file-read-sample.txt

$(document).on('change', '#clientupload', function () {
    var x = document.getElementById("clientupload");
    if ('files' in x) {
      if (x.files.length > 0) {
        //only one file accepted
        for (var i = 0; i < 1; i++) {
          var myFile = x.files[0];
          var reader = new FileReader();
          reader.readAsText(myFile);
          reader.onload = function () {
            window.sessionStorage.setItem(STORAGE_KEY, reader.result);
            $('#clientId').val(null);
            $('#reset-file').show();
          }
        }
      }
    }
  });