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InputFile

Wolfram Kernel
Execution environment
Notebook`Kernel`Inputs`
Context
wljs-inputs
Package
InputFile[opts___] _EventObject

outputs as a drag & drop file-form used to handle file input

Options​

"Label"​

A text label for an element

"Description"​

A description label for an element

Event generation​

It accepts single or multiple files. The whole pipeline is separated into two steps

  1. Initiation of a transaction. Emits an event with a topic "Transaction", which has the following structure
<|"Id"->uid_String, "Length"->numberOfFiles_Integer|>
  1. Sending files one by one files emitting "File" event that follows the structure
<|"Transaction"->uid_String, "Name"->filename_String, "Data"->base64_String|>

Example​

A simple file-form to plot the data from the uploaded file

plot = Plotly[<|"type"->"line"|>]
EventHandler[InputFile[], {"File" -> Function[file,
  Module[{},
    imported = Drop[ImportByteArray[file["Data"]//BaseDecode, "CSV"], 3];
    (* try different encoding *)
    If[!NumberQ[imported[[1,1]]], imported = Drop[ImportByteArray[file["Data"]//BaseDecode, "TSV"], 3]];

    Plotly`addTraces[plot, {<|"x" -> imported[[All,1]], "y" -> imported[[All,2]]|>}];
  ]
  
]}]
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