a bit easier. Feel free to ping me for code samples.
harrispilton
We need to figure out how to load files. There is no "File Open" Dialog out of the box in Bokeh, (see issue), so either we write some extension (probably in JS), or we get creative. Ideas welcome...