Week 11_Lesson 1
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Week 11_Lesson 1

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Questions and Answers

What happens when the mouse pointer enters an HTML element?

  • The mouseenter() method is executed. (correct)
  • The mouseup() method is executed.
  • The mouseleave() method is triggered.
  • The mousedown() method is executed.

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

  • mouseout()
  • mouseleave()
  • mousedown() (correct)
  • keyup()

    • What is the functionality of the hover() method in JQuery?

  • It combines mouseenter and mouseleave events. (correct)
  • It triggers the keydown event.
  • It listens for mouseup events.
  • It disables mouse events.

    • When does the keydown() method trigger an event?

    <p>When a keyboard key is pressed down.</p> Signup and view all the answers

    Which property is used to determine which keyboard key was pressed?

    <p>event.which</p> Signup and view all the answers

    What event is associated with the mouse pointer leaving an HTML element?

    <p>mouseleave()</p> Signup and view all the answers

    What is the result of using the event.which property during an event?

    <p>It identifies which key or mouse button was pressed.</p> Signup and view all the answers

    How does the mouseup() method function in relation to mouse events?

    <p>It executes when the mouse button is released.</p> Signup and view all the answers

    What does the keydown event signify in JavaScript?

    <p>The user is pressing down on a key.</p> Signup and view all the answers

    What will likely occur if an element has both mouseenter and mouseleave events attached?

    <p>Each event will function once as the mouse enters and leaves.</p> Signup and view all the answers

    What characterizes an event in jQuery?

    <p>It represents a user or browser action that a web page can respond to.</p> Signup and view all the answers

    Which method is commonly used to ensure jQuery code runs after the document is fully loaded?

    <p>ready()</p> Signup and view all the answers

    What does the click() method do in jQuery?

    <p>It attaches a function that executes on a single click of an element.</p> Signup and view all the answers

    Which of the following jQuery event methods is used to handle double-click actions?

    <p>dblclick()</p> Signup and view all the answers

    Why is it considered good practice to wait for the document to be fully loaded before executing jQuery code?

    <p>To make sure elements are available for selection.</p> Signup and view all the answers

    What is the purpose of passing a function to a jQuery event method?

    <p>To determine what happens when the event occurs.</p> Signup and view all the answers

    What does the function introduced in the jQuery ready() method signify?

    <p>It signifies that the document is fully loaded and scripts can safely run.</p> Signup and view all the answers

    In jQuery, how can you select all paragraph elements on a page to apply an event to them?

    <p>$('p')</p> Signup and view all the answers

    What is the primary purpose of the keydown() method in jQuery?

    <p>It sets the background color of an input field when a key is pressed down</p> Signup and view all the answers

    Which of the following statements about jQuery event methods is true?

    <p>Most DOM events have corresponding jQuery event methods.</p> Signup and view all the answers

    Which statement accurately describes the keyup() method?

    <p>It triggers actions upon the release of a key</p> Signup and view all the answers

    Which event is triggered when the user presses their mouse button down and releases it without moving the mouse?

    <p>click()</p> Signup and view all the answers

    Which keys do not fire the keypress event?

    <p>Shift and Control</p> Signup and view all the answers

    What does the key.which property return?

    <p>The key that was most recently pressed or released</p> Signup and view all the answers

    How is the keypress() event different from the keydown() event?

    <p>The keypress() event is only for letters and digits</p> Signup and view all the answers

    Which method is used to attach a function that runs when a specific keyboard event occurs?

    <p>keypress()</p> Signup and view all the answers

    What is the purpose of the dblclick() method?

    <p>To detect a double-click on an HTML element</p> Signup and view all the answers

    Which method is a combination of mouseenter() and mouseleave()?

    <p>hover()</p> Signup and view all the answers

    What action does the click() method perform in jQuery?

    <p>It attaches an event handler to an HTML element</p> Signup and view all the answers

    What event is fired when any keyboard key is pressed down?

    <p>keydown</p> Signup and view all the answers

    What is the purpose of the $(document).ready() method?

    <p>To ensure jQuery code runs after the document is fully loaded</p> Signup and view all the answers

    The click() method in jQuery can attach multiple event handlers to the same HTML element.

    <p>True</p> Signup and view all the answers

    What does the dblclick() method do in jQuery?

