How to make file_uploader with accept_multiple_files show only unique files

Using Streamlit
,
1

I need that only the single file to be displayed here, because others are duplicates.

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It would be great if you also tell me how to clean file_uploader session of duplicates.

2

Hi @intolighter,

The only way to remove an uploaded file without exiting or refreshing the app is for the user to click the “x” button – in other words, this isn’t possible programmatically.

Caroline

3

Hi @intolighter,
This could be solved by resetting uploader’s key every time after upload

  import streamlit as st
  
  if 'ctr' not in st.session_state:
      st.session_state['ctr'] = 0
  
  if 'docs' not in st.session_state:
      st.session_state['docs'] = []
  
  def uploader_callback():
      if st.session_state[st.session_state['ctr']] is not None:
          new_files = st.session_state[st.session_state['ctr']]
          for i in new_files:
              st.session_state['docs'].append(i.name)
          st.session_state['ctr'] += 1
  
  st.file_uploader(
      label="File uploader", on_change=uploader_callback, key=st.session_state['ctr'], accept_multiple_files= True
  )
  
  st.write(st.session_state)

And streamlit automatically forgets old keys so no need to worry about that also

1 Like
4

Hi @intolighter
Programmatically, there’s no way to remove an uploaded file without requiring the user to click the “x” button. This means that you must manually interact with the interface to delete the file, and it cannot be done automatically through code. So it’s an easy step to follow.
Hope it will help you

5

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