Динамиччески созданные chekbox и checked

var checkbox = document.createElement('input');
                    checkbox.type = "checkbox";
                    checkbox.name = "name";
                    checkbox.value = "value";
                    checkbox.id = "id"+i;
                    td.appendChild(checkbox);

'use strict';
 
var Checkbox = function (params) {
  var params = params || {};
  this.name = params.name;
  this.checked = params.checked;
}
 
var CheckboxList = function () {
  var list = {};
 
  this.addCheckbox = function (checkbox) {
    if(list[checkbox.name]) {
      console.log('[WARN]: checkbox with this name already present');
      return;
    }
 
    list[checkbox.name] = checkbox;
  }
 
  this.each = function (block) {
    for(var checkbox in list) {
      if(list[checkbox]) block(list[checkbox]);
    }
  }
}
 
var HTMLFactory = function () {
  this.getElement = function (el, block) {
    var element = document.createElement(el);
    if(typeof block == 'function') block(element);
    return element;
  }
  this.getCheckbox = function (checkbox) {
    return this.getElement('input', function (input) {
      input.type = 'checkbox';
      input.name = checkbox.name;
      input.checked = checkbox.checked;
      input.onchange = function () {
        checkbox.checked = this.checked;
      }
    });
  };
}
 
var CheckboxListView = function (params) {
  var el = document.querySelector(params.selector);
  var list = params.list;
  var factory = params.factory;
 
  this.drawTable = function () {
    var newBody = factory.getElement('tbody');
    list.each(function (checkbox) {
      newBody.appendChild(drawRowFor(checkbox));
    });
    el.replaceChild(newBody, el.tBodies[0]);
  }
 
  var drawRowFor = function (checkbox) {
    return factory.getElement('tr', function (tr) {
      tr.appendChild(factory.getElement('td', function (td) {
        td.textContent = checkbox.name;
      }));
      tr.appendChild(factory.getElement('td', function (td) {
        td.appendChild(factory.getCheckbox(checkbox));
      }));
    });
  }
}
 
var App = function (selector) {
  var list = new CheckboxList();
  var view = new CheckboxListView({
    selector: selector,
    factory: new HTMLFactory(),
    list: list
  });
 
  this.addCheckbox = function (params) {
    list.addCheckbox(params);
    view.drawTable();
  }
}
 
var app = new App('.table');
document.querySelector('.addRow').onclick = function () {
  app.addCheckbox({
    name: prompt('Type new checkbox name', '')
  });
}