    <p>It attaches an event handler that triggers when an HTML element is double-clicked.</p> Signup and view all the answers

    The jQuery syntax is tailored for selecting HTML elements and performing _______ on them.

    <p>actions</p> Signup and view all the answers

    Match the jQuery methods with their actions:

    <p>click() = Attaches a click event handler dblclick() = Attaches a double-click event handler $(document).ready() = Executes code after the document is fully loaded hide() = Hides an HTML element</p> Signup and view all the answers

    Which of the following is a benefit of using jQuery event methods?

    <p>They streamline event handling for different user actions</p> Signup and view all the answers

    All jQuery methods execute immediately when the script is loaded.

    <p>False</p> Signup and view all the answers

    What type of actions can jQuery event methods respond to?

    <p>User actions such as clicks, double-clicks, keystrokes, etc.</p> Signup and view all the answers

    To assign an event to an HTML element in jQuery, you must pass a _______ to the event.

    <p>function</p> Signup and view all the answers

    Which of the following statements is true about events in jQuery?

    <p>Events are triggered by specific moments when user actions occur</p> Signup and view all the answers

    What happens when the mouse pointer enters an HTML element?

    <p>The function defined in mouseenter() is executed</p> Signup and view all the answers

    The mouseup() method is executed when the mouse pointer leaves the HTML element.

    <p>False</p> Signup and view all the answers

    What does the hover() method do in jQuery?

    <p>It combines mouseenter() and mouseleave() methods.</p> Signup and view all the answers

    The ______ method is used to detect when a keyboard key is pressed down.

    <p>keydown</p> Signup and view all the answers

    Match the following jQuery events with their functionality:

    <p>mouseenter() = Executed when mouse pointer enters an element mouseleave() = Executed when mouse pointer leaves an element mousedown() = Executed when any mouse button is pressed down mouseup() = Executed when any mouse button is released</p> Signup and view all the answers

    What method is used to execute a function when the mouse button is pressed down?

    <p>mousedown()</p> Signup and view all the answers

    The event.which property is used to determine which mouse button was clicked.

    <p>True</p> Signup and view all the answers

    What occurs when the hover() method is used with two functions?

    <p>The first function executes on mouse enter and the second on mouse leave.</p> Signup and view all the answers

    The ______ method is triggered by pressing a key on the keyboard.

    <p>keydown</p> Signup and view all the answers

    Which of the following methods is specific to mouse actions?

    <p>mouseenter()</p> Signup and view all the answers

    Which of the following methods is triggered when a keyboard key is released?

    <p>keyup()</p> Signup and view all the answers

    The keypress() method is fired for all keyboard keys including CTRL and ALT.

    <p>False</p> Signup and view all the answers

    What property is used to determine which key was pressed during a keyboard event?

    <p>event.which</p> Signup and view all the answers

    The __________ method attaches an event handler function to be executed when a key is pressed down.

    <p>keydown()</p> Signup and view all the answers

    Match the following keyboard methods with their descriptions:

    <p>keydown() = Triggered when a key is pressed down keyup() = Triggered when a key is released keypress() = Triggered when a character key is pressed event.which = Returns the key code of the pressed key</p> Signup and view all the answers

    Which of the following events is fired when a key is pressed down?

    <p>keydown</p> Signup and view all the answers

    The hover() method in jQuery is a combination of mouseenter() and keyup() methods.

    <p>False</p> Signup and view all the answers

    What is the distinct feature of the keypress event compared to keydown?

    <p>It is not fired for non-character keys.</p> Signup and view all the answers

    To count the number of key presses in a field, the __________ method should be used.

    <p>keypress()</p> Signup and view all the answers

    What is the purpose of the keyup() method?

    <p>Attach a function to run when a key is released</p> Signup and view all the answers

    Study Notes

    jQuery Event Methods

    • jQuery selects HTML elements and performs actions on them.
    • jQuery syntax is specially designed for selecting HTML elements and performing actions.
    • The $(document).ready() function ensures all jQuery code runs after the HTML document is fully loaded.

    jQuery Selectors

    • The $(selector) syntax targets specific HTML elements using various selectors:
      • $("#id"): Targets an element with the specified ID.
      • $(".class"): Targets all elements with the given class.
      • $("element"): Targets all elements of the specified type (e.g., $("p") targets all paragraphs).
      • $("*"): Targets all elements on the page.

    jQuery Events

    • Events represent actions that occur within a webpage, triggered by user interaction or system events.
    • jQuery provides methods for handling these events, simplifying event management.
    • Event handling allows webpage responsiveness to user actions.

