Button.on_click behavior?

[ahuang11]

I suppose FileInput should not be used with on_click. Check out this:

panel.widgets.FileInput maximum file size?

Many thanks to @greg_nordin and @okz for this discussion as it helped me a lot, though it didn’t directly solve my problem. I thought it was a file size problem but it wasn’t directly. I had implemented a watcher to trigger off a change in the FileInput widget and then have a callback function. I triggered off “filename” but this was causing a timing issue where my callback function was called when the filename had changed but the file had not loaded and therefore the FileInput.value was None…