upl.js

var str = ""
var text = ""
const set = new Set();

document.getElementById('input-file')
  .addEventListener('change', getFile)


function getFile(event) {
	const input = event.target
  if ('files' in input && input.files.length > 0) {
	  placeFileContent(
      document.getElementById('content-target'),
      input.files[0])
  }
}


function placeFileContent(target, file) {
	readFileContent(file).then(content => {
  	target.value = content
  }).catch(error => console.log(error))
}


function readFileContent(file) {
 const reader = new FileReader()
 return new Promise((resolve, reject) => {
	 reader.onload = event => resolve(event.target.result)
	 reader.onerror = error => reject(error)
	 reader.readAsText(file)
 })
}
function readFileContent(file) {
 const reader = new FileReader()
 return new Promise((resolve, reject) => {
	 reader.onload = event => resolve(event.target.result)
	 reader.onerror = error => reject(error)
	 reader.readAsText(file)
 })
}
function readFileContent(file) {
 const reader = new FileReader()
 return new Promise((resolve, reject) => {
	 reader.onload = event => resolve(event.target.result)
	 reader.onerror = error => reject(error)
	 reader.readAsText(file)
 })
}