Pseudocode

function addItems ()
listen to the user input
takes the value typed 
stores it in not DOM but an array, or object
and adds it into the shopping list item

function checkToggleItems()
listens to the check button (on the parent div)
checks whether the item has been checked or unchecked
changes the checked attribute to otherwise

function deleteItems()
listens to the delete button (on the parent div)
takes the item out of the shopping list