Week 11

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Questions and Answers

What occurs when an element loses focus?

Change event

Load event

Focus event

Blur event (correct)

Which method is specifically associated with form submission?

change() Method

focus() Method

submit() Method (correct)

load() Method

When does the change event occur for select menus?

When the menu is opened

When the page is refreshed

When the value is set programmatically

When an option is selected (correct)

Which statement is incorrect regarding the change() method?

It's possible to attach a function using $(change).selector() Signup and view all the answers

What event occurs when the user navigates away from the page?

unload() method Signup and view all the answers

Which of the following is NOT a trigger for the unload event?

Scrolling within the page Signup and view all the answers

Which statement about the resize() method is false?

It triggers events for all elements regardless of their scroll status Signup and view all the answers

What is true about the scroll() method?

Triggers scroll events for all scrollable elements Signup and view all the answers

Which method is used to attach event handlers to selected elements?

on() method Signup and view all the answers

For text fields or text areas, when does the change event occur?

When the field loses focus after being changed Signup and view all the answers

What method is executed when the user clicks on an HTML element?

Click() Signup and view all the answers

Which mouse event method is called when any mouse button is pressed down over an HTML element?

Mousedown() Signup and view all the answers

Which method is used to detect when a mouse button is released over an HTML element?

Mouseup() Signup and view all the answers

What does the event.which property return?

The keyboard key or mouse button pressed for the event. Signup and view all the answers

Which keyboard event corresponds to the action of pressing a key down?

Keydown Signup and view all the answers

When the key is released, which keyboard event is initiated?

Keyup Signup and view all the answers

What is the correct syntax to trigger the key down event?

$('selector').keydown() Signup and view all the answers

Which syntax is used to handle the event when a key is released with a function attached?

$('selector').keyup(function) Signup and view all the answers

How can you assign a click event to all paragraphs on a page?

$('p').click(function(){ // action goes here!!}); Signup and view all the answers

Which method is typically used alongside the blur() method?

Focus() Signup and view all the answers

What is a characteristic of the unload event?

It can be triggered by closing the browser window. Signup and view all the answers

Which of the following statements about the resize event is accurate?

It triggers whenever the window or an element is resized. Signup and view all the answers

Which method is executed when a mouse button is released over an HTML element?

Mouse up Signup and view all the answers

What is not a correct characteristic of the change() method?

It only works on radio button elements. Signup and view all the answers

Which method allows for the attachment of multiple event handlers to selected elements?

on() method Signup and view all the answers

Which method would you use to attach a function that triggers on a key being pressed down?

keydown Signup and view all the answers

When does the blur() event typically occur?

When an element loses focus. Signup and view all the answers

What is the correct way to register a click event on all paragraphs using jQuery?

$('p').click(function() { // action goes here }); Signup and view all the answers

Which of the following is not a typical use case for the scroll() method?

Submitting a form when the page is scrolled. Signup and view all the answers

What event method is indicated for attaching a focus handler to an HTML element?

focus() Signup and view all the answers

For which scenario would you use the submit() method?

To handle form submission events. Signup and view all the answers

Which of the following is not a trigger for the change() event?

Closing the browser window. Signup and view all the answers

Which keyboard event is triggered when a key is released?

keyup Signup and view all the answers

What is the key difference between mousedown and mouseup events?

mousedown occurs when the mouse is over an element Signup and view all the answers

Which event occurs when the value of a text area is modified?

change event Signup and view all the answers

Which statement accurately describes the keypress event?

It triggers only for printable characters. Signup and view all the answers

When should you expect the unload event to be triggered during user interaction?

When the user clicks a link to navigate away. Signup and view all the answers

When a keyboard key is pressed, which method is used to define the action?

$('.selector').keypress(function() { }); Signup and view all the answers

Which mouse event is called when the mouse pointer is moved over an HTML element?

mouseover Signup and view all the answers

Study Notes

JavaScript Week 11 - Event Handlers

Method click(): Attaches an event handler to an HTML element, triggered when the user clicks on the element.
Method mousedown(): Attaches an event handler to an HTML element. This method is executed when the left, middle, or right mouse button is pressed down, while the mouse is positioned over the HTML element.
Method mouseup(): Attaches an event handler to an HTML element. This is triggered when the left, middle, or right mouse button is released, while the mouse is positioned over the HTML element.
event.which Property: Used to determine which key or mouse button was pressed during an event. Specifically returns the key or mouse button code.

JavaScript Events - Keyboard

keydown(): This event fires when a keyboard key is pressed down.
keypress(): This event fires in response to a key being pressed. It's often used for tracking character input beyond simple key presses.
keyup(): This event fires when a keyboard key is released.

JavaScript Events - Selecting Elements

$(selector).keydown() / $(selector).keyup() / $(selector).keypress(): Used to attach event handlers based on keyboard actions for selected HTML elements. Attaches these functions specifically to the selected HTML element.
$(selector).keydown(function) / $(selector).keyup(function) / $(selector).keypress(function): Similar to the previous methods, but includes a handler function to define actions executed when the event triggers. Attaches these event handler functions specifically to the selected HTML elements.

jQuery Methods - Mouse Events

focus(): Used primarily with input elements, focus() occurs when an element gains focus.
blur(): Often paired with focus(), blur() occurs when an element loses focus. Example: a user clicks away from a text field.
on(): A versatile method used to attach event handlers for various events, including clicks, key presses, and more. It's frequently employed for managing multiple event types on a single element or multiple elements.
click() function : Attaches a handler to an HTML element that executes when the HTML element is clicked (with a mouse). It's used for creating actions that happen only once.
submit() Method: This is associated with <form> elements and triggers when a form is submitted, typically after a user submits data by clicking a submit button.
change() method: This event fires when the value of an element is changed. Often associated with input fields, text areas, and select elements. Typically not used for elements like radio buttons or checkboxes directly for changing.
unload() method: This event is triggered when a document or page is unloaded or navigates away from.
resize() method: This event is triggered when the size of the browser window changes.
scroll() method: This occurs when a scrollable element is scrolled.

jQuery Event Syntax

.$(selector).action(function): This structure is fundamentally important in jQuery for attaching event handling. The action part refers specifically to the event type (click, submit, change, and so on).
$(selector).action() : A simple syntax often used to execute an action on the select elements (for example Click Button). Does not have a function applied.

Additional Notes

The on() method in jQuery is a generalized technique for handling many events across various elements.
These methods are key parts of JavaScript and are often used to add interactive functionalities to websites.

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Description

This quiz covers key concepts of event handling in JavaScript, including methods like 'click()', 'mousedown()', and 'mouseup()'. It also explores keyboard events such as 'keydown()', 'keypress()', and 'keyup()'. Test your knowledge on how to effectively manage user interactions through JavaScript events.