JavaScript Tutorial: Creating a To-Do List

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Questions and Answers

What is the purpose of the script that creates a 'close' button and appends it to each list item?

To add a new list item to the existing list

To display the list items in a random order

To remove the current list item when clicked (correct)

To toggle the 'checked' symbol on a list item

What is the event that triggers the 'checked' symbol to be added to a list item?

When a new list item is created

When the 'Add' button is clicked

When the 'close' button is clicked

When a list item is clicked (correct)

What is the purpose of the 'close' variable?

To store the 'checked' symbol

To store the input value

To store the newly created list item

To store the 'close' button elements (correct)

What is the outcome if the input value is empty when the 'Add' button is clicked?

An alert box is displayed with a message Signup and view all the answers

What is the purpose of the 'newElement' function?

To create a new list item when the 'Add' button is clicked Signup and view all the answers

What is the effect of clicking on a list item?

The 'checked' symbol is toggled Signup and view all the answers

What is the purpose of the 'myNodelist' variable?

To store the list items Signup and view all the answers

What is the event that triggers the creation of a new list item?

When the 'Add' button is clicked Signup and view all the answers

Match the JavaScript elements with their corresponding actions:

document.createElement("SPAN") = Creates a new span element document.createTextNode("\u00D7") = Creates a new text node document.getElementById("myInput") = Gets the input field element document.querySelector('ul') = Gets the unordered list element Signup and view all the answers

Match the variables with their corresponding uses:

myNodelist = Holds a list of LI elements close = Holds a list of close buttons list = Holds the unordered list element inputValue = Holds the value of the input field Signup and view all the answers

Match the event listeners with their corresponding actions:

onclick = Hides the current list item addEventListener('click' = Toggles the 'checked' class on a list item onkeydown = Creates a new list item ondblclick = Shows a confirmation message Signup and view all the answers

Match the methods with their corresponding actions:

appendChild = Adds a new element to the end of the list toggleClass = Toggles the 'checked' class on a list item createElement = Creates a new element style.display = Hides or shows an element Signup and view all the answers

Match the conditions with their corresponding outcomes:

inputValue === '' = An alert message is displayed inputValue !== '' = A new list item is created ev.target.tagName === 'LI' = The 'checked' class is toggled close[i].onclick === true = The list item is hidden Signup and view all the answers

Match the properties with their corresponding uses:

className = Sets the class name of an element tagName = Gets the tag name of an element value = Gets the value of an input field parentElement = Gets the parent element of an element Signup and view all the answers

Match the methods with their corresponding actions:

toggle = Toggles the 'checked' class on a list item appendChild = Adds a new element to the end of the list createElement = Creates a new element alert = Displays a confirmation message Signup and view all the answers

Match the variables with their corresponding values:

i = The index of the current element txt = The text node of the close button t = The text node of the list item ev = The event object of the click event Signup and view all the answers

Study Notes

Creating a To-Do List with JavaScript

A "close" button is created and appended to each list item using document.createElement("SPAN") and appendChild methods.
The "close" button is given the class "close" and the text content "\u00D7" (a multiplication sign).
When the "close" button is clicked, the parent element (the list item) is hidden using style.display = "none".

Managing List Items

A "checked" symbol is added to a list item when it is clicked using classList.toggle('checked').
The addEventListener method is used to listen for clicks on the unordered list (ul).

Adding New List Items

A new list item is created when the "Add" button is clicked using document.createElement("li").
The text content of the new list item is set to the value of the input field using document.createTextNode(inputValue).
The new list item is appended to the unordered list (ul) using appendChild.
A "close" button is also appended to the new list item using appendChild.
If the input field is empty, an alert is displayed prompting the user to enter a value.

Creating a To-Do List with JavaScript

A "close" button is created and appended to each list item using document.createElement("SPAN") and appendChild methods.
The "close" button is given the class "close" and the text content "\u00D7" (a multiplication sign).
When the "close" button is clicked, the parent element (the list item) is hidden using style.display = "none".

Managing List Items

A "checked" symbol is added to a list item when it is clicked using classList.toggle('checked').
The addEventListener method is used to listen for clicks on the unordered list (ul).

Adding New List Items

A new list item is created when the "Add" button is clicked using document.createElement("li").
The text content of the new list item is set to the value of the input field using document.createTextNode(inputValue).
The new list item is appended to the unordered list (ul) using appendChild.
A "close" button is also appended to the new list item using appendChild.
If the input field is empty, an alert is displayed prompting the user to enter a value.