Core ToDo App with Parse and jQuery

ParseToDo.js

//Parse.initialize("APPLICATION_ID", "JAVASCRIPT_KEY");
//Use your "APPLICATION_ID" and "JAVASCRIPT_KEY" here for Parse.initialize
Parse.initialize('kjhsdhfkjhsd', 'kjhxdkfhkjdhsgjkhdg')
var ToDoObject = Parse.Object.extend("ToDo");

var query = new Parse.Query(ToDoObject);

//Fetch all saved tasks in beginning
query.find({
  success: function(results) {
    console.log("Successfully retrieved " + results.length + " tasks.", results);
    // Do something with the returned Parse.Object values
    for (var i = 0; i < results.length; i++) {
      addTaskToList( results[i] )
    }
  },
  error: function(error) {
    console.error("Error: " + error.code + " " + error.message);
  }
});

//save task on the button click
$(document).on('click', '.change-task-status', function (e) {
  var $checkBox = $(this);
  var taskId = $(this).parent().attr('id');
  var q = new Parse.Query( ToDoObject );
  q.get( taskId, {
    success: function (object) {
      object.set('completed', isChecked )
      object.save();
      $checkBox.parent().remove();
      addTaskToList( object )
    },
    error: function (error) {
      console.error("Error: " + error.code + " " + error.message);
    }
  } )
});

//save task on the button click
$('#saveTask').on('click', function (e) {
  var task = {text: $('#task').val(), timeStamp: new Date(), completed: false };
  console.log( task );
  var todo = new ToDoObject();
  todo.save(task, {
    success: function(object) {
      $(".success").show(function(){
        $('#task').val('');
        //auto hide the success message after 2sec
        setTimeout(function () {
          $('.success').hide();
        }, 2000);
      });

      addTaskToList( object );
      console.log( object );
    },
    error: function(model, error) {
      $(".error").show(function(){
        //auto hide the error message after 2sec
        setTimeout(function () {
          $('.success').hide();
        }, 2000);
      });
    }
  });
})

//function to append the html of task to the task list element
function addTaskToList( taskObjFromParse ) {
  if( taskObjFromParse.get('completed') ){
    //Add to completed tasks list
    $('#completedTaskList').append( prepareTask( taskObjFromParse ) );
  } else {
    //Add to the active tasks list
    $('#taskList').append( prepareTask( taskObjFromParse ) );
  }
}

//Prepare the HTML for individual task from the task object received from parse
function prepareTask( taskObjFromParse ) {
  var strikeClass = taskObjFromParse.get('completed') == true ? 'strikethrough' : '';
  var completed = taskObjFromParse.get('completed') == true ? 'checked' : '';
  return '<li class="task '+ strikeClass +'" id="'+taskObjFromParse.id+'" \
    title="Added on '+taskObjFromParse.get('timeStamp')+'">\
    <input type="checkbox" class="change-task-status" '+ completed +' />\
    '+taskObjFromParse.get('text')+'</li>';
}