support dcc.send_file and dcc.send_data_frame #112

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1. kafisatz commented on Jul 1, 2021

   

   kafisatz

   on Jul 1, 2021

   Author

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   turns out that for a DataFrame -> csv file, there is quite a simple workaround

   callback!(app,
               Output("download-modelresult","data"),            
               Input("btn-download-model-results", "n_clicks"),
               prevent_initial_call = true
           ) do n_clicks
       
       df = DataFrames.DataFrame(a=rand(3),b=["a","b","xx"])
       csvrowwriteriterator = CSV.RowWriter(df)
       str = join(collect(csvrowwriteriterator))
       return Dict("filename"=>"miha.csv","content"=>str ,"base64"=>false)
   
   end 
   
2. kafisatz commented on Jul 1, 2021

   

   kafisatz

   on Jul 1, 2021

   Author

   More actions

   similarly for any file on disk, this works for me

   #send file from disk 
               file_from_disk = raw"c:\temp\temp.7z"
               #file_from_disk = raw"c:\temp\png1.png"
               rf = read(file_from_disk)
               io = IOBuffer()
               iob64_encode = Base64.Base64EncodePipe(io)
               write(iob64_encode,rf)
               close(iob64_encode)
               str = String(take!(io))
               #String(Base64.base64decode(str))
               fn = splitdir(file_from_disk)[2]
               return Dict("filename"=>fn,"content"=>str,"base64"=>true)
   
3. waralex

   linked a pull request that will close this issueHelper functions #144on Nov 3, 2021
4. waralex

   closed this as completedin #144on Nov 10, 2021