For some reason when I type into the input field to add a to do event, it shows up blank.. can you help me out as to why

//Problem: User interaction doesnt provide desired results.
//Solution: add interactivity so user can manage daily tasks.


var taskInput = document.getElementById("new-task"); //new-task
var addButton = document.getElementsByTagName("button")[0]; //first button
var incompleteTasksHolder = document.getElementById("incomplete-tasks"); //incomplete-tasks
var completedTasksHolder = document.getElementById("completed-tasks"); //completed-tasks

//New task Liste Item
var createNewTaskElement = function(taskString) {
  //Create List Item
  var listItem = document.createElement("li");

  //input (checkbox)
  var checkBox = document.createElement("input"); //checkbox
    //label
  var label = document.createElement("label");
    // input (text)
  var editInput = document.createElement("input");

  //button.edit
  var editButton = document.createElement("button"); 
  //button.delete
  var deleteButton = document.createElement("button");

  //Each elements, needs modifying

  checkBox.type = "checkbox";
  editInput.type = "text";

  editButton.innerText = "Edit";
  editButton.className = "edit";
  deleteButton.innerText = "Delete";
  deleteButton.className = "delete";

  //Each element needs appending
  listItem.appendChild(checkBox);
  listItem.appendChild(label);
  listItem.appendChild(editInput);
  listItem.appendChild(editButton);
  listItem.appendChild(deleteButton);

  return listItem;
}

//Add a new Task
var addTask = function() {
  console.log("Add task...");
  //Create a new list item with text from #new-task:
  var listItem = createNewTaskElement(taskInput.value);
  //Append listItem to incompleteTasksHolder
  incompleteTasksHolder.appendChild(listItem);
  bindTaskEvents(listItem, taskCompleted);
}

//Edit an existing Task
var editTask = function () {
  console.log("Edit task...");

  var listItem = this.parentNode;

  var editInput = listItem.querySelector("input[type=text]");
  var label = listItem.querySelector("label");

  var containsClass = listItem.classList.contains("editMode");
    //if the class of the parent is .editMode
  if(containsClass) {
   //switch from .editMode
   //label text become the input's value
    label.innerText = editInput.value;
  }else {
   //switch to .editMode
   //input value becomes the label's text
    editInput.value = label.innerText;
  }
  //Toggle .editMode on list item
  listItem.classList.toggle("editMode");
}

//Delete an existing Task
var deleteTask = function () {
  console.log("Delete task...");
  var listItem = this.parentNode;
  var ul = listItem.parentNode;
  // Remove the parent list item from the ul
  ul.removeChild(listItem);
}

//Mark a task as complete
var taskCompleted = function () {
  console.log("Task Incomplete...");
  //Append the task list item to the completed-tasks
  var listItem = this.parentNode;
  completedTasksHolder.appendChild(listItem);
  bindTaskEvents(listItem, taskIncomplete);
}


//Mark a task as incomplete
var taskIncomplete = function () {
  console.log("Task Complete...");
  //Append the task list item to the uncomplete-tasks
  var listItem = this.parentNode;
  incompleteTasksHolder.appendChild(listItem);
  bindTaskEvents(listItem, taskCompleted);
}


var bindTaskEvents = function(taskListItem, checkBoxEventHandler) {
  console.log("Bind list item events");
   //select taskListItem's children
  var checkBox = taskListItem.querySelector("input[type=checkbox]");
  var editButton = taskListItem.querySelector("button.edit");
  var deleteButton = taskListItem.querySelector("button.delete");

  //bind editTask to edit button
  editButton.onclick = editTask;

  //bind deleteTask to delete button
  deleteButton.onclick = deleteTask;

  //bind checkBoxEventHandler to the checkbox
  checkBox.onchange = checkBoxEventHandler;
}

//Set the click handler to the addTask function
addButton.onclick = addTask;

//cycle over incompleteTasksHolder ul list items
for(var i=0; i<incompleteTasksHolder.children.length; i++){
  //bind events to list item's children (taskCompleted)
  bindTaskEvents(incompleteTasksHolder.children[i], taskCompleted);
}

for(var i=0; i<completedTasksHolder.children.length; i++){
  //bind events to list item's children (taskIncomplete)
  bindTaskEvents(completedTasksHolder.children[i], taskIncomplete);
}