HTW: Doodle prefill Dates configurable time slots

htw-doodle-slots.js

window.__startDate = function(startHours, startMinutes) {
  dateStr = $('.timesTable .first').data('date-string').toString();
  date = new Date(dateStr.substr(0, 4), dateStr.substr(4, 2), dateStr.substr(6, 2));
  date.setHours(startHours);
  date.setMinutes(startMinutes);
  return date;
};

window.__dateIncMinutes = function(date, minutes) {
  var ms = date.getTime();
  var newDateMs = ms + (1000 * 60 * minutes);
  return new Date(newDateMs);
};

window.__add = function() {
  $('#add-timeslots').click();
};

window.__fillOut = function(limit, startDate, minutesPerSlot) {
  var nextDate = startDate;
  $('.time-field.form-control').each(function(i, el) {
    var slot = i+1;
    if(slot > limit) return;
    var hoursString = nextDate.getHours().toString();
    var minutesString = nextDate.getMinutes().toString();
    if(hoursString.length == 1) {
      hoursString = '0' + hoursString;
    }
    if(minutesString.length == 1) {
      minutesString = '0' + minutesString;
    }
    var nextDateString = hoursString + ':' + minutesString;
    $el = $(el);
    $el.val(nextDateString);
    nextDate = __dateIncMinutes(nextDate, minutesPerSlot);
  });
};

window.__start = function() {
  var time = window.prompt('Time? E.g. 16:30', '16:30');
  var minutesPerSlot = parseInt(window.prompt('How many minutes per Slot?', '5'));
  var hours = time.split(':')[0];
  var minutes = time.split(':')[1];
  var startDate = __startDate(hours, minutes);
  setTimeout(window.__add, 200);
  setTimeout(window.__add, 400);
  setTimeout(window.__add, 600);
  setTimeout(function() { window.__fillOut(10, startDate, minutesPerSlot) }, 800);
};

__start();