sfmc_cloudpages_de_creator

*/Created by Jason Hanshaw/*
For reference: https://salesforce.stackexchange.com/questions/283339/how-to-insert-csv-file-record-inside-data-extension-from-cloud-page

<form method="post" action="YOUR PROCESSING PAGE" id="csv_upload">
   <p>
      Upload File:
   </p>
   <input id="csvUpload" type="file" name="file"/>
   <input type="hidden" maxlength="" name="csv" id="csv" value="" />
   <br/>
   <br/>
   <button id="button" type="submit">Submit</button>
</form>
<script >
function uploadDealcsv() {};
uploadDealcsv.prototype.getCsv = function(e) {
  let input = document.getElementById('csvUpload');
  input.addEventListener('change', function() {
    if (this.files && this.files[0]) {
      var myFile = this.files[0];
      var reader = new FileReader();
      reader.addEventListener('load', function(e) {
        let csvdata = e.target.result;
        parseCsv.getParsecsvdata(csvdata);
      });
      reader.readAsBinaryString(myFile);
    }
  });
}
uploadDealcsv.prototype.getParsecsvdata = function(data) {
  let parsedata = [];
  let newLinebrk = data.split("\n");
  for (let i = 0; i < newLinebrk.length; i++) {
    parsedata.push(newLinebrk[i].split(","))
  }
  document.getElementById("csv").value = parsedata;
}
var parseCsv = new uploadDealcsv();
parseCsv.getCsv();
</script>