8 Questions
What is the purpose of the code snippet var span = document.createElement("SPAN");?
To create a close button for each list item
What happens when the close button is clicked on a list item?
The list item is hidden from view
What is the purpose of the event listener in the code list.addEventListener('click', function(ev) {...})?
To toggle the 'checked' class on a list item
What is the purpose of the newElement() function?
To create a new list item
What is the condition for the alert message to be displayed?
When the input field is empty
What is the purpose of the getElementsByClassName("close") method?
To get all elements with the class 'close'
What happens when the 'Add' button is clicked?
A new list item is created and appended to the list
What is the purpose of the appendChild() method in the code?
To add a new child node to a parent node
Study Notes
Creating and Managing List Items
- The code creates a "close" button and appends it to each list item using
document.getElementsByTagName("LI")and aforloop. - The close button is a
<span>element with a class of "close" and a Unicode character\u00D7as its text content. - Clicking on the close button hides the current list item by setting its parent element's
displayproperty to"none".
Toggling List Items
- The code adds a "checked" symbol when clicking on a list item using an event listener on the
</span><ul><li>element. - The event listener toggles the
"checked"class on the list item when it is clicked.
Creating New List Items
- The
newElement()function creates a new list item when the "Add" button is clicked. - The function creates a new
</li><li>element and appends it to the<ul><li>element with an ID of"myUL". - The text content of the new list item is taken from the input field with an ID of
"myInput". - The function also appends a close button to the new list item.
Create a to-do list app using JavaScript, where users can add and remove tasks. This quiz will test your understanding of JavaScript concepts like document object model manipulation and event handling.
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