FileReader
reader.readAsText()
Description
The FileReader object allows apps to read files into memory. Depending on the platform, files can be flat text, photos, movies or other types of files. Certain platforms restrict which files can be opened. Photo Libraries, DropBox, iCloud Drive and Google drive files can usually be opened.
The file to be opened has to be selected by the user from a TextBox control, with inputType set to File. It is not possible to hard code a file name: this is for security purposes. Otherwise, web apps would be able to open files on user's systems that should not be allowed.
The FileReader control can read files, but cannot write them.
To use this function, first create a reader object by called new FileReader.
Example
Dim reader
reader = new FileReader();
Function txtFilename_onchange()
reader.readAsText(txtFilename.files[0])
End Function
Function reader_onload(e)
Dim lines()
txtData.text = ""
txtData.text = txtData.text & "Filename: " & txtFilename.files[0].name & vbCRLF
txtData.text = txtData.text & "Size: " & txtFilename.files[0].size & vbCRLF
txtData.text = txtData.text & "Modified: " & txtFilename.files[0].lastModifiedDate & vbCRLF
lines = Split(e.target.result, vbLF)
txtData.text = txtData.text & "Lines: " & Len(lines) & vbCRLF
For i = 0 To 50
txtData.text = txtData.text & lines(i) & vbCRLF
Next
End Function
Output
(nextAction appears 3 seconds later)