    Common jQuery Event Methods

    • click(): Executes a function when an element is clicked.
    • dblclick(): Executes a function when an element is double-clicked.
    • mouseenter(): Executes a function when the mouse pointer enters an element.
    • mouseleave(): Executes a function when the mouse pointer leaves an element.
    • mousedown(): Executes a function when a mouse button is pressed down while the mouse is over an element.
    • mouseup(): Executes a function when a mouse button is released while the mouse is over an element.
    • hover(): Combines mouseenter() and mouseleave(), allowing for actions when the mouse enters or leaves an element.

    Keyboard Event Methods

    • Keyboard events represent actions related to keyboard keys.
    • event.which: A property within keyboard events that identifies the specific key pressed (e.g. event.which == 13 indicates the Enter key).
    • keydown(): Executes a function when a keyboard key is pressed down.
    • keyup(): Executes a function when a keyboard key is released.
    • keypress(): Executes a function when a key is pressed down. (Note: Not triggered for all keys, such as control keys.)

    Basic jQuery syntax

    • Selects HTML elements and performs actions on them.

    jQuery Selectors

    • Selectors are used to identify HTML elements in a webpage.
    • Common selectors:
      • #id: Selects by ID.
      • .class: Selects elements with the given class.
      • element: Selects elements of a given type.

    Common jQuery Events:

    • Click: User clicks on an element.
    • Double Click: User double-clicks on an element.
    • Mouse Enter: User moves mouse over an element.
    • Mouse Leave: User moves mouse away from an element.
    • Mouse Down: User presses mouse button while over an element.
    • Mouse Up: User releases mouse button while over an element.
    • Hover: A combination of mouseenter() and mouseleave().
    • Keydown: User presses a keyboard key.
    • Keyup: User releases a keyboard key.
    • Keypress: User presses a key, but not all keys (e.g. ALT, CTRL, SHIFT).

    jQuery Event Method Syntax:

    • Event methods are used to add functionality when events occur.
    • General syntax:
      • $(selector).eventMethod(function(){ //code to execute })
      • $(selector): Selects the element(s).
      • eventMethod: The specific event to listen for.
      • function(){ //code to execute }: The code to run when the event is triggered.

    Document Ready Event:

    • $(document).ready(function() { // code to execute });
    • Ensures jQuery code runs after the full HTML document is loaded.
    • Best practice to use this for all jQuery operations.

    Click Method:

    • $(selector).click(function(){ // code to execute });
    • Executes code when an element is clicked.

    Double Click Method:

    • $(selector).dblclick(function(){ // code to execute });
    • Executes code when an element is double-clicked.

    Mouse Enter Method:

    • $(selector).mouseenter(function(){ // code to execute });
    • Executes code when the mouse enters an element.

    Mouse Leave Method:

    • $(selector).mouseleave(function(){ // code to execute });
    • Executes code when the mouse leaves an element.

    Mouse Down Method:

    • $(selector).mousedown(function(){ // code to execute });
    • Executes code when a mouse button is pressed while over an element.

    Mouse Up Method:

    • $(selector).mouseup(function(){ // code to execute });
    • Executes code when a mouse button is released while over an element.

    Hover Method:

    • $(selector).hover(function(){ // code to execute on mouseenter }, function(){ // code to execute on mouseleave });
    • Executes different code when the mouse enters and leaves an element.

    Keyboard Event Methods:

    • event.which: Returns which keyboard key or mouse button was pressed.

    Key Down Method

    • $(selector).keydown(function(){ // code to execute });
    • Executes code when a key is pressed down.

    Key Up Method

    • $(selector).keyup(function(){ // code to execute });
    • Executes code when a key is released.

    Key Press Method

    • $(selector).keypress(function(){ // code to execute });
    • Executes code when a key is pressed, but not for all keys (e.g., ALT, CTRL, SHIFT).
    • Use keydown() to handle these cases.

    Common jQuery Event Method Summary:

    • Mouse Event Methods:
      • click()
      • dblclick()
      • mouseenter()
      • mouseleave()
      • mousedown()
      • mouseup()
      • hover()
    • Keyboard Event Methods:
      • keydown()
      • keyup()
      • keypress()

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